Viscosity modifier for high or ultrahigh-strength concrete

Abstract

The invention relates to a viscosity modifier for high or ultrahigh-strength concrete. The viscosity modifier comprises the following substances in percentage by weight: 2-10% of silica fume, 10-20% of pulverized coal ash, 2-3% of exciting agent and 67-86% of ultrafine powder. The viscosity modifier added into the high or ultrahigh-strength concrete at a ratio of 10-30% can reduce the viscosity of the concrete by 25-60%. By optimizing the particle size distribution of cementitious materials, the bulk density can be increased, the thicknesses of water film layers on the surfaces of particles in a cementitious system can be increased, the adsorption efficiency of a water reducing agent can be improved, the use amount of the water reducing agent can be reduced, and the viscosity of an aqueous solution in concrete can be lowered. Due to the morphology of powder particles and the action of charges on the surfaces of the powder particles, the interaction force of the particles can be reduced, the viscosity of the concrete can be lowered, and the strength of the concrete can not be affected. The viscosity modifier can be also used for a mortar system with low water-cement ratio.

Description

technical field [0001] The invention relates to an auxiliary agent for building materials, which belongs to the category of concrete admixtures, in particular to a concrete viscosity regulator capable of significantly reducing the viscosity of high-strength or ultra-high-strength concrete. Background technique [0002] With the continuous expansion of the scale of civil engineering and the continuous improvement of the level of science and technology, some important buildings with high-rise large-span and special functional requirements continue to appear, such as skyscrapers, super-long-span bridges and giant water conservancy projects. High strength, better durability, and better stability, these demands have led to the gradual development of concrete from ordinary to high performance and even ultra-high performance. The improvement of concrete strength is mainly achieved by reducing the water-binder ratio, which also leads to higher viscosity of concrete, causing a series...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a high-strength or ultra-high-strength concrete viscosity modifier, which can effectively reduce the viscosity of concrete, and also has the advantages of less dosage, low cost and low impact on strength. Features such as no impact

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