CN101659527B - Modified aluminate low-alkali liquid quick-setting agent - Google Patents
Modified aluminate low-alkali liquid quick-setting agent Download PDFInfo
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- CN101659527B CN101659527B CN2009101834283A CN200910183428A CN101659527B CN 101659527 B CN101659527 B CN 101659527B CN 2009101834283 A CN2009101834283 A CN 2009101834283A CN 200910183428 A CN200910183428 A CN 200910183428A CN 101659527 B CN101659527 B CN 101659527B
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 47
- 150000004645 aluminates Chemical class 0.000 title claims abstract description 46
- 239000007788 liquid Substances 0.000 title claims abstract description 39
- 239000003513 alkali Substances 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- -1 alkali metal aluminate Chemical class 0.000 claims abstract description 21
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 19
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 14
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 14
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 12
- 150000008044 alkali metal hydroxides Chemical class 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 239000000126 substance Substances 0.000 claims description 22
- 238000002360 preparation method Methods 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims description 13
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 12
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical group [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 235000019353 potassium silicate Nutrition 0.000 claims description 7
- 235000017550 sodium carbonate Nutrition 0.000 claims description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 5
- 235000015320 potassium carbonate Nutrition 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 239000004567 concrete Substances 0.000 claims description 3
- 239000007858 starting material Substances 0.000 claims description 3
- 238000013019 agitation Methods 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 239000004568 cement Substances 0.000 abstract description 26
- 239000011378 shotcrete Substances 0.000 abstract description 12
- 238000010276 construction Methods 0.000 abstract description 4
- 238000002156 mixing Methods 0.000 abstract description 4
- 239000003607 modifier Substances 0.000 abstract 5
- 239000000243 solution Substances 0.000 description 41
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 15
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 229910052500 inorganic mineral Inorganic materials 0.000 description 6
- 239000011707 mineral Substances 0.000 description 6
- 235000010755 mineral Nutrition 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000004570 mortar (masonry) Substances 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 4
- 230000015271 coagulation Effects 0.000 description 4
- 238000005345 coagulation Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910001388 sodium aluminate Inorganic materials 0.000 description 3
- 229910003849 O-Si Inorganic materials 0.000 description 2
- 229910003872 O—Si Inorganic materials 0.000 description 2
- 229910002808 Si–O–Si Inorganic materials 0.000 description 2
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000001112 coagulating effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910002707 Al–O–H Inorganic materials 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910001569 aluminium mineral Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229940125717 barbiturate Drugs 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 description 1
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229920000592 inorganic polymer Polymers 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- KVOIJEARBNBHHP-UHFFFAOYSA-N potassium;oxido(oxo)alumane Chemical compound [K+].[O-][Al]=O KVOIJEARBNBHHP-UHFFFAOYSA-N 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 235000019976 tricalcium silicate Nutrition 0.000 description 1
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a modified aluminate low-alkali liquid quick-setting agent which is prepared by adopting the following steps: 1) preparing a modifier: preparing the modifier by the following raw materials according to the proportion by weight: 10-40% of silicate, 5-20% of carbonate and the balance of water; 2) preparing alkali metal aluminate solution as follows: preparing the alkali metal aluminate solution by the following raw materials according to the proportion: 20-35% of alkali metal hydroxide, 30-45% of aluminum hydroxide and the balance of water; and 3) preparing the quick-setting agent: adding the modifier prepared in the step 1) into the alkali metal aluminate solution prepared in the step 2) by the dripping way, and carrying out shear mixing, wherein, the proportion by weight of the modifier to the aluminate solution is 1:5.5-1:7, water needs to be added while dripping for dissolving a formed gel, and the adding amount of the water is 3.4-6 times of the weight of the modifier. The liquid quick-setting agent disclosed by the invention can particularly shorten the interval between initial setting time and final setting time, thereby having good adaptability to a variety of cement and being widely used in sprayed concrete construction.
Description
Technical field
The present invention relates to a kind of liquid accelerator that is used for sprayed concrete and mortar, this accelerating chemicals can be widely used in the construction of shotcrete of underground engineering constructions such as tunnel, mine, underground power house.
Background technology
Sprayed concrete has lot of superiority in underground construction and rock support, become extremely important and necessary measure in the modern underground works.Along with the development of wet-mix shotcrete technology, expanded the use range of sprayed concrete in underground works greatly.The most important effect of liquid accelerator for sprayed concrete is to accelerate condensing of concrete mix, improves early strength, can increase a jetting thickness like this and shortens and spray the pitch time of one deck down.
Liquid accelerator join in the sprayed concrete with cement in mineral hydration reaction fast takes place, cement is condensed at short notice, early strength increases rapidly.The action effect of accelerating chemicals and the mineral constituent in the cement and content have confidential relation, yet are subjected to all multifactor influences such as starting material, production technique, mineral composition obvious difference in the different cement.In China, can contain in the ordinary Portland cement and be not more than 20% nonactive adulterant, and the numerous cement adaptability of liquid accelerator that causes of adulterant kind is very outstanding, influences its use in sprayed concrete.
Traditional Liquid Aluminate Accelerating Additive component is single, mainly makes cement setting by the aquation that promotes the aluminium mineral material in the cement.Yet for the more cement of mineral admixture, because tricalcium aluminate content is relatively low, its short effect of coagulating is difficult to satisfy relevant requirement, therefore shows as inferior suitability, and range of application is restricted.In addition, aluminate accelerating chemicals alkali content (Na
2O+0.658K
2O) very high, generally greater than 15%, cause alkali-aggregate reaction easily, influence project durability.Reported a kind of liquid accelerator that is prepared from by potassium aluminate, salt of wormwood as U.S. Pat 4504345, this product alkali content surpasses 20%, and prices of raw and semifnished materials costlinesses such as potassium hydroxide, salt of wormwood, is unfavorable for that large-scale promotion uses.
Summary of the invention
The purpose of this invention is to provide a kind of modified aluminate liquid accelerator that can overcome above-mentioned technological deficiency, this liquid accelerator has short, characteristics such as alkali content is lower, cement adaptability is good time of coagulation.
In the aluminum oxide preparation field, the solution that contains silicate, carbonate aluminate can reduce the crystallization velocity of aluminium hydroxide, suppresses the hydrolysis reaction of aluminate solution, improves the stability of solution.This mainly is owing to silicate, carbonate can change the kenel of aluminium element in solution, exists network-like macroanion and Al-O-H that Al-O-Al is connected with Al-O-Si and Si-O-Si key in the siliceous sodium aluminate solution ... the Al hydrogen bond structure.And along with Al
2O
3And SiO
2Concentration increase network-like negatively charged ion and become many, become greatly, so the silicon-aluminum containing acid sodium solution is inorganic polymer solution rather than the supersaturated sodium aluminate solution thought in the past.And in the chemistry of cement field, Al-O-Si and Si-O-Si have very high reactive behavior, can chemical reaction take place rapidly with the mineral in the cement, thereby promote the aquation of cement.
The applicant finds after deliberation: compare with single aluminate accelerating chemicals, liquid sodium aluminate through persilicate, carbonate modification has the fabulous short performance of coagulating for cement slurry, especially can shorten the pitch time of initial set and final set, this characteristic is for improving the bonding very favourable of sprayed concrete and rock.This may be since silicate, the carbonate of introducing more help with cement slurry in mineral generation hydration reactions such as calcium hydroxide, tricalcium silicate, and traditional aluminate accelerating chemicals is just consuming gypsum, is promoting aspect such as aluminate aquation to play a major role.Help preventing aluminate generation hydrolysis reaction through the network molecular structure in the aluminate solution of modification simultaneously, can improve the package stability of liquid accelerator.
The applicant also finds after deliberation: the direct mixing with aluminate solution of the aqueous solution of silicate, carbonate can not be obtained stable solution system, in the blended process, because the variation of local silicon aluminum ratio, pH value can form gel, this gel is difficult to dissolving under the alr mode of routine.Yet, under the high-shear stirring condition, aluminate solution being joined in the mixing solutions of silicate, sodium aluminate in the mode that drips, formed at the beginning small amount of gel can be dissolved gradually, obtains clear soln again.
Above-mentioned high-shear agitation condition is the well-known technical qualification of a kind of chemical field, and available common mixing machine, homogenizer are realized.The basic definition of fluid shearing speed is velocity slope dv/dy, and its unit is the inverse (S of time
-1).
Based on above-mentioned research, the applicant proposes a kind of modified aluminate liquid accelerator, and this accelerating chemicals is prepared from by the following step:
1) preparation of properties-correcting agent
This properties-correcting agent is prepared from by weight proportion by following starting material: silicate, 10～40%; Carbonate, 5～20%; All the other are water;
2) preparation of alkali metal aluminate solution
This alkali metal aluminate solution is prepared from by following proportion of raw material: alkali metal hydroxide, 20～35%; Aluminium hydroxide, 30～45%; All the other are water;
3) allotment of accelerating chemicals
The properties-correcting agent that step 1) is made joins step 2 in the mode that drips) alkali metal aluminate solution that makes, and carry out high-shear and stir; The mass ratio of properties-correcting agent and aluminate solution is: 1: 5.5～1: 7; A spot of gel can appear in the starting stage that properties-correcting agent drips, and adds portion water and can quicken the agglomerative dissolving, and the add-on of water is 3.4～6 times of properties-correcting agent quality.
In the step 1), at first with dissolves carbonate in water, and then the heating condition under silicate is joined in the carbonate solution, form transparent solution.Optionally the silicates material is water glass, Starso or liquid soluble glass, preferred water glass.Optionally carbonate is yellow soda ash, salt of wormwood, preferred yellow soda ash.Heating temperature is 50～80 ℃, preferred 55～70 ℃.
Step 2) in, at first alkali metal hydroxide is dissolved in the water, under the condition of heating aluminium hydroxide is added wherein then, Heating temperature is 80～130 ℃, preferred 100～130 ℃.Reaction times is 2～8 hours, preferred 3～5 hours.Reaction vessel is a reactor of taking back the stream device.
Above-mentioned aluminium hydroxide is general industry aluminium hydroxide, preferred Al
2O
3＞63.5%, water ratio is less than 5% aluminium hydroxide.Selected alkali metal hydroxide is the alkali metal hydroxide of solubility, comprises sodium hydroxide, potassium hydroxide, preferred sodium hydroxide.
In the step 3), at first alkali metal aluminate is joined in the reactor, start high-shear mixer, stirring velocity is greater than 1000S
-1, then properties-correcting agent is added drop-wise in the reactor.The initial stage that properties-correcting agent drips gel can occur in the solution, and add the water of part this moment, and gel can dissolve gradually.Be added dropwise to complete the back and continued stirring reaction 30～120 minutes, form transparent and uniform solution and be low-alkaline liquid accelerating agent of the present invention.The whole process need of reaction carries out preferred 10～30 ℃ being lower than under 40 ℃ the temperature.The length that the dropping time of properties-correcting agent will try one's best, in order to avoid the gel that forms is difficult to dissolving, reasonably the dropping time is 20～60 minutes, preferred 30～50 minutes.
The present invention has following positive effect:
1, according to the experiment condition of JC477-2005 " sprayed concrete accelerating chemicals ", patent of the present invention promptly can make cement initial set within 4 minutes, final set within 10 minutes at (2%～5%) under the lower volume.
2, according to the test conditions of JC477-2005 " sprayed concrete accelerating chemicals ", more than 10Mpa, the intensity storage rate was greater than 80% in 28 days in the 1 day intensity that can make sand-cement slurry for patent of the present invention.
3, patent of the present invention provided contains silicate, carbonate low-alkali liquid quick-setting agent, has no irritating odor, and can bring good working environment, has good preservation stability under-5～35 ℃ temperature.
Embodiment
Following example more detailed description the preparation process of modified aluminate low-alkali liquid quick-setting agent of the present invention, but these examples never limit this scope of invention, if not separately in the following example of explanation the umber of quality all refer to mass parts.
Embodiment 1.
(1) preparation of aluminate properties-correcting agent
13.6 parts of yellow soda ash are dissolved in 59.2 parts of water, are heated to 60 ℃, add 27.2 parts of water glass, form transparent solution, obtain properties-correcting agent.
(2) preparation of alkali metal aluminate solution
In 35 parts of dissolution of sodium hydroxide to 30 part water, be heated to 120 ℃, add 45 parts of aluminium hydroxides, reaction 4h obtains alkali metal aluminate solution.
(3) preparation of accelerating chemicals
Above-mentioned aluminate solution is joined in the there-necked flask for 240 parts, open high-shear and stir, 40 parts of properties-correcting agent are joined in the dropping funnel, the dropping time was controlled at about 20 minutes.When gel occurring, 220 parts of water are joined in the flask.Be added dropwise to complete the back and continue reaction 1 hour.The clear solution of Xing Chenging is modified aluminate low-alkali liquid quick-setting agent at last.
Embodiment 2.
(1) preparation of aluminate properties-correcting agent
20 parts of yellow soda ash are added in 29 parts of water, be heated to 70 ℃, add 40 inclined to one side parts of water glass, form transparent solution, obtain properties-correcting agent.
(2) preparation of alkali metal aluminate solution
In 20 parts of dissolution of sodium hydroxide to 50 part water, be heated to 120 ℃, add 30 parts of aluminium hydroxides, reaction 3.5h obtains alkali metal aluminate solution.
(3) preparation of accelerating chemicals
Above-mentioned aluminate solution is joined in the there-necked flask for 250 parts, open high-shear and stir, 36 parts of properties-correcting agent are joined in the dropping funnel, the dropping time was controlled at about 30 minutes.When gel occurring, 214 parts of water are joined in the flask.Be added dropwise to complete the back and continue reaction 2 hours.The clear solution of Xing Chenging is the modified aluminate liquid accelerator at last.
Embodiment 3
(1) preparation of aluminate properties-correcting agent
5 parts of salt of wormwood are added in 75 parts of water, be heated to 70 ℃, add 20 parts of water glass, form transparent solution, obtain properties-correcting agent.
(2) alkali metal aluminate solution
In 20 parts of dissolution of sodium hydroxide to 54 part water, be heated to 120 ℃, add 26 parts of aluminium hydroxides, reaction 3.5h obtains alkali metal aluminate solution.
(3) preparation of accelerating chemicals
Above-mentioned aluminate solution is joined in the there-necked flask for 280 parts, open high-shear and stir, 50 parts of properties-correcting agent are joined in the dropping funnel, the dropping time was controlled at about 70 minutes.When gel occurring, 170 parts of water are joined in the flask.Be added dropwise to complete the back and continue reaction 1 hour.The clear solution of Xing Chenging is the modified aluminate liquid accelerator at last.
Embodiment 4
(1) preparation of aluminate properties-correcting agent
16 parts of yellow soda ash are added in 75 parts of water, be heated to 70 ℃, add 32 parts of water glass, form transparent solution, obtain properties-correcting agent.
(2) alkali metal aluminate solution
32 parts of potassium hydroxide are dissolved in 33 parts of water, are heated to 120 ℃, add 35 parts of aluminium hydroxides, reaction 3.5h obtains alkali metal aluminate solution.
(3) preparation of accelerating chemicals
Above-mentioned aluminate solution is joined in the there-necked flask for 260 parts, open high-shear and stir, 45 parts of properties-correcting agent are joined in the dropping funnel, the dropping time was controlled at about 45 minutes.When gel occurring, 180 parts of water are joined in the flask.Be added dropwise to complete the back and continue reaction 1 hour.The clear solution of Xing Chenging is the modified aluminate liquid accelerator at last.
Application example 1.
Cement paste test time of coagulation
Lafarge PO.42.5 cement 400
Water 160
Strength of cement mortar
Test Lafarge PO42.5 cement 900
Standard sand 1350
Water 450
Accelerating chemicals added in the cement slurry according to 3% of cement weight, and above-mentioned water consumption has comprised water contained in the liquid accelerator simultaneously.In the strength test, except testing 1 day intensity and 28 days intensity, do not carried out strength trial, be mixed with the mortar of accelerating chemicals and the ratio of its 28 days intensity in order to test to adding the blank mortar of any quick-hardening.Carried out the test of cement paste time of coagulation and mortar strength simultaneously with commercially available Liquid Aluminate Accelerating Additive.Test-results such as table 1 and table 2.
The effect of table 1. accelerating chemicals (I)
The effect of table 2. accelerating chemicals (II)
Use the modified aluminate low-alkali liquid quick-setting agent cement paste than aluminate accelerating chemicals certain shortening to be arranged time of coagulation as can be seen from table 1 and table 2, the interval of initial set and final setting time is shortened then more obvious; In addition, 28 days strength ratios of the mortar of liquid accelerator of the present invention and Liquid Aluminate Accelerating Additive also are significantly improved.
Application example 2
Carried out simultaneous test for the relatively poor several cement of conventional aluminium Barbiturates accelerating chemicals adaptability, test method is with example 1, and Comparative Examples is selected commercially available Liquid Aluminate Accelerating Additive, test-results such as table 3
Table 3. simultaneous test
As seen, modified aluminate low-alkali liquid quick-setting agent provided by the invention has better cement adaptability than traditional aluminate class accelerating chemicals.
Claims (8)
1. modified aluminate low-alkali liquid quick-setting agent is characterized in that adopting following steps to be prepared from:
1) preparation of properties-correcting agent
This properties-correcting agent is prepared from by weight proportion by following starting material: silicate, 10～40%; Carbonate, 5～20%; All the other are water; Its concrete preparation process is: at first with dissolves carbonate in water, be heated to 50～80 ℃, again silicate is joined in the carbonate solution, form transparent solution; Aforementioned silicate is selected from water glass, Starso or liquid soluble glass; Carbonate is selected from yellow soda ash or salt of wormwood;
2) preparation of alkali metal aluminate solution
This alkali metal aluminate solution is prepared from by following proportion of raw material: alkali metal hydroxide, 20～35%; Aluminium hydroxide, 30～45%; All the other are water;
3) allotment of accelerating chemicals
The properties-correcting agent that step 1) is made joins step 2 in the mode that drips) alkali metal aluminate solution that makes, and carry out shear agitation; The mass ratio of properties-correcting agent and aluminate solution is: 1: 5.5～1: 7; Need add entry during dropping, make the gel dissolving of formation, the add-on of water is 3.4～6 times of properties-correcting agent weight, and its concrete allocation process is:
At first alkali metal aluminate is joined in the reactor, greater than 1000S
-1Shear conditions under react, when gel occurring in the solution, when dripping properties-correcting agent, add water; Be added dropwise to complete the back and continued stirring reaction 30～120 minutes, promptly make finished product.
2. modified aluminate low-alkali liquid quick-setting agent according to claim 1 is characterized in that being heated in the step 1) 55～70 ℃.
3. modified aluminate low-alkali liquid quick-setting agent according to claim 1 is characterized in that step 2) at first alkali metal hydroxide is dissolved in the water, be heated to 80～150 ℃ then, again aluminium hydroxide is added wherein, reacted 2～8 hours.
4. as modified aluminate low-alkali liquid quick-setting agent as described in the claim 3, it is characterized in that step 2) in preferred 100～130 ℃ of Heating temperature, preferred 3～5 hours of reaction times.
5. as modified aluminate low-alkali liquid quick-setting agent as described in claim 1 or 3 or 4, it is characterized in that step 2) described in alkali metal hydroxide be the alkali metal hydroxide of solubility, Al in the described aluminium hydroxide
2O
3Content＞63.5%.
6. modified aluminate low-alkali liquid quick-setting agent according to claim 1 is characterized in that dripping in the step 3) preferred 30～50 minutes of time of properties-correcting agent.
7. as modified aluminate low-alkali liquid quick-setting agent as described in claim 1 or 6, the whole dropwise reaction process that it is characterized in that step 3) is carried out being lower than under 40 ℃ the temperature.
8. as modified aluminate low-alkali liquid quick-setting agent as described in claim 1 or 6, it is characterized in that preferred 10～30 ℃ of the drip reacting temperature of step 3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101834283A CN101659527B (en) | 2009-09-21 | 2009-09-21 | Modified aluminate low-alkali liquid quick-setting agent |
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| CN102219423B (en) * | 2011-04-20 | 2013-08-21 | 安徽中铁工程材料科技有限公司 | Method for preparing novel low-alkaline liquid setting accelerator |
| CN103819122A (en) * | 2014-01-24 | 2014-05-28 | 江西省交通工程集团公司 | Preparation method of low-alkaline liquid setting accelerator for sprayed concrete |
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| CN106630725B (en) * | 2016-12-01 | 2020-03-31 | 江苏苏博特新材料股份有限公司 | Liquid accelerator for sprayed concrete and preparation method thereof |
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| CN101659527A (en) | 2010-03-03 |
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