Iron ore waste rock self-compaction concrete

Abstract

The invention discloses an iron ore waste rock self-compaction concrete which is prepared by mixing and stirring iron ore waste rock, cement, sand, an admixture, water and an additive. The iron ore waste rock is continuous-graded macadam with the particle size of 5-20mm prepared by carrying out mechanical crushing and screening on ore-free wall rock and horse stone after iron ore exploitation. The additive is a compound additive compounded from a polycarboxylic acid high efficiency water reducing agent, an air entraining agent and a tackifier. The admixture is a compound material from any one or more of fly ash, granulated blast-furnace cinder powder, silica fume and rock powder. The sand is Region-II natural medium sand or mixed medium sand. By developing and utilizing the iron ore waste rock, the exploitation quantity and exploitation energy consumption of the natural iron ores are lowered, and the damage of the iron ore waste rock to the environment is reduced, so that the iron ore waste rock self-compaction concrete has obvious social benefits. Besides, the development and utilization of the iron ore waste rock can greatly lower the concrete production cost, thereby generating great economic benefits.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of iron ore waste rock resources, in particular to a self-compacting concrete prepared from iron ore waste rock as coarse aggregate. Background technique [0002] The domestic area is rich in mine resources. Mining mining provides a large amount of mineral energy for the economic construction of the same country. At the same time, the tailings and waste rocks left over from mining mining are also increasing year by year. These mine solid wastes mainly include iron ore waste rocks and limestone waste. five kinds of solid wastes, such as rock, iron tailings, coal gangue and gold tailings, these wastes not only occupy a large amount of land, pollute soil and water bodies, but also cause geological disasters, which are a huge hidden danger to the development of domestic cities. Mine debris flow The formation and occurrence are mainly caused by the unreasonable stacking of waste rocks and spoil...

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Problems solved by technology

[0004] In recent years, waste rock has been processed and utilized as a whole into various products, such as concrete coarse aggregate, railway ballast, cement raw material, cast stone production raw material, raw material for mineral wool production, smelting flux, underground deep mining mine goaf Filling materials and refractory clay in the area, recently the inventors used waste materials iron tailings and machine-made sand to form mixed sand to replace natural sand to prepare concrete, and iron tailing mud as raw material to prepare ceramsite lightweight concrete technology, but domestic There is no report on using iron ore waste rock as coarse aggregate to prepare self-compacting concrete

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