Graphene modified concrete retarder and preparation method thereof

A technology of graphene modification and retarder, which is applied in the field of concrete admixtures, can solve the problems of low early strength of concrete, achieve good retardation effect, improve frost resistance performance, and improve the effect of later strength

Active Publication Date: 2020-05-08
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The early strength of concr

Method used

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  • Graphene modified concrete retarder and preparation method thereof
  • Graphene modified concrete retarder and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] A graphene modified concrete retarder, comprising the following components in parts by weight: 30 parts of graphene, 25 parts of tetrasodium edetate, 20 parts of calcium formate, 15 parts of calcium bromide, 10 parts of urea .

[0023] Preparation method: mix tetrasodium edetate and graphene evenly, add to 200ml of water, stir at 400-600rpm for 2min, and then ultrasonically disperse for 6min to obtain the mixture. The obtained mixture is mixed with calcium bromide, urea and calcium formate and ground evenly.

Embodiment 2

[0025] A graphene-modified concrete retarder, comprising the following components in parts by weight: 30 parts of graphene, 20 parts of tetrasodium edetate, 15 parts of calcium formate, 15 parts of calcium bromide, 20 parts of urea .

[0026] Preparation method: mix tetrasodium edetate and graphene evenly, add to 200ml of water, stir at 400-600rpm for 2min, and then ultrasonically disperse for 6min to obtain the mixture. The obtained mixture is mixed with calcium bromide, urea and calcium formate and ground evenly.

Embodiment 3

[0028] A graphene modified concrete retarder, comprising the following components in parts by weight: 35 parts of graphene, 15 parts of tetrasodium edetate, 15 parts of lithium formate, 15 parts of calcium bromide, 20 parts of urea .

[0029] Preparation method: mix tetrasodium edetate and graphene evenly, add to 200ml of water, stir at 400-600rpm for 2min, and then ultrasonically disperse for 6min to obtain the mixture. Mix and grind the obtained mixture with calcium bromide, urea and lithium formate evenly.

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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 ...

Claims

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Application Information

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IPC IPC(8): C04B24/12C04B103/22
CPCC04B40/0039C04B2103/22C04B22/02C04B24/121C04B24/04C04B22/124C04B24/126
Inventor 蒋林华贲询钦孟远远靳卫准陈磊
Owner HOHAI UNIV
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