Research progress on the influence of geopolymer grouting material properties

Abstract

Grouting technology is to inject slurry with cementing ability into the cracks and voids of the formation to achieve the purpose of reinforcement and filling. At present, cement-based materials are mainly used for grouting, which has the advantages of mature technology, cheap price, high stone strength and wide application, but there are also defects such as high-water separation rate, poor stability and long setting time. Most importantly, the production of cement materials consumes a lot of energy and emits a lot of CO2, which aggravates the global greenhouse effect and is not in line with the concept of sustainable development. In recent years, geopolymer materials based on volcanic ash and industrial waste residue have attracted extensive attention of scholars because of their green and environmental characteristics, and have been gradually applied in the field of grouting. Geopolymer is a new inorganic cementitious material formed by leaching the active components (Si, Al, and other elements) from industrial wastes such as fly ash, slag, and steel slag using chemical alkali activation technology (AAT) and further recombination. Using geopolymer as grouting material has two advantages :(1) geopolymer has a wide source of raw materials and low cost, which can effectively reduce the cost of grouting engineering; (2) Compared with cement materials, geopolymer materials have the advantages of low energy consumption, green environmental protection and other advantages, which can realize the effective recovery and reuse of industrial waste residue, reduce a large amount of CO2 emissions, and have far-reaching environmental and social benefits. Among them, temperature is an important factor affecting the properties of geopolymer grouting cementitious materials. In this paper, the effects of the selection of aluminosilicate raw materials, the fineness of raw materials, the ratio of liquid to solid, the type and modulus of alkali activator, and the temperature conditions on the properties of geopolymer grouting cementitious materials are comprehensively combed.