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Method used for preparing limestone powder from building waste concrete

A waste concrete and limestone powder technology is applied in the direction of solid waste management, sustainable waste treatment, climate sustainability, etc. It can solve the problems of occupying cultivated land, destroying vegetation, and deteriorating the ecological environment, so as to reduce resource consumption and environmental pollution. Realize the effect of resource reuse

Active Publication Date: 2019-01-11
沿河土家族自治县乡建商品混凝土有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As for the demand and waste of construction resources, my country is facing two problems: on the one hand, the comprehensive utilization rate of construction waste resources is only about 1 to 4%, and most construction wastes are landfilled and stockpiled, which not only pollutes the environment, but also On the other hand, with the mining of natural sand, vegetation is destroyed, which greatly deteriorates the ecological environment, making limestone mine resources more and more tense

Method used

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  • Method used for preparing limestone powder from building waste concrete
  • Method used for preparing limestone powder from building waste concrete
  • Method used for preparing limestone powder from building waste concrete

Examples

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Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 80kg of construction waste concrete containing 70-80% limestone sandstone aggregate, 10kg of limestone, 5kg of slag, and 5kg of silica fume, and mix them to make the materials physically blended and modified, and then crush them with a jaw crusher. Grinding with a type pulverizer until the residue on a 45 μm square hole sieve is 10%, that is, limestone powder.

Embodiment 2

[0027] Weigh 70kg of construction waste concrete, 20kg of limestone, 9kg of slag, and 1kg of silica fume containing 70-80% of limestone sandstone aggregate, mix them to make the materials physically blended and modified, and then crush them with an impact crusher. Grind with a type pulverizer until the residue on a 45 μm square hole sieve is 12%, to obtain limestone powder.

Embodiment 3

[0029] Weigh 75kg of construction waste concrete, 17kg of limestone, 5kg of slag and 3kg of silica fume containing 70-80% of limestone sandstone aggregate, and mix them to make the materials physically blended and modified, and then crush them with a vertical shaft crusher. Grind with a type pulverizer until the residue on a 45 μm square hole sieve is 8%, to obtain limestone powder.

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Abstract

The invention belongs to the technical field of waste concrete resource comprehensive utilization, and especially relates to a method used for preparing limestone powder from building waste concrete.According to the method, building waste concrete prepared from limestone sandstone aggregate is taken as a main raw material, appropriate amounts of limestone, mineral slag, silica fume, and the likeraw materials are adopted for co-grinding to prepare the limestone powder, and unhydrated cement particles in building waste concrete is subjected to further grinding so as to increase the strength ofconcrete after doping of the limestone powder, realize preparation of the limestone powder from the building waste concrete, reduce resource consumption and environment pollution, and realize resource cycling.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of waste concrete resources, in particular to a method for preparing limestone powder by using construction waste concrete. Background technique [0002] Limestone powder is a kind of admixture widely used in cement, mortar, concrete, etc. It is generally made by grinding limestone with high purity. At present, in the prior art, there are relatively many research technologies for limestone powder used in concrete admixtures, for example, a limestone powder preparation device for concrete and its preparation method with patent application number 201710696531.2, using limestone as raw material It is prepared to avoid contact between limestone powder and air, improve the performance of limestone powder, and avoid the defects of limestone powder distributing in the environment and polluting the environment; another example is the micro-expansion ultrafine composite modified limestone...

Claims

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Application Information

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IPC IPC(8): C04B18/16
CPCC04B40/0042C04B18/167C04B14/28C04B18/141C04B18/146Y02W30/91
Inventor 张加巨王勇王建义张荣芳王若逊王尧张雪敏
Owner 沿河土家族自治县乡建商品混凝土有限责任公司
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