Liquid cement grinding additive

Abstract

The invention provides a liquid cement grinding additive, which comprises the following components in percentage by weight: 10 to 20 percent of tetrahydroxyethyl-ethylenediamine, 10 to 20 percent of ethoxyl-diethylenetriamine, 10 to 15 percent of diethylene glycol, 5 to 10 percent of polyethylene glycol, 2 to 5 percent of sodium tripolyphosphate, 3 to 5 percent of calcium lignosulphonate, 0 to 10 percent of tri-isopropanolamine, 0 to 8 percent of sodium gluconate, and the balance of water, wherein the molecular weight of the polyethylene glycol is between 200 and 400. As a preferred scheme of the invention, the content of the tri-isopropanolamine is between 5 and 10 percent, and the content of the sodium gluconate is between 5 and 8 percent. A cement and concrete admixture using the liquid cement grinding additive has good adaptability, can significantly improve the grinding efficiency of a grinding machine and improve the strengths of the cement in an early period and a later period by 2 to 4 MPa, or can reduce the clinker dosage by 4 to 8 percent and increase the adding volume of a mixed material by 4 to 8 percent in the cement under a condition of keeping the same cement strength grade.

Description

technical field [0001] The invention relates to a liquid cement grinding aid, which belongs to the field of cement production. Background technique [0002] At present, cement grinding aid products have two forms: powder and liquid. Because the liquid product is easy to use, it can be added smoothly only by adding a storage tank and a liquid metering pump, and does not require complicated and heavy equipment, so it has gradually been widely used. Multifunctionality is the development trend of liquid cement grinding aids: (1) the dosage is low (not more than 0.5%), (2) it can improve the grinding efficiency of the mill by 10-15%, and it can maintain the same cement Under the condition of strength level, reduce the consumption of cement clinker by 4% to 8%, and add 4% to 8% more admixtures. (3) The performance of cement and the adaptability of cement and concrete admixtures will not be affected. Specifically, it is required that the use of grinding aids does not affect the w...

AI Technical Summary

Problems solved by technology

The poor adaptability of cement and concrete admixtures using grinding aids will not only cause commercial concrete enterprises to add more concrete admixtures, increase the cost of commercial concrete enterprises, but also make it difficult to control the quality of concrete

A considerable part of the liquid multifunctional grinding aids on the existing market are mixed with various inorganic and organic salt early strength agents, which often cause an increase in the water consumption (that is, the water demand) of the standard consistency of the cement, thereby affecting the downstream concrete. The adaptability of the admixture (expressed as the loss of the fluidity of the cement paste per unit time or the loss of the concrete slump is increased), which affects the construction of the concrete and the quality of the concrete

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