Hydration kinetics, pore structure, 3D network calcium silicate hydrate, and mechanical behavior of graphene oxide reinforced cement composites

By Li Zhao, Xinli Guo, Yuanyuan Liu, Yu-hong Zhao, Zhongtao Chen, Yunsheng Zhang, Liping Guo, X. Shu, Jiaping Liu. Construction and Building Materials, 2018

137 citations recorded by the source corpus.

Abstract The effects of graphene oxide (GO) on the hydration kinetics, pore structure, mechanical properties, and the structure of calcium silicate hydrate (C-S-H) gels were systematically investigated by combinatorial techniques. GO can accelerate the cement hydration, refine the pore structure and increase the polymerization degree of C-S-H gels due to the nucleation effects of GO. The specific surface area of cement paste and the number of gel pores were reduced with the addition of GO. A 3D network structure of GO modified C-S-H gels was originally proposed based on the obtained results that GO could intercalate into the interlayer space of C-S-H gels through ionic bonding with Ca2+ and fill in the gel pores. A small fraction of GO (0.022 wt%) increased the 28 d compressive strength by 16.31%–25.60% at a various water to cement ratios, indicating that GO is a potential nano-reinforcing material for cement composites. The results would provide a well understanding of the reinforcing mechanisms of GO in cement composites and pave a pathway for the design of high-performance cement composites.

Subfields: Ceramics and Composites, Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/033fd6438290eb97e92cf34ebb1e3e9925ad4a0b