CN104964892B - A kind of assay method of haydite pressure water absorption rate and the method for the lower slump-loss of reduction haydite concrete pump pressure - Google Patents
A kind of assay method of haydite pressure water absorption rate and the method for the lower slump-loss of reduction haydite concrete pump pressure Download PDFInfo
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Abstract
A kind of method that the present invention discloses the assay method and the lower slump-loss of reduction haydite concrete pump pressure of haydite pressure water absorption rate, the method for proposing haydite pressure water absorption rate concept and being weighed jointly in water using sample is soaked in is measured, and give method of the mixing water surplus being adapted by the haydite pressure water absorption rate determination of measure to reduce haydite concrete slump-loss, the problem of can solving easily to cause mixed concrete slump loss increase due to the moisture content in a large amount of absorption and coagulation soil-cement slurries of haydite in transport and pumping procedure by the inventive method.
Description
Technical field
Control technology field is prepared the invention belongs to the detection method of working performance of concrete and haydite concrete, is related to one
The assay method of haydite pressure water absorption rate and pass through the haydite pressure water absorption rate of measure in kind of concrete and determine adaptable mix
Method of Shuifu County's allowance to reduce haydite concrete slump-loss.
Background technology
Haydite concrete is a kind of lightweight aggregate concrete, the inner structural features of light ceramic in fine and closely woven cellular micropore and
Do not connect each other.These micropores are due to that gas is wrapped formed by into shell, including open type hole and closing type hole.
Due to the loose and porous structure inside haydite, haydite concrete is delivered to during pouring template through pump pressure, the water in cement mortar
Under pressure（Generally when pressure is more than 0.5MPa）It can progress into haydite in enclosed type micropore, make enclosed type micro-
Hole is changed into opening micropore, therefore, and haydite is easily pressurized water suction, is caused due to the moisture content in a large amount of absorption and coagulations soil of haydite
Concrete slump loss increase, the significantly decline of mobility, so that haydite concrete is difficult pumping in work progress
Or frequently occur the situation of stifled pump.
Feasibility solution for this problem is there is no at present, during production and construction, technical staff's often root
Subjective judgement is carried out according to experience, using the methods of visual observations come the additive or water by estimating addition enhancing mobile performance
Surplus, man's activity is more, and error is big, and can not quantify, and due to lacking a kind of accurate, comprehensive solution, constrains
The pumping technology development of haydite concrete.
The content of the invention
There is provided a kind of survey of haydite pressure water absorption rate in concrete for the above-mentioned problems in the prior art by the present invention
Determine method and determine that adaptable mixing water surplus is collapsed to reduce haydite concrete by the haydite pressure water absorption rate of measure
The method of degree of falling loss, can be solved in transport and pumping procedure easily due to a large amount of absorption and coagulations of haydite by the inventive method
Moisture content in soil-cement slurry and the problem of cause mixed concrete slump loss increase.
The technical proposal for solving the technical problem of the invention is：
A kind of assay method of haydite pressure water absorption rate, it is characterised in that comprise the following steps：
1）Haydite sample to be measured is taken, is dried to constant weight, is weighed, obtain dry haydite sample mass m0；
2）Drying haydite sample after weighing is soaked in water, saturation is absorbed water under normal pressure, is subsequently placed in volume and fixes
Container in, add water to close to graduation mark, stand 20min, add water to full scale, weigh, obtain normal pressure absorb water to saturation haydite,
Water and container gross mass m1；
3）By step 2）The haydite that normal pressure absorbs water to saturation takes out from container, is soaked in again in water, adjusts to measure
Pressure, absorbs water to saturation, and haydite and water then are transferred into step 2）Same container in, add water to close to graduation mark, stand
20min, adds water to full scale, weighs, and obtains determining the haydite, water and container gross mass m for absorbing water to saturation under pressure2；
4）The haydite, water and container gross mass m that saturation is absorbed water under pressure will be determined2Subtract the pottery that normal pressure absorbs water to saturation
Grain, water and container gross mass m1, obtain determining the difference of haydite water suction gross mass and haydite water suction gross mass under normal pressure under pressure,
That is haydite water absorption under pressure mass M；
5）Calculate haydite pressure water absorption rate WY, calculating formula is WY=（ M/m0 ）×100%.
Step 1）In, described haydite, particle diameter preferably 5~10mm；
Step 1）In, described drying, preferably blast drier, 105 ± 5 DEG C of drying temperature.
Step 2）In, described soak time is 24 ± 2h.
Step 3）In, under haydite pressure absorb water, preferably in concrete pressure bleeding instrument carry out, pressure gage measuring range be 6~
10MPa。
Step 5）In, haydite pressure water absorption rate WYCalculating is accurate to 0.1%.
The assay method of described haydite pressure water absorption rate, ambient temperature range is 20 ± 2 DEG C during measure.
A kind of method for reducing the lower slump-loss of haydite concrete pump pressure, it is characterised in that comprise the following steps：
1）Determine haydite pressure water absorption rate：I pressure value P i is uniformly chosen in the range of 0~6MPa, i >=5 are determined respectively
Corresponding haydite pressure water absorption rate W under Pi pressureYi；
2）Haydite saturation pressure water absorption rate W is determined by secondary derived functionY0With the pressure of haydite water absorption under pressure saturation point
Value P0：By step 1）The haydite pressure water absorption rate W of measureYiTest pressure P is corresponded to respectivelyiSecondary derivation obtains second differential business,
That is △2wYi/△Pi 2, take second differential business △2wYi/△Pi 2Value between positive and negative values and be zero point, the corresponding examination of the point
Pressure is tested, the optimal test pressure value P of haydite water absorption under pressure saturation point is as characterized0, the corresponding haydite pressure water absorption rate of the point
As characterize the haydite saturation pressure water absorption rate w of haydite water absorption under pressure saturation pointY0, P0And wY0Tried to achieve with interpolation method；
3）Calculate and Shuifu County's allowance is used in haydite concrete, adjust concrete ratio of water to material：Unit of account volume haydite saturation pressure
Power water absorption mwf, calculating formula is mwf = ma·WY0, m in formulaaFor the haydite quality included in unit volume haydite concrete, if
It is unit volume haydite saturation pressure water absorption m to determine in unit volume haydite concrete with Shuifu County's allowancewf0.9~1.1 times, press
According to setting Shuifu County's allowance, the water material proportioning of adjustment haydite concrete adds mix water consumption, you can.
Step 1）In, described i values preferably 6~10；
Step 2）In, △2wYi/△Pi 2Value between positive and negative values and be zero point, i.e. haydite water absorption under pressure saturation point
Determination method be specially：
（1）wYiTo PiDerivation, first order derivative △ wYi/△PiWith pressure PiIncrease, first in the trend gradually increased, is arrived
Up to being peak-peak during flex point, then begin to drastically reduce；
（2）Haydite saturation pressure water absorption rate W is determined by secondary derived functionY0With the pressure of haydite water absorption under pressure saturation point
Value P0：wYiTo PiSecondary derivation, second derivative △2wYi/△Pi 2With pressure PiIncrease, first in the trend gradually increased, increases to
Maximum, starts to drastically reduce, and reaches flex point, and flex point is zero when being haydite water absorption under pressure saturation point, subsequent second derivative △2wYi/△Pi 2Switch to negative value；Go out second derivative △ with interpolation calculation2wYi/△Pi 2Corresponding sign haydite pressure is inhaled when being zero
The optimal test pressure value P of water saturation point0；In secondary derivation, second derivative △2wYi/△Pi 2Occur in flex point both sides obvious
Change from positive to negative, meanwhile, other positions also occur it is positive and negative alternately change, it is determined that during flex point, it is necessary to while meeting 2
Condition, condition 1：Find out second derivative △2wYi/△Pi 22 points of positive and negative alternately change extreme difference maximum；Condition 2：Two point intervals are right
The first order derivative △ w answeredYi/△PiFor maximum, i.e. haydite pressure water absorption rate wYiWith test pressure PiChange curve goes out in this place
Now obvious turnover, the interval that above-mentioned 2 conditions are met simultaneously is defined as including the interval of flex point；
（3）Provide flex point both sides △2wYi/△Pi 2The coordinate of two points changed from positive to negative is respectively（P1,△2wY1/△
P1 2）With（P2,△2wY2/△P2 2）, flex point（That is haydite water absorption under pressure saturation point）Coordinate be（P0,△2wY0/△P0 2）, wherein △2wY0/△P0 2=0, then, characterize the optimal test pressure value P of haydite water absorption under pressure saturation point0Calculation formula be P0 = （P1·
△2wY2/△P2 2- P2·△2wY1/△P1 2）/（△2wY2/△P2 2- △2wY1/△P1 2）；Provide flex point both sides △2wYi/△Pi 2
The coordinate of two points of change from positive to negative is（wY1,△2wY1/△P1 2）With（wY2,△2wY2/△P2 2）, flex point（That is haydite pressure
Power water suction saturation point）Coordinate be（wY0,△2wY0/△P0 2）, wherein △2wY0/△P0 2=0, then, characterize haydite water absorption under pressure
The haydite saturation pressure water absorption rate w of saturation pointY0Calculation formula be wY0=（wY1·△2wY2/△P2 2- wY2·△2wY1/△
P1 2）/（△2wY2/△P2 2- △2wY1/△P1 2）.
In the prior art only have water absorption rate assay method, for determine haydite pressure water absorption rate reliable method study compared with
Few, simple and practical complete method of testing does not have disclosure in existing literature material.The side of conventional measure haydite water absorption rate
Method is first to soak haydite to absorb water, and is then weighed and is dried, calculates the percentage of poor quality for accounting for haydite quality before and after drying,
As haydite water absorption rate.And haydite pressure water absorption rate refers to the performance that haydite further absorbs water under pressure, that is, make pottery
Grain makes the degree for the lipostomous water suction not absorbed water originally under pressure, and the water absorption rate after usual haydite is pressurized is greater than haydite
Water absorption rate under normal pressure.Conventional method is to be obtained by drying weighing mode under water absorption rate and haydite normal pressure after haydite is pressurized
Water absorption rate, the difference between the two is haydite pressure water absorption rate.It is of the invention innovative propose haydite pressure water absorption rate concept and its
Assay method, the inventive method is simple to operate, credible result degree high.Prior art is determining the loose porous shape materials such as haydite
During absorptivity, after sample water suction, taken out from water, and surface moisture is wiped with wet towel etc., then weighed, due to haydite
Surface open hole is more, and the moisture absorbed in haydite aperture during aforesaid operations has part loss, measurement result error
Greatly, dispersion height, standard deviation are larger, and minute is long.The inventive method does not take conventional drying weighing technique, but creates
Sample is soaked in the method weighed jointly in water by the use of new property, it is ensured that moisture is not lost in haydite open bore, effectively disappears
Except this operating error, the accuracy of measurement result is substantially increased, the testing standard deviation of measurement result is greatly reduced,
Substantially reduce minute.
It is found by experiment that：On the one hand, haydite is with the increase of pressure, and its pressure water absorption rate also gradually increases, pressure
To a certain extent, haydite pressure water absorption rate can reach a saturation value for increase, and the increased amplitude of institute, which can be reduced, not to be further added by even,
And the pressure water absorption rate saturation value of the haydite of different cultivars and density rating is also not quite similar；On the other hand, pumping construction
Pressure be as the case may be depending on, be not fixed value, but the pressure of pumping construction is often larger（Typically it is not less than 8MPa）,
If tested according to reality according to the pressure of actual pumping construction, not only test danger coefficient and increase, test period
It is longer, show that the optimal test pressure value for characterizing haydite pressure water absorption rate saturation value is pressed far below actual pumping by test of many times
Power, is usually no more than 4MPa；The innovative determination haydite pressure water absorption rate saturation value that proposes of the inventive method is tested with optimal
The determination method of pressure value, and the inventive method further provides for：Should be according to sign haydite pressure water absorption rate saturation value most
Good test pressure value determines haydite pressure water absorption rate.The injury of the personnel caused by excessive test pressure so both avoided, carried
The security of height experiment, shortens test period, also will not cause determined haydite pressure water absorption rate because test pressure is too small
Haydite pressure water absorption rate gap with actual pumping is excessive, it is ensured that the validity of measurement result.
The inventive method is on the basis of haydite pressure water absorption rate is determined it is further envisioned that haydite concrete is in pumping pressure
Under dehydration degree, and the dehydration degree of cement mortar is bigger, causes haydite concrete fluidity under pumping pressure（The slump）
Loss it is bigger, determined by determining haydite pressure water absorption rate pump haydite concrete mixing water allowance, adjust concrete
Ratio of water to material, makes haydite concrete fluidity under pumping pressure disclosure satisfy that pumping construction technical requirements.The inventive method is only led to
Cross and add part water consumption and can effectively prevent from being difficult caused by haydite compression water suction causes concrete slump loss increase
Pumping or frequently occur stifled pump the occurrence of, be not required to add additive, can Field adjustment, it is simple to operate, rapidly and efficiently,
Cost is low.After being adjusted using the inventive method, the stifled pump rate reduction about 70% of pumping haydite concrete, for preparing pumping haydite
The consumption of the fluidizing reagent of concrete reduces about 10%, it is possible to decrease cost is at least up to 12%.
Slump-loss under the assay method and reduction haydite concrete pump pressure of a kind of haydite pressure water absorption rate of the present invention
Method, relative to prior art, its advantage is：
1）A kind of assay method of haydite pressure water absorption rate in concrete, simple and quick, credible result degree are provided
Height, the method weighed jointly in water is soaked in using sample, effectively eliminates the operating error during weighing, it is ensured that result
Accuracy, measurement result group internal standard deviation is not more than the 7% of average value.
2）There is provided a kind of haydite pressure water absorption rate by measure reduces the side of the lower slump-loss of haydite concrete pump pressure
Method, only can effectively be prevented because haydite compression water suction causes concrete slump loss increase to cause by adding part water consumption
Be difficult pumping or frequently occur stifled pump the occurrence of, help to reduce the consumption of additive, can control haydite coagulation
Soil pumping before and after slump-loss be not more than 60mm, can Field adjustment, simple to operate, rapidly and efficiently, cost is low, maintains
Concrete properties and material quantity are constant, effectively avoid waste.
Brief description of the drawings
Fig. 1 reduces the side of the lower slump-loss of haydite concrete pump pressure for the present invention by determining haydite pressure water absorption rate
Method flow.
Embodiment
With reference to specific embodiment, technical solution of the present invention and beneficial effect are further illustrated.
Embodiment 1：The lower slump-loss of haydite concrete pump pressure is reduced by determining haydite pressure water absorption rate
Raw material is shale ceramisite concrete, and step is：
1）Determine haydite pressure water absorption rate：8 pressure value Ps are uniformly chosen in the range of 0~5MPa1~P8, it is followed successively by 1
MPa, 1.5 MPa, 2 MPa, 2.5 MPa, 3.5 MPa, 4 MPa, 4.5 MPa, 5MPa, P is determined respectively1~P8Correspondence under pressure
Haydite pressure water absorption rate WY1~WY8；
Step 1）The assay method of middle haydite pressure water absorption rate is：a）5~10mm of particle diameter haydites of book structure samples to be measured are taken, drum
105 ± 5 DEG C of dryings of wind drying machine weigh to constant weight, obtain dry haydite sample mass m0；b）By the drying haydite sample after weighing
It is soaked in water, soaks and absorb water to saturation under 24 ± 2h, normal pressure, in the container for being subsequently placed in volume fixation, add water to close to quarter
Line is spent, 20min is stood, adds water to full scale, weighs, obtains haydite, water and container gross mass m that normal pressure absorbs water to saturation1；c）Will
Step b）The haydite that normal pressure absorbs water to saturation takes out from container, is placed in concrete pressure bleeding instrument, and is soaked in water, pressure
Power table range is 6~10MPa, adjusts to pressure is determined, absorbs water to saturation, haydite and water then are transferred into step b）Same appearance
In device, add water to close to graduation mark, stand 20min, add water to full scale, weigh, obtain absorbing water to saturation under measure pressure
Haydite, water and container gross mass m2；d）The haydite, water and container gross mass m that saturation is absorbed water under pressure will be determined2Subtract normal pressure
Absorb water to the haydite, water and container gross mass m of saturation1, obtain determining haydite water suction gross mass under pressure and inhaled with haydite under normal pressure
The difference of water gross mass, i.e. haydite water absorption under pressure mass M；e）Calculate haydite pressure water absorption rate WY, calculating formula is WY=（ M/m0 ）
×100%.Haydite pressure water absorption rate WYCalculating is accurate to 0.1%.Ambient temperature range is 20 ± 2 DEG C during measure.
2）Haydite saturation pressure water absorption rate W is determined by secondary derived functionY0With the pressure of haydite water absorption under pressure saturation point
Value P0：By step 1）The haydite pressure water absorption rate W of measureY1~WY8Test pressure P is corresponded to respectively1~P8Secondary derivation obtains secondary
Differential business, i.e. △2wYi/△Pi 2, take second differential business △2wYi/△Pi 2Value between positive and negative values and be zero point, the point
Corresponding test pressure, as characterizes the optimal test pressure value P of haydite water absorption under pressure saturation point0, the corresponding haydite pressure of the point
Power water absorption rate is the haydite saturation pressure water absorption rate w for characterizing haydite water absorption under pressure saturation pointY0, P0And wY0Tried to achieve with interpolation method；
Step 2）In, △2wYi/△Pi 2Value between positive and negative values and be zero point, i.e. haydite water absorption under pressure saturation point
Determination method be specially：（1）wYiTo PiDerivation, first order derivative △ wYi/△PiWith pressure PiIncrease, first in gradually increasing
Trend, reach flex point when be peak-peak, then begin to drastically reduce；（2）wYiTo PiSecondary derivation, second derivative △2wYi/
△Pi 2With pressure PiIncrease, first in the trend gradually increased, increases to maximum, starts to drastically reduce, reach flex point, flex point is
It is zero during haydite water absorption under pressure saturation point, subsequent second derivative △2wYi/△Pi 2Switch to negative value；Go out secondary lead with interpolation calculation
Number △2wYi/△Pi 2The corresponding optimal test pressure value P for characterizing haydite water absorption under pressure saturation point when being zero0；In secondary derivation
When, second derivative △2wYi/△Pi 2Occur obvious change from positive to negative in flex point both sides, meanwhile, other positions also occur just
It is negative alternately to change, it is determined that during flex point, it is necessary to while meeting 2 conditions, condition 1：Find out second derivative △2wYi/△Pi 2It is positive and negative
Alternately change 2 points of extreme difference maximum；Condition 2：2 points of interval corresponding first order derivative △ wYi/△PiFor maximum, i.e. haydite pressure
Power water absorption rate wYiWith test pressure PiThere is obvious turnover in this place in change curve, the area of above-mentioned 2 conditions will be met simultaneously
Between be defined as including the interval of flex point；（3）Provide flex point both sides △2wYi/△Pi 2The coordinate minute of two points changed from positive to negative
It is not（P1,△2wY1/△P1 2）With（P2,△2wY2/△P2 2）, flex point（That is haydite water absorption under pressure saturation point）Coordinate be（P0,△2wY0/△P0 2）, wherein △2wY0/△P0 2=0, then, characterize the optimal test pressure value P of haydite water absorption under pressure saturation point0Meter
Calculation formula is P0 = （P1·△2wY2/△P2 2- P2·△2wY1/△P1 2）/（△2wY2/△P2 2- △2wY1/△P1 2）；Regulation is turned
Point both sides △2wYi/△Pi 2The coordinate of two points of change from positive to negative is（wY1,△2wY1/△P1 2）With（wY2,△2wY2/△
P2 2）, flex point（That is haydite water absorption under pressure saturation point）Coordinate be（wY0,△2wY0/△P0 2）, wherein △2wY0/△P0 2=0, then,
Characterize the haydite saturation pressure water absorption rate w of haydite water absorption under pressure saturation pointY0Calculation formula be wY0=（wY1·△2wY2/△
P2 2- wY2·△2wY1/△P1 2）/（△2wY2/△P2 2- △2wY1/△P1 2）.
3）Calculate and Shuifu County's allowance is used in haydite concrete, adjust concrete ratio of water to material：Unit of account volume haydite saturation pressure
Power water absorption mwf, calculating formula is mwf = ma·WY0, m in formulaaFor the haydite quality included in unit volume haydite concrete, if
It is unit volume haydite saturation pressure water absorption m to determine in unit volume haydite concrete with Shuifu County's allowancewf1.0 times, according to setting
Surely Shuifu County's allowance is used, the water material proportioning of adjustment haydite concrete adds mix water consumption, you can.
According to 1 MPa, 1.5 MPa, 2 MPa, 2.5 MPa, 3.5 MPa, 4 MPa, 4.5 MPa, 5MPa test pressures point
It is other to carrying out pressure water absorption rate experiment with a collection of haydites of book structure, result of the test is shown in Table 1.
Haydites of book structure pressure water absorption rate under the different pressures of table 1
With test pressure P increase, obtained haydite pressure water absorption rate w is detectedYGradually increase, when test pressure increase
During to more than 3.0MPa, haydite pressure water absorption rate increase amplitude flatten out it is slow, haydite pressure water absorption rate is secondary to test pressure
Derivation（That is △2wYi/△Pi 2）The extremely saturation point of knee of curve, i.e. water absorption under pressure when being zero, the experimental tests pressure is optimal examination
Pressure is tested, as shown in Table 1 haydite pressure water absorption rate wYSaturation point between 6.6% to 7.1%, △ wYi/△PiIt is in maximum,
Optimal test pressure P is in 3MPa between 3.5MPa, and the test pressure P for calculating the point through internal difference method is 3.1MPa, haydite pressure
Water absorption rate wYFor 6.7%.
LC7.5 pumps haydite concrete match ratio, and haydites of book structure density rating is 700kg/m3, it is shown in Table 2.
The LC7.5 of table 2 pumps haydite concrete match ratio
Increase mixing water surplus=haydites of book structure consumption × haydites of book structure pressure water absorption rate=470 × 6.7%
= 31.5kg/m3.It is 8.6% that known haydites of book structure 24h normal pressures, which inhale water saturated water absorption rate,.Adjustment match ratio is shown in Table 3.
The LC7.5 of table 3 pumps haydite concrete match ratio
As shown in Table 3：Using the inventive method（Consider that the mixing water of haydite water absorption under pressure is rich）The haydite of preparation is mixed
Slump-loss value after solidifying soil pumping（For 50mm）Less than after the haydite concrete pumping for not considering the preparation of haydite water absorption under pressure
Slump-loss value（For 110mm）, significantly, pumping is normal for slump-loss effect after reduction pumping；Using the inventive method（I.e.
Consider that the mixing water of haydite water absorption under pressure is rich）The haydite concrete additive usage of preparation（For 9.0kg/m3）Than not considering pottery
The haydite concrete additive usage that grain water absorption under pressure is prepared（For 10.6kg/m3）Reduce 1.6kg/m3, effect is notable.
Embodiment 2：The lower slump-loss of haydite concrete pump pressure is reduced by determining haydite pressure water absorption rate
Raw material is leca concrete, step be the same as Example 1：
According to 1 MPa, 1.5 MPa, 2 MPa, 2.5 MPa, 3.5 MPa, 4 MPa, 4.5 MPa, 5MPa test pressures point
It is other to carrying out pressure water absorption rate experiment with a collection of leca, result of the test is shown in Table 4.
Haydites of book structure pressure water absorption rate under the different pressures of table 4
With test pressure PiIncrease, detect obtained haydite pressure water absorption rate wYiGradually increase, when test pressure increases
Greatly to more than 2.5MPa when, haydite pressure water absorption rate increase amplitude flatten out it is slow, by haydite pressure water absorption rate to test pressure two
Secondary derivation（That is △2wYi/△Pi 2）The extremely saturation point of knee of curve, i.e. water absorption under pressure when being zero, the experimental tests pressure is optimal
Test pressure, as shown in Table 1 haydite pressure water absorption rate wYSaturation point between 8.1% to 9.3%, △ wYi/△PiIt is in maximum
Value, most adds test pressure PiIn 2.5MPa between 3MPa, the test pressure P for calculating the point through internal difference method is 2.6MPa, haydite
Pressure water absorption rate wYFor 8.4%.
LC7.5 pumps haydite concrete match ratio, and leca density rating is 400kg/m3, it is shown in Table 5.
The LC7.5 of table 5 pumps haydite concrete match ratio
Increase mixing water surplus=leca consumption × leca pressure water absorption rate=270 × 8.4%
= 22.7kg/m3.It is 5.3% that known leca 24h normal pressures, which inhale water saturated water absorption rate,.Adjustment match ratio is shown in Table 6.
The LC7.5 of table 6 pumps haydite concrete match ratio
As shown in Table 6：Using the inventive method（Consider that the mixing water of haydite water absorption under pressure is rich）The haydite of preparation is mixed
Slump-loss value after solidifying soil pumping（For 45mm）Less than after the haydite concrete pumping for not considering the preparation of haydite water absorption under pressure
Slump-loss value（For 110mm）, significantly, pumping is normal for slump-loss effect after reduction pumping；Using the inventive method（I.e.
Consider that the mixing water of haydite water absorption under pressure is rich）The haydite concrete additive usage of preparation（For 10.6kg/m3）Than not considering
The haydite concrete additive usage that haydite water absorption under pressure is prepared（For 12.6kg/m3）Reduce 2kg/m3, effect is notable.
Embodiment 3：Conventional method determines the Contrast on effect of haydite pressure water absorption rate with the inventive method
To carrying out pressure water absorption rate experiment with a collection of haydites of book structure, measure pressure is 3.0MPa（Measurement result is shown in Table 1）, point
Do not determine haydite pressure water absorption rate with the inventive method conventionally, the sample size of measure is 35 groups（The sample of measure
Quantity is not less than 3 groups）, the sample number that two methods are determined is occupied carry out statistics calculating respectively, compare its sample standard deviation.
1st, conventional method surveys the water absorption rate of haydite
（1）Specific method is：
The first step, determines the saturated water absorption W under haydite normal pressureG, take haydites of book structure sample about 3000g to be measured~
4000g, the drying haydite sample after weighing is soaked in 24 ± 2h in water, absorbed water at ambient pressure by 5~10mm of particle size range
Saturation, then dries suction water saturated haydite with wet towel the moisture content on haydite surface, weighs wet haydite quality for m1, Ran Houfang
105 ± 5 DEG C of dryings of inlet air drying machine weigh to constant weight, obtain dry haydite sample mass m01, calculate haydite water absorption rate WG, haydite
Water absorption rate WGCalculation formula is：WG= （m1- m01）/ m01× 100%, calculating is accurate to 0.1%；
Second step, determines the saturated water absorption W after haydite is pressurizedYG, take the haydite dried in the first step about 1500g~
2000g, is accurate to 1g, and 24h ± 2h is soaked in drinking water, will inhale the cylinder of water saturated haydite immigration concrete pressure bleeding instrument
In body container, and it is put into piston up to liquid level is less than below vessel port at about 30mm toward addition drinking water in cylinder body and installs
Pressure-flow study instrument, closes bleeding valve, and water and haydite are carried out being forced into regulation pressure values PiFor 3.0MPa（In pressure process not
Obtain gas leakage leak, pressurization value PiThe 90% of pressure gage measuring range is must not exceed, the pressure gauge that range ability is 6~10MPa is selected, surely
Determine 3min, then open bleeding valve and disassemble Pressure-flow study instrument, the haydite in Pressure-flow study instrument cylinder body is all taken out, with wet
The moisture content on towel haydite surface, weighs wet haydite quality for m2, 105 ± 5 DEG C of dryings of wind drying machine are then placed in constant weight,
Weigh, obtain dry haydite sample mass m02, weigh and be accurate to 1g, calculate the water absorption rate W after haydite is pressurizedG, after haydite is pressurized
Water absorption rate WYGCalculation formula is：WYG= （m2- m02）/ m02× 100%, calculating is accurate to 0.1%；
3rd step, calculates haydite pressure water absorption rate, haydite pressure water absorption rate wYCalculation formula is wY = WYG- WG, calculate
It is accurate to 0.1%.
（2）The sample size of measure is 35 groups, and the grain pressured bleeding sample number of measure is occupied and carries out statistics calculating, is shown in Table
7。
2nd, the inventive method surveys the water absorption rate of haydite
The step 1 of haydite method for measuring pressure water absorption rate be the same as Example 1）, the haydite pressured bleeding sample size of measure
For 35 groups, the sample number of measure is occupied and carries out statistics calculating, 7 are shown in Table.
3rd, the measure Contrast on effect analysis of two methods
Haydite pressure water absorption rate (%) statistical form that the two methods of table 7 are determined
As shown in Table 7：With the haydite of a collection of same kind, the haydite pressure water absorption rate average value conventionally determined
（For 5.6%）Will be less than the haydite pressure water absorption rate average value determined according to the inventive method（For 6.6%）, conventionally survey
Fixed haydite pressure water absorption rate sample standard deviation（For 1.4%, the 25.7% of average value is accounted for）Significantly larger than according to the inventive method
The haydite pressure water absorption rate sample standard deviation value of measure（For 0.3%, the 4.6% of average value is accounted for）, this is due to that haydite surface is opened
Discharge hole is more, and the moisture absorbed in haydite aperture during wet haydite to be taken out to progress drying course has part and is lost in, and causes to survey
Determine that resultant error is big, measured value is relatively low, dispersion is high, standard deviation is larger, the inventive method is innovative adopts for strong authentication
The method weighed jointly in water with sample is soaked in, is effectively guaranteed moisture in haydite open bore and is not lost in, and effectively eliminates
This operating error, substantially increases the accuracy of measurement result, greatly reduces the testing standard deviation of measurement result, and
And substantially reduce minute.
Claims (3)
1. a kind of method for reducing the lower slump-loss of haydite concrete pump pressure, it is characterised in that comprise the following steps：
1）Determine haydite pressure water absorption rate：I pressure value P i is uniformly chosen in the range of 0~6MPa, i >=5 determine Pi pressures respectively
Corresponding haydite pressure water absorption rate W under powerYi；
2）Haydite saturation pressure water absorption rate W is determined by secondary derived functionY0With the pressure value P of haydite water absorption under pressure saturation point0：
By step 1）The haydite pressure water absorption rate W of measureYiTest pressure P is corresponded to respectivelyiSecondary derivation obtains second differential business, i.e. △2WYi/△Pi 2, take second differential business △2WYi/△Pi 2Value between positive and negative values and be zero point, the point it is corresponding experiment pressure
Power, as characterizes the optimal test pressure value P of haydite water absorption under pressure saturation point0, the corresponding haydite pressure water absorption rate of the point is
Characterize the haydite saturation pressure water absorption rate W of haydite water absorption under pressure saturation pointY0, P0And WY0Tried to achieve with interpolation method；
3）Calculate and Shuifu County's allowance is used in haydite concrete, adjust concrete ratio of water to material：Unit of account volume haydite saturation pressure is inhaled
Water mwf, calculating formula is mwf = ma·WY0, m in formulaaFor the haydite quality included in unit volume haydite concrete, setting list
With Shuifu County's allowance it is unit volume haydite saturation pressure water absorption m in the volume haydite concrete of positionwf0.9~1.1 times, according to setting
Surely Shuifu County's allowance is used, the water material proportioning of adjustment haydite concrete adds mix water consumption, you can.
2. according to the method described in claim 1, it is characterised in that：Step 1）In, described i values are 6~10.
3. according to the method described in claim 1, it is characterised in that：Step 2）In, △2WYi/△Pi 2Value between positive and negative values it
Between and be zero point, i.e. the determination method of haydite water absorption under pressure saturation point is specially：
（1）WYiTo PiDerivation, first order derivative △ WYi/△PiWith pressure PiIncrease, first in the trend gradually increased, arrival is turned
It is peak-peak during point, then begins to drastically reduce；
（2）WYiTo PiSecondary derivation, second derivative △2WYi/△Pi 2With pressure PiIncrease, first in the trend gradually increased, increase
To maximum, start to drastically reduce, reach flex point, flex point is zero when being haydite water absorption under pressure saturation point, subsequent second derivative △2WYi/△Pi 2Switch to negative value；Go out second derivative △ with interpolation calculation2WYi/△Pi 2Corresponding sign haydite pressure is inhaled when being zero
The optimal test pressure value P of water saturation point0；In secondary derivation, second derivative △2WYi/△Pi 2Occur in flex point both sides obvious
Change from positive to negative, meanwhile, other positions also occur it is positive and negative alternately change, it is determined that during flex point, it is necessary to while meeting 2
Condition, condition 1：Find out second derivative △2WYi/△Pi 22 points of positive and negative alternately change extreme difference maximum；Condition 2：Two point intervals are right
The first order derivative △ W answeredYi/△PiFor maximum；That is haydite pressure water absorption rate WYiWith test pressure PiChange curve is at flex point
There is obvious turnover, the interval that above-mentioned 2 conditions are met simultaneously is defined as including to the interval of flex point；
（3）Provide flex point both sides △2WYi/△Pi 2The coordinate of two points changed from positive to negative is respectively（P1,△2WY1/△P1 2）
With（P2,△2WY2/△P2 2）, flex point（That is haydite water absorption under pressure saturation point）Coordinate be（P0,△2WY0/△P0 2）, wherein △2WY0/
△P0 2=0, then, characterize the optimal test pressure value P of haydite water absorption under pressure saturation point0Calculation formula be P0 = （P1·△2WY2/△P2 2- P2·△2WY1/△P1 2）/（△2WY2/△P2 2- △2WY1/△P1 2）；Provide flex point both sides △2WYi/△Pi 2By
The coordinate of two points just to negative change is（WY1,△2WY1/△P1 2）With（WY2,△2WY2/△P2 2）, flex point（That is haydite pressure
Absorb water saturation point）Coordinate be（WY0,△2WY0/△P0 2）, wherein △2WY0/△P0 2=0, then, characterize haydite water absorption under pressure and satisfy
With the haydite saturation pressure water absorption rate W of pointY0Calculation formula be WY0=（WY1·△2WY2/△P2 2- WY2·△2WY1/△P1 2）/
（△2WY2/△P2 2- △2WY1/△P1 2）.
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| CN107449710B (en) * | 2017-08-17 | 2019-10-01 | 华能澜沧江水电股份有限公司 | Test device for measuring water absorption of stacking materials under different pressure conditions |
| CN108507898B (en) * | 2018-06-11 | 2021-02-05 | 中国神华能源股份有限公司 | Method for measuring component proportion of ammonium nitrate fuel oil explosive by using saturated oil absorption rate of raw material |
| CN109946202B (en) * | 2019-04-19 | 2024-05-10 | 四川省劲腾环保建材有限公司 | Device for detecting water absorption rate in process of preparing expanded slag ceramsite |
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| CN112577898B (en) * | 2020-11-23 | 2023-05-30 | 中建商品混凝土有限公司 | Device and method for testing pressure water absorption ratio of lightweight aggregate |
| CN117686378B (en) * | 2024-02-02 | 2024-05-03 | 中国电建集团西北勘测设计研究院有限公司 | Method for measuring saturation surface dry water absorption rate of artificial fine aggregate |
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