Chloride-free alkali-free liquid setting accelerator and preparation method thereof

Abstract

The invention discloses a chloride-free alkali-free liquid setting accelerator and a preparation method thereof. The preparation method of the chloride-free alkali-free liquid setting accelerator comprises the following steps: preparing aluminum fluosilicate for later use; mixing the aluminum fluosilicate with water, and performing a stirring reaction so as to obtain an aluminum fluosilicate solution; adding aluminum sulfate octadecahydrate into the aluminum fluosilicate solution, and performing continuous stirring so as to obtain a stirring liquid; sequentially adding a stabilizer, a surfactant and the rest of water into the stirring liquid, performing a stirring reaction, and performing cooling to the room temperature, so as to obtain the liquid setting accelerator. The liquid setting accelerator disclosed by the invention is free of chloride or alkali, so that the problems that concrete has large later strength loss, has serious corrosiveness and causes environment pollution becauseof strong basicity of a conventional setting accelerator can be solved; in addition, the liquid setting accelerator is easy in raw material obtaining, low in price, simple in preparation method, lowin production cost and mild in condition, the glue-sand performance of the obtained chloride-free alkali-free liquid setting accelerator in a doping amount of 6% is far greater than standard requirements, the one-day mortar strength is up to 7Mpa or greater, the later strength is barely lost, and the rebound rate is as low as 10% or lower.

Description

technical field [0001] The invention relates to the fields of building construction and building materials, in particular to a chlorine-free and alkali-free liquid quick-setting agent and a preparation method thereof. Background technique [0002] Concrete quick-setting agent is mainly used in the construction of shotcrete, generally used in tunnels, culverts, industrial and mining construction, when shotcrete is used, it is added at the nozzle to make it harden and solidify quickly. Traditional quick-setting agents generally have strong alkalinity. Although they can meet the requirements of shotcrete, they also bring many problems: shotcrete has a large loss of strength in the later stage and strong corrosion. In addition, it may cause environmental pollution, especially for groundwater. The environment is polluted, there is a lot of dust, the amount of rebound is large, and it is not convenient for sprayed concrete wet operation. [0003] In response to these problems of ...

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Problems solved by technology

[0005] In view of the problems existing in the prior art, the object of the present invention is to provide a chlorine-free and alkali-free liquid quick-setting agent and a preparation method thereof. The late stage strength loss of concrete brought about by corrosion resistance, strong corrosion and pollution to the environment; and the raw materials are easy to get, the price is low, the preparation method is simple, the production cost is low, the conditions are mild, and the obtained chlorine-free and alkali-free liquid is fast When the coagulant is added at 6%, the performance of the mortar far exceeds the standard requirements of GB / T35159-2017. The strength of the mortar reaches more than 7Mpa in one day, and the strength is basically not lost in the later period. The rebound rate is as low as less than 10%, and the shelf life is long.

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