Self-compacting concrete prepared from iron ore tailings, and preparation method thereof

Abstract

The present invention discloses a self-compacting concrete prepared from iron ore tailings, and a preparation method thereof. The self-compacting concrete is prepared through adding 38.00-46.00% of a coarse aggregate, 23.00-37.00% of a fine aggregate, cement, 15-24% of a cementing material and 0.30-0.48% of an additive to water. The coarse aggregate is prepared through mixing crushed stones with particle sizes of 5-20 mm. The fine aggregate is the mixed sands prepared from iron ore tailings and machine-made sands or natural sands, wherein the mixed sands meet the technical requirements of thesands in the region II, preferably that a mass ratio of the iron ore tailings to the machine-made sands or the natural sands is 3:7-7:3. The cementing material is a mixture, wherein the mixture comprises cement, fly ash and ground slag powder. A mass ratio of the water to the cementing material is 0.30-0.50. The additive is a mixture, wherein the mixture comprises a water reducing agent and a tackifier, the water reducing agent is a polycarboxylic superplasticizer, the tackifier comprises a cellulose polymer or an amide polymer. With the present invention, the damage to the ecology environment due to the natural sand mining is reduced; the damage to the environment due to the iron ore tailings is reduced; the waste can be utilized; a purpose of reutilization of the resource is achieved; with adopting the iron ore tailings, the concrete cost can be substantially reduced, and significant social benefits and economic benefits are provided.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a self-compacting concrete prepared by using industrial solid waste iron ore tailings, fly ash and the like as raw materials. Background technique [0002] Mineral resources are important natural resources for the survival of human society. The development and utilization of mineral resources has provided a huge impetus for social progress, and at the same time, a large number of waste rocks and tailings and other mineral wastes have been discarded; the continuous growth of mineral wastes has brought The pressure of environmental pollution in the future has become a thorny problem affecting my country's construction of a circular economy society and the realization of the strategic goal of sustainable development, which urgently needs to be studied and resolved. [0003] my country is a big mining country, but the grade of most mine resources is low, and a large amoun...

AI Technical Summary

Problems solved by technology

Some structures have dense steel bars and narrow sections; some concrete to be poured is located under the existing structure, and it is difficult to effectively pour it by traditional methods. These structural concretes are often not easy to be completely compacted and form defects. Application of self-compacting concrete can be a good solution this question

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