A method for preparing cement admixture by utilizing engineering spoil, cement admixture and cement composition

A cement admixture and cement composition technology, which is applied in the field of solid waste resource utilization, can solve the problems of unsatisfactory load-bearing member strength, complex sediment separation process, and insufficient utilization of engineering spoils, and achieve operability Strong sex and reproducibility, good economic and social effects, and the effect of realizing large-scale utilization

Active Publication Date: 2022-04-08
HARBIN INSTITUTE OF TECHNOLOGY SHENZHEN (INSTITUTE OF SCIENCE AND TECHNOLOGY INNOVATION HARBIN INSTITUTE OF TECHNOLOGY SHENZHEN)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But above-mentioned method lacks integrality to the utilization of project spoil, and the overall utilization rate of project spoil is not high enough, and sediment separation technological process is relatively complicated, loaded down with trivial details, and the cost of production line is higher, and the brick and brick prepared by utilizing the separated mud The overall strength of the blocks is low, and the 28-day compressive strength is only 10-15MPa, which cannot meet the strength requirements of load-bearing components, which limits the actual engineering application of load-bearing components

Method used

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  • A method for preparing cement admixture by utilizing engineering spoil, cement admixture and cement composition
  • A method for preparing cement admixture by utilizing engineering spoil, cement admixture and cement composition

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Grinding the granite residual soil (containing 50wt.% quartz and 30-35wt.% kaolin) and sieving through a 0.3mm sieve to obtain spoil powder with a particle size below 0.3mm;

[0037]The spoil powder is placed in a muffle furnace, heated from room temperature (25°C) to 650°C at a heating rate of 10°C / min for calcination, and kept at this temperature for 2 hours, and the muffle furnace is closed after the heat preservation is completed. After the temperature in the muffle furnace cavity is naturally cooled to room temperature (25° C.), the cement admixture is obtained.

Embodiment 2

[0039] Grinding the granite residual soil (containing 50wt.% quartz and 30-35wt.% kaolin) and sieving through a 0.3mm sieve to obtain spoil powder with a particle size below 0.3mm;

[0040] The spoil powder is placed in a muffle furnace, heated from room temperature (25°C) to 700°C at a heating rate of 10°C / min for calcination, and kept at this temperature for 2 hours, and the muffle furnace is closed after the heat preservation is completed. After the temperature in the muffle furnace cavity is naturally cooled to room temperature (25° C.), the cement admixture is obtained.

Embodiment 3

[0042] Grinding the granite residual soil (containing 50wt.% quartz and 30-35wt.% kaolin) and sieving through a 0.3mm sieve to obtain spoil powder with a particle size below 0.3mm;

[0043] Put the spoil powder in a muffle furnace, heat it from room temperature (25° C.) to 650° C. at a heating rate of 10° C. / min for calcination, and keep it at this temperature for 3 hours. After the heat preservation is completed, close the muffle furnace. After the temperature in the muffle furnace cavity is naturally cooled to room temperature (25° C.), the cement admixture is obtained.

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Abstract

The invention belongs to the technical field of resource utilization of solid waste, and in particular relates to a method for preparing cement admixture by using engineering waste soil, a cement admixture and a cement composition. The method for preparing cement admixture from engineering spoil provided by the present invention comprises the following steps: crushing engineering spoil to obtain spoil powder; calcining the spoil powder to obtain cement admixture; The spoil includes kaolin, and the content of the kaolin is above 30wt.%. The calcining temperature is 650-700°C. The method for treating engineering spoils in the invention is simple and easy to operate, and the prepared cement admixture can meet the strength requirement of concrete for cementitious materials, and can realize large-scale utilization.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of solid waste, and in particular relates to a method for preparing cement admixture by using engineering waste soil, a cement admixture and a cement composition. Background technique [0002] According to the "Report on the Development of China's Construction Waste Recycling Industry (2014)", the amount of construction waste in my country has grown at an average rate of 10% per year. In recent years, China's annual discharge of construction waste is about 1.55 billion tons ~2.4 billion tons, accounting for about 40% of urban waste, and most of the remaining sludge is engineering spoil. Therefore, resource utilization of engineering spoils has important economic and social benefits. [0003] In the prior art, when using engineering spoils for development and utilization, the sediment separation treatment technology is mainly used. The separated sand and gravel can be directly sold as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/04C04B28/04C04B18/16
CPCC04B28/04C04B20/04C04B18/16C04B2201/50C04B2111/00017Y02W30/91
Inventor 邹笃建刘铁军周傲章文杰魏慧男
Owner HARBIN INSTITUTE OF TECHNOLOGY SHENZHEN (INSTITUTE OF SCIENCE AND TECHNOLOGY INNOVATION HARBIN INSTITUTE OF TECHNOLOGY SHENZHEN)
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