Low cementitious material self-compacting concrete

Abstract

The invention discloses low cementitious material self-compacting concrete. Cement is a main raw material in a cementitious material of the self-compacting concrete; and if the cement consumption is high, overhigh concrete shrinkage is easily caused due to overhigh hydration heat of the cement, which is unfavorable for concrete crack control and concrete durability improvement, and problems such as disintegration, bleeding and the like easily occur. An additive XAMC is added into the concrete formula and can adsorb onto surfaces of particles to form a close adsorption layer so as to prevent the particles from flocculating and aggregating to realize the dispersion and stabilization function. Water-washing superfine sand which is rich in resources replaces partial mineral admixture, the lowcementitious material self-compacting concrete can meet the basic requirement of high strength concrete by adding the XAMC under the condition of reducing cement consumption, and has obvious thickening and water retaining functions; concrete mixtures do not bleed or disintegrate, the homogenization and workability of the concrete are improved, and the concrete has important significance for saving energy and reducing emission.

Description

technical field [0001] The invention relates to a self-compacting concrete, in particular to a low-glue self-compacting concrete prepared by using ultra-fine tailings sand instead of part of the cementitious material. Background technique [0002] Self-compacting concrete refers to the concrete that has high fluidity, good cohesion, uniformity and stability, and is compacted without vibrating by relying on its own weight during pouring. With the rapid development of the modernization of concrete construction projects in our country, self-compacting concrete has attracted widespread attention in our country, and its popularization and application have grown rapidly. Self-compacting concrete can fill the formwork by its own weight, without surface air bubbles or honeycomb pockmarks, and does not require surface repair; it can realistically present the texture or shape of the formwork surface, improving the appearance quality of the concrete. Without vibration, it can be poure...

AI Technical Summary

Problems solved by technology

Tailings account for about 1 / 3 of the country's solid waste, but the comprehensive utilization rate of tailings is only about 8.2%. Tailings are discharged into rivers, valleys, and lowlands, polluting water, soil and atmosphere, damaging the environment, and even causing disasters

The mine tailings storage site also occupies a large amount of farmland and forest land, which also pollutes the environment to a certain extent.

Images