A kind of preparation method and application of cement-based material additive

Abstract

The invention discloses a method for preparing a cement-based material additive and its application. Calcium chloride solution and sodium bicarbonate solution are prepared to produce porous calcium carbonate microspheres; Bacillus lysine is inoculated into the culture medium, Adding a high-efficiency spore transformation agent to the culture solution; putting the calcium carbonate microspheres into the spore culture solution of Bacillus lysinus, 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; The calcium carbonate microspheres loaded with microbial spores are dissolved in a mixed solution of sodium alginate and barium silver, stirred evenly, and the surface coating of the calcium carbonate microspheres is realized by spray drying. The results show that the cement-based material additive prepared by this method is suitable for marine environment, can effectively fill and seal the cracks of cement-based materials, and improve engineering durability and service life.

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.

Images