Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10225319 | Construction and Building Materials | 2018 | 14 Pages |
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 (0.022â¯wt%) increased the 28â¯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.
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Authors
Li Zhao, Xinli Guo, Yuanyuan Liu, Yuhong Zhao, Zhongtao Chen, Yunsheng Zhang, Liping Guo, Xin Shu, Jiaping Liu,