Preparation method of rubber-powder-doped modified slag micro-powder concrete

Abstract

The invention discloses a preparation method of rubber-powder-doped modified slag micro-powder concrete. In the preparation method, slag and coal gangue are subjected to dual excitation of heat and chemistry, formation of a gelling substance is promoted, so that the material has higher tephra activity; waste rubber powder is subjected to surface etching and modification treatment, so that the surface roughness of rubber particles is improved, and the binding capacity of the rubber powder and a cement matrix is effectively improved; and in addition, the slag material is subjected to grinding and activation, so that the powder is more fine and can be packed into the gap between the rubber powder and cement mortar, also the compatibility between the slag and the rubber powder and between theslag and the cement mortar is also improved, the three components are connected more tightly, and thus the slag powder plays a role of a lubricant among the cement particles, thereby increasing the fluidity of the mortar, and when the material bears external loads, the waste rubber powder and the cement matrix give play to synergic effect and shear the stress, and the elasticity and toughness of the material are enhanced.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a method for preparing rubber powder-doped modified slag micropowder concrete. Background technique [0002] Slag powder is a powder material obtained by grinding granulated water-quenched blast furnace slag to a specified fineness. In the application of cement and concrete, it can be used not only as a mixture of cement, but also as an admixture of concrete. In the production process of slag portland cement, cement clinker and slag are mixed and ground together, and the grindability of slag is worse than that of cement clinker, and the particles are relatively coarse, so its potential activity is difficult to exert. Therefore, slag portland cement The early strength is low and prone to bleeding. Now it has begun to apply the technology of grinding cement clinker and slag to produce slag portland cement. [0003] Excessive rigidity, insufficient elasticity and tough...

AI Technical Summary

Problems solved by technology

[0003] Excessive rigidity, insufficient elasticity and toughness, and poor deformation ability are one of the problems existing in ordinary concrete. In order to improve the elasticity and toughness of ordinary cement concrete and improve its road performance, at the same time, the increasing amount of waste rubber is used to turn waste into treasure.

Rubber particles can improve the toughness and noise reduction performance of cement mortar, but the conventional way of adding rubber powder is only simple physical mixing, which leads to a significant decrease in the compressive and flexural strength of the composite material