Early strength agent and application thereof in concrete material

Abstract

The invention discloses an early strength agent and application thereof in a concrete material. The early strength agent comprises the following components in parts by weight: 30-50 parts of magnesiumfluosilicate, 14-20 parts of lithium sulfate, 15-25 parts of sodium sulfate, 15-25 parts of sodium nitrite and 55-75 parts of pre-hydrated cement particles. The preparation method of the pre-hydratedcement particles comprises the following steps: uniformly stirring 80-120 parts by weight of cement and 20-40 parts by weight of water, granulating, maintaining for 28-30 days, carrying out ball milling, and screening with a 200-300-mesh sieve to obtain the pre-hydrated cement particles. The performance of the early strength agent can be remarkably improved and the hardening time can be shortenedby the self-making pre-hydrated cement particles and combining the pre-hydrated cement particles with other components, and the early strength agent has a remarkable effect of enhancing the later strength of a cement base material, does not shrink and meets the requirements on the service strength and durability of concrete.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to an early strength agent and its application in concrete materials. Background technique [0002] With the development of urban infrastructure construction, the construction of prefabricated houses, urban subway tunnels and other engineering projects is booming. Such projects with fast construction progress have higher requirements on the strength of concrete prefabricated components. Therefore, how to improve the early strength of precast concrete components is the key to the technology. [0003] Early-strength admixture is one of the admixtures of concrete and concrete-based materials. It refers to the admixture that can improve the early strength of concrete and concrete-based materials, and has no significant effect on the later strength. Its mechanism of action is to accelerate the hydration rate of cement and provide cement cementing components, thereby promotin...

AI Technical Summary

Problems solved by technology

So far, the existing technology has developed a variety of early-strength admixtures other than chloride and sulfate, such as nitrite, chromate, etc., and organic early-strength agents, such as triethanolamine, calcium formate, urea etc., but most of them have problems such as complex preparation process, high cost, and poor environmental adaptability. At the same time, the early strength of cement early strength agents in the prior art is not greatly improved, the hardening time is slow, and the problem of later strength is not taken into account.

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