Rheological agent for replacing water reducer in low mass-ratio in cement-based system

Abstract

The invention provides a rheological agent for replacing a water reducer in a low mass-ratio in a cement-based system. The rheological agent is an aqueous solution of a solid-liquid composition, wherein the solid-liquid composition comprises the following raw materials in parts by weight: 35-45 parts of a stearate emulsion, 5-15 parts of an alkaline-resistant penetrant, 5-10 parts of a cationic monomer, 5-10 parts of an alcohol amine compound and 35-45 parts of a soap air entraining agent; the solid solution content proportion of the solid-liquid composition of the rheological agent in the aqueous solution is 6-20%; the solid solution content proportion of the water reducer thereof is also 6-20%; and the low mass ratio means that 1 part of the rheological agent and (n-1) parts of water can replace n parts of water reducer during replacement of the water reducer by the rheological agent in the same solid solution content proportion and at the same amount of admixture, and n is greater than or equal to 3 but less than or equal to 6. Differentiated from a thickener or a viscosity modifier, the rheological agent can weaken the high water reducing action of the water reducer, improve the rheological property of concrete and optimize the coating property and the stability of the concrete, and the performance advantages of the rheological agent are particularly obvious by using machine-made sand, superfine sand and a non-continuous graded coarse material.

Description

[0001] Technical field: [0002] The invention relates to the field of building materials, in particular to a rheological agent used for replacing water-reducing agents with low mass ratios in cement-based systems. [0003] Background technique: [0004] Concrete mixture is composed of cement, sand, stones, admixtures, mineral admixtures and water reducers, etc. During the process, due to the unreasonable design of particle gradation of different sizes, the inability of the hydrated cementitious material to provide a suitable viscosity, and the fact that the main chain of the water reducing agent is too short to wrap the cement particles, etc., all kinds of problems in the mixture will be caused. The components separate and the mixture becomes inhomogeneous and loses continuity. [0005] Patent CN 1385392 A relates to the application of a powder composition as a rheological additive in a cement-containing or cement-free building material composition, wherein the powder composi...

AI Technical Summary

Problems solved by technology

In view of this, the technical problem to be solved by the present invention is to solve the application status quo of poor workability of high-fluidity concrete due to factors such as unreasonable gradation of raw materials, difficulty in entraining air in materials, and too short main chain of superplasticizer molecules, and A single conventional polycarboxylate superplasticizer component cannot solve the high fluidity mixture while meeting the cohesion and water retention and other indicators, and builds a combination of lubricants, air-entraining agents, early-strength mineral dispersants-intercalants The rheological agent system that replaces the water reducer with a low mass ratio is the difficulty and key to the matching design of rheological agent multi-components