A kind of anti-seepage material and preparation method thereof

Abstract

The embodiment of the present invention discloses an anti-seepage material and a preparation method thereof. The chemical composition of the anti-seepage material includes in parts by weight: 40-65 parts of clay, 5-10 parts of granulated blast furnace slag powder, powder 5-10 parts of coal ash, 1-5 parts of magnesium oxide, 5-10 parts of sodium bentonite. The method comprises: mixing 5-10 parts of sodium-based bentonite with water to obtain hydrated sodium-based bentonite; mixing 40-65 parts of clay, 5-10 parts of granulated blast furnace slag powder, and 5 parts of fly ash ~ 10 parts and 1 ~ 5 parts of magnesium oxide are mixed to obtain a dry material; the sodium hydrate-based bentonite is mixed with the dry material to obtain a mixed material; the mixed material is mixed with water to obtain The anti-seepage material; the anti-seepage material has low permeability and high strength, and the permeability coefficient is 3.3×10 ‑9 cm / s~7.5×10 ‑9 cm / s, unconfined compressive strength 3156kPa~4302kPa.

Description

technical field [0001] The embodiments of the present invention relate to the field of underground engineering for municipal solid waste disposal and pollution prevention, and in particular to an anti-seepage material and a preparation method thereof. Background technique [0002] Municipal waste landfill is the most basic disposal method of municipal waste. Although incineration, composting or sorting and recycling can be used to dispose of urban waste, some of the residues that are difficult to handle still need to be finally landfilled. In order to protect underground water and soil resources from the potential pollution of landfills and other polluted sites, it is usually necessary to build vertical anti-pollution barriers around landfills and polluted sites. Vertical anti-seepage barrier technology can be divided into soil- Bentonite and cement-bentonite anti-seepage barriers, among which cement-bentonite anti-seepage barriers have poor low permeability, usually with a...

AI Technical Summary

Problems solved by technology

Although municipal waste can be disposed of by incineration, composting or sorting and recycling, some of the residues that are difficult to handle still need to be finally landfilled.

In order to protect underground water and soil resources from the potential pollution of landfills and other polluted sites, it is usually necessary to build vertical anti-pollution barriers around landfills and polluted sites. Vertical anti-seepage barrier technology can be divided into soil- Bentonite and cement-bentonite anti-seepage barriers, among which cement-bentonite anti-seepage barriers have poor low permeability, usually with a permeability coefficient of 10-6cm / s, and are susceptible to chemical corrosion, and the production of cement as a raw material consumes a lot of energy and air pollutants Large emissions, with the deterioration of the global environment, the cement industry has been increasingly unable to adapt to the requirements of the era of energy conservation and emission reduction

[0003] In existing projects, it is difficult to modify the cement-bentonite anti-seepage barrier to meet the low-permeability requirements of landfills and other polluted sites, and the high strength needs to be further improved

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