Bituminous concrete crack self-healing microcapsule and preparation method of same

Abstract

The invention discloses a bituminous concrete crack self-healing microcapsule and a preparation method of the same. The bituminous concrete crack self-healing microcapsule is composed of epoxy resin film forming matter and repairing liquid, and the weight ratio of the film forming matter to the repairing liquid is 3:1, wherein the repairing liquid is composed of 10-20% of coupling agent, 50-75% of curing agent and 18-30% of curing accelerator by weight. The preparation method of the microcapsule comprises the following steps of: orderly adding the coupling agent, curing agent and curing accelerator into a reaction kettle, stirring evenly by a high-speed shearing emulsifying machine, adding the film forming matter, namely the epoxy resin, and by means of internal phase vaporization, suspension centrifuging, washing and drying, thus obtaining the microcapsule product. The microcapsule provided by the invention can obviously enhance the bitumen self-healing capability and prolong the service life of pavement.

Description

Technical field: [0001] The invention relates to the field of asphalt concrete crack repair, in particular to a self-healing asphalt concrete crack, microcapsules and a preparation method. Background technique: [0002] Fatigue cracking is one of the main problems in the application of asphalt pavement. The fatigue damage of asphalt concrete can be attributed to the initiation and propagation of internal cracks in asphalt concrete under repeated loads. The crack initiation and propagation process is accompanied by stress relaxation in the crack area and for Reducing the interface self-healing and crack surface energy to proceed spontaneously. However, if these cracks or damages cannot be repaired and dealt with in a timely and effective manner, it will not only affect the normal performance and service life of the asphalt concrete structure, but also may cause macroscopic cracks and lead to structural brittle fractures, eventually resulting in serious disasters sex accident...

AI Technical Summary

Problems solved by technology

Adding lime powder can improve the self-healing and performance of asphalt mixture, but the effect is very small; when adding hollow fibers in the asphalt mixture mixing process, when cracks appear on the road surface, the fibers will break and the healing agent inside will be released to achieve The purpose of repairing, but this method has many disadvantages. First, during the mixing process of asphalt mixture, the fibers are easy to break, and the healing agent inside is released in advance, and the purpose of healing cannot be achieved; secondly, the fiber radius is too small. , the hollow fiber manufacturing process is extremely difficult and the cost is high

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