Limestone ultrafine powder concrete with strength grade not higher than C40

Abstract

The invention relates to the technical field of concrete in building materials and discloses limestone ultrafine powder concrete with a strength grade not higher than C40. The limestone ultrafine powder concrete is prepared from coarse aggregate, fine aggregates, cementing materials, water and an additive, wherein the coarse aggregate is rubble; the fine aggregates comprise river sand and machine-made sand; the cementing materials comprises comprise cement, slag powder, fly ash and limestone ultrafine powder; and the additive is a water reducing agent. In the invention, the limestone ultrafine powder replaces certain amount of cement as part of the cementing materials; the prepared limestone ultrafine powder concrete is superior to traditional concrete in terms of working performance, compressive strength, elasticity modulus, durability and the like; and moreover, the cement is saved, the production cost of concrete is reduced, the energy consumption and CO2 discharge in the cement production process are reduced, and the combination of greenness, energy conservation and environmental protection can be realized.

Description

technical field [0001] The invention belongs to the technical field of concrete in building materials, and relates to a limestone superfine powder concrete, in particular to a concrete with a certain proportion of limestone superfine powder as an admixture instead of cement in traditional concrete, and the strength grade is not greater than C40 concrete. Background technique [0002] The construction of a large number of concrete structures, brick-concrete structures, roads, and bridges in China has made concrete the most used building material in civil engineering, thus increasing the demand for concrete raw materials such as fly ash, slag powder, and other admixtures and cement. The quantity is huge, the supply of fly ash is in short supply, the price of slag powder is getting higher and higher, and the production of cement has caused serious waste of resources and serious deterioration of the environment. [0003] Due to the large reserves of limestone in my country and ...

AI Technical Summary

Problems solved by technology

[0002] The construction of a large number of concrete structures, brick-concrete structures, roads, and bridges in China has made concrete the most used building material in civil engineering, thus increasing the demand for concrete raw materials such as fly ash, slag powder, and other admixtures and cement. The quantity is huge, the supply of fly ash is in short supply, the price of slag powder is getting higher and higher, and the production of cement has caused serious waste of resources and serious deterioration of the environment