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A kind of recycled cement prepared from waste concrete and its preparation method and application

A technology of waste concrete and recycled cement, which is applied in the direction of cement production, etc., can solve the problems of high cost, time-consuming and laborious, and the destruction of ecological vegetation that is difficult to restore, and achieve the effect of low cost and high utilization rate

Active Publication Date: 2022-04-12
ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And it takes about 1 ton of limestone to produce 1 ton of cement, and the mining of limestone and clay minerals often brings irreparable damage to ecological vegetation.
[0005] The existing method of preparing recycled cement includes a variety of raw materials, mainly through manual attempts to determine the optimal solution, which is not only time-consuming and labor-intensive, but also high cost

Method used

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  • A kind of recycled cement prepared from waste concrete and its preparation method and application
  • A kind of recycled cement prepared from waste concrete and its preparation method and application
  • A kind of recycled cement prepared from waste concrete and its preparation method and application

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specific Embodiment

[0061] In step (1), n ​​is 5, and the 5 raw materials include waste concrete, bluestone, diatomite, fine iron powder and alumina powder.

[0062] Waste concrete raw materials are taken from the demolition site of a steel-concrete structure building in Zhengzhou. The waste concrete block has a diameter > 100mm because it is not finely broken. It must be crushed, screened and classified. Among them, the recycled aggregate with a particle size of 9.5-4.9mm is less than 4.9mm The recycled concrete machine-made sand is used as the raw material of recycled cement, and its chemical composition is shown in Table 1.

[0063] Table 1 Conventional seven-item analysis table of chemical elements in waste concrete

[0064]

[0065] The calcareous raw material required for the preparation of recycled cement comes from the bluestone surrounding rock of a bauxite mine in Yanshi, Luoyang. Its chemical composition is shown in Table 2.

[0066] Table 2 Analysis results of chemical elements o...

Embodiment 16

[0098] An application of recycled cement prepared by using waste concrete in all-solid waste permeable concrete. The specific preparation method and raw material ratio are the same as the patent-CN201911102064. It is necessary to replace the ordinary silicon 525 cement with the cost-patented recycled cement.

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Abstract

The present invention proposes a recycled cement prepared by using waste concrete and its preparation method and application. The recycled cement is prepared from the following raw materials in mass fraction: waste concrete 63.2-73.9%, bluestone 22.4-32.0%, diatomite 1.4-3.3% , refined iron powder 1.2‑2.8% and alumina powder 0.2‑2.1%. The method of the present invention can quickly and effectively determine the optimal ratio of various raw materials of recycled cement, and the cost is low, without the need for laborious and time-consuming multiple attempts, the recycled cement has a high utilization rate of waste concrete, and its performance meets the requirements of national standards. in permeable concrete.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of construction waste, in particular to recycled cement prepared from waste concrete and its preparation method and application. Background technique [0002] Entering the 21st century, China's construction industry has also entered a stage of rapid development. The continuous increase in population base and the continuous acceleration of urban renewal have led to the acceleration of the metabolism of my country's construction industry, and a huge amount of construction waste is produced every year. The large increase in construction waste has caused a large number of sluggish accumulations around the city to occupy precious land resources, and at the same time bring greater pollution and damage to the surrounding soil and atmosphere, which has become a major drawback that hinders urban development. [0003] Construction waste refers to the general designation of muck, waste conc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/24C04B7/36C04B7/42
CPCC04B7/246C04B7/36C04B7/424C04B7/427C04B7/422Y02P40/10
Inventor 赵毅刘玉林谭琦程新涛
Owner ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD