Journal
JOURNAL OF CLEANER PRODUCTION
Volume 231, Issue -, Pages 468-482Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2019.05.210
Keywords
Cement-soil mixture; Coal gangue; Mechanical properties; Elastic modulus; Durability; Microstructure
Categories
Funding
- National Natural Science Foundation of China [11790283]
- Chinese Railway Corporation [2017G005-B]
- Australian Research Council [DE150101751]
- ARC Industrial Transmission Research Hub Component Project [IH150100006]
- National Engineering Laboratory for High-speed Railway Construction, Central South University, China [HSR2017001]
- Wuhan Zhihe Geotechnical Engineering Co., Ltd.
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High-speed railways with high load capacity and long-term performance have been developed by the aid of high-performance construction materials for foundation treatments. The mechanical properties and durability of new cement-soil mixture reinforced by local sourced waste coal gangue aggregate were investigated in this study. Extensive experiments were carried out to analyse the effects of coal gangue on compressive strength, elastic modulus, stress-strain curve and anti-corrosion of cement-soil mixture. The results show that incorporation of coal gangue significantly improve the strength, stiffness and anti-corrosion ability of cement-soil mixture. Strength improvements up to 81.8% was achieved, but the ductile failure model shited to brittle failure with more than 42% coal gangue reinforcements. Except for the declining segment of the stress-strain curve, the ascending segment of the stress-strain curve can be fitted by the existing models. From the microstructural characterization, coal gangue can reduce acid solution permeation compared to the soil. For the cemented soil with coal gangue, the mass-loss rates only reach 4-7% after 140 days acid solution immersion. Therefore, this new clean production of high-performance cement-soil mixture through waste coal gangue reinforcement has great potential for railway foundation treatments. (C) 2019 Elsevier Ltd. All rights reserved.
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