A kind of concrete viscosity reducer and preparation method thereof

Abstract

The invention provides a concrete viscosity reducer. A method comprises steps as follows: an MAH-PEG (maleic anhydride-polyethylene glycol) solution is synthesized; 500.0 parts of PEG are added to a four-neck flask, heated to 50 DEG C and started to be stirred, 86.0 parts of MAH are added, 0.1 parts of hydroquinone and 0.9 parts of a catalyst are sequentially added, the mixture is heated to 70-80DEG C and constantly stirred to react for 3-4 h, and a yellow or red solution, namely, the MAH-PEG solution is obtained after the esterification reaction. The concrete viscosity reducer has certain water reduction performance and good viscosity reduction effects and can be blended into concrete at a low water-binder ratio to notably reduce the viscosity of the concrete without affecting the flowability of concrete, and the pumping construction performance is improved; the concrete viscosity reducer is low in doping amount, has higher cost performance than a silica fume admixture, and no negative influence is caused to the strength of concrete; the concrete viscosity reducer is compounded with concrete admixtures such as ordinary polycarboxylate superplasticizer products and the like, has good compatibility and stability and cannot have layering or flocculation phenomenon.

Description

technical field [0001] The invention relates to the technical field of concrete viscosity reducer, in particular to a concrete viscosity reducer and a preparation method thereof. Background technique [0002] With the rapid development of the construction industry and the increase of our country's infrastructure, the scale of civil engineering has expanded unduly, the amount of concrete has also continued to increase, and the requirements for concrete have also increased. The continuous emergence of some high-rise, long-span, and important buildings with special functional requirements, such as skyscrapers, super-long-span bridges, and giant water conservancy projects, requires concrete to have higher strength, better durability, and better Stability, these requirements have led to the gradual development of concrete from ordinary to high performance and even ultra-high performance. However, the improvement of concrete strength is mainly achieved by increasing the amount of...

AI Technical Summary

Problems solved by technology

But at present, most of the viscosity reducers on the market have the following problems: incompatibility with polycarboxylate superplasticizers, delamination or flocculation, and even reduce the fluidity of concrete, and adversely affect the strength of concrete in the later stage; The preparation process is complicated, the reaction conditions are harsh, and it is difficult to realize mass production and application; the raw materials of large monomers are not easy to obtain; the synthesis cost is high

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