Hydrated calcium silicate early strength agent and preparation method thereof

Abstract

The invention relates to the technical field of building materials, in particular to a hydrated calcium silicate early strength agent and a preparation method thereof. The preparation method of the hydrated calcium silicate early strength agent comprises the following preparation steps of: 1) preparing calcium solution; 2) preparing silicon liquid by taking silicate ester as a silicon source; 3) synthesis of hydrated calcium silicate: placing dispersant solution prepared by compounding polyoxyethylene (5) nonyl phenyl ether and cyclohexane into a shearing and stirring mixing device, keeping stirring at room temperature, adding prepared calcium solution and silicon solution, adjusting the pH value of mixed solution by using alkaline solution, stirring at constant temperature to obtain whitehydrated calcium silicate gel; centrifugally washing obtained white hydrated calcium silicate gel, and drying in a vacuum drying box to obtain the hydrated calcium silicate early strength agent. After the hydrated calcium silicate early strength agent prepared by the preparation method is mixed with cement, the hydration of cement can be promoted, the setting time of cement is obviously shortened, the early strength of cement is improved, and the hydrated calcium silicate early strength agent has important practical application value in the building field.

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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