Investigation the engineering properties and environmental impact of electrolytic manganese residue-based grouting materials for karst application

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-11-30 DOI:10.1016/j.conbuildmat.2024.139344

Conggan Xu , Xuewen Lei , Lijun Han , Lei Lang , Zisong Chen , Saiou Fu , Qianshen Ding , Xuehao Liu , Ping Wang , Jiangshan Li

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引用次数: 0

Abstract

The leakage channels, like karst caves and pipelines, prevalent in karst landscape regions promote the migration of pollutants from the landfill containing electrolytic manganese residue (EMR) to the surrounding environment, which poses a significant threat to the adjacent environmental safety. Grouting technology is a crucial approach for sealing leakage channels in landfill sites, preventing pollution caused by stockpiled EMR. This work aims to develop an electrolytic manganese residue composite grouting material (ECG), composed of EMR, sulphoaluminate cement, coal fly ash, ground granulated blast furnace slag, and bentonite, that is suitable for sealing leakages and preventing pollution in landfill sites located in karst regions. The effects of the water-cement (w/c) ratio of 0.8–1.1 and the EMR dosage of 10 %-50 % on the flowability, setting time, strength, permeability and leachability of ECG were systematically investigated. The results indicated that the addition of EMR increased the setting time and enlarged the time interval between initial and final setting, exhibiting the better workability. The unconfined compressive strength of ECG could surpass 7.0 MPa in 28 days, and the hydraulic conductivity were lower than 1×10⁻⁷ cm/s, which favored the landfill leakage remediation and pollution control. The primary hydration products of ECG include ettringite (AFt), aluminum hydroxide (AH₃) gel, calcium silicate hydrate (C-S-H), and calcium alumino-silicate hydrate (C-A-S-H), contributing to the formation of network compact structure. Mn²⁺ present in EMR can be stabilized within ECG in the form of Jouravskite (Ca₃Mn(SO₄)(CO₃)OH₆·12 H₂O). The leaching concentration of toxic elements from ECG was lower than threshold values of Chinese standard GB 3838–2002. This innovative grouting material exhibits excellent workability and high performance, rendering it an optimal choice for leakage containment applications in karstic landfill environments.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.