Preparation method and application of cement-based material additive

Abstract

The invention discloses a preparation method and application of a cement-based material additive. The preparation method comprises the following steps: preparing a calcium chloride solution and a sodium bicarbonate solution with equal mass to prepare porous calcium carbonate microspheres; inoculating bacillus lysine into a culture medium, and adding a spore efficient transforming agent into a culture solution; putting the calcium carbonate microspheres into a lysine bacillus spore culture solution, and fully standing until the concentration of the spore culture solution tends to be stable so as to obtain calcium carbonate microspheres loaded with microbial spores; dissolving the calcium carbonate microspheres loaded with the microbial spores into a mixed solution of sodium alginate and barium silver, uniformly stirring, and coating the surface layers of the calcium carbonate microspheres through spray drying. Results show that the cement-based material additive prepared by the method is suitable for maritime work environments, can effectively fill and block cracks of cement-based materials, improves the durability of engineering and prolongs the service life of the engineering.

Description

technical field [0001] The invention belongs to the field of cement material modification, and relates to a preparation method and application of a cement-based material additive. Background technique [0002] Marine development requires the construction of a large number of marine or coastal projects. However, the relatively low tensile strength makes cement-based materials inevitably crack under the action of internal and external factors, and seawater contains Cl - , SO 4 2- and Mg 2+ After plasma intrusion reacts with cement hydration products, it will cause different degrees of erosion and damage to engineering structures, resulting in continuous degradation of cement-based materials, seriously affecting the durability and service life of buildings. Therefore, how to repair the cracks of cement-based materials in a timely and effective manner is one of the problems that need to be solved urgently to ensure the long-term safe operation of marine construction projects...

AI Technical Summary

Problems solved by technology

However, there are many problems in the above methods. The liquid binder is difficult to harden in the water environment, the mineral additives must be encapsulated to avoid premature failure, and the ion complexing agent is harsh on the repair environment. Moreover, these methods are expensive and often cannot be put into practical engineering applications.

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