期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 172, 期 -, 页码 626-634出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2018.03.164
关键词
Slag; Reactive MgO; Leaching test; Contaminated soil; Solidification/stabilization
资金
- Environmental Protection Scientific Research Project of Jiangsu Province [2016031]
- National Natural Science Foundation of China [41472258]
- Primary Research & Development Plan of Jiangsu Province [BE2017715]
- Colleges and Universities in Jiangsu Province Plans to Graduate Research and Innovation [KYLX16_0242]
- Scientific Research Foundation of Graduate School of Southeast University [YBJJ1735]
Ground granulated blast furnace slag (GGBS) is widely used to stabilize soils due to its environmental and economic merits. The strength and durability of reactive MgO activated GGBS (GGBS-MgO) stabilized lead (Pb)-contaminated soils have been explored by previous studies. However, the effects of simulated acid rain (SAR) on the leachability and micro-properties of GGBS-MgO stabilized Pb-contaminated soils are hardly investigated. This research studies the leachability and microstructural properties of GGBS-MgO stabilized Pb-contaminated kaolin clay exposed to SAR with initial pH values of 2.0, 4.0 and 7.0. A series of tests are performed including the semi-dynamic leaching tests using SAR as the extraction liquid, acid neutralization capacity (ANC), mercury intrusion porosimetry (MIP), and X-ray diffraction (XRD) tests. The results demonstrate that as the SAR pH decreases from 7.0 to 4.0, the Pb cumulative fraction leached (CFL) and observed diffusion coefficient (D-obs) increases significantly whereas the leachate pH decreases. Meanwhile, increasing the GGBS-MgO content from 12% to 18% results in the decrease of CFL and D-obs. Further decreasing the SAR pH to 2.0 results in the dissolution-controlled leaching mechanism regardless of the binder dosage. The differences in the leaching properties under different pH conditions are interpreted based on the cemented soil acid buffering capacity, hydration products and pore size distributions obtained from the ANC, MIP, and XRD tests, respectively. (C) 2018 Elsevier Ltd. All rights reserved.
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