Anti-cracking low-heat-transfer enhanced vertical blocking barrier material as well as preparation method and application thereof

Abstract

The invention discloses an anti-cracking low-heat-transfer enhanced vertical blocking barrier material as well as a preparation method and application thereof. The enhanced vertical barrier wall material is composed of in-situ soil, polymer modified bentonite and an additive. The polymer is selected from polyanionic cellulose or xanthan gum. The additive comprises the following main components: acementing material (granulated blast furnace slag and fly ash), an alkali activator (active magnesium oxide and cement) and a reinforcing agent (basalt fiber and biochar). Compared with a traditionalbarrier material, the enhanced vertical barrier wall material has the following characteristics that: the enhanced vertical barrier wall material has a stronger adsorption characteristic on heavy metal-organic matter combined pollution soluble substances; the adsorption capacity of the enhanced vertical barrier wall material is improved by 10-30%; the water-retaining property of the enhanced vertical barrier wall material is improved by 10-20%; the permeability coefficient of the enhanced vertical barrier wall material can still be kept smaller than 1*10 <-9> m / s under the action of a combinedpollution solution; the enhanced vertical barrier wall material has low heat transfer performance; and the enhanced vertical barrier wall material is suitable for being combined with other repair technologies.

Description

technical field [0001] The invention belongs to the field of barrier risk management and control of polluted sites, and in particular relates to an anti-cracking low heat transfer enhanced vertical barrier material and its preparation method and application. Background technique [0002] At present, my country is in the period of transformation of development model and adjustment of industrial layout. The original extensive economic development model urgently needs to be transformed into a development model that pursues efficiency. These factories often leave behind many contaminated sites. Due to the fact that enterprises do not pay attention to the means of sewage disposal under the extensive economic model, a large amount of pollutants are left on the original site of the factory. The pollutants in these sites often have the characteristics of various types, high concentrations of pollutants, and complex geological conditions of the site, threatening the surrounding soil. ...

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Problems solved by technology

[0004] Aiming at the problems that traditional vertical barrier materials have poor chemical compatibility in high-concentration pollutants, cannot meet the requirements of permeability coefficient, and are applicable to narrow engineering scenarios, the technical problem to be solved by the present invention is to provide a crack-resistant and low-heat-transfer Enhanced vertical barrier material and its preparation method and application. 1. The barrier material has good chemical compatibility, can resist the erosion of high-concentration heavy metal-organic pollution solution and keep its permeability coefficient always lower than 1×10 -9 m / s; 2. The adsorption performance of the barrier material to heavy metal-organic pollutants is greatly improved compared with the traditional barrier barrier, so that the barrier capacity of the barrier barrier to high-concentration composite pollutants is greatly improved; 3. The barrier material The water retention is 10%-30% stronger than that of traditional vertical barrier materials, and it has a certain low heat transfer performance. Compared with traditional barrier materials, the anti-cracking performance is significantly improved, and the applicable engineering scenarios are wider; 4. The vertical barrier barrier The raw materials are all green and environment-friendly materials, and the use of industrial by-products / waste can reduce the use of cement and other materials, thereby reducing energy consumption

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