High-performance polycarboxylate superplasticizer for pipe piles

Abstract

The invention discloses a high-performance polycarboxylate superplasticizer for a tubular pile. The high-performance polycarboxylate superplasticizer is a mixture of the following raw materials in parts by weight: 70-85 parts by weight of isopentenol ethoxylate, 10-15 parts by weight of 2-phenylacrylic acid, 1-5 parts by weight of hydrogen peroxide, 0-1 part by weight of thiohydracrylic acid and 0.5-2 parts by weight of ascorbic acid. The high-performance polycarboxylate superplasticizer is prepared by the steps: mixing the raw materials, reacting in a redox reaction system, controlling the temperature to be 55-65 DEG C, and performing fractional distillation and removing impurities to obtain the high-performance polycarboxylate superplasticizer after the reaction is completed. According to the high-performance polycarboxylate superplasticizer, a branched chain with a benzene ring group is introduced in a synthesizing or weighing procedure of polycarboxylic acid, and thus the length of the branched chain is increased; and higher dispersing capacity is obtained, the solidification of cement paste is delayed, and the influence on slump maintaining performance is reduced when the high-performance polycarboxylate superplasticizer is used in cement.

Description

technical field [0001] The invention relates to a high-performance polycarboxylate water reducer for pipe piles, belonging to the technical field of cement water reducers. Background technique [0002] Pipe piles are widely used in the construction of railways and bridges. When preparing concrete for pipe piles, water reducing agents need to be added to the cement raw materials. At present, most of the existing polycarboxylate water-reducers are synthesized by acrylic acid and acrylic esters. Their main function is to pursue high water-reducing rate, but they ignore the slump retention performance and the impact on concrete when used in concrete later. The influence of ease. Due to the high water-reducing rate of the existing water-reducing agent, it is very easy to cause the bottoming phenomenon in the pumping of pipe piles. In most construction sites, pipe pile enterprises cannot use a large amount of retarders to reduce slump loss. Adjustment, this kind of water reducer...

AI Technical Summary

Problems solved by technology

At present, most of the existing polycarboxylate water-reducers are synthesized by acrylic acid and acrylic esters. Their main function is to pursue high water-reducing rate, but they ignore the slump retention performance and the impact on concrete when used in concrete later. The effect of workability

Due to the high water-reducing rate of the existing water-reducing agent, it is very easy to cause the bottoming phenomenon in the pumping of pipe piles. In most construction sites, pipe pile enterprises cannot use a large amount of retarders to reduce slump loss. Adjustment, this kind of water reducer with high water reduction and low slump protection cannot guarantee the slump maintenance within half an hour, and is not suitable for pipe pile companies

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