期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 186, 期 -, 页码 1177-1187出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2018.08.050
关键词
Alkali-activated cement; Acid attack; Pore structure; Slag; Fly ash
资金
- Jiangsu Higher Education Institutions for Priority Academic Program Development (PAPD)
- National Natural Science Foundation of China [51702278]
- Collaborative Innovation Center for Ecological Building Materials of Jiangsu Province [CP201506]
- Australian Research Council [DE170101070, DP160104149]
- Australian Research Council [DE170101070] Funding Source: Australian Research Council
In the present work alkali-activated fly ash/slag cements (AACs) are synthesized and exposed to sulphuric acid (pH = 1.0) to investigate their anti-corrosion properties. The mineralogical compositions, pore structure and microstructure of different layers of the corroded samples are examined, along with the compressive strength change. The results show that with fly ash/slag ratio varying from 100/0 to 0/100, the compressive strengths of all of the samples decrease during acid attack: the most anti-corrosion mixture is found in the pure fly ash binder, which retains 83.5% strength after 28 days of exposure. Gypsum is only observed in the surface layer (0-5 mm) of samples. In terms of pore structure, the acid attack results in higher porosities in the corroded layers than their corresponding uncorroded layers. The samples with slag addition show a notably pore structure change. The sulphuric acid attack on the AACs binders has certainly led to the increase of porosity, regardless of the compact level of AACs (slag addition leads to compacter microstructure). The Al/Si atomic ratios in the corroded layer decrease after acid attack, and the reduction ratios become smaller as slag content increases, suggesting a dense matrix is advantage to impede the loss of aluminum from gel structures. (C) 2018 Elsevier Ltd. All rights reserved.
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