Graphene modified concrete retarder and preparation method thereof

Abstract

The invention belongs to the technical field of concrete admixtures, and relates to graphene modified concrete retarder and a preparation method thereof. The retarder disclosed by the invention is prepared from the following components in parts by weight: 10 to 40 parts of graphene, 5 to 35 parts of ethylenediamine tetraacetic acid salt, 10 to 30 parts of formate, 10 to 35 parts of calcium bromideand 10 to 20 parts of urea. The retarder has the characteristics that the concrete setting time is delayed, the concrete strength increasing speed is increased, and the strength of concrete at all ages is improved.

Description

technical field [0001] The invention belongs to the concrete admixture technology, in particular to a graphene-modified concrete retarder and a preparation method thereof. Background technique [0002] A set retarder is an admixture that prolongs the setting time of concrete. Retarders can slow down the setting rate of concrete and reduce the early strength of concrete. Due to the effect of the retarder, during the cement hydration period, the diffusion and sedimentation rate of clinker minerals are reduced, which slows down the formation rate of hydration products, weakens the early hydration degree of concrete, and reduces the early strength. However, the hydration reaction of concrete after setting has not been significantly weakened, and the later strength growth rate of concrete is almost the same as that without retarder. [0003] In ready-mixed concrete, in order to prevent the slump loss of concrete with long-distance transportation or long intervals, the retarder ...

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Problems solved by technology

[0004] The early strength of concrete mixed with retarder is very low

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