Low-doping-amount and high-performance alkali-free and chlorine-free liquid setting accelerator and preparation method thereof

Abstract

The invention provides a low-doping-amount and high-performance alkali-free and chlorine-free liquid setting accelerator and a preparation method thereof and belongs to the field of building materials. The setting accelerator is prepared from the following raw materials in percentage by weight: 30 to 60 parts of potassium sulfate, 0 to 20 parts of magnesium sulfate, 0.5 to 2.0 parts of precipitated magnesium silicate hydrate, 0.5 to 2.0 parts of magnesium oxide, 1 to 3 parts of magnesium fluosilicate, 1 to 3 parts of alkylol amine, 0.5 to 1.5 parts of a high polymer, 0.2 to 1.0 part of a stabilizing agent, 5 to 40 parts of a mother solution and 30 to 50 parts of water. The obtained liquid setting accelerator has the density of 1.3 to 1.5g / cm<3>, the pH (Potential of Hydrogen) value of 2.5to 3.5, the solid content of 37 to 45 percent and the alkali content of less than or equal to 1.0 percent. The alkali-free liquid setting accelerator provided by the invention has the advantage of nocorrosive and irritating odor, low doping amount, good adaptability to cement, rapid condensation speed and high strength and good stability; and the stabilization period reaches 180 days or more, thetechnology feasibility is strong and the liquid setting accelerator is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a low-volume high-performance non-alkali and chlorine-free liquid quick-setting agent and a preparation method thereof. Background technique [0002] Due to the characteristics of high construction efficiency, friendly construction environment and low springback, wet shotcrete is gradually replacing the traditional dry shotcrete. Liquid accelerators are mainly used in the preparation of shotcrete for high-speed rail, high-speed, and subway tunnel construction. Adding the accelerator to the sprayed cement mortar and concrete can not only accelerate the setting and hardening speed of the cement, but also improve the early strength, with little or even no influence on the later strength, and greatly improve the cohesion and bond strength of the concrete, and reduce the rebound The efficiency is improved, the economic benefit is improved, the alkaline cement dust in the air is redu...

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Problems solved by technology

[0003] Liquid accelerators for wet shotcrete include alkali, low-alkali, and alkali-free liquid accelerators. From the perspective of their development, the main problems are: high alkali content, large dosage, short stable period, 1d Low strength, 28d strength ratio less than 100%, etc.

Most of the research and development achievements are only in the laboratory stage. On the one hand, they do not meet the actual production requirements. On the other hand, due to the high price and large dosage, they cannot be marketed and productized. Coagulant and preparation method thereof, which discloses a non-alkali quick-setting agent mainly composed of aluminum sulfate, metal fluorides, and amines, adding a pH regulator and a thickening substance, and its adaptability to cement is relatively narrow, and Large amount

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