A kind of normal temperature synthetic early-strength type liquid alkali-free accelerator and preparation method thereof

Abstract

The invention relates to an early strength type liquid alkali-free setting accelerator synthesized at normal temperature and a preparation method of the setting accelerator. The setting accelerator iscomposed of the following components in percentages by mass: 60-80% of a modified polyaluminum sulfate solution, 1-3% of graphene oxide, 1-5% of a stabilizer, 1-5% of a performance modifier, and thebalance of water. When the early strength type liquid alkali-free setting accelerator synthesized at the normal temperature provided by the invention is added into concrete, final strength is not affected while early strength of the concrete is rapidly developed, and the possibility of generating an alkali-aggregate reaction can be greatly reduced; moreover, when the setting accelerator is added into Portland cement with different brands, construction requirements of sprayed concrete are met; and the setting accelerator also has the advantages of low-temperature resistance, high rapid setting,a low mixing amount, no (low) corrosion, stable long-term storage performance, reasonable price and the like, and has excellent comprehensive performance and good economic benefits.

Description

technical field [0001] The invention belongs to the technical field of cement concrete additives, and in particular relates to a normal-temperature synthetic early-strength liquid alkali-free accelerator and a preparation method thereof. Background technique [0002] Accelerator is an admixture that makes concrete harden and set quickly, and is mainly used in the construction of sprayed concrete. Traditional quick-setting agents generally have strong alkalinity. Although they can meet the requirements of shotcrete, they also bring many problems: the strength retention rate of shotcrete is low in the later stage, which damages the health of construction workers and increases the occurrence of alkali bone in concrete. The probability of material reaction will lead to the decline of concrete strength and durability in the later stage. [0003] In order to overcome the above defects, non-alkali liquid accelerators have become the main direction of accelerator development in the...

AI Technical Summary

Problems solved by technology

Traditional quick-setting agents generally have strong alkalinity. Although they can meet the requirements of shotcrete, they also bring many problems: the strength retention rate of shotcrete is low in the later stage, which damages the health of construction workers and increases the occurrence of alkali bone in concrete. The probability of material reaction will lead to the decline of concrete strength and durability in the later period

The setting time of the quick-setting agent invented by Jiangsu Aolite New Material Co., Ltd. in the published patent (patent application number: 201410742161.8) still has a lot of room for improvement, and the strength loss is relatively large in the later stage

The published patent of Xuzhou Jiulong Synthetic Materials Factory (patent application number: 201310700044.0) has a large loss of strength in the later stage of the accelerator, and the magnesium fluorosilicate used in the accelerator is toxic, which is not conducive to large-scale promotion and use

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