Fly-ash-base filling material

Abstract

The invention relates to a building material applied to construction industry, particularly a fly-ash-base filling material, belonging to an inorganic Portland cement material. The fly-ash-base filling material is prepared from the following components in parts by weight: 30-40 parts of desulfurized gypsum, 40-50 parts of fly ash, 5-10 parts of ordinary Portland cement, 1 part of curing agent, 0.5 part of expanding agent and 0.5 part of setting accelerator. The curing agent is lime, the setting accelerator is sodium sulfate or potassium sulfate, and the expanding agent is common air entraining agent. The fly-ash-base filling material has the advantages of reasonable design, absolute flame retardancy, high safety and lower cost.

Description

technical field [0001] The invention relates to building materials used in the construction industry, underground cavities and underground goafs, specifically belongs to inorganic Portland cement materials, in particular to a fly ash-based filling material. Background technique [0002] CN1057825 discloses a kind of high-water solidified supporting material for mining, and its characteristics are: 1, add a small amount of citric acid and mix water by the special cement with high Al2O3 content to be mixed with first material slurry and add anhydrite, unslaked lime, bentonite and calcium carbonate A small amount of sodium carbonate is mixed with water to prepare two kinds of slurry into B slurry; 2. Before the two kinds of slurry are mixed, they can be placed alone for 12 to 48 hours without solidification. After the two are mixed, they can be solidified in 15 to 30 minutes. After solidification The strength can reach above 1 MPa in 6 hours, the strength can reach 2-4 MPa in 2...

AI Technical Summary

Problems solved by technology

However, it needs to use specially fired high-strength aluminate cement clinker, which restricts its application. Using low-strength aluminate cement clinker, although the early strength is also high, the later strength cannot reach 4.5 MPa

[0006] The raw materials used in the existing high-water filling material products are clinker for the production of sulphoaluminate cement above 62.5MPa or specially fired aluminate cement clinker to prepare component A, high-strength grade sulphoaluminum above 62.5MPa Salt cement clinker and specially fired aluminate clinker have high raw material quality and calcination requirements. Only a few domestic manufacturers can produce it. Not only the price is high, but most of the products are mainly sold abroad, which seriously restricts the high Popularization and Application of Water Filling Materials in China

In addition, the existing high-water filling materials will lose weight after losing water, and there will be a lot of efflorescence on the surface, which will affect the appearance and may cause environmental pollution