Lignin-graphene oxide composite modified polycarboxylic acid efficient water reducing agent

Abstract

The invention discloses a lignin-graphene oxide composite modified polycarboxylic acid efficient water reducing agent. The water reducing agent is prepared by, by weight, 240-250 parts of TPEG, 25.2-26.0 parts of acrylic acid, 1.6-1.65 parts of ammonium persulfate, 0.53-0.55 part of thioglycolic acid, 13-14 parts of lignin, an appropriate amount of sodium hydroxide solution with the concentration being 10wt%, an appropriate amount of deionized water, 26-28 parts of graphene oxide, 20-23 parts of boiler slag, 5-7 parts of sorbitol, 2-3 parts of sodium nitrite, 2-3 parts of dodecyl dimethyl benzyl ammonium chloride, 4-5 parts of carbon black and 3-4 parts of microcrystalline wax. The lignin-graphene oxide composite modified polycarboxylic acid efficient water reducing agent has the advantages that components such as the carbon black and the dodecyl dimethyl benzyl ammonium chloride are added into the preparation of the water reducing agent, so that the dispersity of the water reducing agent in concrete can be increased; the industrial waste boiler slag is added into the water reducing agent, so that production cost is lowered; the sodium nitrite is added into the water reducing agent, and accordingly the early strength and later strength of the concrete are further increased.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a lignin graphene oxide composite modified polycarboxylic acid high-efficiency water reducer. 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 met...

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.