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| Compressive strength, pore structure and material composition of IWSF-FA mold-bag concrete |
| XU Deru1, ZOU Chunxia1*, DING Hongjing2, SUN Haoran1, ZHAO Quan3, WU Jun3 |
| 1. College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China; 2. College of Science, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China;3. Urad Irrigation District Management Bureau, Hetao Irrigation District, Bayannaoer, Inner Mongolia 014400, China |
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Abstract In order to enhance the coagulation performance of the mold-bag concrete lining and reduce the cement consumption, the industrial waste silicafume(IWSF)and fly ash(FA)from Inner Mongolia Hetao Irrigation is used to replace part of the cement on the mold-bag concrete lining appropriately. The compressive strength, pore structure and internal material composition of concrete lining are studied by the experiment such as the compressive strength test, ultraviolet test, nuclear magnetic resonance(NMR)and thermogravimetric test, so as to know how the characteristics are affected by IWSF and FA replaced part of cement. Firstly, the compressive strength of the mold-bag lining can increase by double-mixing of IWSF and FA suitably, such as FA15S4. Secondly, the composition of the hydration products C-S-H and CH in the double-mixing group is the better than that in other groups on its ultraviolet absorption spectrum. Thirdly, the NMR T2 spectrum distribution of the IWSF-FA concrete exhibits a three-peak structure, whose left peak signal amplitude is the highest, and IWSF-FA is be-neficial to improving the internal pore structure of concrete. Fourthly, the IWSF-FA concrete has good thermal properties. Furthermore, a prediction model of the early compressive strength of the mold-bag concrete based on the BP neural network theory was established,and the maximum relative error between the prediction result and the test value is 2.7%. This research will provide reference for the application of IWSF-FA concrete in hydraulic lining engineering.
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Received: 06 November 2020
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