Research on Early Age Hydration Performance of the Nano-silica Dioxide Modified Cement-based Material

Author(s): Xiuzhi Zhang, Xiaohan Du, Xiaoyan Zhao, Pengkun Hou and Xin Chen
Paper category: Proceedings
Book title: 3rd International RILEM Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): Changwen Miao, Wei Sun, Jiaping Liu, Huisu Chen, Guang Ye and Klaas van Breugel
Print-ISBN: 978-2-35158-188-9
e-ISBN: 978-2-35158-189-6
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 158-166
Total Pages : 9
Language : English

Abstract: The effect of inclusion of nano-silica (NS) to ordinary Portland cement (OPC) on the early age hydration characteristics and microstructure of hardened pastes was explored. The OPC–NS blends were prepared by the partial substitution of OPC by different content NS.
The fresh pastes were made using an initial water/solid (W/S) ratio of 0.5 and different hydrated time. At the end of each hydration time, the hardened blended cement pastes were tested for compressive strength, electrical resistivity, hydration heat, differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). The compressive strength results revealed that the nano-silica can improved the mechanical properties of the hardened past at early ages, especially with the paste containing 3 wt% NS. The results show that the nano silica can accelerate the early hydration of Portland cement, especially the promotion hydration process of C3S and C3A. At the same time, pozzolanic activity of the nano-silica of the early time reduce the content of calcium hydroxide, so that the early resistivity change is comprehensive effect of the hydration reaction with poaaolanic reaction.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00