Viscosity reinforcing agent having water reducing function and specially used for cement mixture

Abstract

The invention provides a viscosity reinforcing agent having a water reducing function and specially used for a cement mixture. The viscosity reinforcing agent is prepared from, by mass, coarse whiting powder 30-90%, a sedimentation inhibition component 5-55%, a viscosity reinforcing component 1-10%, a water reducing component 0.1-12%, a setting time adjusting component 0-30% and a foam inhibition and stabilization component 0.01-1%, wherein the coarse whiting powder is formed by conducting high energy ball milling on limestone mines and calcite, and the sedimentation inhibition component is one or two of spherical SiO2 with the particle size of 50-200 nm and light calcium carbonate. The viscosity reinforcing agent further has the water reducing function while the technical problems of bleeding, slurry floating and the like of a cement-based composite material are solved, the usage amount of the water reducing agent of the cement-based composite material is decreased, the usage amount of the viscosity reinforcing agent can be adjusted according to different air temperatures and different construction applications to meet the construction requirements, and the viscosity reinforcing agent has the advantages of being wide in application range and convenient to use.

Description

technical field [0001] The patent of the invention belongs to the field of building materials, and in particular relates to a cement-based composite material including special viscosity enhancers such as cement grout (agent), grouting material, self-leveling mortar and self-compacting concrete. Background technique [0002] Because of its unique economic and technical advantages, cement-based composite materials are becoming more and more widely used in the field of engineering construction and maintenance. Prestressed tunnel pressure grout, self-leveling mortar, early-strength grouting material, self-compacting concrete, etc. play an important role in their respective fields of use. Huge effect. In addition to self-leveling and vibration-free requirements, the above-mentioned composite materials have higher requirements for bleeding, laitance, surface air bubbles, and stability. Relevant domestic standards have strict regulations on the stability of cement-based composite ...

AI Technical Summary

Problems solved by technology

[0003] In order to achieve the purpose of zero bleeding and no laitance, it is usually achieved by adding water-retaining components or viscosity-modifying materials in China. For example, CN 102060468 B discloses a grouting admixture, using water-retaining components such as hydroxypropyl distarch One of phosphate esters or phosphorylated distarch phosphate and one of sodium carboxymethyl cellulose, hydroxyethyl methyl cellulose, hydroxypropyl methyl cellulose or polyvinyl alcohol are compounded according to the same mass ratio During the grouting process, the cement slurry bleeds. This method has problems such as poor adaptability and poor anti-bleeding. The effect of some cement with large cement particles and low tricalcium aluminate content is not obvious.

Aiming at the problems of self-compacting concrete bleeding, laitance and surface air bubbles, domestic scholars have done research and achieved certain results. For example, CN 104829160 A discloses a special viscosity-modified material for CRTS III-type plate self-compacting concrete. However, it is difficult to make adjustments according to changes in sand and stone after the addition of the viscosity-modified material is fixed during use. Once the fluidity becomes poor, it can only be adjusted by increasing the amount of water reducing agent or water, and it does not have the function of reducing water.

At the same time, the viscosity-modified materials disclosed in the above-mentioned patents do not have the function of adjusting the setting time of concrete, especially under low or high temperature construction conditions, it is difficult to ensure normal construction

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