Accelerator for concrete and preparation method thereof

Abstract

The invention discloses an early strength agent used for concrete, and a preparation method of the early strength agent. The early strength agent is prepared from, by weight, 25-30 parts of CaO, 20-25 parts of Al2O3, 10-20 parts of MgO, 2-5 parts of ZrO2, 3-6 parts of CaSO4, 10-15 parts of celestine powder, 10-15 parts of bentonite powder, 5-9 parts of endellite powder, 0.4-0.7 parts of La2O3, 0.3-1.5 parts of Ta2O5, 1-3 parts of Li2CO3, 0.1-0.3 parts of NaCl and 0.1-0.3 parts of KCl. The preparation method comprises the following steps: carrying out ball milling above raw materials, calcining the ball-milled raw materials at 700-800 DEG C, and carrying out ball milling on the calcined raw materials, calcium aluminum hydrotalcite and other reagents in order to obtain the early strength agent used for concrete. The early strength agent used for concrete has the advantages of good early strength effect, high strength and low temperature low, and is a concrete additive with good prospect.

Description

technical field [0001] The invention relates to an accelerator for concrete and a preparation method thereof, belonging to the technical field of concrete admixtures. Background technique [0002] With the rapid development of the economy, the role of concrete in construction has become more and more important, which virtually puts forward higher and higher requirements for concrete. In order to improve the performance of concrete and meet the needs of concrete construction, those skilled in the art often use the method of adding concrete admixtures to concrete. Among them, the commonly used concrete admixtures include water reducing agent, retarder, early strength agent, waterproofing agent and so on. [0003] The early strength agent is an admixture that can accelerate the hydration rate of cement and increase the early strength of concrete without significantly affecting the later strength. According to the chemical composition, it is mainly divided into inorganic early...

AI Technical Summary

Problems solved by technology

Although it can achieve a certain early strength effect, it is still unsatisfactory in terms of concrete application, especially in terms of concrete strength.

In addition, its calcination temperature is relatively high at 1250-1400°C, which increases the production cost virtually and restricts the development of accelerators to a certain extent.

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