Tannin extract/polycarboxylate concrete water reducer and preparation method thereof

Abstract

The invention discloses a tannin extract / polycarboxylate concrete water reducer. The tannin extract / polycarboxylate concrete water reducer is prepared from the following raw materials by weight: 2 to 4 parts of polyvinyl alcohol, 3 to 5 parts of tannin extract, 4 to 6 parts of hydrogen peroxide with a concentration of 20 to 30%, 0.1 to 0.2 part of polysorbate-80, 40 to 50 parts of modified polycarboxylate mother liquor, 1 to 2 parts of sodium humate, 1 to 2 parts of sorbitol, 0.2 to 0.4 part of polyoxyethylene nonyl phenyl ether and 40 to 50 parts of water. The water reducer has good compatibility with cement, is small in doping amount and high in a water reducing rate, can improve the bonding strength of cement, strengthen the compression resistance and fracture resistance of concrete and enhance the strength of concrete, effectively prevents corrosion of steel bars in concrete, prolongs the service life of the steel bars, and has a high practical value.

Description

technical field [0001] The invention relates to the technical field of chemical additives, in particular to a tannin extract / polycarboxylate concrete water reducer and a preparation method thereof. Background technique [0002] Concrete water reducer is one of the important products in the building materials industry. Adding water reducer to the concrete mixture can disperse the cement particles, improve the fluidity of the concrete mixture, reduce the amount of cement per unit, save cement, and ensure Workability and strength of concrete. At present, the commonly used water reducers mainly include lignin sulfonate, naphthalene water reducer and polycarboxylate water reducer. Polycarboxylate superplasticizer has the advantages of high water reducing rate, remarkable reinforcement effect, good workability of concrete, and environmental protection. It is the most promising superplasticizer in recent years. However, in the actual use of concrete engineering, there is a proble...

AI Technical Summary

Problems solved by technology

However, in the actual use of concrete engineering, the polycarboxylate water reducer has a problem of compatibility with cement, and its use effect is greatly affected by the composition of cement.

Especially when it contains clay and other ingredients, due to the interlayer adsorption effect of clay, it has a serious impact on the water-reducing and dispersing performance of polycarboxylate superplasticizers, which reduces the working performance of concrete and restricts the wide application of polycarboxylate superplasticizers. And development

Moreover, at present, the development of domestic polycarboxylate water reducer products is not yet mature, and there are few varieties, which are difficult to meet the functional and diversified market demand, and further development and improvement are needed.