Large-dosage fly ash concrete and preparation method thereof

Abstract

The invention provides large-dosage fly ash concrete and a preparation method thereof. The large-dosage fly ash concrete is prepared from the following raw materials: cement, fly ash, mineral powder,gravel, river sand, water, a modified reinforcing agent and a polycarboxylate superplasticizer, wherein the modified reinforcing agent is prepared from bentonite, attapulgite, lignosulfonate, sodium sulfate, calcium hydroxide, triethanolamine maleate and water. The preparation method comprises the following steps: adding the cement, the mineral powder, the fly ash, the modified reinforcing agent,the gravel and the river sand into a mixer; performing dry mixing for 30-40min; adding the water and the superplasticizer into the mixer; mixing for 10-15min to obtain the large-dosage fly ash concrete. According to the large-dosage fly ash concrete and the preparation method thereof provided by the invention, a multifunctional modified synergistic for large-dosage fly ash concrete is prepared from the roasted bentonite together with attapulgite, organic and inorganic activators and a surfactant; by combining the multifunctional modified synergistic with an early-strength polycarboxylate superplasticizer, the aim of improving the strength, compactness and durability of the large-dosage fly ash concrete can be achieved.

Description

technical field [0001] The invention belongs to the technical field of concrete and civil building materials, and particularly relates to a large-volume fly ash concrete and a preparation method thereof. Background technique [0002] As a basic building material, concrete plays an important role in my country's economic construction and social progress. Concrete is composed of cement, sand, gravel and water reducer. The production of concrete cementitious materials is due to high energy consumption and high carbon emissions. There are serious environmental pollution problems with dust emissions. The production of cement requires a large amount of non-renewable resources such as limestone and coal, and the cost is relatively high. Ordinary cement concrete has high compressive strength and high stiffness, but it has shortcomings such as easy shrinkage and cracking during the cementation and hardening process, low flexural strength, poor toughness, and small ultimate elongation...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a kind of large-volume fly ash concrete and its preparation method, utilize roasted bentonite and attapulgite, organic and inorganic activator and surfactant to make a kind of large-volume fly ash concrete Functionally modified synergist, used in combination with early-strength polycarboxylate superplasticizer, can stimulate the fly ash and mineral powder components with low chemical activity through various means, and realize the optimization of the chemical properties of fly ash and mineral powder. Activated, overcomes the defect of low early strength of large-volume fly ash concrete, has the effect of internal water diversion, and is beneficial to the maintenance process of concrete

Images