- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | YUAN Yuan, ZHAO Renda, ZHAN Yulin, LI Fuhai, CHENG Zhengqing, LI Jian. Carbonation Resistance of Fly Ash-Slag Based Geopolymer Concrete[J]. Journal of Southwest Jiaotong University, 2021, 56(6): 1275-1282. doi: 10.3969/j.issn.0258-2724.20191151
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Two kinds of Class F fly ash-slag based geopolymer concrete, namely GPC-10 (10% slag content, 80 °C high-temperature curing) and GPC-50 (50% slag content, standard curing), are characterized by good mechanical properties. To understand better their carbonation resistance, rapid carbonation tests were carried out on the two kinds of geopolymer concrete in comparison with the ordinary Portland cement concrete (OPCC). The damage of concrete was evaluated in terms of compressive strength and splitting tensile strength. To analyze the damage cause, the composition and pore structure of the carbonized materials were investigated using X-ray energy spectroscopy (EDS) and mercury intrusion test (MIP), respectively. On this basis, carbonation models of the two kinds of concrete were established. The results show that compared with the OPCC, the geopolymer concrete has a weak carbonation resistance, especially for GPC-50, the type with high calcium content, in which the main product C—A—S—H was decomposed during carbonation, leading to an increase in porosity and thus accelerating the carbonation rate, and the carbonation depth has a linear relation with time. The 28 d carbonization depth of OPCC, GPC-10 and GPC-50 reached 2.0, 9.2 and 18.8 mm, respectively.
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