CN117865609A - Cement-based material for inhibiting alkali aggregate expansion and preparation method thereof - Google Patents
Cement-based material for inhibiting alkali aggregate expansion and preparation method thereof Download PDFInfo
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- CN117865609A CN117865609A CN202410029825.XA CN202410029825A CN117865609A CN 117865609 A CN117865609 A CN 117865609A CN 202410029825 A CN202410029825 A CN 202410029825A CN 117865609 A CN117865609 A CN 117865609A
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- 239000004568 cement Substances 0.000 title claims abstract description 145
- 239000000463 material Substances 0.000 title claims abstract description 99
- 239000003513 alkali Substances 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 31
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000002910 solid waste Substances 0.000 claims abstract description 33
- 239000004576 sand Substances 0.000 claims abstract description 27
- 239000000843 powder Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000004575 stone Substances 0.000 claims abstract description 20
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 19
- 239000002699 waste material Substances 0.000 claims abstract description 19
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims description 2
- 125000005587 carbonate group Chemical group 0.000 claims description 2
- 239000003651 drinking water Substances 0.000 claims description 2
- 235000020188 drinking water Nutrition 0.000 claims description 2
- 239000011435 rock Substances 0.000 claims description 2
- 239000003469 silicate cement Substances 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 32
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000007787 solid Substances 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 33
- 230000000052 comparative effect Effects 0.000 description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 22
- 230000000694 effects Effects 0.000 description 12
- 238000002474 experimental method Methods 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 6
- 229910052910 alkali metal silicate Inorganic materials 0.000 description 5
- 239000004570 mortar (masonry) Substances 0.000 description 5
- 239000004567 concrete Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 239000013000 chemical inhibitor Substances 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- IIPYXGDZVMZOAP-UHFFFAOYSA-N lithium nitrate Chemical compound [Li+].[O-][N+]([O-])=O IIPYXGDZVMZOAP-UHFFFAOYSA-N 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- -1 admixture Substances 0.000 description 1
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 description 1
- 229910001626 barium chloride Inorganic materials 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
Abstract
The invention provides a cement-based material for inhibiting alkali aggregate expansion and a preparation method thereof, wherein water, cement and inert solid waste are uniformly stirred, then river sand is poured, and a water reducing agent is added while stirring until the mixture is uniformly stirred to obtain the cement-based material, wherein the mass ratio of the water, the cement, the river sand, the inert solid waste and the water reducing agent is (108-311): 254-675): 571-2025): 41-341: 0.02-1. Compared with the prior art, the preparation method of the invention does not damage the actual water-cement ratio (water-cement ratio=m) of the cement-based material Water and its preparation method /m Cement and its preparation method ) The waste stone powder is doped into the cement-based material in a large amount by adopting a mode of fixing the water-cement ratio, and alkali aggregate reaction is inhibited by improving means such as reducing the internal alkalinity, compacting microstructure, reducing porosity and the like of the cement-based material; the inert solid waste can be doped into cement-based materials in a large amount to reduce the consumption of cement, and has good economic and environmental benefits; the preparation method of the invention is simple, and does not need to be specific to inert solid wasteThe method is characterized by simple steps, low cost and suitability for popularization.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a cement-based material for inhibiting alkali aggregate expansion and a preparation method thereof.
Background
The alkali aggregate reaction of the cement-based material means that specific components in the aggregate are subjected to chemical reaction with alkali substances in cement, admixture, additive and the like in the cement-based material under certain conditions, so that the structure of the cement-based material expands, cracks and even damages the internal structure of the cement-based material, and is one of important factors for deteriorating the durability of the cement-based material.
Alkali-aggregate reactions can be generally classified into two categories depending on the active ingredients of the aggregates in the cement-based material: the alkali silicate reaction and the alkali carbonic acid reaction are mainly based on the alkali silicate reaction, wherein the alkali silicate reaction refers to the chemical reaction that alkali of cement-based materials reacts with active silicon dioxide in aggregate to generate alkali silicate gel, and the chemical equation is as follows:
SiO 2 +Na + (K + )+OH - →Na(K)–Si–H(gel)
current measures to prevent alkali silicate reaction mainly include: the alkali content of each component in the cement-based material is strictly controlled, such as low-alkali cement is used; high-activity mineral admixture such as fly ash, blast furnace slag, metakaolin, silica fume and the like is adopted; chemical inhibitors such as lithium nitrate, barium sulfate, barium chloride, and the like are employed.
However, low-alkali cement costs are high and, due to the commercialization of highly active mineral admixtures, the cost is gradually increasing, and the use of chemical inhibitors will introduce new deleterious ions (Cl) into the cement-based material - 、SO 4 2- Etc.), and is relatively costly.
Therefore, when the current cement-based material alkali aggregate reaction inhibition method is uncomfortable, it is particularly important to explore a new cement-based material alkali aggregate inhibition method.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a cement-based material that suppresses expansion of alkali aggregates, and a method for producing the same.
The invention provides a preparation method of a cement-based material for inhibiting alkali aggregate expansion, which has the characteristics that the preparation method comprises the following steps: pouring water, cement and inert solid waste into a stirrer, and uniformly stirring to obtain slurry; and secondly, pouring river sand into the slurry, and adding a water reducing agent while stirring until the mixture is uniformly stirred to obtain the cement-based material, wherein the mass ratio of water, cement, river sand, inert solid waste and the water reducing agent is (108-311): (254-675): (571-2025): (41-341): (0.02-1).
Wherein the mass ratio of water, cement, river sand, inert solid waste and water reducing agent is (162-207): (381-450): (857-1350): (61-227): (0.08-0.65).
The preparation method of the cement-based material for inhibiting alkali aggregate expansion provided by the invention can also have the following characteristics: wherein the water is daily drinking water.
The preparation method of the cement-based material for inhibiting alkali aggregate expansion provided by the invention can also have the following characteristics: wherein, the cement is ordinary Portland cement, and the cement grade is 42.5.
The preparation method of the cement-based material for inhibiting alkali aggregate expansion provided by the invention can also have the following characteristics: wherein the inert solid waste is waste stone powder, the average particle size of the inert solid waste is less than 1 mu m, and the median particle size is less than 5 mu m.
The preparation method of the cement-based material for inhibiting alkali aggregate expansion provided by the invention can also have the following characteristics: wherein the waste stone powder is carbonate rock powder, and the content of carbonate in the waste stone powder exceeds 90 percent.
The preparation method of the cement-based material for inhibiting alkali aggregate expansion provided by the invention can also have the following characteristics: wherein the river sand is middle sand with fineness modulus ranging from 2.3 to 3.0.
The preparation method of the cement-based material for inhibiting alkali aggregate expansion provided by the invention can also have the following characteristics: wherein the water reducer is a powder granular polycarboxylic acid high-efficiency water reducer.
The invention also provides a cement-based material for inhibiting alkali aggregate expansion, which has the following characteristics: the preparation method of the cement-based material for inhibiting the alkali aggregate expansion is adopted.
Effects and effects of the invention
According to the cement-based material for inhibiting the expansion of the alkali aggregate and the preparation method thereof, water, cement and inert solid waste are poured into a stirrer to be stirred uniformly to obtain slurry, then river sand is poured into the slurry, and a water reducing agent is added while stirring until the slurry is stirred uniformly to obtain the cement-based material, wherein the mass ratio of the water to the cement to the river sand to the inert solid waste to the water reducing agent is (108-311): 254-675): 571-2025): 41-341: 0.02-1.
According to the preparation method disclosed by the invention, the proportion of cement-based material components (water, cement and river sand) in the prior art is not changed, and waste stone powder with different doping amounts is doped into the cement-based material, so that the consumption of cement in the cement-based material can be effectively reduced, and the alkalinity in the internal environment of the cement-based material is further reduced, and the preparation method has a great positive effect on inhibiting the generation of alkali aggregate reaction; the waste stone powder is mixed into the cement-based material to form a cement-based material system of the multi-element aggregate, so that the compactness is higher, the microstructure of the cement-based material is compacted, the micro-stress in the cement-based material is improved, and the expansion effect generated by alkali aggregate reaction is inhibited; the invention can improve the microstructure of the cement-based material, reduce the porosity of the cement-based material and further reduce Na in the cement-based material pore solution by utilizing the nucleation effect, the filling effect and the dilution effect of the waste stone powder + 、K + The influence of the alkaline ions.
Compared with the prior art, the invention has the beneficial effects that: the preparation method is different from the traditional method, and does not damage the actual water-cement ratio of the cement-based material (water-cement ratio=m Water and its preparation method /m Cement and its preparation method ) The waste stone powder is doped into the cement-based material in a large amount by adopting a mode of fixing the water-cement ratio, and the generation of alkali aggregate reaction can be effectively inhibited by multi-angle and multi-layer improvement means such as reducing the internal alkalinity, compact microstructure, porosity and the like of the cement-based material; the inert solid waste can be doped into cement-based materials in a large amount, so that the consumption of cement is reduced, and obvious economic and environmental benefits are achieved; the preparation method is quite simple, does not need to carry out special treatment and processing on the inert solid waste, has simple test steps and lower cost, and is suitable for popularization and application.
Drawings
FIG. 1 is a graph showing the comparative results of the test of the expansion rate of the alkali-aggregate reaction 14d of the cement-based materials 1, 2, 3, 4 and 5 prepared in the comparative examples and examples one to four according to the present invention.
Detailed Description
In order to make the technical means, creation characteristics, achievement purposes and effects achieved by the present invention easy to understand, the following comparative examples and examples are described in detail with reference to the accompanying drawings as a cement-based material for suppressing expansion of alkali aggregates and a method for preparing the same.
Comparative example
This comparative example provides a method for preparing a cement-based material 1 without inert solid waste incorporated in the prior art for alkali-aggregate reaction experimental tests.
The preparation method of the cement-based material 1 without inert solid waste is used for the alkali-aggregate reaction experimental test in the prior art: adding water and cement into a stirrer, stirring uniformly, adding river sand into the stirrer, stirring uniformly, and preparing comparative mortar, pouring the comparative mortar into a mould, and solidifying to obtain the cement-based material 1 in the prior art, wherein the mass ratio of water to cement to river sand is 207:440:990, and the concrete is shown in the table A.
Example 1
This example provides a method for preparing a cement-based material 2 incorporating inert solid waste for alkali-aggregate reaction experimental testing.
The preparation method of the cement-based material 2 doped with the inert solid waste for alkali aggregate reaction experiment test comprises the following steps: adding water, cement and waste stone powder into a stirrer, stirring uniformly, adding river sand into the stirrer, adding a water reducing agent into the stirring process, stirring uniformly to prepare binary aggregate system mortar, pouring into a mould, solidifying to obtain the cement-based material 2 for inhibiting alkali aggregate expansion, wherein the mass ratio of the water, the cement, the waste stone powder, the river sand and the water reducing agent is 200:426:63:959:0.08, the mass ratio of the water, the cement and the river sand is kept unchanged in the embodiment and the comparative example, and the added waste stone powder replaces part of the water, the cement and the river sand in an equal volume manner, and the specific formula ratio of the added waste stone powder to the cement is shown in a table A.
< example two >
This example provides a method for preparing a cement-based material 3 incorporating inert solid waste for alkali-aggregate reaction experimental testing.
The preparation method of the cement-based material 3 doped with the inert solid waste for alkali aggregate reaction experiment test is the same as that in the first embodiment, and only the mass ratio is different, in the embodiment, the mass ratio of water, cement, waste stone powder, river sand and water reducer is 194:413:121:929:0.27, and the concrete is shown in table a.
Example III
This example provides a method for preparing a cement-based material 4 incorporating inert solid waste for alkali-aggregate reaction experimental testing.
The preparation method of the cement-based material 4 doped with the inert solid waste for alkali aggregate reaction experiment test is the same as that in the first embodiment, and only the mass ratio is different, in the embodiment, the mass ratio of water, cement, waste stone powder, river sand and water reducer is 188:400:176:900:0.42, and the concrete is shown in table a.
Example IV
This example provides a method for preparing a cement-based material 5 incorporating inert solid waste for alkali-aggregate reaction experimental testing.
The preparation method of the cement-based material 5 doped with the inert solid waste for alkali aggregate reaction experiment test is the same as that in the first embodiment, and only the mass ratio is different, in the embodiment, the mass ratio of water, cement, waste stone powder, river sand and water reducer is 179:381:224:857:0.65, and the concrete is shown in table a.
< test example >
This test example the cement-based materials 1 to 5 prepared in comparative example, example one to example four were each subjected to alkali-aggregate reaction experimental tests.
Alkali aggregate experimental method the experimental formulation is shown in Table A by referring to the rapid method of mortar rod in JGJ52-2006 Standard for quality and inspection method of Sand and stone for Portland Cement-based materials. The size of the formed test piece is 25mm multiplied by 280mm, the curing temperature is (80+/-2) DEG C, and the alkali solution is 1mol/L NaOH solution for soaking and curing. Test evaluation criteria: when the 14d expansion rate is less than 0.1%, no potential hazard can be judged; when the 14d expansion rate is more than 0.2%, the potential hazard can be judged; when the expansion rate of 14d is between 0.1% and 0.2%, the test and judgment should be carried out according to a mortar length method, and the expansion rate in a test piece should be calculated according to the following formula, and the expansion rate is accurate to 0.01%:
in the method, in the process of the invention,
ε t expansion rate (%) of test piece at t-day age;
L t -length of test piece at t days age (mm);
L 0 -the base length (mm) of the test piece;
delta-gauge head length (mm);
the average value of the expansion rates of the three test pieces was used as a measurement value of the expansion rate at a certain age.
In the comparative example, when the 14d expansion ratio of the cement-based material 1 was 0.041% and the 14d expansion ratio was less than 0.1% according to the test evaluation standard, it was judged that there was no potential hazard, as shown in table a.
In example one, the cement content in the cement-based material 2 was reduced by 3.2% compared with the cement-based material 1 of the comparative example, the 14d expansion ratio was 0.028% and was reduced by 31.71%, and when the 14d expansion ratio was less than 0.1% according to the test evaluation criteria, it was judged that there was no potential hazard, and the alkali aggregate reaction was suppressed compared with the cement-based material 1 of the comparative example, as shown in table a.
In example two, the cement content in the cement-based material 3 was reduced by 6.1% compared with the cement-based material 1 of the comparative example, the 14d expansion ratio was 0.025% and reduced by 39.02%, and when the 14d expansion ratio was less than 0.1% according to the test evaluation criteria, it was judged that there was no potential hazard, and the alkali-aggregate reaction was suppressed compared with the cement-based material 1 of the comparative example, as shown in table a.
In the third example, when the cement content in the cement-based material 4 was reduced by 9.1% compared with the cement-based material 1 of the comparative example, the 14d expansion ratio was 0.017% and was reduced by 58.54%, and the 14d expansion ratio was less than 0.1% according to the test evaluation criteria, it was judged that there was no potential hazard, and the alkali-aggregate reaction was suppressed compared with the cement-based material 1 of the comparative example, as shown in table a.
In example four, when the cement content in the cement-based material 5 was reduced by 13.4% and the 14d expansion ratio was 0.014% and 65.85% as compared with the cement-based material 1 of the comparative example, and the 14d expansion ratio was less than 0.1% according to the test evaluation criteria, it was judged that there was no potential hazard and the alkali-aggregate reaction was suppressed as compared with the cement-based material 1 of the comparative example, as shown in table a.
Fig. 1 is a comparative graph of the test results of the expansion rate of the alkali aggregate reaction 14d of the cement-based materials 1, 2, 3, 4 and 5 prepared in the comparative examples and the examples one to four according to the present invention, and as shown in fig. 1, in the comparative examples, the example one, the example two, the example three and the example four, the mass ratio of water, cement and river sand and the total feeding volume are maintained by adopting a comparative experiment mode, and the expansion rate of the prepared cement-based materials is sequentially reduced as the amount of the inert solid waste is sequentially increased, which indicates that the feeding of the inert solid waste can make the cement-based materials have the effect of inhibiting the expansion of the alkali aggregate within a certain limit.
Table a (mix ratio for alkali aggregate test and 14d expansion ratio):
effects and effects of the examples
According to the first to fourth embodiments, under the condition that the proportion of cement-based material components (water, cement and river sand) in the prior art is not changed, waste stone powder with different doping amounts is doped into the cement-based material, so that the consumption of cement in the cement-based material can be effectively reduced, and the alkalinity in the internal environment of the cement-based material is further reduced, and the method has a great positive effect on inhibiting the generation of alkali aggregate reaction; the inert solid waste can be doped into the cement-based material in a large amount, so that the consumption of cement is reduced, and meanwhile, the mechanical property and the durability of the cement-based material can be effectively improved, so that the method has remarkable economic and environmental benefits; the preparation method related to the embodiment is very simple, special treatment and processing of inert solid waste are not needed, the test steps are simple, the cost is low, and the method is suitable for popularization and application.
In the test examples, the total feeding volume is kept unchanged by carrying out the comparison experiments of the comparative example, the first embodiment, the second embodiment, the third embodiment and the fourth embodiment, and the 14d expansion rate of the prepared cement-based material is sequentially reduced along with the sequential increase of the addition amount of the inert solid waste, so that the cement-based material has better effect of inhibiting the expansion of the alkali aggregate by feeding the inert solid waste within a certain limit.
It will be understood by those skilled in the art that the present invention is not limited to the foregoing embodiments and test examples, which are described herein merely as illustrations of the principles of this invention, and that various changes and modifications may be made without departing from the spirit and scope of this invention, which are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A method for preparing a cement-based material that inhibits expansion of alkali aggregate, comprising the steps of:
pouring water, cement and inert solid waste into a stirrer, and uniformly stirring to obtain slurry;
pouring river sand into the slurry, adding a water reducing agent while stirring until the mixture is uniformly stirred to obtain a cement-based material,
wherein the mass ratio of water, cement, river sand, inert solid waste and water reducing agent is (108-311): (254-675): (571-2025): (41-341): (0.02-1).
2. The method for producing a cement-based material that suppresses expansion of alkali aggregates according to claim 1, wherein:
wherein the mass ratio of water, cement, river sand, inert solid waste and water reducing agent is (179-200): (381-440): (857-990): (63-224): (0.08-0.65).
3. The method for producing a cement-based material that suppresses expansion of alkali aggregates according to claim 1, wherein:
wherein the water is daily drinking water.
4. The method for producing a cement-based material that suppresses expansion of alkali aggregates according to claim 1, wherein:
wherein the cement is ordinary silicate cement, and the cement grade is 42.5.
5. The method for producing a cement-based material that suppresses expansion of alkali aggregates according to claim 1, wherein:
wherein the inert solid waste is waste stone powder, the average particle size of the inert solid waste is less than 1 mu m, and the median particle size is less than 5 mu m.
6. The method for producing a cement-based material that suppresses expansion of alkali aggregates according to claim 5, wherein:
wherein the waste stone powder is carbonate rock powder, and the content of carbonate in the waste stone powder is more than 90%.
7. The method for producing a cement-based material that suppresses expansion of alkali aggregates according to claim 1, wherein:
wherein the river sand is middle sand with fineness modulus ranging from 2.3 to 3.0.
8. The method for producing a cement-based material that suppresses expansion of alkali aggregates according to claim 1, wherein:
wherein the water reducer is a powder granular polycarboxylic acid high-efficiency water reducer.
9. A cement-based material that inhibits expansion of alkali aggregate, characterized in that: the cement-based material prepared by the preparation method for inhibiting alkali aggregate expansion according to any one of claims 1 to 8.
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