High-early-strength antifreezing polycarboxylic-acid composite water reducing agent and application thereof

Abstract

The invention relates to a high-early-strength antifreezing polycarboxylic-acid composite water reducing agent and application thereof, belonging to the field of construction materials. The invention aims to provide a high-early-strength antifreezing polycarboxylic-acid composite water reducing agent and application thereof. The high-early-strength antifreezing polycarboxylic-acid composite water reducing agent is prepared from the following raw materials in parts by weight: 17.5-32.5 parts of polycarboxylic-acid water reducing agent, 1-3 parts of sodium lignosulfonate, 7-36 parts of early-strength admixture, 2-8 parts of antifreezing agent, 0-0.5 part of air entraining agent and 20-72.5 parts of water. The early-strength admixture is composed of 1-8 parts by weight of organic early-strength component and 6-28 parts by weight of inorganic early-strength component. The high-early-strength antifreezing polycarboxylic-acid composite water reducing agent has the advantages of high early strength, favorable anti-freeze-thawing effect and the like.

Description

technical field [0001] The invention relates to an early-strength, antifreeze polycarboxylate composite water reducer and its application, belonging to the field of building materials. Background technique [0002] Polycarboxylate superplasticizer is the third-generation superplasticizer with excellent comprehensive performance. It has been produced and applied in Japan, Germany, the United States and other developed countries since the late 1980s. It has many advantages such as high water reducing rate, small loss of concrete slump over time, low dosage, great contribution to concrete strength, and good environmental protection. From high-speed railways to urban commercial concrete mixing stations, many domestic application companies have begun to choose polymer Carboxylic acid superplasticizer is an essential fifth component of concrete. [0003] On the one hand, due to the relatively short application and development time of polycarboxylic acid-based high-performance wat...

AI Technical Summary

Problems solved by technology

Its repeated occurrences cause serious damage to architectural structures

And only freezing without melting will also cause frost heave damage, resulting in cracking of the wall

The plaster falls off in pieces, and in severe cases, the wall can completely lose its bearing capacity and thermal insulation performance. The freeze-thaw cycle can cause severe weathering inside the building structure and lose its durability.

[0006] The application number is 201010571257.4, a low-cost concrete antifreeze pumping agent and its preparation method, which discloses a pumping agent with low cost and good antifreeze effect. However, its freeze-thaw resistance performance is not ideal. After freeze-thaw tests, Its mass loss rate is as high as 6%

The application number is 20071019297.2, a liquid, chlorine-free, early-strength antifreeze polycarboxylate composite water reducer and its preparation method, which discloses a chlorine-free, early-strength antifreeze polycarboxylate composite water reducer, but After the freeze-thaw test, the mass loss rate can only be controlled within the range of less than 5%.

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