阅读说明：本技术 一种抑制水泥基材料收缩的试剂 (Agent for inhibiting shrinkage of cement-based material ) 是由 张鑫 贾虎琛 任鹏飞 于 2020-06-11 设计创作，主要内容包括：本发明属于建筑材料添加剂制作的技术领域,具体涉及一种抑制水泥基材料收缩的试剂,所述试剂的制作方法,包括如下步骤：1)将柚子皮粉和水混合后装入容器中得悬浮液,再向容器中加入碱性蛋白酶/羧酸还原酶复合酶进行酶解；2)待上述酶解结束后,脱水干燥得固形物,向固形物中加入溶剂、催化剂,在微波辐照下升温至85-90℃,保温辐照20-30min；3)将步骤2)所得物置于紫外线照射下,加入二苯甲酮、月桂基葡糖苷,搅拌10-15min；4)将步骤3)所得物与废弃食用油真空搅拌5-10min后,再加入锰矿渣真空搅拌,即得。(The invention belongs to the technical field of manufacturing of building material additives, and particularly relates to a reagent for inhibiting the shrinkage of a cement-based material, wherein a manufacturing method of the reagent comprises the following steps: 1) mixing the shaddock peel powder and water, putting the mixture into a container to obtain a suspension, and adding an alkaline protease/carboxylic acid reductase complex enzyme into the container for enzymolysis; 2) after the enzymolysis is finished, dehydrating and drying to obtain a solid matter, adding a solvent and a catalyst into the solid matter, heating to 85-90 ℃ under microwave irradiation, and keeping the temperature and irradiating for 20-30 min; 3) placing the product obtained in step 2) under ultraviolet irradiation, adding benzophenone and lauryl glucoside, and stirring for 10-15 min; 4) and (3) stirring the obtained product in the step 3) and the waste edible oil in vacuum for 5-10min, and then adding the manganese slag in vacuum and stirring to obtain the manganese-containing mineral.)

1. An agent for inhibiting shrinkage of a cement-based material, the agent being produced by a method comprising the steps of:

1) weighing shaddock peel, placing the shaddock peel into a grinder, grinding to obtain shaddock peel powder, mixing the shaddock peel powder with water, placing the mixture into a container to obtain suspension, adding an alkaline protease/carboxylic acid reductase complex enzyme into the container, and performing enzymolysis for 3-4h at the temperature of 30-35 ℃;

2) after the enzymolysis is finished, dehydrating and drying to obtain a solid matter, adding a solvent and a catalyst into the solid matter, heating to 85-90 ℃ under microwave irradiation, and then carrying out heat preservation irradiation for 20-30 min;

3) placing the product obtained in step 2) under ultraviolet irradiation, adding benzophenone and lauryl glucoside, and stirring for 10-15 min;

4) and (3) stirring the obtained product in the step 3) and the waste edible oil in vacuum for 5-10min, and then adding the manganese slag in vacuum and stirring to obtain the manganese-containing mineral.

2. The agent for inhibiting shrinkage of cement-based materials according to claim 1, wherein the alkaline protease/carboxylate reductase complex enzyme in step 1) is used in an amount of 1-3% by mass of the suspension; wherein the dosage ratio of the alkaline protease to the carboxylic acid reductase is 1: (0.2-0.7).

3. The agent for inhibiting shrinkage of cement-based materials according to claim 1, wherein the solvent in step 2) is glacial acetic acid in an amount that is (9-16) times the amount of solids.

4. The agent for inhibiting shrinkage of cement-based materials according to claim 1, wherein the catalyst in step 2) is N-bromosuccinimide in an amount of 1-5% by mass of the solids.

5. The agent for inhibiting shrinkage of cement-based materials as claimed in claim 1, wherein the power of the microwave irradiation in step 2) is 320-.

6. The agent for inhibiting shrinkage of cement-based materials according to claim 1, wherein the mass ratio of the product obtained in step 2) in step 3) to benzophenone and lauryl glucoside is 1: (0.01-0.03): (0.2-0.5).

7. The agent for inhibiting shrinkage of cement-based materials according to claim 1, wherein the irradiation wavelength of the ultraviolet light in step 3) is 300-400 nm.

8. The agent for inhibiting the shrinkage of cement-based materials according to claim 1, wherein the substances obtained in step 3), the waste edible oil and the manganese slag in step 4) are mixed according to the following weight parts: 20-30 parts of the product obtained in the step 3), 12-17 parts of waste edible oil and 1-2 parts of manganese slag.

9. The agent for inhibiting shrinkage of cementitious materials of claim 1, wherein the vacuum agitation in step 4) is at a temperature of 45-55 ℃.

10. The agent for inhibiting shrinkage of cement-based materials according to claim 1, wherein the manganese slag is ball-milled into powder with a particle size of 200 mesh before being added, and 10-15% by mass of the hydroxyl silicone oil is slowly added during the ball-milling process.

Technical Field

The invention belongs to the technical field of manufacturing of building material additives, and particularly relates to a reagent for inhibiting the shrinkage of a cement-based material.

Background

The cement-based material is a heterogeneous complex mixture with multiple phases and multiple pores, and the mixture is a continuous phase after hydration, so that the internal pore structure plays a vital role in leading water and chemical substances into and out of concrete, and the durability and the workability of the concrete are directly influenced; the cement is an aggregate of various minerals, the physical and chemical actions of hydration reaction are very complex, and the main hydration products comprise calcium silicateHydrate (C-S-H) of about 70%, calcium hydroxide Ca (OH)₂About 20 percent, ferro-aluminum phase hydrate, hydrated calcium sulphoaluminate, hydrated calcium monosulphuric aluminate and the like, about 7 percent, and 3 percent of residues and other impurities of unhydrated clinker; about 5% of the hydration products occupy the original water-filled space, and along with the progress of the hydration process, the original water-filled space is reduced, and the unfilled space is gradually divided into complex capillary pores; on the one hand, since C-S-H is amorphous, for this reason, its organic composition on the molecular scale is poor; on the other hand, the solution remained in the pores is in contact with the outside to generate chemical reaction, which can cause Alkali Silicate Reaction (ASR) to cause the problems of reinforcing steel bar corrosion, sulfate corrosion, seawater corrosion, concrete peeling and the like.

At present, the shrinkage reducing agent or the expanding agent is added when the cement-based material is stirred, which is a means for effectively preventing the problems of reinforcing steel bar corrosion, sulfate corrosion, seawater corrosion, concrete peeling and the like. However, the existing shrinkage reducing agent is mainly a liquid product, has high organic solvent content, is volatile, has pungent odor and influences the body health of constructors, so the application effect is not ideal. When the swelling agent is added, the water retention maintenance is carried out for at least 14 days, and the problems of delayed ettringite generation and cement adaptability are caused, so that the application is careful. It is therefore of great importance to investigate an agent for inhibiting the shrinkage of cement-based materials.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides an agent for inhibiting the shrinkage of a cement-based material.

The method is realized by the following technical scheme:

the invention provides a reagent for inhibiting the shrinkage of a cement-based material, and a preparation method thereof, wherein the preparation method comprises the following steps:

1) weighing shaddock peel, placing the shaddock peel into a grinder, grinding to obtain shaddock peel powder, mixing the shaddock peel powder with water, placing the mixture into a container to obtain suspension, adding an alkaline protease/carboxylic acid reductase complex enzyme into the container, and performing enzymolysis for 3-4h at the temperature of 30-35 ℃;

2) after the enzymolysis is finished, dehydrating and drying to obtain a solid matter, adding a solvent and a catalyst into the solid matter, heating to 85-90 ℃ under microwave irradiation, and then carrying out heat preservation irradiation for 20-30 min;

3) placing the product obtained in step 2) under ultraviolet irradiation, adding benzophenone and lauryl glucoside, and stirring for 10-15 min;

4) vacuum stirring the obtained product in the step 3) and the waste edible oil for 5-10min, and then adding manganese slag and vacuum stirring to obtain the manganese slag-containing oil;

the alkaline protease/carboxylic acid reductase complex enzyme in the step 1) is used in an amount of 1-3% of the mass of the suspension; wherein the dosage ratio of the alkaline protease to the carboxylic acid reductase is 1: (0.2-0.7).

In the step 2), the solvent is glacial acetic acid, and the dosage of the glacial acetic acid is 9-16 times of the solid matter.

In the step 2), the catalyst is N-bromosuccinimide, and the dosage of the N-bromosuccinimide is 1-5% of the solid substance.

The power of the microwave irradiation in the step 2) is 320-370W.

In the step 3), the mass ratio of the substance obtained in the step 2), the benzophenone and the lauryl glucoside is 1: (0.01-0.03): (0.2-0.5).

The irradiation wavelength of the ultraviolet light in the step 3) is 300-400 nm.

Mixing the substance obtained in the step 3), the waste edible oil and the manganese slag in the step 4) according to the following parts by weight: 20-30 parts of the product obtained in the step 3), 12-17 parts of waste edible oil and 1-2 parts of manganese slag.

Stirring under vacuum in step 4), wherein the temperature is 45-55 ℃.

The manganese slag is ball-milled into powder with the granularity of 200 meshes before being added, and hydroxyl silicone oil with the mass of 10-15% is slowly added in the ball-milling process.

The agent for inhibiting the shrinkage of the cement-based material is used in the cement-based material, and the mixing amount is 3-5%.

Has the advantages that:

the reagent has low manufacturing cost, realizes the reutilization of wastes, can inhibit the expansion performance of the cement-based material, and ensures the durability and the mechanical property of the cement-based concrete.

(1) According to the invention, the shaddock peel is used as a raw material, protein is dissolved through enzyme treatment, the shaddock peel has good foaming and foam stabilizing capabilities, and a peptide chain can form a protection net due to the increase of viscosity, so that the mechanical property is ensured; simultaneously, the content of carboxyl is ensured, and the hydration heat can be reduced by matching with hydroxyl.

(2) The method takes glacial acetic acid as a solvent and N-bromosuccinimide as a catalyst, can enable part of shaddock peel enzymolysis products to generate esterification reaction, enhances the lipophilicity, and enables the reagent to have an amphiphilic function, so that the surface tension of a gas-liquid interface can be reduced, the capillary pore tension is further reduced, and the effect of restraining shrinkage is achieved.

(3) According to the invention, the benzophenone and the lauryl glucoside are added into the shaddock peel treated matter for treatment, and then the waste edible oil is added, so that the waste edible oil is emulsified and uniformly distributed, and further, the saponification reaction is improved, and the uniformly formed matter is filled in concrete pores.

(4) According to the invention, the activity of the amphiphilic functional group is excited by using the manganese slag, so that the long-term reaction of the reagent is ensured, the coordination of the hydration process of cement is facilitated, the reinforcement effect is achieved, and the mechanical property is improved.

Detailed Description

The following is a detailed description of the embodiments of the present invention, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments are included in the scope of the present invention as claimed in the claims.