Modified polycarboxylate water reducer capable of improving strength of concrete

Abstract

The invention discloses a modified polycarboxylate water reducer capable of improving strength of concrete. The modified polycarboxylate water reducer is prepared from, by weight, 240-250 parts of TPEG, 25.2-26.0 parts of acrylic acid, 1.6-1.65 parts of ammonium persuflate, 0.53-0.55 parts of thioglycolic acid, 13-14 parts of lignin, proper amounts of sodium hydroxide solution of 10wt% in concentration and deionized water, 26-28 parts of grapheme oxide, 2.5-3 parts of sodium pyrophosphate, 2-3 parts of waterborne epoxy resin, 8-10 parts of nano alumina, 5-6 parts of carbide slag, 2-3 parts of microcrystalline wax and 3-4 parts of sodium citrate. The modified polycarboxylate water reducer is scientific and reasonable in ingredient proportion, the water reducer which is prepared from a series of processing steps is high in water reducing rate and good in dispersity in the concrete, early strength and later strength of the concrete are improved obviously, and the water reducer is excellent in working performance, high in durability and low in bleeding rate and has good economic benefit and social benefit.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a modified polycarboxylate water reducer capable of improving concrete strength. Background technique [0002] Polycarboxylate high-performance water-reducing agent is an important component material for preparing high-performance concrete. It is widely used in high-speed railways, bridges, Nuclear power, hydropower and other key projects. However, the performance of the mother liquor of polycarboxylate high-performance water reducer is relatively single, which cannot meet the needs of concrete in different engineering fields and different performance requirements, which greatly restricts the wide application and development of polycarboxylate high-performance water reducer. Experts and scholars at home and abroad have conducted systematic research on polycarboxylic acid-based high-performance water reducers through chemical and physical modification methods, and hav...

AI Technical Summary

Problems solved by technology

However, problems such as bleeding, segregation, low strength, and cracks are prone to occur during the production of concrete, which affects the use of water reducing agents. These shortcomings are not explained in the article, and further modification is required.