A kind of flexible anti-cracking covering anti-seepage material with steel slag as main material and construction technology

A technology of anti-seepage material and construction technology, which is applied in the field of flexible anti-cracking covering anti-seepage material and construction technology with steel slag as the main material, which can solve the problems of deterioration of anti-seepage performance and easy cracking of the anti-seepage material of the covering layer, and achieve improvement Effects of compactness, drastic decrease in solution performance, and reduction in concentration of metal cations

Active Publication Date: 2022-08-02
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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  • A kind of flexible anti-cracking covering anti-seepage material with steel slag as main material and construction technology
  • A kind of flexible anti-cracking covering anti-seepage material with steel slag as main material and construction technology
  • A kind of 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 using the above-mentioned anti-seepage and anti-cracking material includes the following steps:

[0046] (1) The natural steel slag is washed with water and then air-dried, and then sieved according to the four particle size ranges of 0.5-1mm, 0.25-0.5mm, 0.1-0.25mm and 0.075-0.1mm, and the steel slag 1 is configured with reference to the preferred gradation: The mass between 0.5-1mm accounts for 40%, the mass between 0.25-0.5mm accounts for 30%, the particle size between 0.1-0.25mm accounts for 20%, and the particle size between 0.075-0.1mm 10%), and stir well. Then according to the demand, calculate and weigh the required total amount of steel slag (accounting for 94.7% of the total mass) according to the compaction degree of 85%.

[0047] (2) Calculate and weigh the required dry sodium calcium bentonite 2 total amount (accounting for 5% of the total mass) according to the degree of compaction of 85%, evenly add it to the stee...

Embodiment 2

[0055] The anti-seepage material of Example 2 is slightly different from Example 1, the difference is that according to the mass ratio of steel slag, sodium calcium bentonite and fiber, specifically steel slag 92.1%, sodium calcium bentonite 7.5%, 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 satisfies the "Technical Specification for Domestic Waste Landfill Treatment". (GB 50869-2013) requirements for the permeability coefficient of anti-seepage materials, and there are no obvious cracks after three dry-wetting cycles.

example 3

[0057] Example 3 The 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, 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 dry-wet cycle tests were carried out respectively. The penetration test results are shown in Example No. 3 in Table 1, and the permeability coefficient of the anti-seepage material is not greater than 10. -7 cm / s requirements, and no obvious cracks after drying and wetting cycles.

[0058] Table 1 Examples of anti-seepage and anti-cracking effects

[0059]

[0060]It can be seen from the above table that the permeability coefficients of the flexible anti-cracking and covering anti-seepage materials with steel slag as the main material obtained in Examples 1-3 all meet the requirements of th...

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Abstract

The invention discloses a flexible anti-cracking covering anti-seepage material with steel slag as the main material and a construction process. The material ratio is calculated by weight percentage, preferably graded coarse-grained steel slag accounts for 85-95%, sodium calcium bentonite accounts for 5-15%, and polypropylene fiber accounts for 0.1-1%; Mix and stir evenly, and then use the dry material compaction process for on-site construction to make a low-permeability cover layer flexible anti-seepage material. The invention can solve the problem that the anti-seepage material of the cover layer is easy to crack under the dry-wet cycle, which leads to the deterioration of the anti-seepage performance, and the steel slag is made into a flexible anti-seepage material of the cover layer through a new formula and construction technology, so as to realize the efficient resource utilization of the steel slag, Significantly reduces the cost of the covering layer, and can be used in industrial solid waste dumps and domestic waste landfills and other places.

Description

technical field [0001] The invention relates to an anti-cracking and anti-seepage material and a construction technique in the field of efficient resource utilization of steel slag, in particular to a flexible anti-cracking covering anti-seepage material and construction technique 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. Because the steel slag is strongly alkaline and contains free calcium oxide and magnesium oxide that are easy to absorb water and expand, the solidified body made of steel slag has problems such as cracking. Therefore, steel slag comprehensively The utilization rate is low, only about 30%, and about 70% of the steel slag is treated by in-situ accumulation. At present, the accumulated stock of steel slag in my country exceeds 2 billion tons, occupying a large amount of land resources. In order t...

Claims

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Application Information

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Patent Type & Authority Patents(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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