A self-healing agent for airport pavement based on microbial capsules and its preparation and application

Abstract

The invention belongs to the technical field of crack self-repairing agents, and provides a microbial capsule-based airport pavement self-repairing agent and its preparation and application. The self-healing agent of the present invention includes spore dry powder, nutrients and auxiliary materials, the nutrients include urea, soybean peptone, casein peptone and sodium chloride; the auxiliary materials include microcrystalline cellulose, hydroxypropyl methylcellulose and epoxy resin E-51, urea, soybean peptone, casein peptone, sodium chloride, microcrystalline cellulose, hydroxypropyl methylcellulose and spore dry powder form the core material particles, and epoxy resin E-51 wraps the core material particles in epoxy resin In the resin E‑51, microbiological capsules are formed. When micro-cracks appear in the concrete layer of the airport pavement during use, the pressure forces the wall material of the microbial capsule to break, and the entry of air and water will activate the germination of microbial spores in the capsule, and use the metabolism of the microorganism itself to induce the formation of calcium carbonate precipitation. Capable of self-healing micro cracks.

Description

technical field [0001] The invention relates to the technical field of crack self-healing agents, in particular to a microbial capsule-based airport pavement self-healing agent and its preparation and application. Background technique [0002] With the development of civil aviation, the demand for the number and safety performance of airport runways is getting higher and higher, and the repair efficiency of micro-cracks generated in the concrete layer of airport pavement needs to be improved urgently. The expansion of tiny cracks in the runway base-concrete layer is the main cause of the decline in the load-carrying performance of the pavement, which seriously affects the safety of take-off and landing during navigation. The use of intelligent self-repairing materials is an effective means to realize the automatic repair of micro-cracks on the pavement and prevent the cracks from expanding and destroying the base. [0003] The existing airport pavement repair research mainl...

AI Technical Summary

Problems solved by technology

However, traditional repair materials can only achieve passive repair, and cannot be dynamically identified and repaired when the micro-cracks in the base layer are just generated. Only when the internal cracks develop to a certain scale and are reflected to the surface can they be repaired, which will inevitably lead to low repair efficiency. The difficulty of repair increases, which affects the repair effect, and excessive injection of chemical materials causes waste of resources, which is not conducive to the balance and stability of the airport's ecological environment