Stone aggregate wrapped by microfine fibre polymer mortar thin layer and preparation method thereof

Abstract

The invention discloses a stone aggregate wrapped by a microfine fibre polymer mortar thin layer and a preparation method thereof; the stone aggregate is formed by stone aggregate inner cores, an adhesive inner wrapping layer, a polymer cement mortar outer wrapping layer and an adhesive microfine fibre hair layer, wherein the adhesive inner wrapping layer and the stone aggregate are adhered firmly; microfine fibre filaments are anchored and rooted on the adhesive inner wrapping layer; and the polymer cement mortar outer wrapping layer and the adhesive inner wrapping layer are soluble mutually and can effectively form a whole body. Active powder in the polymer cement mortar outer wrapping layer contains silica fume, zeolite powder, finely-ground mineral slag, pulverized coal ash and the like, and can generate volcanic ash reaction with Ca(OH)2 crystal at the interface position of the set cement so as to generate gelled materials, and further carry out improved treatment on the weakest interfaces of set cement and the stone aggregate in concrete. The modified stone aggregate of the invention has good affinity with the set cement, and has higher binding power with the set cement.

Description

Technical field [0001] The invention relates to a modified stone aggregate, which is beneficial to improve the bonding performance of the stone aggregate and cement stone interface, can increase the compressive strength of concrete products, and improve the use performance of concrete products. Background technique [0002] When concrete is mixed with superplasticizer, fly ash, silica fume, zeolite, steel fiber, polypropylene fiber, it can effectively improve the strength and other performance of concrete. However, the microscopic analysis of concrete shows that the incorporation of water-reducing agent, active powder and fiber can only effectively improve the compactness and mechanical strength of cement stone in concrete, and the bonding force to the transition zone between the aggregate and cement stone interface. The improvement effect is not obvious, and there are areas where the interface between stone aggregate and cement stone is weak. [0003] The strength of concrete is ...

AI Technical Summary

Problems solved by technology

There are more weaker Ca(OH) in the interface region 2 Crystal, the number of pores in the interface area is more than that in the cement stone area. These characteristics determine that the strength of the interface transition area is low, and cracks are easily caused, which will have an adverse effect on the interface bonding.

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