Funct. Mater. 2022; 29 (1): 135-143.
Effects of graphene oxide on durability of ultra high performance concrete
1Zhejiang Industry Polytechnic College, 312000 Shaoxing, China
2Shaoxing University Yuanpei College, 312000 Shaoxing, China
3College of Civil Engineering, Changsha University of Science and Technology, 410076 Changsha, China
In this study, the effects of graphene oxide (GO) content on the mechanical property, durability, and drying shrinkage of Ultra-high performance concrete (UHPC) for Bridge were investigated, and corresponding microstructure evolution was also analyzed. The results showed that the flexural strength and compressive strength of UHPC with addition of GO were increased by 10.6 % ~ 25.7 % and 6.3 % ~ 15.8 % on day 28, respectively, and the optimum content of GO was 0.04 %. The chloride ion permeability and freeze-thaw resistance of UHPC increased with GO addition. The drying shrinkage of UHPC sample containing GO after 91 days increased by 1.4 % ~ 8.1 %. Microstructure analysis confirmed that the incorporation of GO into UHPC could improve its microstructure and pore distribution, in which the total porosity decreased by 16.6 % ~ 33.8 %, and the porosity (at the pore size of 0 ~ 20 nm) increased by 1.8 % ~ 8.6 %, respectively. This might be related to the nucleation effect of GO, the formation of dense gel structure between microcracks and GO, and the formation of hydrogen bonds between GO functional groups and C-S-H gels.
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