A system device and method for preparing recycled sand from waste concrete

Abstract

The invention discloses a system device and method for preparing reclaimed sand from waste concrete. The system device comprises a feed hopper, a belt input machine, a smashing machine, a belt output machine and a screening machine in sequence so that the combined production of reclaimed sand, reclaimed broken stone, reclaimed melon seed stone and reclaimed fine powder can be achieved. The system device further comprises a dust remover with an induced draught fan and an air compressor, wherein the dust remover is used for collecting dust of the smashing machine and the screening machine to produce reclaimed fine powder. The waste concrete is strong in source property, special treatment is not needed, few refined devices exist, energy consumption is low, and the combined production of various reclaimed materials can be achieved. The strength of C30 concrete doped with reclaimed sand is higher than that of reference concrete, concrete with reclaimed sand having a high requirement for the slump constant is higher in adaptability, and the optimal replacement rate of reclaimed sand is 10-30%. The tensile strength of M10 masonry mortar doped with reclaimed sand is higher than that of reference concrete, the optimal replacement rate of reclaimed sand is 15-35%, and all performance of the prepared reclaimed dry-mix M10 masonry mortar can meet the requirement of national standard ready-mixed mortar GB / T25181-2010.

Description

technical field [0001] The invention belongs to the field of recycling of solid waste, and in particular relates to a system device and method for preparing recycled sand from waste concrete. Background technique [0002] Natural sand is a non-renewable resource in a short period of time. With the increasing development of infrastructure and the gradual implementation of environmental protection and sustainable development policies, natural sand resources are increasingly in short supply in many areas of my country, especially for concrete mixing. The price of sand is on the high side at the peak of sand use, and there is even no natural sand available. In addition to being widely found in construction waste, waste concrete also exists in concrete production enterprises, engineering quality inspection units, roads or construction sites. Concrete not only solves the pollution problem of waste concrete to the environment, but also saves natural sand and gravel resources. At th...

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Problems solved by technology

[0006] There has been no good solution to the problem of fine crushing of materials in China. Most of them still use PEX fine jaw crushers, and the crushed output particle size reaches 20-30mm. This is the main reason for the low efficiency and high energy consumption of the grinding system.

If the average particle size of the material is to be reduced, the life of the finely crushed and wear-resistant parts will be extremely short, and the benefit will deteriorate

[0007] At present, the production of domestic recycled coarse aggregate and its application in concrete are relatively mature, but there are no relevant patent documents for the system device and method dedicated to the preparation of recycled sand

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