Concrete admixture and preparation method thereof

Abstract

The invention relates to a concrete admixture and a preparation method thereof. The admixture comprises the following components in part by weight: 3 to 6 parts of methacrylic acid, 12 to 25 parts of polyethylene glycol mono-ether acrylate monomer, 1 to 2 parts of allyl sodium sulfonate, 0.5 to 1 part of polyether acrylate monomer, 5 to 25 parts of ferrous sulfate, 4 to 20 parts of industrial salt, 1 to 5 parts of fly ash and 8 to 15 parts of calcium carbonate powder. The calcium carbonate comprises the following steps of: preparing materials, performing copolymerization reaction on the methacrylic acid, the polyethylene glycol mono-ether acrylate monomer, the allyl sodium sulfonate and the polyether acrylate monomer to obtain a copolymer, stirring and mixing the ferrous sulfate, the industrial salt, the fly ash and the calcium carbonate powder, and mixing the mixture and the copolymer to obtain the concrete admixture. Compared with the prior art, the invention has the advantages that: on the premise that the liquidity of the slurry is not changed, the filling water quantity is reduced by 15 to 25 percent, and the early strength of concrete is increased by 15 to 40 percent; and the preparation method is simple, short in production period, low in cost and suitable for large scale production.

Description

technical field [0001] The invention relates to a special concrete admixture preparation technology, in particular to a concrete admixture and a preparation method thereof. Background technique [0002] With the development of non-ferrous metal mineral resources, the filling method is an important mining technology. The raw materials of filling concrete used in traditional filling mining technology are mainly natural primary raw materials (such as cement, gravel, river sand and clean water). Since the sustainable development strategy was established in the 1990s, developed industrialized countries have successively regarded circular economy as an important way to achieve sustainable development. The waste generated by mine production itself, such as mining waste rock, mining wastewater, beneficiation tailings, and slag and fly ash produced by smelting and power generation, can be used as filling concrete materials for resource utilization, which can not only reduce producti...

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Problems solved by technology

[0003] However, due to the limitation of materials, the new concrete produced by using production waste often cannot meet the technical requirements of filling method mining production, so the research and development of new concrete and the addition of concrete modification have become an important bottleneck restricting the application of this technology

Because the existing admixtures are only for ordinary building concrete, the performance cannot meet the requirements of this kind of concrete for installation, or because the cost is too high, it is not suitable for large-scale use in mine production. This patent develops a special admixture for this demand. It is of great significance to improve the properties of waste rock concrete used for filling in mine production and to optimize the industrial production process.

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