Water glass is used as a binder for inorganic materials. Also known as pyrophorine. Such alkali metal silicates are produced by the melting reaction of quartz sand with sodium, or potassium, or lithium carbonate (or sulfate). Its general chemical formula is R2O•nSiO2•mH2O, R2O refers to alkali metal oxides, such as Na2O, K2O, Li2O; n refers to the number of moles of SiO2; m is the number of moles of H2O it contains. These alkali metal silicates dissolve in water and hydrolyze to form sol. The sol has good cementation property. Therefore, it is widely used as an inorganic material binder in the industry, widely used as a bond in the refractory industry, and is used as a cement concrete accelerator in construction, and is also widely used in papermaking and textile industries. Development direction and prospect of sodium silicate chemical grouting materials:
① Chemical grouting materials are mainly used in underground engineering, and the underground environment is complex and changeable, which requires the development of different kinds of water glass slurry materials with good comprehensive performance according to different underground environments.
One of the important meanings of the study of new sodium silicate slurry is that the main agent of sodium silicate slurry will not cause environmental problems in addition to causing alkaline pollution, so when selecting additives, it is necessary to consider whether it is toxic, toxic before the use of the slurry, or toxic during use, or toxic after the completion of the project. Looking for non-toxic sodium silicate additives is the development trend of new sodium silicate slurry materials.
③ Water glass pulp material as a chemical grouting material has a long history of use, but its solidification principle so far, there is still no consistent statement, to develop a new water glass pulp material, it is necessary to carry out in-depth research on water glass gel mechanism.
(4) The polymerization and curing process of sodium silicate slurry is a very complex process, and only by first understanding the principle of cement consolidation can we provide a basis for studying the gelation time of sodium silicate slurry.
Compared with other chemical grouting materials, the biggest advantage of sodium silicate slurry is low cost, and the disadvantage is that its consolidation strength is not as good as some chemical slurry, so the strength of sodium silicate slurry to explore the potential, is also a future direction of efforts.
The application of sodium silicate slurry is currently mostly limited to temporary or semi-permanent projects, because the research in durability needs to be in-depth.
The development process of water glass modifiers, from a single modifier to a composite modifier development, the experiment proved that the use of composite modifiers than a single modifier often has more excellent performance.
Post time: Mar-20-2024