A kind of calcium silicate hydrate accelerator and preparation method thereof

Abstract

The invention relates to the technical field of building materials, in particular to a calcium silicate hydrate early strength agent and a preparation method thereof. The preparation method of calcium silicate hydrate early strength agent comprises the following preparation steps: 1) preparation of calcium liquid; 2) preparation of silicon liquid with silicate as silicon source; 3) synthesis of calcium silicate hydrate: polyoxo The dispersant solution compounded with ethylene (5) nonylphenyl ether and cyclohexane was placed in a shear stirring mixing device, kept stirring at room temperature, and added the prepared calcium liquid and silicon liquid, and then used alkaline The solution adjusts the pH value of the mixed solution, maintains constant temperature and stirs, and obtains white calcium silicate hydrate gel; washes the obtained white calcium silicate hydrate gel by centrifugation, and then dries in a vacuum drying oven to obtain hydrated silicic acid Calcium early strength agent. After the calcium silicate hydrate accelerator prepared by the above preparation method is mixed into cement, it can promote the hydration of cement, significantly shorten the setting time of cement, and improve its early strength at the same time, which has important practical application value in the field of construction.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a calcium silicate hydrate early strength agent and a preparation method thereof. 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 for the strength of concrete prefabricated components. Therefore, how to improve the early strength of concrete prefabricated components is the key to technology. Calcium Silicate Hydrate CaO·SiO 2 ·nH 2 O(C-S-H), as the most important hydration product in cement-based materials, is also the most important source of improving the strength of concrete. [0003] Patent CN 108249806 A discloses a preparation method of calcium silicate hydrate early strength agent and a self-compacting concrete. The combination of methyl ammoni...

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Problems solved by technology

However, the above-mentioned scheme is still insufficient in shortening the setting time of cement. The 1d compressive strength test is only 12.6MPa, which is still unable to adapt to the rapid development of the current construction industry.

[0004] Existing methods for preparing calcium silicate hydrate, such as the hydrothermal method, often need to use a reactor as a reaction vessel, and the reaction needs to be carried out under high temperature and high pressure conditions, and the energy consumption is also high; the precipitation method takes too long and the benefit is not high

[0005] In addition, the calcium silicate hydrate particles in the calcium silicate hydrate early strength agent prepared by the prior art are prone to uneven mixing and agglomeration, resulting in too large a particle size of the calcium silicate hydrate particles, poor dispersion, and reduced silicon hydrate. The performance effect of calcium acid

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