Fluorine-free high-early-strength liquid alkali-free accelerator as well as preparation method and application thereof

Abstract

The invention provides a fluoride-free liquid alkali-free accelerator as well as a preparation method and application thereof. The fluoride-free liquid alkali-free accelerator comprises the following raw materials in parts by weight: 450-600 parts of aluminum sulfate, 5-20 parts of a stabilizer, 25-150 parts of an organic complexing activator, 20-100 parts of alcohol amine, 0-10 parts of organic alcohol, 10-75 parts of an early strength agent, 0-10 parts of a neutralizer and deionized water. Wherein the organic complexing exciting agent is a high-molecular multipolymer which is obtained by carrying out redox initiation polymerization on unsaturated amide, unsaturated silane and unsaturated sulfonic acid monomers. The liquid alkali-free accelerator provided by the invention has the characteristic of rapid development of compressive strength in 6h and 1d, has the characteristics of no fluorine and chlorine, good stability, low mixing amount, fast coagulation, high later strength retention rate and the like, and can be widely applied to engineering construction such as railway tunnel and mine roadway support, repair and reinforcement, water prevention and leakage stoppage and the like.

Description

technical field [0001] The invention relates to the technical field of building material additives, in particular to a fluorine-free high-early-strength liquid alkali-free accelerator, a preparation method and application. Background technique [0002] With the massive construction of traffic tunnels, mine roadway support, repair and reinforcement, and waterproof and plugging projects, accelerators with rapid setting and hardening functions have become indispensable admixtures for modern shotcrete. At present, the liquid accelerators used in wet shotcrete are mainly alkali accelerators and alkali-free accelerators. Although the traditional alkaline accelerator can meet the construction requirements of shotcrete, it is easy to cause alkali-aggregate reaction due to its high alkali content and strong corrosiveness, resulting in large strength loss in the later stage, poor durability, high spray rebound, and serious dust pollution. and many other issues. Liquid alkali-free ac...

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Problems solved by technology

[0003] However, the liquid alkali-free accelerators currently on the market still have poor stability, high dosage, low 1d compressive strength, excessive alkali content, and the use of hydrofluoric acid (HF), fluorosilicic acid (H2SiF6) or fluorosilicate and other fluorine-containing toxic raw materials, etc.

Patent CN 201210495755.4 discloses a liquid alkali-free accelerator whose main components are aluminum sulfate, magnesium sulfate and magnesium fluorosilicate. The introduction makes it easy to form CaF in the early stage of cement hydration 2 , resulting in the wrapping of cement particles, hindering the C 3 The hydration of S leads to low early strength of cement stone, and the 6h strength is far from reaching; patent CN 109180053A discloses a low-rebound early-strength type liquid alkali-free accelerator and its preparation method. The ratio is modified aluminum sulfate solution 60-80%, graphene oxide 0.5-3%, stabilizer 1-5%, performance regulator 1-5%, penetrant 0.5-3%, pH buffer 0.1-1%, The balance is water

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