Preparation method of early-strength high-efficiency alkali-free accelerator

Abstract

The invention discloses a preparation method of an early-strength high-efficiency alkali-free accelerator. The formula of the accelerator comprises basalt fibers, fluosilicic acid, light calcined magnesia, aluminum sulfate, polyacrylamide and triethanolamine, wherein the content of the basalt fibers is 3-5 parts, the content of the fluosilicic acid is 100 parts and is 10%-20%, the content of the light calcined magnesia is 10 parts and is not lower than 90%, the content of the aluminum sulfate is 40-50 parts, the content of the polyacrylamide is 1-2 parts, and the content of the triethanolamineis 3-5 parts. The fluosilicic acid in the raw materials is fluosilicic acid wastewater generated in the production process of a phosphate fertilizer plant, the fluosilicic acid wastewater of a phosphate fertilizer plant is subjected to waste utilization, so that the method solves the pollution discharge problem of phosphate fertilizer plants and is more environment-friendly. Meanwhile, the sprayed concrete strength and interlayer binding force are enhanced by adding basalt fibers into the accelerator, the working efficiency of tunnel sprayed concrete construction is enhanced, and the accelerator has far-reaching meanings for promoting sustainable development of China's environment and tunnel construction.

Description

technical field

[0001] The invention belongs to the related technical field of composite materials, and in particular relates to a preparation method of an early-strength and high-efficiency alkali-free accelerator. Background technique

[0002] Accelerator: an admixture that can be mixed into concrete to make the concrete set and harden quickly. The main types are inorganic salts and organic substances. Powdery solid, its dosage only accounts for 2% to 3% of the cement in concrete, but it can make the concrete set in 5 minutes, and the accelerator set in 12 minutes. In order to achieve the purpose of emergency repair or rapid condensation of concrete in the shaft. It is an indispensable additive in shotcrete construction method. Their function is to accelerate the hydration and hardening of cement and form sufficient strength in a short period of time to meet the requirements of special construction.

[0003] The existing quick-setting agent technology has the following...