Special plastic expansion agent for cement-based grouting material and preparation method of same

Abstract

The invention discloses a special plastic expansion agent for cement-based grouting material. The special plastic expansion agent comprises the components by weight percent: 3.0% to 5.0% of plastic expansion source, 0.05% to 0.15% of stearate, 5.0% to 10.0% of catalyst, 25.0% to 50.0% of quick lime and 35.0% to 60.0% of water retaining admixture. The special plastic expansion agent can hydrolyze and give off gas during the initial stage of cement hydration, and the gas which is given off uniformly enables cement slurry to expand slightly in volume, so that settling and cracking of grouting material can be avoided, and the slurry is ensured denseness and fullness. When the special plastic expansion agent is used with efficient water reducer or other admixtures, the purpose of efficiently ensuring that the plastic expansion of cement-based grouting material is greater than 0.1% in 3h under the condition of realizing the fluidness, the strength and the durability of the cement-based grouting material can be achieved, and expansibility that the expansion difference between 3h and 24h is greater than two ten thousandth and smaller than five thousandths can be achieved, so that plastic expansion of the cement-based grouting material can be realized.

Description

Technical field [0001] The present invention is the field of building material technology and involves a cement modified agent prepared by conventional craftsmanship. Specifically, it is a dedicated plastic expansion agent for cement grouting materials. Background technique [0002] Cemental grouting material originated in the United States and has a history of more than 40 years.Because the material has the advantages of good liquidity, no shrinkage, early strength and high strength, during the installation process, it can be smoothly irrigated into the narrow gap under the bottom plate of the device.While shortening the equipment installation cycle, the service life of the equipment can be extended, and its application scope has gradually expanded to the anchoring of bolt, structural reinforcement, and pavement repair.The research and application of cement grouting materials in my country has been nearly 20 years.With the continuous development of my country's national economy,...

AI Technical Summary

Problems solved by technology

[0004] Within 1 to 3 hours, the general grouting materials are in the plastic stage and have not yet finalized. Therefore, among the commonly used concrete expansion agents, even if the new type of calcium aluminate-calcium sulfoaluminate-calcium oxide expansion agent with excellent expansion performance is used The micro-expansion of cement paste in the plastic stage cannot be realized; the traditional metal powder expansion agent has a fast reaction speed, a large gas volume, large pores, and uneven gas generation, causing tiny cracks to form inside, which is not conducive to the development of concrete strength and durability , so traditional metal powder expansion agents have been prohibited from being used in grouting materials as expansion sources in the plastic stage

Images