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

A technology for waste concrete and regenerated sand, which is applied in the direction of grain processing, etc., can solve the problems such as the lack of relevant patent literature on the device and method of the regenerated sand system, the short service life of fine crushing and wear-resistant parts, and the low efficiency of the grinding system, so as to achieve a material balance. Easy to master, less equipment, strong source properties

Active Publication Date: 2018-09-07
GUANGZHOU UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

Examples

Experimental program
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Effect test

Embodiment

[0042] see figure 1 , a system device for preparing recycled sand from waste concrete. The waste concrete in the present invention refers to waste concrete materials produced by concrete production enterprises, concrete engineering quality inspection units, cement roads or concrete structure engineering construction sites. The system device includes a feed hopper 1, a belt feeder 2, a fine crusher 4, a belt output machine 5, and a screening machine 6; the output port of the feed hopper 1 is connected with the entrance of the belt feeder 2, and the belt feeder The outlet of the machine 2 is connected with the inlet of the fine crusher 4, the discharge port of the fine crusher 4 is connected with the inlet of the belt output machine 5, and the outlet of the belt output machine 5 is connected with the screening machine 6 The feeding port is connected, and the belt input machine 2, the fine crusher 4, the belt output machine 5 and the screening machine 6 are respectively electrica...

experiment example 1

[0059] The regenerated sand prepared by the system device for preparing regenerated sand from waste concrete can be used in concrete enterprises to comprehensively utilize waste concrete to produce regenerated concrete.

[0060] The reclaimed sand prepared by the invention is used to replace yellow sand to prepare C30 strength grade concrete. Take conventional C30 strength grade concrete as the control group 1.1m 3 The weights of the materials in the concrete of the control group are: 150-170Kg of cement, 85-100Kg of grade 95 mineral powder, 80-90Kg of grade II fly ash, 700-800Kg of natural yellow sand and the regenerated sand, and 1000-1200kg of natural gravel (The maximum particle size is 20mm, which contains 300kg of 5~10mm natural melon stone), water 155~165Kg, water reducing agent 6.00~7.50. The above-mentioned water reducer is a high-efficiency polycarboxylate water reducer, purchased from Guangzhou Luomei Building Materials Co., Ltd., and the brand is LM-S2. The 5~10m...

experiment example 2

[0065] The regenerated sand prepared by the system device for preparing regenerated sand from waste concrete can be used in dry-mixed mortar enterprises to comprehensively utilize waste concrete to produce regenerated masonry mortar.

[0066]The regenerated sand prepared by the present invention is used to replace yellow sand to prepare dry-mixed M10 masonry mortar. The conventional dry-mixed masonry mortar was used as the control group 1. The weight percentages of each dry material in the mortar of the control group are: 10-20% of cement, 3-7% of stone powder, 0.020-0.026% of thickener, 75-85% of recycled sand and natural yellow sand, and the weight of recycled sand accounts for and 15-35% of the total weight of natural yellow sand, and the water-material ratio is 14-16%. The above-mentioned thickener is hydroxypropyl methylcellulose ether, which is purchased from Shandong Yiteng New Material Co., Ltd., and the brand name is 60YT100000.

[0067] Taking the amount of thicken...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B02C13/00B02C13/28B02C23/16B02C23/00
CPCB02C13/00B02C13/28B02C23/00B02C23/16B02C2023/165B02C2201/06
Inventor 彭春元卢洪波余斌毛山红谢欢愉区淑燕房先宜陈跃勋唐宁
Owner GUANGZHOU UNIVERSITY
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