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The variation law of C4AF and C3A corrosion products and the formation rate coefficient of CaCO3 of cement single ore were quantitatively analyzed by SEM, XRD and TG analysis and test methods. The experimental results showed that both C4AF and C3A produced a large number of flocculent phases after CO2 corrosion, but C3A produced more lumpy and flocculent phases after corrosion than C4AF corrosion. The relative crystallinity of C3AH6 decreases and the relative crystallinity of aragonite increases in the later stage of corrosion reaction, and the quantitative analysis results show that the content of CaCO3 in C4AF is higher than that of C3A, and the molar formation rate of CaCO3 in C4AF is 28.36 mol/d and that of C3A sample is only 4.23 mol/d after 1 day of corrosion reaction. With the extension of the corrosion reaction time to 28 days, the molar formation rate of corrosion products of C4AF and C3A continued to decrease, which was 1.83 mol/d and 1.48 mol/d, respectively. The coefficient of corrosion product formation α rate of C4AF was 32.62 after fitting, which was much higher than that of C3A single ore (2.74). The corrosion resistance of C3A ore in CCUS environment is stronger than that of C4AF, which not only provides theoretical guidance for the development of high performance cement materials resistant to CO2 corrosion, but also provides a basis for the application of cement in CCUS environment.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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