Microbial-capsule-based self-repairing agent for airfield pavement, and preparation and application thereof

Abstract

The invention provides a microbial-capsule-based self-repairing agent for an airfield pavement, and preparation and application thereof, belonging to the technical field of self-repairing agents for cracks. The self-repairing agent of the invention comprises dried spore powder, nutrients and auxiliary materials, where the nutrients are composed of urea, soy peptone, casein peptone and sodium chloride, and the auxiliary materials are composed of microcrystalline cellulose, hydroxypropyl methyl cellulose and epoxy resin E-51. The urea, the soy peptone, the casein peptone, the sodium chloride, the microcrystalline cellulose, the hydroxypropyl methyl cellulose and the dried spore powder compose core particles, and the epoxy resin E-51 wraps the core particles therein so as to form a microbialcapsule. When fine cracks of a concrete layer appear during the use of the airfield pavement, pressure will force the wall of the microbial capsule to rupture, then air and moisture will enter the capsule and activate the germination of microbial spores in the capsule, and microbial metabolism will induce the formation of a calcium carbonate precipitate, thereby realizing self-repairing of the fine 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