CN109608085B - Alkali aggregate reaction inhibitor - Google Patents
Alkali aggregate reaction inhibitor Download PDFInfo
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- CN109608085B CN109608085B CN201811620331.XA CN201811620331A CN109608085B CN 109608085 B CN109608085 B CN 109608085B CN 201811620331 A CN201811620331 A CN 201811620331A CN 109608085 B CN109608085 B CN 109608085B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/603—Agents for controlling alkali-aggregate reactions
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Abstract
The invention belongs to the field of concrete auxiliary materials, and particularly relates to an alkali aggregate reaction inhibitor. The inhibitor comprises components of quaternary ammonium salt, nonionic surfactant, rice hull ash, soybean meal, lactic acid and lithium carbonate, and the invention also discloses a preparation method of the inhibitor. The inhibitor provided by the invention is simple in preparation method, can effectively inhibit alkali aggregate reaction after being mixed with cement mortar, and is an economical and efficient alkali aggregate reaction inhibition technology.
Description
Technical Field
The invention belongs to the field of concrete auxiliary materials, and particularly relates to an alkali aggregate reaction inhibitor.
Background
In recent decades, concrete has become an essential part of human society as one of the most widely used building materials, which is the most used in various engineering structures. Moreover, with the increasing maturity and development of concrete technology, it is not only used in civil engineering structures such as houses, roads, bridges, etc., but also more and more used in hydraulic engineering, ocean engineering, and some special engineering structures. Originally, concrete structures were designed with an emphasis on meeting strength requirements, with strength being the standard for the life of the concrete structure. However, as the application range of concrete is getting wider and more complicated, environmental factors are getting more and more complex, and in order to satisfy the requirements of better exerting the functions of concrete structures in various environments, various novel concrete and additives such as high-strength ultrahigh-strength concrete, self-compacting concrete, green high-performance concrete and the like are rapidly developed. As concrete structures are becoming increasingly diversified and complicated, concrete construction techniques are mechanized and specialized, and concrete components are becoming more and more abundant, people have noticed that many concrete structures are subjected to various damages within their service life, and most of the damages are not caused by strength. Therefore, our country has made systematic research on concrete durability from the 80 th century, and it is proposed that a structure should be designed for durability. The durability of concrete refers to the performance of a concrete structure to maintain its working capacity under the action of natural environment, use environment and internal factors of materials. At present, the factors influencing the durability of the concrete structure mainly comprise: engineering structure leakage (erosion of acid-base salt solution), freeze-thaw cycle change, steel bar corrosion, concrete cracks, alkali-aggregate reaction and the like.
The Alkali-aggregate reaction (AAR) of concrete refers to a phenomenon in which Alkali in concrete chemically reacts with an aggregate having Alkali activity to cause volume expansion and cracking of concrete. Since Stanton discovered the concrete alkali-aggregate reaction in 1940, alkali-aggregate reaction destruction cases continue to appear in countries such as the United states Parker Dam, Canada Mactaquac hydroelectric station, Spain San Estaban Dam, and Indian Rihang Dam. Hundreds of dams are damaged by alkali-aggregate reaction of different degrees worldwide, and the alkali-aggregate reaction becomes an important cause of damage of the global concrete engineering, thereby causing attention of all countries in the world. The concrete alkali-aggregate reaction is a relatively slow process, sometimes requiring several years, more than ten years or even decades, and especially for some low-activity slow-expansion type active aggregates, the time is longer. The design service life of the hydraulic and hydroelectric engineering reaches hundreds of years, and the wet environment of the hydraulic concrete provides sufficient environmental conditions for alkali-aggregate reaction, so that the hydraulic concrete has higher potential risk of alkali-aggregate reaction than common concrete. Once the alkali-aggregate reaction occurs, the alkali-aggregate reaction is difficult to prevent, and the later repair is difficult to carry out, so that the engineering measures are taken in advance to prevent the concrete from generating the alkali-aggregate reaction damage, and the method plays an important role in ensuring the safe operation of the concrete engineering.
In order to find measures to suppress the harm of alkali-aggregate reaction, researchers have conducted various tests. By combining all experimental results, the current measures for preventing ASR mainly include using non-reactive aggregate, controlling the alkali content of concrete, reducing the humidity of the surrounding environment, using mixed materials or additives and the like. At present, the research on the alkali aggregate reaction is carried out from the research on a microscopic mechanism to the research on a macroscopic test, and the understanding of people on the alkali aggregate reaction is expanded from the doping of fly ash and silica fume to the doping of various chemical additives and active admixtures such as diatomite and zeolite, and certain measures are provided for preventing the alkali aggregate reaction in engineering, but the inhibition effect is not obvious.
Disclosure of Invention
In order to solve the problems, the invention provides an alkali aggregate inhibitor and a preparation method and application thereof. The alkali aggregate inhibitor has a good inhibition effect, and reduces the expansion rate of cement mortar.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
an alkali aggregate reaction inhibitor comprises the following components: quaternary ammonium salt, nonionic surfactant, rice hull ash, soybean meal, lactic acid and lithium carbonate.
Preferably, the weight percentage of each component in cement mortar is as follows: 0.01-1% of quaternary ammonium salt, 0.01-1% of nonionic surfactant, 3-8% of rice hull ash, 0.5-3% of soybean meal, 0.1-2% of lactic acid and 1-6% of lithium carbonate.
Preferably, the weight percentage of each component in cement mortar is as follows: 0.1-0.5% of quaternary ammonium salt, 0.1-0.5% of nonionic surfactant, 5-8% of rice hull ash, 0.5-1% of soybean meal, 0.2-1% of lactic acid and 2-5% of lithium carbonate.
Preferably, the nonionic surfactant is either or both of polyoxyethylene ether and polyvinyl alcohol.
More preferably, the nonionic surfactant is a mixture of polyoxyethylene ether and polyvinyl alcohol, and the mass ratio of the polyoxyethylene ether to the polyvinyl alcohol is as follows: 1: 1-3
Another object of the present invention is to provide a method for preparing an alkali-aggregate reaction inhibitor, comprising the steps of:
(1) preparation of rice husk ash: burning rice hulls, adding a grinding aid, and grinding the rice hull ash for later use;
(2) crushing the soybean meal, wherein the soybean meal is reserved;
(3) dissolving quaternary ammonium salt, nonionic surfactant and lactic acid in water to prepare aqueous solution, and preparing cement mortar by using the aqueous solution;
(4) mixing the rice hull ash obtained in the step (1) and the step (2), bean cake powder and lithium carbonate, and then sequentially adding the mixture into cement mortar;
preferably, the temperature rising rate during the rice husk burning in the step (1) is controlled to be 40-60 ℃/min, the highest temperature is 400-.
Preferably, the grinding aid in the step (1) is one or two of ethylene glycol and triethanolamine, and the dosage of the grinding aid is 0.01-0.1% of the rice hull ash.
Preferably, the grain size of the rice hull ash powder ground in the step (1) is 10-50 μm.
Preferably, the particle size of the soybean meal in the step (2) is 10-50 μm.
Preferably, the mass ratio of the quaternary ammonium salt to the nonionic surfactant in the step (3) is 1: 1-2.
The invention also aims to provide the application of the alkali-aggregate reaction inhibitor or the alkali-aggregate reaction inhibitor prepared by the preparation method in inhibiting the alkali-aggregate reaction.
Compared with the prior art, the invention has the main advantages that:
(1) the hydration product of the alkali-aggregate reaction and the surface of the aggregate are both negatively charged, and the addition of the quaternary ammonium salt can adsorb on the surface of the aggregate and has a repulsive effect on alkali, so that the combination and adsorption amount of the alkali on the surface of the aggregate is reduced, and the total amount of the effective alkali at the initial stage is increased. The presence of quaternary ammonium salt changes the distribution of alkali in the system, since the quaternary ammonium salt is adsorbed more on the surface of the aggregate when the hydration product is generated later. Along with the increase of age, the cement hydration is continuously carried out, the generation amount of hydration products is increased, alkali which is dissolved in cement minerals is gradually released, more alkali can be enriched on the surfaces of the hydration products due to the distribution difference of quaternary ammonium salts, and then the alkali is adsorbed and combined by gel in various physical and chemical forms, so that the harm of the alkali to alkali aggregate reaction is reduced.
(2) The polyoxyethylene ether and the polyvinyl alcohol are nonionic surfactants, can effectively disperse cement when added into mortar, have a dispersing effect on cement particles after added into a concrete mixture, and can improve the workability, reduce the unit water consumption and improve the fluidity of the concrete mixture. On the other hand, the amount of water used for mixing can be reduced, so that the alkali-aggregate reaction can be effectively inhibited in an early stage.
(3) The rice hull ash and the bean pulp have a synergistic effect, on one hand, the high-activity silicon dioxide in the rice hull ash can resist the bean pulp from caking, so that the bean pulp is uniformly dispersed in the cement mortar, and the protein in the bean pulp effectively complexes with alkali metal ions in the reaction of the alkali aggregate; on the other hand, the addition of the bean pulp and the rice hull ash can replace part of cement, improve the strength of concrete, adjust the water-cement ratio in the concrete, reduce the alkali content and reduce the alkali-aggregate reaction of the concrete.
(4) The addition of the nonionic surfactant, the quaternary ammonium salt and the lactic acid promotes the stability of the nonionic surfactant, the quaternary ammonium salt and the lactic acid in cement mortar, and the synergistic effect of the nonionic surfactant, the quaternary ammonium salt and the lactic acid better inhibits the reaction performance of alkali aggregate.
(5) The combined use of the rice hull ash, the bean pulp, the lactic acid and the lithium carbonate enhances the strength of the cement-based aggregate and the compressive and bending strength of the concrete on the one hand, and on the other hand, the synergistic effect of all the parts controls the reaction condition of the alkali aggregate, effectively inhibits the reaction of the alkali aggregate, and is added into cement mortar to form a high-performance concrete composite material.
Drawings
FIG. 1: a mortar expansion rate curve;
the invention will now be further illustrated with reference to the accompanying drawings and examples:
Detailed Description
Example 1
Preparing an alkali aggregate inhibitor and preparing cement mortar according to the following steps:
(1) preparation of rice husk ash: controlling the combustion of rice hulls in a combustion control box according to the conditions that the heating rate is 50 ℃/min, the highest temperature is 460 ℃ and the combustion is 20min, adding 0.06% glycol after the rice hulls are combusted, and grinding the rice hull ash particle size powder into 30 microns for later use;
(2) crushing the soybean meal to prepare soybean meal powder with the particle size of 30 microns for later use;
(3) dissolving 0.2% of quaternary ammonium salt, 0.2% of polyoxyethylene ether, 0.2% of polyvinyl alcohol and 0.5% of lactic acid in water to prepare an aqueous solution, and preparing cement mortar from the aqueous solution;
(4) 6% of rice hull ash, 0.8% of soybean meal powder and 4% of lithium carbonate are sequentially mixed into the cement mortar.
Example 2
Preparing an alkali aggregate inhibitor and preparing cement mortar according to the following steps:
(1) preparation of rice husk ash: controlling the combustion of rice hulls in a combustion control box according to the conditions that the heating rate is 40 ℃/min, the highest temperature is 500 ℃ and the combustion is carried out for 10min, adding 0.1 percent of glycol after the rice hulls are combusted, and grinding the rice hull ash particle size powder into 10 microns for later use;
(2) crushing the soybean meal to prepare soybean meal powder with the particle size of 10 microns for later use;
(3) dissolving 1% of quaternary ammonium salt, 0.25% of polyoxyethylene ether, 0.75% of polyvinyl alcohol and 0.1% of lactic acid in water to prepare an aqueous solution, and preparing cement mortar from the aqueous solution;
(4) the cement mortar is sequentially doped with 3% of rice hull ash, 5% of soybean meal powder and 1% of lithium carbonate.
Example 3
Preparing an alkali aggregate inhibitor and preparing cement mortar according to the following steps:
(1) preparation of rice husk ash: controlling the combustion of rice hulls in a combustion control box according to the conditions that the heating rate is 60 ℃/min, the highest temperature is 400 ℃ and the combustion is carried out for 30min, adding 0.01 percent of glycol after the rice hulls are combusted, and grinding the rice hull ash particle size powder into 50 microns for later use;
(2) crushing the soybean meal to prepare soybean meal powder with the particle size of 50 microns for later use;
(3) dissolving 0.01% of quaternary ammonium salt, 0.01% of polyvinyl alcohol and 2% of lactic acid in water to prepare an aqueous solution, and preparing cement mortar by using the aqueous solution;
(4) the cement mortar is sequentially mixed with 8% of rice hull ash, 0.3% of soybean meal powder and 1% of lithium carbonate.
Example 4
Preparing an alkali aggregate inhibitor and preparing cement mortar according to the following steps:
(1) preparation of rice husk ash: controlling the combustion of rice hulls in a combustion control box according to the conditions that the heating rate is 50 ℃/min, the highest temperature is 460 ℃ and the combustion is 20min, adding 0.05 percent triethanolamine after the rice hulls are combusted, and grinding the rice hull ash particle size powder into 40 microns for later use;
(2) crushing the soybean meal to prepare soybean meal powder with the particle size of 30 microns for later use;
(3) dissolving 0.1% of quaternary ammonium salt, 0.1% of polyoxyethylene ether and 0.2% of lactic acid in water to prepare an aqueous solution, and preparing cement mortar from the aqueous solution;
(4) the cement mortar is sequentially mixed with 8% of rice hull ash, 0.5% of soybean meal powder and 2% of lithium carbonate.
Example 5
Preparing an alkali aggregate inhibitor and preparing cement mortar according to the following steps:
(1) preparation of rice husk ash: controlling the combustion of the rice hulls in a combustion control box according to the conditions that the heating rate is 50 ℃/min, the highest temperature is 460 ℃ and the combustion is 20min, adding 0.02 percent of glycol and 0.03 percent of triethanolamine after the rice hulls are combusted, and grinding the rice hull ash particle size powder into 40 microns for later use;
(2) crushing the soybean meal to prepare soybean meal powder with the particle size of 30 microns for later use;
(3) dissolving 0.5% of quaternary ammonium salt, 0.2% of polyoxyethylene ether, 0.3% of polyvinyl alcohol and 1% of lactic acid in water to prepare an aqueous solution, and preparing cement mortar from the aqueous solution;
(4) 5% of rice hull ash, 1% of soybean meal powder and 5% of lithium carbonate are sequentially mixed into the cement mortar.
Comparative example 1 (variation of preparation conditions of Rice husk Ash)
Preparing an alkali aggregate inhibitor and preparing cement mortar according to the following steps:
(1) preparation of rice husk ash: controlling the combustion of rice hulls in a combustion control box according to the conditions that the heating rate is 20 ℃/min, the highest temperature is 300 ℃ and the combustion is 5min, adding 0.005 percent of glycol after the rice hulls are combusted, and grinding the rice hull ash particle size powder into 30 microns for later use;
(2) crushing the soybean meal to prepare soybean meal powder with the particle size of 30 microns for later use;
(3) dissolving 0.2% of quaternary ammonium salt, 0.2% of polyoxyethylene ether, 0.2% of polyvinyl alcohol and 0.5% of lactic acid in water to prepare an aqueous solution, and preparing cement mortar from the aqueous solution;
(4) 6% of rice hull ash, 0.8% of soybean meal powder and 4% of lithium carbonate are sequentially mixed into the cement mortar.
Comparative example 2 (variation of preparation conditions of Rice husk Ash)
Preparing an alkali aggregate inhibitor and preparing cement mortar according to the following steps:
(1) preparation of rice husk ash: controlling the combustion of rice hulls in a combustion control box according to the conditions that the heating rate is 70 ℃/min, the highest temperature is 700 ℃ and the combustion is 40min, adding 0.2 percent of glycol after the rice hulls are combusted, and grinding the rice hull ash particle size powder into powder
60 microns for later use;
(2) crushing the soybean meal to prepare soybean meal powder with the particle size of 30 microns for later use;
(3) dissolving 0.2% of quaternary ammonium salt, 0.2% of polyoxyethylene ether, 0.2% of polyvinyl alcohol and 0.5% of lactic acid in water to prepare an aqueous solution, and preparing cement mortar from the aqueous solution;
(4) 6% of rice hull ash, 0.8% of soybean meal powder and 4% of lithium carbonate are sequentially mixed into the cement mortar.
Comparative example 3 (raw material addition ratio change)
(1) Preparation of rice husk ash: controlling the combustion of rice hulls in a combustion control box according to the conditions that the heating rate is 50 ℃/min, the highest temperature is 460 ℃ and the combustion is 20min, adding 0.06% glycol after the rice hulls are combusted, and grinding the rice hull ash particle size powder into 30 microns for later use;
(2) crushing the soybean meal to prepare soybean meal powder with the particle size of 30 microns for later use;
(3) dissolving 0.009% quaternary ammonium salt, 1% polyoxyethylene ether, 1% polyvinyl alcohol and 3% lactic acid in water to prepare an aqueous solution, and preparing cement mortar from the aqueous solution;
(4) the cement mortar is sequentially mixed with 10% of rice hull ash, 0.4% of soybean meal powder and 0.5% of lithium carbonate.
Comparative example 4 (raw material addition ratio change)
(1) Preparation of rice husk ash: controlling the combustion of rice hulls in a combustion control box according to the conditions that the heating rate is 50 ℃/min, the highest temperature is 460 ℃ and the combustion is 20min, adding 0.06% glycol after the rice hulls are combusted, and grinding the rice hull ash particle size powder into 30 microns for later use;
(2) crushing the soybean meal to prepare soybean meal powder with the particle size of 60 microns for later use;
(3) dissolving 2% of quaternary ammonium salt, 0.004% of polyoxyethylene ether, 0.004% of polyvinyl alcohol and 0.05% of lactic acid in water to prepare aqueous solution, and preparing cement mortar by using the aqueous solution;
(4) 2% of rice hull ash, 4% of soybean meal powder and 7% of lithium carbonate are sequentially mixed into the cement mortar.
Comparative example 5 (No Rice husk Ash)
Preparing an alkali aggregate inhibitor and preparing cement mortar according to the following steps:
(1) crushing the soybean meal to prepare soybean meal powder with the particle size of 30 microns for later use;
(2) dissolving 0.2% of quaternary ammonium salt, 0.2% of polyoxyethylene ether, 0.2% of polyvinyl alcohol and 0.5% of lactic acid in water to prepare an aqueous solution, and preparing cement mortar from the aqueous solution;
(3) 0.8% of soybean meal powder and 4% of lithium carbonate are sequentially mixed into the cement mortar.
Comparative example 6 (without soybean meal)
Preparing an alkali aggregate inhibitor and preparing cement mortar according to the following steps:
(1) preparation of rice husk ash: controlling the combustion of rice hulls in a combustion control box according to the conditions that the heating rate is 50 ℃/min, the highest temperature is 460 ℃ and the combustion is 20min, adding 0.06% glycol after the rice hulls are combusted, and grinding the rice hull ash particle size powder into 30 microns for later use;
(2) crushing the soybean meal to prepare soybean meal powder with the particle size of 30 microns for later use;
(3) dissolving 0.2% of quaternary ammonium salt, 0.2% of polyoxyethylene ether and 0.2% of polyvinyl alcohol in water to prepare an aqueous solution, and preparing cement mortar from the aqueous solution;
(4) 6% of rice hull ash and 4% of lithium carbonate are sequentially mixed into the cement mortar.
Examples of effects
The effect of the alkali-aggregate reaction inhibitor of the present invention on the inhibition of alkali-aggregate reaction is described based on the mortar-bar rapid method.
The test method is specified in section 5.3 of DL/T5151-2014 of Hydraulic concrete aggregate test Specification and TB/T2922.5-2002 of aggregate alkali activity test method for railway concrete-speed-dependent mortar rod method. The size of the test piece is 25.4mm multiplied by 285mm, the curing temperature is 80 ℃, and the alkali supply mode is 1mol/L NaOH solution soaking curing. If the 14d expansion rate is less than 0.10 percent, the aggregate is non-reactive aggregate; if the 14d expansion rate is more than 0.20 percent, the aggregate is active aggregate with potentially hazardous reactions; if the 14d expansion rate is between 0.10% and 0.20%, the test observation time is prolonged to 28 d.
The test process comprises the following steps:
(1) the test mixing proportion is that the mass ratio of the cement to the sand is 1: 2.25. 400g of cement and 900g of sand are needed in total. The water-cement ratio of the mortar is 0.47.
(2) And (3) manufacturing a test piece, wherein the raw materials used for the test are placed in a constant temperature chamber with the temperature of 20 +/-2 ℃ and the relative humidity of more than 50% 24 hours before forming.
(3) Mortar preparation, cement mortars containing alkali aggregate inhibitors were prepared according to the materials of examples 1 to 5 and comparative examples 1 to 4, and cement mortars containing no alkali aggregate inhibitors were prepared.
(4) And (3) maintaining the test piece, wherein the maintenance temperature is 20 ℃, the relative humidity is 95%, demolding is carried out after the maintenance is carried out for 24 hours, and the initial length of the test piece is immediately tested in a standard maintenance room and is used as a reference value of the reference length.
(5) After the initial length of the test piece, the test piece is placed in a constant-temperature water bath box with the temperature of 80 ℃ and is kept at the constant temperature for 24 hours, then the length of the test piece is tested to be used as the reference length, and the test time is finished within the time of 15s +/-5 s.
(6) The test piece is put into a curing cylinder containing 1mol/L NaOH solution, and the test piece is completely soaked in the solution.
(7) The test specimen test ages are respectively 3d, 7d, 14d, 28d, 45d, 60d and 90 d.
As can be seen from FIG. 1, when the inhibitors of examples 1 to 5 were incorporated, the mortar expansion ratio of 14d was only 0.02 to 0.04%, and the mortar expansion ratio of 90d was 0.05 to 0.1%, and there was no risk of generation of alkali-aggregate reaction, and the alkali-aggregate reaction was effectively inhibited.
When the inhibitor of the comparative examples 1 to 4 is added, the expansion rate of the mortar of 14d is between 0.1 and 0.2 percent, wherein the expansion rate of the mortar containing the inhibitor of the comparative examples 1 to 2 is more than 0.2 percent above 90d, and the expansion rate of the mortar containing the inhibitor of the comparative examples 3 to 4 is more than 0.2 percent around 50 d; therefore, there is a certain risk of alkali-aggregate reaction. When the inhibitors of comparative examples 5-6 were incorporated, the mortar expansion ratios of 14d were all greater than 0.2%, which is a reactive aggregate with potentially hazardous reactions.
The mortar expansion rate of the inhibitor-free reactive aggregate 14d is 0.46%, which is obviously beyond the standard regulation requirements and is a reactive aggregate with potentially hazardous reactions.
The above detailed description is specific to one possible embodiment of the present invention, and the embodiment is not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention should be included in the technical scope of the present invention.
Claims (5)
1. An alkali aggregate reaction inhibitor comprises the following components: quaternary ammonium salt, nonionic surfactant, rice hull ash, soybean meal, lactic acid and lithium carbonate; the weight percentage of each component in cement mortar is as follows: 0.01-1% of quaternary ammonium salt, 0.01-1% of nonionic surfactant, 3-8% of rice hull ash, 0.5-3% of soybean meal, 0.1-2% of lactic acid and 1-6% of lithium carbonate;
the nonionic surfactant is one or two of polyoxyethylene ether and polyvinyl alcohol; the mass ratio of the quaternary ammonium salt to the nonionic surfactant is 1: 1-2;
the preparation process of the rice husk ash comprises the following steps: burning rice hulls, adding a grinding aid, and grinding the rice hull ash for later use; wherein the heating rate is controlled to be 40-60 ℃/min when the rice hulls are combusted, the highest temperature is 400-500 ℃, and the combustion is carried out for 10-30min at the highest temperature; the grinding aid is one or two of ethylene glycol and triethanolamine; the dosage of the grinding aid is 0.01-0.1% of the rice hull ash.
2. The alkali-aggregate reaction inhibitor as claimed in claim 1, wherein the components are used in percentage by weight of cement mortar: 0.1-0.5% of quaternary ammonium salt, 0.1-0.5% of nonionic surfactant, 5-8% of rice hull ash, 0.5-1% of soybean meal, 0.2-1% of lactic acid and 2-5% of lithium carbonate.
3. The method for formulating cement mortar with an alkali-aggregate reaction inhibitor according to claim 1, comprising the steps of:
(1) preparation of rice husk ash: burning rice hulls, adding a grinding aid, and grinding the rice hull ash for later use;
(2) crushing the soybean meal, wherein the soybean meal is reserved;
(3) dissolving quaternary ammonium salt, nonionic surfactant and lactic acid in water to prepare aqueous solution, and preparing cement mortar by using the aqueous solution;
(4) and (3) mixing the rice hull ash obtained in the step (1) and the step (2), the soybean meal powder and lithium carbonate, and then adding the mixture into cement mortar.
4. The method for formulating cement mortar with an alkali-aggregate reaction inhibitor as described in claim 3, wherein the particle size of the soybean meal in the step (2) is 10 to 50 μm.
5. Use of the alkali-aggregate reaction inhibitor according to any one of claims 1-2 for inhibiting alkali-aggregate reaction.
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| CN112939502A (en) * | 2021-03-09 | 2021-06-11 | 贵州宏信创达工程检测咨询有限公司 | Concrete alkali-aggregate reaction inhibitor based on industrial solid waste material and concrete |
| CN115340390B (en) * | 2022-07-14 | 2023-10-10 | 洛阳理工学院 | Preparation method of red mud-based baking-free high-strength clay brick alkali inhibitor |
| CN115490475B (en) * | 2022-09-19 | 2023-09-15 | 江苏金海宁新型建材科技有限公司 | Water permeable concrete resistant to ubiquity and alkalization and preparation method thereof |
| CN115872686A (en) * | 2022-11-29 | 2023-03-31 | 中建西部建设贵州有限公司 | Plate rock aggregate concrete |
| CN115611551B (en) * | 2022-12-16 | 2023-03-14 | 石家庄市长安育才建材有限公司 | Alkali aggregate composite inhibitor and preparation method thereof |
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| CN102584085A (en) * | 2012-03-05 | 2012-07-18 | 刘福战 | Special additive for inhibiting concrete alkali-aggregate reaction |
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