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Cement-stabilized red mud semi-rigid base and preparation method thereof

A semi-rigid base, cement-stabilized technology, applied in climate sustainability, sustainable waste treatment, solid waste management, etc., can solve problems such as low utilization rate, inability to carry out large-scale utilization, and inability to alleviate the heavy burden of red mud, etc. To achieve the effect of convenient material acquisition, large-scale utilization, environmental protection and alleviation of land occupation problems

Pending Publication Date: 2021-07-16
GUANGXI ROAD CONSTR ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the current utilization of red mud is only in the research stage, and most of it is used for mineral admixtures, mineral powders and cement mixtures, but its utilization rate is low and it cannot be used on a large scale. Compared with the huge discharge of red mud, The limited utilization rate still cannot alleviate the heavy burden brought by red mud to society and environment

Method used

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  • Cement-stabilized red mud semi-rigid base and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of cement-stabilized red mud semi-rigid base, specifically as follows:

[0024] First, the red mud is produced according to the following process. Specifically, the red mud is piled up; the red mud piled up is sequentially press-filtered and homogenized to obtain the required red mud.

[0025] The cement used is 42.5 ordinary Portland cement with a density of 2.95-3.15g / cm 3 , initial setting time 45min ~ 60min, 28d compressive strength ≥ 42.5MPa.

[0026] Then, according to the mass percentage ratio of cement:red mud is 5%:95%, cement and red mud are evenly mixed to obtain a cement-stabilized red mud semi-rigid base.

[0027] In order to verify the performance of the cement-stabilized red mud semi-rigid base prepared above, the maximum dry density and the optimum water content determined by the vibration test were added to it with a quality of 9.5% of the quality of the cement-stabilized red mud semi-rigid base. After mixing, the unconfined compr...

Embodiment 2

[0029] Press filter and homogenize the concentrated red mud in order to obtain the required red mud; the cement used is 42.5 ordinary Portland cement with a density of 2.95-3.15g / cm 3 , the initial setting time is 45min to 60min, and the 28d compressive strength is ≥42.5MPa; then, according to the mass percentage ratio of cement:red mud is 6%:94%, mix cement and red mud evenly to obtain cement-stabilized red mud Clay semi-rigid base.

[0030] The service performance of the cement-stabilized red mud semi-rigid base course of this example was measured by the same measuring method as in Example 1. The maximum dry density and optimum water content determined by the vibration test were added to the cement-stabilized red mud semi-rigid base with a mass of 10.3% of the tap water for mixing, and its 7d unconfined compressive strength was measured to be 1.91 MPa.

Embodiment 3

[0032] Press filter and homogenize the concentrated red mud in order to obtain the required red mud; the cement used is 42.5 ordinary Portland cement with a density of 2.95-3.15g / cm 3 , the initial setting time is 45min to 60min, and the 28d compressive strength is ≥42.5MPa; then, according to the mass percentage ratio of cement:red mud is 7%:93%, mix cement and red mud evenly to obtain cement-stabilized red mud Clay semi-rigid base.

[0033] The service performance of the cement-stabilized red mud semi-rigid base course of this example was measured by the same measuring method as in Example 1. Maximum dry density determined by vibration test (1.74g / cm 3 ) and the optimum water content (10.8%), adding tap water whose mass is 10.8% of the mass of the cement-stabilized red mud semi-rigid base course for mixing, and its unconfined compressive strength at 7d age was measured to be 2.35 MPa .

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Abstract

The invention belongs to the technical field of building materials, and particularly discloses a cement-stabilized red mud semi-rigid base. The cement-stabilized red mud semi-rigid base comprises the following components in percentage by mass: 90-95% of modified red mud and 5-10% of cement which are uniformly mixed. The invention also discloses a preparation method of the cement-stabilized red mud semi-rigid base mixture. The cement-stabilized red mud semi-rigid base prepared by the invention has the characteristics of convenience in material taking, energy conservation, environmental protection, simple process and easiness in preparation, and is a novel building material; and according to the material, a large amount of red mud can be utilized, the problems of environmental protection and land occupation caused by the red mud can be solved, increasing shortage of gravel resources is relieved, and the material has important economic significance and environmental protection significance. The unconfined compressive strength of the prepared cement-stabilized red mud semi-rigid base meets standard requirements, the manufacturing cost of the semi-rigid base can be greatly reduced, and production cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a cement-stabilized red mud semi-rigid base and a preparation method thereof. Background technique [0002] Red mud is a large amount of waste residue in the alumina production process. Generally, for every ton of alumina produced, 1.0 to 2.0 tons of red mud is incidentally produced. my country's red mud stockpile has exceeded 1.2 billion tons, and the comprehensive utilization rate of red mud is less than 4%. As a major province of my country's aluminum industry, Guangxi Province has a stockpile of more than 100 million tons of red mud, covering an area of ​​more than 10,000 mu, and a large amount of new red mud is discharged every year. A large amount of stockpiling of red mud not only occupies land, but also brings hidden dangers of environmental pollution, and many available components in red mud cannot be rationally utilized, resulting in secondary wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/04
CPCC04B28/04C04B18/0409C04B2201/50C04B2111/00017Y02W30/91
Inventor 张立明余述琼王长兵覃冠华蒋昌盛韦思李育林冯晓东范萌萌
Owner GUANGXI ROAD CONSTR ENG GRP CO LTD
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