【摘 要】
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Nanotechnology is being used in UHPC for achieving more dense structural packing and better physical and mechanical properties.In this paper, nano-silica pa
【机 构】
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State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of
【出 处】
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The 10th International Symposium on High Performance Concret
论文部分内容阅读
Nanotechnology is being used in UHPC for achieving more dense structural packing and better physical and mechanical properties.In this paper, nano-silica particles (O-lwt %) by cement were incorporated in cement pastes and mortars with water-binder ratio of 0.2, and their effect on fresh properties was addressed.The fresh properties of mixtures were investigated by spread, rheology and cohesiveness.In addition, effect of nano-silica on cement hydration was also investigated.The results show that significant increase of yield stress, viscosity and cohesiveness is observed with nano-silica above 0.005 wt% by cement,but nano-silica with content below 0.005% presents an improvement of workability especially with content of 0.002%.Moreover, the addition of nano-silica in cement pastes obviously accelerates the early cement hydration rote, but does not increase the cumulative heat evolution.
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