Low-cost concrete antifreezing pumping aid and preparation method thereof

Abstract

The invention relates to the concrete pumping aid field, in particular to a low-cost concrete antifreezing pumping aid and a preparation method thereof. The concrete pumping aid comprises the following raw materials by weight percent: 20-30% of polycarboxylic acid water reducing agent of which solid content is 40%, 0.3-0.4% of air entraining agent, 0.9-2% of retarder, 11-15% of sulfonated acetone-formaldehyde condensate of which solid content is 36%, 6-10% of sodium lignin sulfonate, 2-4% of antifreezing component and the balance of water. The preparation method comprises the following steps:adding water, air entraining agent, polycarboxylic acid water reducing agent and sulfonated acetone-formaldehyde condensate in a container to heat to 45-55 DEG C, and stirring evenly; adding sodium lignin sulfonate in the container to stir, centrifuging to remove precipitate; and adding retarder and antifreezing component to stir evenly. The low-cost concrete antifreezing pumping aid has good performance; the composite indicators such as the antifreezing property, the pumping property, the water reducing ratio and the ratio of compressive strength are better than that of the antifreezing pumping aid which uses polycarboxylic acid water reducing agent or sulfonated acetone-formaldehyde condensate alone; and the antifreezing pumping aid in the invention has higher adaptability and good costperformance.

Description

technical field [0001] The invention relates to the field of concrete pumping agent, in particular to a low-cost concrete antifreeze pumping agent and a preparation method of the pumping agent. Background technique [0002] Concrete pumping agent is an admixture used in concrete mixing and construction. It can increase the workability of concrete, so that the concrete mixture can pass through the pipeline smoothly, without blocking, without segregation, and with good viscoplasticity. Pumping agent is an admixture that must be used in modern concrete construction. For pumping construction in a normal temperature environment, only the pumping agent can be mixed, but in cold areas, the antifreeze performance of the concrete must also be considered when the construction is carried out at negative temperatures in winter. At this time, the antifreeze pumping agent is needed. It can give concrete good pumpability, and it can also make concrete have antifreeze performance. [0003...

AI Technical Summary

Problems solved by technology

In recent years, many domestic colleges and universities and production companies have conducted a lot of research on the synthesis and application of polycarboxylate superplasticizers, and mass production. The application of polycarboxylate superplasticizers is the development of green concrete admixtures. An important direction, the main problem at present is that the price is high, and the adaptability to air-entraining agents, antifreeze agents, retarders, etc. commonly used in naphthalene-based water reducers is not good

[0005] The sulfonated acetone-formaldehyde condensate has a high water-reducing rate, which is very beneficial to the increase of the early strength of concrete, but the fluidity loss is relatively large when preparing high-fluidity concrete, and the addition of a large amount of sulfonated acetone-formaldehyde condensate will make the The color of the concrete surface becomes darker, thus affecting its application and promotion

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