Viscosity reduction reinforcing agent for concrete and application thereof

Abstract

The invention relates to a viscosity reduction reinforcing agent for concrete and application thereof, particularly relates to a functional composite mineral admixture, and belongs to the technical field of civil engineering materials. The viscosity reduction reinforcing agent for concrete is prepared from the following substances by mass percent: 10%-50% of silica fume, 5%-30% superfine slag powder, 10%-70% of superfine fly ash, 5%-20% of superfine zeolite powder, 1%-40% of superfine silica powder and 1%-10% of inorganic exciting agent. The viscosity reduction reinforcing agent for concrete,provided by the invention, is used for super-remote-distance pump concrete, super-high-rise pump concrete, high-strength high-performance concrete or super-high-performance concrete, and can obviouslyreduce the viscosity of the concrete mixture as well as improve the strength of the concrete. When the viscosity reduction reinforcing agent for concrete is used, the mixing amount of the viscosity reduction reinforcing agent for concrete is 5%-10% of the total mass of a concrete cementing material.

Description

technical field [0001] The invention relates to a viscosity-reducing reinforcing agent for concrete and its application. The viscosity-reducing reinforcing agent for concrete of the invention is a functional composite mineral admixture, which is used to reduce the viscosity of ultra-long-distance pumped concrete and super-high-rise pumped concrete. , high-strength high-performance concrete, ultra-high-performance concrete mixture viscosity, while improving the strength of concrete; belongs to the technical field of civil engineering materials. Background technique [0002] With the demand of engineering construction, in recent years, the number of projects using ultra-long-distance pumped concrete, super high-rise pumped concrete, high-strength high-performance concrete, and ultra-high-performance concrete has gradually increased, such as Shanghai Center Building, Tianjin 117 Building, Guangzhou Zhujiang New Town West tower project, domestic high-speed railway cable trench c...

AI Technical Summary

Problems solved by technology

The mixing ratio of this type of concrete requires a large amount of cementitious materials and low water consumption, resulting in a large yield shear stress of the concrete mixture. In addition, the huge amount of engineering construction in our country and the poor quality of sand and gravel aggregates lead to the failure of concrete mixing. The higher the viscosity of the material, the poorer the workability of the concrete or the pumping pressure exceeds the head of the current pumping equipment, resulting in difficulty in construction or safety accidents such as pipe blockage and explosion, which seriously hinder the progress of major engineering construction and high-strength high-performance concrete. , the promotion and application of ultra-high performance concrete

[0003] Aiming at the problem of high viscosity of concrete mixture, the technical measures mainly include: 1) Use viscosity-reducing polycarboxylate water reducer, but the current viscosity-reducing effect is general, which cannot meet the construction requirements of engineering construction for the viscosity of concrete mixture , and often requires over-mixing to have a certain viscosity-reducing effect, over-mixing leads to serious retardation of concrete; 2) use ultra-fine powder to optimize particle gradation, such as floating beads, ultra-fine limestone powder, etc., through optimizing the powder Body particle gradation, increase the thickness of the water film layer on the surface of the particles as much as possible to reduce the viscosity, this kind of mineral powder can reduce the viscosity of the concrete mixture, but often does not significantly improve the concrete strength after mixing

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