Alkali-free setting accelerator containing coagulation and early-strength accelerator and organic amine substance and preparation method thereof

Abstract

The invention discloses an alkali-free setting accelerator containing a coagulation and early-strength accelerator and an organic amine substance and a preparation method thereof. The alkali-free setting accelerator is characterized by comprising the following raw materials in percentages by mass: 35% to 50% of aluminum sulfate, 3% to 15% of magnesium sulfate, 0 to 15% of sodium fluoride, 0.125% to 0.5% of the organic amine substance, 1% to 5% of a thickening agent and 1% to 5% of a stabilizing agent, with the balance being water, wherein the mass percents of the components sum to 100%; and the organic amine substance is any one selected from the group consisting of triisopropanolamine, diethanolisopropanolamine and tetrahydroxyethyladipicdiamide. The preparation method comprises steps ofbatching, raw material mixing under stirring, and formation of a uniform and stable system. The alkali-free setting accelerator provided by the invention is alkali-free, has good cohesiveness, low resilience value, high later strength retention rate and moderate cost, can be extensively applied to construction of tunnels, culverts, sinking and driving engineering, etc., can realize large-scale industrial production, and has strong strong practicability.

Description

technical field [0001] The invention belongs to concrete admixtures used as building materials, and relates to an alkali-free setting accelerator containing an organic amine substance of a setting accelerator and an early strength agent and a preparation method thereof. The non-alkali accelerator containing coagulation accelerator and organic amine is especially suitable as an accelerator in shotcrete, and can be widely used in the initial support of railway and highway tunnels, water diversion culverts, mine shafts, and underground projects. Protection and final lining, repair and reinforcement of damaged works, foundation and slope works, thin shell structures and demolition works, etc. Background technique [0002] Shotcrete does not need or only needs a single-sided formwork, and can make thin-walled structures in any direction. The process is simple, convenient and flexible, and has wide practicability; The time required for the slurry to become solid; initial setting ...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the main components of traditional accelerators are alumina clinker, carbonate, sodium silicate and other inorganic salts. Although this accelerator can basically meet the engineering requirements for setting time and early strength, but This quick-setting agent is strongly alkaline, and the presence of strong alkali can easily cause alkali-aggregate reaction, causing damage to the concrete structure, and the strength loss in the later period is generally 30% to 40%, which cannot fully meet the construction requirements. Alkaline is too strong, which poses a certain threat to the health of construction workers, and has a strong corrosive effect on human skin

In order to improve this problem, some researchers added triethanolamine and partially saponified polypropylene amine to the traditional alkaline accelerator to shorten the setting time and improve the early strength of concrete. High, the 28-day strength retention rate of concrete does not increase significantly

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