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Preparation method of hydrated calcium silicate early strength agent and self-compacting concrete

A technology of self-compacting concrete and calcium silicate hydrate, which is applied in the field of building materials, can solve the problems of high production energy consumption, high price, and increased production cost of calcium silicate hydrate, and achieve the improvement of early strength and later strength, The effect of reducing production costs

Active Publication Date: 2018-07-06
镇江建科建设科技有限公司
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AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: at present, the preparation methods of calcium silicate hydrate mainly include hydrothermal method and chemical co-precipitation method. The early strength effect of calcium silicate; the silicon source used in the chemical co-precipitation method is silicon salt such as sodium silicate, and the calcium source is calcium salt such as calcium nitrate, calcium acetate or calcium chloride. These silicon salts and calcium salts are relatively expensive. Increased the production cost of calcium silicate hydrate; in the prior art, there is a lack of energy consumption and the method of reusing waste resources to prepare calcium silicate hydrate early strength agent at the same time

Method used

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  • Preparation method of hydrated calcium silicate early strength agent and self-compacting concrete

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Embodiment 1

[0039] Such as figure 1 , 2 Shown, a kind of preparation method of calcium silicate hydrate accelerator, the method comprises the following steps:

[0040] Get silicon source:

[0041] (1) Choose rice husk as the silicon source, and wash the rice husk repeatedly with distilled water for 3 to 5 times;

[0042] (2) Soak the washed rice husks in 0.5-1mol / L hydrochloric acid solution for 12-48 hours, wash the rice husks repeatedly until the solution is neutral, and then filter out;

[0043] (3) Dry the rice husks cleaned in step (2) in a blast drying oven at 100°C for 24 h;

[0044] (4) Put the acidified pretreated rice husk in step (3) into a box-type resistance furnace, heat up from 25°C to 400-800°C at a heating rate of 10°C / min, roast for 1 hour, take it out, and grind it to obtain white rice husk ash ;

[0045] The rice husk is fully burned in an oxidizing environment at 400-800°C, especially at 400-800°C. The rice husk ash contains less carbon, has a larger specific sur...

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Abstract

The invention relates to a preparation method of a hydrated calcium silicate early strength agent, and a steaming-free C30 self-compacting concrete prepared by using the early strength agent. According to the preparation method, acid treated waste rice husks and waste liquid of calcium lignosulfonate production are effectively utilized as raw materials, so that not only is energy saved and is environment protected, but also the production cost of the hydrated calcium silicate early strength agent is reduced; and the hydrated calcium silicate early strength agent prepared by using the acid treated waste rice husks and the waste liquid of the calcium lignosulfonate production has similar properties to a hydrated calcium silicate early strength agent prepared by using a silicon source such assodium silicate and a calcium source such as calcium nitrate, and both can effectively improve early strength and later strength of a cement-based material.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a preparation method of a calcium silicate hydrate accelerator and self-compacting concrete using the accelerator. Background technique [0002] In the production process of precast concrete components, in order to speed up the turnover rate of molds and improve production efficiency, steam curing and adding early strength agents are often used to improve the early strength of concrete, so as to shorten the demoulding time of precast concrete components. As the main product of cement hydration, calcium silicate hydrate is used as an early strength agent, which can provide nucleation sites for cement hydration, reduce the energy hindrance of hydration product precipitation, and promote the crystallization reaction. Thereby increasing the hydration rate of cement to improve the early strength of cement-based materials. [0003] At present, the preparation methods of calcium silic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C04B28/04C04B103/12
Inventor 蒙海宁左李萍张敏杰许彦明陆小军
Owner 镇江建科建设科技有限公司
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