Preparation method of biomass concrete shrinkage reducing agent

Abstract

The invention relates to a preparation method of a biomass concrete shrinkage reducing agent, and belongs to the technical field of preparation of building additives. After the prepared shrinkage reducing agent is added into concrete slurry, due to the fact that the number of disulfide bonds in chicken feather proteins is large and the flexibility is good, the viscosity of protein colloid is high,part of peptide chains can extend on a gas-liquid interface, closed bubbles have the buffering and pressure relieving effects, the drying shrinkage value of concrete is reduced, and the obvious shrinkage reducing effect is achieved; the chicken feather proteins of the shrinkage reducing agent and the soyabean lecithin in an enzymolysis product have amphiphilic functions and can be adsorbed on a gas-liquid interface, in contact with a concrete pore solution, of air; enzymolysis products are rich in hydrophilic enzymolysis products, water molecules in concrete capillary tubes can be firmly fixed in concrete in the presence of the hydrophilic enzymolysis products, and the shrinkage reducing effect is improved; the prepared concrete shrinkage reducing agent is based on biomass raw materials,does not contain organic solvents, is not prone to volatilization and has wide application prospects.

Description

technical field [0001] The invention relates to a preparation method of a biomass concrete shrinkage reducer, which belongs to the technical field of construction additive preparation. Background technique [0002] Concrete shrinkage reducer, made of polycarboxylate raw materials, will not have a negative impact on concrete shrinkage. Feasibility and rationality of abandoning UEA expansion agent and replacing it with polycarboxylate raw material in tunnel engineering. Using polycarboxylate raw materials, UEA expansion agent and magnesium expansion agent, the drying shrinkage of free shrinkage specimens and concrete specimens with two ends restricted was successively studied, and the polycarboxylate series under different amounts of cementitious materials were tested. Experiments on dry shrinkage of concrete with high-efficiency water reducer and UEA expansion agent. The results show that, compared with the expansion agent, the polycarboxylate superplasticizer will not have...

AI Technical Summary

Problems solved by technology

[0007] The technical problem mainly solved by the present invention is to provide a kind of biological shrinkage reducing agent for the defect that the current common shrinkage reducing agent has a large organic solvent content, is volatile, and has a pungent smell, which affects the health of construction workers and has an unsatisfactory shrinkage reduction effect on concrete. The preparation method of material concrete shrinkage reducing agent