CN108629101A - A kind of rubber powder aggregate concrete optimum design method improving frost-proof test - Google Patents
A kind of rubber powder aggregate concrete optimum design method improving frost-proof test Download PDFInfo
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Abstract
The present invention relates to a kind of rubber powder aggregate concrete optimum design methods improving frost-proof test, rubber powder aggregate concrete is prepared using inner blending method, with rubber grain (rubber powder) volume according in the principle incorporation normal concrete of fine aggregate volume fixed percentage, corresponding fine aggregate is replaced in equal volume.Mass loss rate W is obtained based on fast freeze-thaw cyclic test datalWith freezing-thawing damage amount D two indexes changing rules, rubber powder grain size and volume are established with respect to optimum mix proportion, can be used for instructing mix Design in Practical Project.Obtained highly resistance freeze thawing durable rubber powder aggregate concrete has larger advantage in the case where reducing Frozen-thawed cycled in terms of mass loss and improvement freezing and thawing performance, in road and science of bridge building applied to the high freeze thawing sensibility area in the north, the pollution-free digestion process that waste rubber goods can be achieved achievees the purpose that save energy consumption, ensures adverse circumstances lower structure durability.
Description
Technical field
The invention belongs to road and technical field of bridge engineering, more particularly to a kind of rubber powder improving frost-proof test
Aggregate concrete optimum design method.
Background technology
In a natural environment for road engineering road surface and deck paving of concrete layer, especially the northern area of China easily by
To the influence of hot and cold alternation variation, Frozen-thawed cycled etc., pavement concrete soaks in the fall, freezed in winter, and spring melts, and freeze thawing follows
Ring carries out repeatedly, eventually leads to the durability damage of pavement structure, to seriously affect the use on road surface, reduces road surface
Service life.
The Basic Mechanism of concrete through freeze-thaw test is since concrete material composition is complex, and there are holes and fine fisssure for inside
The pore structures such as seam, when the pore structure of inside concrete is in water saturation state, temperature reduction can lead to concrete pore
In Free water setting expansion, generate expansive force, and then inside concrete caused to damage, work of the concrete in Frozen-thawed cycled
Under, the damage of internal frost heave can be accumulated gradually so that cracking occurs for concrete until damage.
With recycle in rubber powder partial alternative conventional concrete the cement base rubber powder that thick, fine aggregate is prepared gather materials it is mixed
Solidifying soil material, had not only alleviated the pressure that waste tire is brought to environment, but also can try hard to improve the performance of normal concrete, was collection ring
It protects with resource reutilization in the forward-looking innovation of one.It is durable that rubber powder mixes concrete meeting part change freeze thawing resistance
Property, common recognition is had reached from mechanism, but by the reciprocation of many factors, can be followed without unified standard at present, part test
As a result the not high or even opposite conclusion of improvement amplitude is also shown.
Invention content
In order to overcome the disadvantages of the above prior art, the purpose of the present invention is to provide a kind of raising frost-proof tests
Rubber powder aggregate concrete optimum design method is designed by the rubber powder grain size and volume of optimization, and decrease even is eliminated disadvantage
The influence of factor plays the grain size and volume combination advantage of rubber powder so that gained rubber powder aggregate concrete has to greatest extent
The effect for having highly resistance freeze-thaw durability, can be used for having the road of freeze-thaw damage hidden danger in science of bridge building relative configurations object.
To achieve the goals above, the technical solution adopted by the present invention is：
A kind of rubber powder aggregate concrete optimum design method improving frost-proof test, with rubber powder partial alternative base
Fine aggregate in quasi- concrete, the grain size and volume Optimum combinatorial design of rubber powder by fast freeze-thaw test mass loss rate WlWith
Freezing-thawing damage amount D is determined.
Wherein, quality change situation mass loss rate index WlCharacterization：
In formula：
Wl- mass loss rate；
W0The initial mass (kg) of-rubber powder aggregate concrete test specimen；
WnThe quality (kg) of rubber concrete test specimen after-n times Frozen-thawed cycled.
The change in physical such as dynamic modulus of elasticity situation is characterized with freezing-thawing damage figureofmerit D：
In formula：
ErConcrete relative dynamic elastic modulus after the freeze thawing of-n times；
E0、EnBefore-freeze thawing, after n times freeze thawing concrete dynamic modulus of elasticity (GPa).
According to application scenarios difference, it is not spiked with rubber powder in normal concrete, keeps normal concrete water, cement, thick bone
Material and water-reducing agent dosage are constant, combine the different-grain diameter and volume of rubber powder, by n times fast freeze-thaw cyclic test, obtain matter
Amount loss rate WlWith the optimum organization of freezing-thawing damage amount D minimums.
The ratio of mud 0.32；Rubber powder is not spiked in normal concrete, component proportioning is：Fine aggregate 757.0kg/m3；Thick bone
Expect 1090kg/m3；Water-reducing agent 9.57kg/m3；Water 144kg/m3；Cement 445kg/m3；The ratio of mud 0.32.Rubber powder volume according to
In the principle incorporation normal concrete of fine aggregate volume fixed percentage, in addition to rubber powder and fine aggregate, other components proportioning is：
Coarse aggregate 1090kg/m3；Water-reducing agent 9.57kg/m3；Water 144kg/m3；Cement 445kg/m3；The ratio of mud 0.32.Rubber powder volume
Respectively 10%, 20%, the 30% of fine aggregate volume, rubber powder grain size are respectively 80 mesh, 40 mesh, 20 mesh, carry out fast freeze-thaw
Composite test.
The basic step of the fast freeze-thaw cyclic test method is：
1) the four prisms cylinder freeze thawing resistance test specimen of making is shifted to an earlier date 4d according to 28d ages to take from standard curing room test specimen
Go out, is then immersed in 20 ± 2 DEG C of limewash and is terminated to curing age；
2) test specimen is taken out after impregnating and dries its surface moisture with wet cloth, is utilized respectively platform balance and resonance method concrete
The quality and dynamic modulus of elasticity of dynamic modulus of elasticity analyzer (resonance instrument) each test specimen of measurement are as its initial value；
3) test specimen is respectively charged into and is realized in ready rubber test piece box, and injected clear water to do not cross test specimen top surface 1~
3mm；
4) start fast freeze-thaw test, the time used of each Frozen-thawed cycled should control in 2~5h, every time for melting
Time should be greater than the 1/4 of the entire freeze thawing time.During entire Frozen-thawed cycled, the minimum temperature and highest at test specimen center
Temperature should remain at -18 DEG C ± 2 DEG C and 5 DEG C ± 2 DEG C, and during test specimen is endured cold and is melted, the temperature of test specimen is from 3
DEG C be reduced to -16 DEG C and be increased to from -16 DEG C 3 DEG C of transformation period should be greater than enduring cold or the thawing time 1/2, and test specimen is interior
The outer temperature difference should be controlled at 28 DEG C hereinafter, the conversion test specimen between test specimen freezing and thawing should control within 10min；
5) when reach the following conditions for the moment can stop testing：
1. freezing-thawing cycles reach 150 times；
2. declining 40% by the relative dynamic elastic modulus that lateral fundamental frequency is calculated；
3. the mass loss rate of test specimen reaches 5%；
6) test specimen is taken out every 25 Frozen-thawed cycleds during testing, rinses and dry its surface, carries out lateral fundamental frequency
With the measurement and record of quality.Test specimen is reloaded in test specimen box again, water filling simultaneously continues to test.
Compared with prior art, rubber powder aggregate concrete of the present invention mass loss and improvement in the case where reducing Frozen-thawed cycled is anti-
Freeze thawing aspect of performance has larger advantage, obtains the combination of its rubber powder Optimal Parameters for instructing match ratio in Practical Project to set
Meter has quite high engineering significance.Meanwhile being applied to the road and bridge work in the high freeze thawing sensibility area of northern China
Cheng Zhong can not only realize the pollution-free digestion process of waste rubber goods, solve shortage of resources and environmental pollution two large problems, and
And the excellent deformation behavior of rubber powder can be given full play to, reach and has ensured adverse circumstances lower structure frost-proof test
Purpose.
Description of the drawings
Fig. 1 is four prisms cylinder freeze thawing test specimen schematic diagram of the present invention.
Fig. 2 is mass loss rate W of the present inventionlChange curve.
Fig. 3 is freezing-thawing damage amount D change curves of the present invention.
Specific implementation mode
The invention specific implementation mode does not constitute the whole limitation to the scope of the invention, every in present inventive concept
Principle and spirit within, the improvement etc. of any modification, equivalent replacement that one of skill in the art makes should be included in this
Within the protection domain of invention.
Influence of the incorporation of recycling rubber powder for the frost-proof test of concrete material is by with three aspect positive actings
It is coupled to form with two aspect acting in oppositions.Wherein, positive acting is shown as：(1), the incorporation of rubber powder plays " solid bleed
Agent " acts on, as incorporation process can introduce a large amount of small " air bubbles " so that the air content in concrete increases.These
The presence of " air bubble " can be such that the pore water to suffer oppression penetrates into wherein, provide the draining space of pore water pressure, and contract
The short flow of pore water, alleviates hydrostatic pressure and osmotic pressure, to keep the freeze thawing resistance of rubber powder aggregate concrete durable
Property greatly improves；(2), the detrimental voids in the incorporation meeting partially filled concrete of rubber powder, to hinder the freedom in hole
Water condensation expands, and then enhances its frost-proof test energy；(3), rubber powder material itself is a kind of elastomer, in freeze thawing
It can play the role of buffering frost-heave force during cycle, to enhance the frost-proof test of rubber powder aggregate concrete
Energy.On the other hand, acting in opposition is shown as：(1), the incorporation of rubber powder can make the position that cement mortar is contacted with rubber powder
A weak boundary layer is generated, the presence of weak boundary layer not only reduces concrete crushing strength, also reduces simultaneously anti-
Freeze-thaw durability energy；(2), the influence degree that the various combination of both factors of rubber powder grain size Yu incorporation acts on other
It differs greatly, so as to cause the fluctuation of rubber powder aggregate concrete frost-proof test energy.
In general, the positive acting degree improved to rubber powder aggregate concrete frost-proof test is greater than reversed work
, but the grain size and volume combination advantage of rubber powder how are played to greatest extent, weaken the influence for even being eliminated disadvantage factor,
It is the key that solve the problems, such as.For this purpose, more excellent combination shape need to be sought by the way that rational evaluation index is arranged, and by special project experiment
Formula, it is as follows that the application designs embodiment.
Embodiment 1
Improve the rubber powder aggregate concrete optimum design method of frost-proof test, the particle size of the rubber powder of incorporation
For 80 mesh, volume 10%, fine aggregate 681.3kg/m3.Other components of rubber concrete, which match, is：Coarse aggregate 1090kg/m3；
Water-reducing agent 9.57kg/m3；Water 144kg/m3；Cement 445kg/m3；The ratio of mud 0.32.
Preparation method is as follows：The rubber powder for weighing formula ratio mixes according to fine aggregate volume fixed percentage and replaces phase
Volume fine aggregate is answered, then cement, water, coarse aggregate, the water-reducing agent etc. for putting into formula ratio, rubber powder is obtained after stirring and is gathered materials coagulation
Soil.Obtained rubber powder aggregate concrete is entered into molding and makees fast freeze-thaw test test specimen, size is 100mm × 100mm × 400mm
Four prisms cylinder, as shown in Figure 1.
Fast freeze-thaw cyclic test is carried out to rubber powder aggregate concrete test specimen, obtains quality under 0~150 Frozen-thawed cycled
The changing rule of loss late and freezing-thawing damage amount, mass loss rate W after Frozen-thawed cycled 50 times, 100 times and 150 timeslRespectively
0.067%, 0.135% and 0.169%；After Frozen-thawed cycled 50 times, 100 times and 150 times freezing-thawing damage amount D be respectively 0.017%,
0.053% and 0.095%.
Embodiment 2
It is a kind of improve frost-proof test rubber powder aggregate concrete optimum design method, it is different from embodiment 1 it
It is in the particle size of the rubber powder of incorporation is 80 mesh, volume 20%, fine aggregate 605.6kg/m3。
Fast freeze-thaw cyclic test is carried out with reference to embodiment 1, quality is damaged after obtaining Frozen-thawed cycled 50 times, 100 times and 150 times
Mistake rate WlRespectively 0.224%, 0.259% and 0.293%；Freezing-thawing damage amount D points after Frozen-thawed cycled 50 times, 100 times and 150 times
It Wei 0.017%, 0.035% and 0.050%.
Embodiment 3
It is a kind of improve frost-proof test rubber powder aggregate concrete optimum design method, it is different from embodiment 1 it
It is in the particle size of the rubber powder of incorporation is 80 mesh, volume 30%, fine aggregate 529.9kg/m3。
Fast freeze-thaw cyclic test is carried out with reference to embodiment 1, quality is damaged after obtaining Frozen-thawed cycled 50 times, 100 times and 150 times
Mistake rate WlRespectively 0.119%, 0.136% and 0.170%；Freezing-thawing damage amount D points after Frozen-thawed cycled 50 times, 100 times and 150 times
It Wei 0.032%, 0.078% and 0.124%.
Embodiment 4
It is a kind of improve frost-proof test rubber powder aggregate concrete optimum design method, it is different from embodiment 1 it
It is in the particle size of the rubber powder of incorporation is 40 mesh, volume 10%, fine aggregate 681.3kg/m3。
Fast freeze-thaw cyclic test is carried out with reference to embodiment 1, quality is damaged after obtaining Frozen-thawed cycled 50 times, 100 times and 150 times
Mistake rate WlRespectively 0.067%, 0.267% and 0.367%；Freezing-thawing damage amount D points after Frozen-thawed cycled 50 times, 100 times and 150 times
It Wei 0.026%, 0.071% and 0.146%.
Embodiment 5
It is a kind of improve frost-proof test rubber powder aggregate concrete optimum design method, it is different from embodiment 1 it
It is in the particle size of the rubber powder of incorporation is 40 mesh, volume 20%, fine aggregate 605.6kg/m3。
Fast freeze-thaw cyclic test is carried out with reference to embodiment 1, quality is damaged after obtaining Frozen-thawed cycled 50 times, 100 times and 150 times
Mistake rate WlRespectively 0.068%, 0.152% and 0.237%；Freezing-thawing damage amount D points after Frozen-thawed cycled 50 times, 100 times and 150 times
It Wei 0.022%, 0.046% and 0.088%.
Embodiment 6
It is a kind of improve frost-proof test rubber powder aggregate concrete optimum design method, it is different from embodiment 1 it
It is in the particle size of the rubber powder of incorporation is 40 mesh, volume 30%, fine aggregate 529.9kg/m3。
Fast freeze-thaw cyclic test is carried out with reference to embodiment 1, quality is damaged after obtaining Frozen-thawed cycled 50 times, 100 times and 150 times
Mistake rate WlRespectively 0.034%, 0.069% and 0.104%；Freezing-thawing damage amount D points after Frozen-thawed cycled 50 times, 100 times and 150 times
It Wei 0.005%, 0.013% and 0.030%.
Embodiment 7
It is a kind of improve frost-proof test rubber powder aggregate concrete optimum design method, it is different from embodiment 1 it
It is in the particle size of the rubber powder of incorporation is 20 mesh, volume 10%, fine aggregate 681.3kg/m3。
Fast freeze-thaw cyclic test is carried out with reference to embodiment 1, quality is damaged after obtaining Frozen-thawed cycled 50 times, 100 times and 150 times
Mistake rate WlRespectively 0.052%, 0.109% and 0.197%；Freezing-thawing damage amount D points after Frozen-thawed cycled 50 times, 100 times and 150 times
It Wei 0.008%, 0.034% and 0.046%.
Embodiment 8
It is a kind of improve frost-proof test rubber powder aggregate concrete optimum design method, it is different from embodiment 1 it
It is in the particle size of the rubber powder of incorporation is 20 mesh, volume 20%, fine aggregate 605.6kg/m3。
Fast freeze-thaw cyclic test is carried out with reference to embodiment 1, quality is damaged after obtaining Frozen-thawed cycled 50 times, 100 times and 150 times
Mistake rate WlRespectively 0.035%, 0.093% and 0.244%；Freezing-thawing damage amount D points after Frozen-thawed cycled 50 times, 100 times and 150 times
It Wei 0.004%, 0.012% and 0.025%.
Embodiment 9
It is a kind of improve frost-proof test rubber powder aggregate concrete optimum design method, it is different from embodiment 1 it
It is in the particle size of the rubber powder of incorporation is 20 mesh, volume 30%, fine aggregate 529.9kg/m3。
Fast freeze-thaw cyclic test is carried out with reference to embodiment 1, quality is damaged after obtaining Frozen-thawed cycled 50 times, 100 times and 150 times
Mistake rate WlRespectively 0.018%, 0.029% and 0.053%；Freezing-thawing damage amount D points after Frozen-thawed cycled 50 times, 100 times and 150 times
It Wei 0.003%, 0.006% and 0.015%.
Comparative example 1
A kind of reference cement base concrete material uses the identical ratio of mud with embodiment 1, the difference is that, it does not mix
Add rubber powder, fine aggregate 757.0kg/m3。
Fast freeze-thaw cyclic test is carried out with reference to embodiment 1, quality is damaged after obtaining Frozen-thawed cycled 50 times, 100 times and 150 times
Mistake rate WlRespectively 0.264%, 0.593% and 0.791%；Freezing-thawing damage amount D points after Frozen-thawed cycled 50 times, 100 times and 150 times
It Wei 0.038%, 0.098% and 0.168%.
The mass loss rate index W of 1~embodiment of embodiment 9 and the Frozen-thawed cycled test specimen of comparative example 1lWith Frozen-thawed cycled
Several changing rules is as shown in Figure 2.As can be seen that rubber concrete mass loss is one with the gradual increased mistake of Frozen-thawed cycled
The mass loss rate of journey, each embodiment and comparative example constantly increases with the increase of freezing-thawing cycles；Rubber powder gathers materials mixed
Solidifying soil property amount loss rate is generally less than normal concrete, and rubber powder improves the freezing and thawing performance of concrete, and is promoted more bright
It is aobvious.
1~embodiment of embodiment 9 and the freezing-thawing damage figureofmerit D of the Frozen-thawed cycled test specimen of comparative example 1 are secondary with Frozen-thawed cycled
Several changing rules is as shown in Figure 3.As can be seen that the freezing-thawing damage amount of rubber concrete is one with the variation of freezing-thawing cycles
A process for accelerating accumulation by a small margin, is consistent, the incorporation of rubber powder is to a certain extent with concrete Frozen-thawed cycled failure mechanism
The freezing-thawing damage amount for reducing concrete, that is, improve the freezing and thawing performance of concrete.
The influence of comprehensive analysis rubber powder grain size and volume to freezing and thawing performance, it is 30% to match that grain size, which takes 20 mesh, volume,
Composition and division in a proportion is the opposite optimum mix proportion recommended, and can guarantee excellent resist based on this rubber powder aggregate concrete material being prepared
Freeze thawing performance can be used for instructing same type material mix proportion optimization design.
It is contemplated that wideling popularize highly resistance freeze-thaw durability rubber in the road and science of bridge building with freeze-thaw damage hidden danger
Rubber powder gathers materials green ecological concrete material, certainly will have broad prospect of application and commercial application space.
Claims (5)
1. a kind of rubber powder aggregate concrete optimum design method improving frost-proof test, with rubber powder partial alternative benchmark
Fine aggregate in concrete, which is characterized in that the grain size and volume Optimum combinatorial design of rubber powder by fast freeze-thaw test quality
Loss late WlIt is determined with freezing-thawing damage amount D, whereinW0Indicate rubber powder aggregate concrete test specimen
Initial mass, WnThe quality of rubber concrete test specimen after expression n times Frozen-thawed cycled；ErIndicate n times freeze thawing
Concrete relative dynamic elastic modulus afterwards, E0The dynamic modulus of elasticity of concrete, E before expression freeze thawingnConcrete after expression n times freeze thawing
Dynamic modulus of elasticity keeps normal concrete water, cement, coarse aggregate and water-reducing agent dosage constant according to application scenarios difference, combination
The different-grain diameter and volume of rubber powder obtain mass loss rate W by n times fast freeze-thaw cyclic testlWith freezing-thawing damage amount D
Minimum optimum organization.
2. improving the rubber powder aggregate concrete optimum design method of frost-proof test, feature according to claim 1
It is, for rubber powder volume according in the principle incorporation normal concrete of fine aggregate volume fixed percentage, isometric replacement is corresponding
Fine aggregate, volume is respectively 10%, 20%, the 30% of fine aggregate volume, and rubber powder grain size is respectively 80 mesh, 40 mesh, 20 mesh,
It is combined experiment.
3. improving the rubber powder aggregate concrete optimum design method of frost-proof test, feature according to claim 1
It is, in rubber powder aggregate concrete material in addition to rubber powder and fine aggregate, other components proportioning is：Coarse aggregate 1090kg/m3；
Water-reducing agent 9.57kg/m3；Water 144kg/m3；Cement 445kg/m3；The ratio of mud 0.32；Rubber powder, group are not spiked in normal concrete
Part matches：Fine aggregate 757.0kg/m3；Coarse aggregate 1090kg/m3；Water-reducing agent 9.57kg/m3；Water 144kg/m3；Cement
445kg/m3；The ratio of mud 0.32.
4. improving the rubber powder aggregate concrete optimum design method of frost-proof test, feature according to claim 1
Be, in the fast freeze-thaw cyclic test, by the rubber powder aggregate concrete material of combination make 100mm × 100mm ×
The four prisms cylinder test specimen of 400mm.
5. improving the rubber powder aggregate concrete optimum design method of frost-proof test, feature according to claim 1
It is, the basic step of the fast freeze-thaw cyclic test method is：
1) the four prisms cylinder freeze thawing resistance test specimen of making is shifted to an earlier date 4d according to 28d ages to take out from standard curing room test specimen, so
It is immersed in 20 ± 2 DEG C of limewash and is terminated to curing age afterwards；
2) test specimen is taken out after impregnating and dries its surface moisture with wet cloth, is utilized respectively platform balance and resonance method concrete is moved
Property modulus tester measure each test specimen quality and dynamic modulus of elasticity as its initial value；
3) test specimen is respectively charged into and is realized in ready rubber test piece box, and injected clear water is not to crossing test specimen 1~3mm of top surface；
4) start fast freeze-thaw test, time used of each Frozen-thawed cycled should control in 2~5h, every time for thawing when
Between should be greater than the 1/4 of the entire freeze thawing time.During entire Frozen-thawed cycled, the minimum temperature and maximum temperature at test specimen center
- 18 DEG C ± 2 DEG C and 5 DEG C ± 2 DEG C should be remained at, during test specimen is endured cold and is melted, the temperature of test specimen is dropped from 3 DEG C
Be increased to as low as -16 DEG C and from -16 DEG C 3 DEG C of transformation period should be greater than enduring cold or the thawing time 1/2, and the inside and outside temperature of test specimen
Difference should be controlled at 28 DEG C hereinafter, the conversion test specimen between test specimen freezing and thawing should control within 10min；
5) when reach the following conditions for the moment can stop testing：
1. freezing-thawing cycles reach 150 times；
2. declining 40% by the relative dynamic elastic modulus that lateral fundamental frequency is calculated；
3. the mass loss rate of test specimen reaches 5%；
6) test specimen is taken out every 25 Frozen-thawed cycleds during testing, rinses and dry its surface, carries out lateral fundamental frequency and matter
The measurement and record of amount.Test specimen is reloaded in test specimen box again, water filling simultaneously continues to test.
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