阅读说明：本技术 一种生物质混凝土减缩剂的制备方法 (Preparation method of biomass concrete shrinkage reducing agent ) 是由 黄金华 于 2019-10-22 设计创作，主要内容包括：本发明涉及一种生物质混凝土减缩剂的制备方法,属于建筑添加剂制备技术领域。本发明制得的减缩剂在加入混凝土浆料之后,由于鸡毛蛋白中二硫键数量多、柔性好,蛋白胶体黏度较高,部分肽链会在气液界面上伸展,这些封闭的气泡有缓冲、卸压的作用,也降低了混凝土的干燥收缩值,具有明显的减缩作用；本发明减缩剂的鸡毛蛋白和酶解产物中的大豆磷脂都具有两亲性功能,可以吸附在空气与混凝土孔溶液接触的气-液界面上,酶解产物中还富含亲水性酶解产物,它的存在可以将混凝土毛细管中的水分子牢固的固着在混凝土内部,提高减缩效果；本发明制得的混凝土减缩剂是以生物质原料为基础,不含有机溶剂,不易挥发,具有广阔的应用前景。(The invention relates to a preparation method of a biomass concrete shrinkage reducing agent, belonging to the technical field of preparation of building additives. After the shrinkage reducing agent prepared by the invention is added into concrete slurry, because the number of disulfide bonds in the chicken feather protein is large, the flexibility is good, the viscosity of protein colloid is high, part of peptide chains can extend on a gas-liquid interface, and the closed bubbles have the functions of buffering and pressure relief, so that the drying shrinkage value of the concrete is also reduced, and the shrinkage reducing agent has an obvious shrinkage reducing function; the chicken feather protein and the soybean lecithin in the enzymatic hydrolysate of the shrinkage reducing agent have amphiphilic functions, can be adsorbed on a gas-liquid interface of air in contact with a concrete pore solution, and are rich in hydrophilic enzymatic hydrolysate which can firmly fix water molecules in a concrete capillary tube in the concrete, so that the shrinkage reducing effect is improved; the concrete shrinkage reducing agent prepared by the invention is based on biomass raw materials, does not contain organic solvents, is not easy to volatilize, and has wide application prospect.)

1. A preparation method of a biomass concrete shrinkage reducing agent is characterized by comprising the following specific preparation steps:

(1) mixing the reaction filtrate and the enzymolysis product, then putting the mixture into a reaction kettle, and stirring and mixing the mixture for 10-15 min at the temperature of 30-40 ℃ and the rotating speed of 200-300 r/min to obtain a mixed solution;

(2) putting the obtained mixed solution into a vacuum concentration tank, and concentrating under reduced pressure for 40-50 min to obtain a concentrated solution, namely the biomass concrete shrinkage reducing agent;

the preparation steps of the reaction filtrate are as follows:

(1) mixing the waste chicken feathers with hydrochloric acid with the concentration of 0.6mol/L, soaking for 3-4 hours at the temperature of 70-80 ℃, filtering and separating to obtain filter residues, mixing the filter residues with a sodium bisulfite solution with the mass fraction of 30%, continuing soaking for 3-4 hours at the temperature of 60-70 ℃, filtering and separating to obtain filter cakes;

(2) mixing the obtained filter cake with a sodium hydroxide solution with the concentration of 0.5mol/L, putting the mixture into a microwave oscillator, carrying out microwave oscillation reaction for 1-2 h at the temperature of 50-65 ℃ and the power of 200-300W, and filtering and separating to remove reaction filter residues after the reaction is finished to obtain reaction filtrate;

the preparation steps of the enzymolysis product are as follows:

(1) weighing soybeans, putting the soybeans into a grinder, grinding the soybeans to obtain soybean ground substances, mixing the soybean ground substances with water, putting the mixture into a beaker to obtain mixed liquid, adding alkaline protease into the beaker, and carrying out enzymolysis for 3-4 hours at the temperature of 30-35 ℃;

(2) and after the enzymolysis is finished, filtering and separating to obtain filtrate, putting the filtrate into a beaker, heating to 50-55 ℃, adjusting the pH to 5.0-6.0 by using a citric acid solution with the concentration of 1mol/L, stirring for 10-15 min, adding carboxylic acid hydrolase into the beaker, carrying out enzymolysis for 6-8 h at the temperature of 50-55 ℃, and obtaining an enzymolysis product after the enzymolysis is finished.

2. The preparation method of the biomass concrete shrinkage reducing agent according to claim 1, wherein the preparation method comprises the following steps: in the specific preparation step (1) of the biomass concrete shrinkage reducing agent, the mass ratio of the reaction filtrate to the enzymolysis product is 1: 1.

3. The preparation method of the biomass concrete shrinkage reducing agent according to claim 1, wherein the preparation method comprises the following steps: in the specific preparation step (2) of the biomass concrete shrinkage reducing agent, the pressure of the vacuum concentration tank for reduced pressure concentration is 900-1000 Pa.

4. The preparation method of the biomass concrete shrinkage reducing agent according to claim 1, wherein the preparation method comprises the following steps: in the preparation step (1) of the reaction filtrate, the mass ratio of the waste chicken feather to the hydrochloric acid with the concentration of 0.6mol/L is 1: 20.

5. The preparation method of the biomass concrete shrinkage reducing agent according to claim 1, wherein the preparation method comprises the following steps: in the preparation step (1) of the reaction filtrate, the mass ratio of the filter residue to the sodium bisulfite solution with the mass fraction of 30% is 1: 15.

6. The preparation method of the biomass concrete shrinkage reducing agent according to claim 1, wherein the preparation method comprises the following steps: in the preparation step (2) of the reaction filtrate, the mass ratio of the filter cake to the sodium hydroxide solution with the concentration of 0.5mol/L is 1: 5.

7. The preparation method of the biomass concrete shrinkage reducing agent according to claim 1, wherein the preparation method comprises the following steps: in the preparation step (1) of the enzymolysis product, the mass ratio of the soybean crushed material to water is 1: 5.

8. The preparation method of the biomass concrete shrinkage reducing agent according to claim 1, wherein the preparation method comprises the following steps: in the step (1) of preparing the enzymolysis product, the adding amount of the alkaline protease is 5% of the mass of the mixed solution.

9. The preparation method of the biomass concrete shrinkage reducing agent according to claim 1, wherein the preparation method comprises the following steps: in the step (2) of preparing the enzymolysis product, the addition amount of the carboxylic acid hydrolase is 3% of the mass of the filtrate.

Technical Field

The invention relates to a preparation method of a biomass concrete shrinkage reducing agent, belonging to the technical field of preparation of building additives.

Background

The concrete shrinkage reducing agent is prepared from polycarboxylic acid raw materials, and cannot generate negative influence on concrete drying shrinkage. The feasibility and rationality of abandoning UEA-type swelling agents in tunnel engineering and replacing them with polycarboxylic acid-based starting materials. The drying shrinkage of a free shrinkage test piece and a concrete test piece with limited two ends is sequentially researched by using a polycarboxylic acid raw material, a UEA expanding agent and a magnesium expanding agent, and the test of the polycarboxylic acid high-efficiency water reducing agent and the UEA expanding agent on the drying shrinkage of the concrete under different gel material dosages is carried out. The result shows that compared with the expanding agent, the polycarboxylic acid high-efficiency water reducing agent does not bring negative influence on the drying shrinkage performance of the concrete and also has a certain improvement effect. In the tunnel engineering practice, it is reasonable and feasible to replace UEA expanding agents with polycarboxylic acid-based raw materials, which is beneficial to the durability of concrete structures.

The crack problem of concrete has plagued the building engineering world in recent years. The cause of the crack is many, and the most important is a non-load crack caused by plastic shrinkage, drying shrinkage, and the like. These cracks provide a pathway for air and water to enter the concrete, accelerating the deterioration of the concrete and causing the corrosion of the reinforcing steel bars, and in cold areas, freeze-thaw damage can occur, further aggravating the process. These all can reduce the durability of concrete, influence the life of engineering, and serious person will threaten personal and property safety.

Therefore, it has become a hot spot of current research through which to reduce shrinkage of concrete, improve durability of concrete, and prevent corrosion of reinforcing steel bars. The existing method for solving the problem is to add shrinkage reducing agent, expanding agent and fiber or improve curing conditions and the like when the concrete is stirred. The research and the report of the shrinkage reducing agent in China begin in the 90 s of the 20 th century, and the shrinkage reducing agent has higher cost and single function and influences the later strength of concrete, so the shrinkage reducing agent is not popularized and applied all the time. In China, the formed concrete shrinkage reducing agent products are few. One of the remarkable characteristics of the shrinkage-reducing agent is that the action effect is not influenced by construction and maintenance conditions, and the shrinkage-reducing agent is suitable for construction projects under various maintenance conditions. However, the existing shrinkage reducing agent is mainly a liquid product, has high organic solvent content, is volatile, has pungent odor, affects the health of constructors, cannot be used as an anti-cracking material for preparing dry-mixed mortar, and has an undesirable effect of reducing concrete.

The steel bar corrosion is a main factor causing the reinforced concrete to be damaged, and the use of the steel bar rust inhibitor is one of effective methods for prolonging the durable life of the reinforced concrete, and the steel bar rust inhibitor is widely applied to newly built and built concrete projects and used for resisting the steel bar corrosion. Inorganic corrosion inhibitors such as chromates and molybdates are currently most used to reduce the number of active sites in the passive film, but have a large negative effect on the setting time and early strength of the concrete. Ca (NO) in the seventies of the last century₂)₂Proved to be capable of effectively increasing the critical Cl-concentration and [ Cl-]/[OH-]In proportion to, but also do not cause alkali-aggregate reaction and concrete strength change, and becomeA steel bar corrosion inhibitor which is widely used. In recent years, however, many countries have been gradually banned due to serious environmental pollution. In recent years, polymer rust inhibitors and composite rust inhibitors become hot research at home and abroad, but compared with the foreign countries, the research on the two types of rust inhibitors at home has a larger gap.

Therefore, the biomass concrete shrinkage reducing agent which does not contain organic solvent, is not easy to volatilize and has good shrinkage reducing effect has positive significance to the technical field of preparation of building additives.

Disclosure of Invention

The invention mainly solves the technical problems, and provides a preparation method of a biomass concrete shrinkage reducing agent aiming at the defects that the common shrinkage reducing agent has high organic solvent content, is volatile, has pungent smell, influences the health of constructors and has an unsatisfactory shrinkage reducing effect on concrete.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a preparation method of the biomass concrete shrinkage reducing agent comprises the following steps:

(1) mixing the reaction filtrate and the enzymolysis product, then putting the mixture into a reaction kettle, and stirring and mixing the mixture for 10-15 min at the temperature of 30-40 ℃ and the rotating speed of 200-300 r/min to obtain a mixed solution;

(2) putting the obtained mixed solution into a vacuum concentration tank, and concentrating under reduced pressure for 40-50 min to obtain a concentrated solution, namely the biomass concrete shrinkage reducing agent;

the preparation method of the reaction filtrate comprises the following steps:

(1) mixing the waste chicken feathers with hydrochloric acid with the concentration of 0.6mol/L, soaking for 3-4 hours at the temperature of 70-80 ℃, filtering and separating to obtain filter residues, mixing the filter residues with a sodium bisulfite solution with the mass fraction of 30%, continuing soaking for 3-4 hours at the temperature of 60-70 ℃, filtering and separating to obtain filter cakes;

(2) mixing the obtained filter cake with a sodium hydroxide solution with the concentration of 0.5mol/L, putting the mixture into a microwave oscillator, carrying out microwave oscillation reaction for 1-2 h at the temperature of 50-65 ℃ and the power of 200-300W, and filtering and separating to remove reaction filter residues after the reaction is finished to obtain reaction filtrate;

the preparation method of the enzymolysis product comprises the following steps:

(1) weighing soybeans, putting the soybeans into a grinder, grinding the soybeans to obtain soybean ground substances, mixing the soybean ground substances with water, putting the mixture into a beaker to obtain mixed liquid, adding alkaline protease into the beaker, and carrying out enzymolysis for 3-4 hours at the temperature of 30-35 ℃;

(2) and after the enzymolysis is finished, filtering and separating to obtain filtrate, putting the filtrate into a beaker, heating to 50-55 ℃, adjusting the pH to 5.0-6.0 by using a citric acid solution with the concentration of 1mol/L, stirring for 10-15 min, adding carboxylic acid hydrolase into the beaker, carrying out enzymolysis for 6-8 h at the temperature of 50-55 ℃, and obtaining an enzymolysis product after the enzymolysis is finished.

In the preparation method of the biomass concrete shrinkage reducing agent, the mass ratio of the reaction filtrate to the enzymolysis product is 1: 1.

In the preparation method of the biomass concrete shrinkage reducing agent, the pressure of the vacuum concentration tank for reduced pressure concentration is 900-1000 Pa.

In the preparation method of the reaction filtrate, the mass ratio of the waste chicken feather to the hydrochloric acid with the concentration of 0.6mol/L is 1: 20.

In the preparation method of the reaction filtrate, the mass ratio of the filter residue to the sodium bisulfite solution with the mass fraction of 30 percent is 1: 15.

In the preparation method of the reaction filtrate, the mass ratio of the filter cake to the sodium hydroxide solution with the concentration of 0.5mol/L is 1: 5.

In the preparation method of the enzymolysis product, the mass ratio of the soybean crushed material to the water is 1: 5.

In the preparation method of the enzymolysis product, the adding amount of the alkaline protease is 5 percent of the mass of the mixed solution.

In the preparation method of the enzymolysis product, the addition amount of the carboxylic acid hydrolase is 3 percent of the mass of the filtrate.

The invention has the beneficial effects that:

(1) the invention takes chicken feather as raw material, the disulfide bond part in the chicken feather is opened through acid leaching and sodium sulfite solution soaking treatment, the solubility of the chicken feather is improved, then the chicken feather is dissolved by alkali liquor, reaction filtrate rich in the chicken feather is obtained, then soybeans are taken as raw material, enzymolysis products rich in soybean phospholipid and hydrophilic enzymolysis products are prepared through an aqueous enzymatic method, finally the reaction filtrate rich in the chicken feather and the enzymolysis products are mixed and decompressed and concentrated, and finally the biomass concrete shrinkage reducing agent is prepared. The mechanical strength of the foam interface film is increased, and the closed bubbles have the functions of buffering and pressure relief, reduce the drying shrinkage value of concrete and have obvious shrinkage reducing function;

(2) the chicken feather protein of the shrinkage reducing agent and the soybean lecithin in the enzymolysis products have amphiphilic functions, can be adsorbed on a gas-liquid interface of air in contact with a concrete pore solution, and can obviously reduce the surface tension of the gas-liquid interface, so that the capillary pore tension borne by the capillary wall is reduced, and an excellent effect on reducing shrinkage is achieved;

(3) the concrete shrinkage reducing agent prepared by the invention is based on biomass raw materials, is safe and environment-friendly, does not contain organic solvents, is not easy to volatilize, does not have any influence on the health of constructors, and has wide application prospect.

Detailed Description

Mixing the waste chicken feathers with hydrochloric acid with the concentration of 0.6mol/L according to the mass ratio of 1:20, soaking for 3-4 hours at the temperature of 70-80 ℃, filtering and separating to obtain filter residues, mixing the filter residues with a sodium bisulfite solution with the mass fraction of 30% according to the mass ratio of 1:15, continuing soaking for 3-4 hours at the temperature of 60-70 ℃, filtering and separating to obtain filter cakes; mixing the obtained filter cake and a sodium hydroxide solution with the concentration of 0.5mol/L according to the mass ratio of 1:5, putting the mixture into a microwave oscillator, carrying out microwave oscillation reaction for 1-2 hours at the temperature of 50-65 ℃ and with the power of 200-300W, and filtering and separating to remove reaction filter residues after the reaction is finished to obtain reaction filtrate for later use; weighing soybeans, putting the soybeans into a grinder, grinding the soybeans to obtain soybean ground substances, mixing the soybean ground substances and water according to a mass ratio of 1:5, putting the mixture into a beaker to obtain a mixed solution, adding alkaline protease accounting for 5% of the mixed solution by mass into the beaker, and carrying out enzymolysis for 3-4 hours at the temperature of 30-35 ℃; after the enzymolysis is finished, filtering and separating to obtain filtrate, putting the filtrate into a beaker, heating to 50-55 ℃, adjusting the pH to 5.0-6.0 by using a citric acid solution with the concentration of 1mol/L, stirring for 10-15 min, adding carboxylic acid hydrolase with the mass of 3% of the filtrate into the beaker, carrying out enzymolysis for 6-8 h at the temperature of 50-55 ℃, and obtaining an enzymolysis product after the enzymolysis is finished; mixing the standby reaction filtrate and the obtained enzymolysis product according to the mass ratio of 1:1, then putting the mixture into a reaction kettle, stirring and mixing the mixture at the temperature of 30-40 ℃ and the rotating speed of 200-300 r/min for 10-15 min to obtain a mixed solution, putting the mixed solution into a vacuum concentration tank, and carrying out reduced pressure concentration on the mixed solution for 40-50 min under the pressure of 900-1000 Pa to obtain a concentrated solution, namely the biomass concrete shrinkage-reducing agent.

Preparation of reaction filtrate: mixing the waste chicken feathers with hydrochloric acid with the concentration of 0.6mol/L according to the mass ratio of 1:20, soaking for 3 hours at the temperature of 70 ℃, filtering and separating to obtain filter residues, mixing the filter residues with a sodium bisulfite solution with the mass fraction of 30% according to the mass ratio of 1:15, continuing soaking for 3 hours at the temperature of 60 ℃, filtering and separating to obtain filter cakes;

mixing the obtained filter cake and a sodium hydroxide solution with the concentration of 0.5mol/L according to the mass ratio of 1:5, putting the mixture into a microwave oscillator, carrying out microwave oscillation reaction for 1h at the temperature of 50 ℃ and with the power of 200W, and filtering and separating to remove reaction filter residues after the reaction is finished to obtain reaction filtrate for later use;

preparation of an enzymolysis product: weighing soybeans, putting the soybeans into a grinder, grinding the soybeans to obtain soybean ground substances, mixing the soybean ground substances and water according to a mass ratio of 1:5, putting the mixture into a beaker to obtain mixed liquid, adding alkaline protease accounting for 5% of the mixed liquid by mass into the beaker, and carrying out enzymolysis for 3 hours at 30 ℃;

after the enzymolysis is finished, filtering and separating to obtain filtrate, putting the filtrate into a beaker, heating to 50 ℃, adjusting the pH to 5.0 by using a citric acid solution with the concentration of 1mol/L, stirring for 10min, adding carboxylic acid hydrolase with the mass of 3% of the filtrate into the beaker, carrying out enzymolysis for 6h at 50 ℃, and obtaining an enzymolysis product after the enzymolysis is finished;

preparing a biomass concrete shrinkage reducing agent: mixing the prepared reaction filtrate and the obtained enzymolysis product according to the mass ratio of 1:1, then putting the mixture into a reaction kettle, stirring and mixing the mixture for 10min at the temperature of 30 ℃ and the rotating speed of 200r/min to obtain a mixed solution, putting the mixed solution into a vacuum concentration tank, and carrying out reduced pressure concentration for 40min under the pressure of 900Pa to obtain a concentrated solution, namely the biomass concrete shrinkage-reducing agent.

Preparation of reaction filtrate: mixing the waste chicken feathers with hydrochloric acid with the concentration of 0.6mol/L according to the mass ratio of 1:20, soaking for 3.5 hours at the temperature of 75 ℃, filtering and separating to obtain filter residues, mixing the filter residues with a sodium bisulfite solution with the mass fraction of 30% according to the mass ratio of 1:15, continuing soaking for 3.5 hours at the temperature of 65 ℃, filtering and separating to obtain filter cakes;

mixing the obtained filter cake and a sodium hydroxide solution with the concentration of 0.5mol/L according to the mass ratio of 1:5, putting the mixture into a microwave oscillator, carrying out microwave oscillation reaction for 1.5h at the temperature of 60 ℃ and the power of 250W, filtering and separating the reaction filter residue after the reaction is finished, and obtaining reaction filtrate for later use;

preparation of an enzymolysis product: weighing soybeans, putting the soybeans into a grinder, grinding the soybeans to obtain soybean ground substances, mixing the soybean ground substances and water according to a mass ratio of 1:5, putting the mixture into a beaker to obtain mixed liquid, adding alkaline protease accounting for 5% of the mixed liquid by mass into the beaker, and carrying out enzymolysis for 3.5 hours at 32 ℃;

after the enzymolysis is finished, filtering and separating to obtain filtrate, putting the filtrate into a beaker, heating to 52 ℃, adjusting the pH to 5.5 by using a citric acid solution with the concentration of 1mol/L, stirring for 12min, adding carboxylic acid hydrolase with the mass of 3% of the filtrate into the beaker, carrying out enzymolysis for 7h at 52 ℃, and obtaining an enzymolysis product after the enzymolysis is finished;

preparing a biomass concrete shrinkage reducing agent: mixing the prepared reaction filtrate and the obtained enzymolysis product according to the mass ratio of 1:1, then putting the mixture into a reaction kettle, stirring and mixing the mixture for 12min at the temperature of 35 ℃ at the rotating speed of 250r/min to obtain a mixed solution, putting the mixed solution into a vacuum concentration tank, and carrying out reduced pressure concentration for 45min under the pressure of 950Pa to obtain a concentrated solution, namely the biomass concrete shrinkage-reducing agent.

Preparation of reaction filtrate: mixing the waste chicken feathers with hydrochloric acid with the concentration of 0.6mol/L according to the mass ratio of 1:20, soaking for 4 hours at the temperature of 80 ℃, filtering and separating to obtain filter residues, mixing the filter residues with a sodium bisulfite solution with the mass fraction of 30% according to the mass ratio of 1:15, continuing soaking for 4 hours at the temperature of 70 ℃, filtering and separating to obtain a filter cake;

mixing the obtained filter cake and a sodium hydroxide solution with the concentration of 0.5mol/L according to the mass ratio of 1:5, putting the mixture into a microwave oscillator, carrying out microwave oscillation reaction for 2 hours at the temperature of 65 ℃ and with the power of 300W, filtering and separating the reaction filter residue after the reaction is finished, and obtaining reaction filtrate for later use;

preparation of an enzymolysis product: weighing soybeans, putting the soybeans into a grinder, grinding the soybeans to obtain soybean ground substances, mixing the soybean ground substances and water according to a mass ratio of 1:5, putting the mixture into a beaker to obtain mixed liquid, adding alkaline protease accounting for 5% of the mixed liquid by mass into the beaker, and carrying out enzymolysis for 4 hours at 35 ℃;

after the enzymolysis is finished, filtering and separating to obtain filtrate, putting the filtrate into a beaker, heating to 55 ℃, adjusting the pH to 6.0 by using a citric acid solution with the concentration of 1mol/L, stirring for 15min, adding carboxylic acid hydrolase with the mass of 3% of the filtrate into the beaker, carrying out enzymolysis for 8h at the temperature of 55 ℃, and obtaining an enzymolysis product after the enzymolysis is finished;

preparing a biomass concrete shrinkage reducing agent: mixing the prepared reaction filtrate and the obtained enzymolysis product according to the mass ratio of 1:1, then putting the mixture into a reaction kettle, stirring and mixing the mixture for 15min at the temperature of 40 ℃ at the rotating speed of 300r/min to obtain a mixed solution, putting the mixed solution into a vacuum concentration tank, and carrying out reduced pressure concentration for 50min under the pressure of 1000Pa to obtain a concentrated solution, namely the biomass concrete shrinkage-reducing agent.

Comparative example 1: essentially the same procedure as in example 2 was followed except that the reaction filtrate was absent.

Comparative example 2: essentially the same procedure as in example 2 was followed except that the enzymatic product was absent.

Comparative example 3: a biomass concrete shrinkage reducing agent produced by Shandong company.

And (3) reduction effect test: referring to a building material industry standard JCT/603-2004 cement mortar dry shrinkage test method, the shrinkage reducing agents of examples 1-3 and the shrinkage reducing agent of the comparative example are doped into cement mortar, and the inhibition effect of drying shrinkage on cement mortar under a dry environment condition is compared and researched.

Organic solvent test: the shrinkage reducing agents of examples 1 to 3 and the shrinkage reducing agent of comparative example were blended in concrete and cured for 28 days, and then the presence or absence of an organic solvent and an offensive odor was measured.

TABLE 1 concrete shrinkage reducing agent Performance measurement results

Test items

Example 1

Example 2

Example 3

Comparative example 1

Comparative example 2

Comparative example 3

Amount of shrinkage （um/m）

505

502

500

735

712

695

Organic solvent

The method has the advantages of no organic solvent, has no pungent odor

No organic solvent, no Pungent odor

No organic solvent, no Pungent odor

The content of the organic solvent is large, heavy pungent smell

The content of the organic solvent is large, heavy pungent smell

The content of the organic solvent is large, heavy pungent smell

According to the detection data, the biomass concrete shrinkage reducing agent disclosed by the invention is good in shrinkage reducing effect, low in shrinkage, free of organic solvent, free of pungent smell and wide in application prospect.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, but rather as the subject matter of the invention is to be construed in all aspects and as broadly as possible, and all changes, equivalents and modifications that fall within the true spirit and scope of the invention are therefore intended to be embraced therein.