Flexible anti-cracking covering anti-seepage material with steel slag as main material and construction technology

An anti-seepage material and construction technology technology, applied in the field of flexible anti-cracking covering anti-seepage material and construction technology with steel slag as the main material, can solve the problems of deterioration of anti-seepage performance, easy cracking of the covering layer anti-seepage material, etc. The effect of compaction, significant drop in performance, and improved durability

Active Publication Date: 2021-12-31
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In order to solve the problems existing in the background technology and to solve the problem that the anti-seepage material of the covering layer is easy to crack under the dry-wet cycle, which leads to the deterioration of the anti-seepage performance, the present invention provides a steel slag-based material suitable for solid waste storage yards. Flexible anti-cracking covering anti-seepage material and construction technology

Method used

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  • Flexible anti-cracking covering anti-seepage material with steel slag as main material and construction technology
  • Flexible anti-cracking covering anti-seepage material with steel slag as main material and construction technology
  • Flexible anti-cracking covering anti-seepage material with steel slag as main material and construction technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The preparation and construction process of using the above-mentioned anti-seepage and anti-cracking material includes the following steps:

[0046] (1) Wash the natural steel slag and air-dry it, then sieve it according to four particle size ranges of 0.5-1mm, 0.25-0.5mm, 0.1-0.25mm and 0.075-0.1mm, and configure the steel slag 1 according to the optimal grading: The quality of the particle size between 0.5-1mm accounts for 40%, the mass of 0.25-0.5mm accounts for 30%, the particle size of 0.1-0.25mm accounts for 20%, and the particle size of 0.075-0.1mm 10%), and stir well. Then according to the demand, calculate and weigh the total amount of steel slag required (94.7% of the total mass) according to the compaction degree of 85%.

[0047] (2) Calculate according to the degree of compaction of 85% and weigh the required dry sodium calcium-based bentonite 2 total amount (accounting for 5% of the total mass), evenly add it to the steel slag, and carry out a process of n...

Embodiment 2

[0055] The anti-seepage material of Example 2 is slightly different from that of Example 1. The difference is that according to the mass ratio of steel slag, sodium calcium-based bentonite and fiber, it is specifically 92.1% of steel slag, 7.5% of sodium calcium-based bentonite, polypropylene Fiber 0.4%. In order to verify its anti-seepage performance and anti-cracking performance, the flexible wall penetration test and three dry-wet cycle tests were carried out respectively. The penetration test results are shown in Example No. 2 in Table 1, which meets the "Technical Specifications for Domestic Waste Landfill Treatment" (GB 50869-2013) Requirements for the permeability coefficient of anti-seepage materials, and no obvious cracks after three dry-wet cycles.

example 3

[0057] Example 3 anti-seepage material is slightly different from Example 1. The difference is that according to the mass ratio of steel slag, sodium calcium bentonite and fiber, it is specifically steel slag 89.5%, sodium calcium bentonite 10%, polypropylene fiber 0.5%. In order to verify its anti-seepage performance and anti-cracking performance, the flexible wall penetration test and 5 times of dry-wet cycle tests were carried out respectively. The penetration test results are shown in Table 1, Example No. 3, and the permeability coefficient of the anti-seepage material is not greater than 10. -7 cm / s, and no obvious cracks after wet and dry cycles.

[0058] Table 1 embodiment anti-seepage and anti-cracking effect

[0059]

[0060]As can be seen from the above table, the permeability coefficient of the flexible anti-cracking covering anti-seepage material based on steel slag obtained in Examples 1-3 all meets the requirements of "Technical Specifications for Domestic Wa...

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Abstract

The invention discloses a flexible anti-cracking covering anti-seepage material with steel slag as a main material and a construction technology. The material proportion comprises the following components in percentage by weight: 85-95% of coarse particle steel slag, 5-15% of sodium calcium bentonite and 0.1-1% of polypropylene fiber, which are preferably graded. The preparation method comprises the following steps of: mixing and stirring the raw materials well according to the ratio in an air-drying state, and then carrying out site construction by using a dry material compaction process to obtain a low-permeability covering layer flexible impermeable material. The problem that the anti-seepage performance is degraded due to the fact that a covering layer anti-seepage material is prone to cracking under a dry-wet cycle can be solved. The covering layer flexible anti-seepage material is manufactured from steel slag through a new formula and a construction technology, efficient resource utilization of the steel slag is achieved, and the cost of a covering layer is remarkably reduced. The method can be applied to industrial solid waste storage yards, household garbage landfills and other places.

Description

technical field [0001] The invention relates to an anti-cracking and anti-seepage material and a construction process in the field of efficient resource utilization of steel slag, in particular to a flexible anti-cracking covering anti-seepage material and a construction process with steel slag as the main material. Background technique [0002] According to the data of the Ministry of Environmental Protection, the annual output of steel slag in my country is about 160 million tons. Since steel slag is strongly alkaline and contains free calcium oxide and magnesium oxide that are easy to absorb water and swell, it will cause problems such as cracking in the solidified body made of steel slag. Therefore, steel slag comprehensive The utilization rate is low, only about 30%, and about 70% of the steel slag is treated by in-situ accumulation. At present, the accumulative stockpile of steel slag in my country exceeds 2 billion tons, occupying a large amount of land resources. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/10C04B40/02C04B111/27C04B111/34
CPCC04B28/10C04B2111/27C04B2111/00293C04B2111/00767C04B2111/343C04B18/142C04B14/104C04B16/0633C04B40/0259
Inventor 詹良通丰田冯嵩倪佳琪
Owner ZHEJIANG UNIV
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