Abstract
An economical and ecological (ECO) ultra-high performance fibre reinforced cementitious composite (UHPFRCC) with a high volume of mineral admixture as part of the binding materials and river sand as the aggregate was designed. The flowability and strength development of ECO-UHPFRCC with various dosages of nano-silica were studied. The effects of nano-silica on the morphology of hardened matrix microstructure and the hydrates characteristics were investigated by SEM, XRD, TG and nano-indentation. The results demonstrated that the mechanical properties of the ECO-UHPFRCC were significantly improved with the increased dosage of nano-silica; its compressive strength exceeded 200 MPa after 3 days of steam curing when mixed with 4% by weight of nano-silica. The static mechanical properties of ECO-UHPFRCC were enhanced as a result of the optimized micro-properties. The mechanism of the effects of nano-silica on the performance of ECO-UHPFRCC microstructure were investigated and discussed as well.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant Nos. 51438003 and 51378113) and partly supported by the National Basic Research Program of China (973 Program, Grant No. 2015CB655102) and a Plan of Six Peak Talents in Jiangsu Province (Grant No. JZ-004).
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Ma, R., Guo, L., Sun, W. et al. Strength-enhanced ecological ultra-high performance fibre-reinforced cementitious composites with nano-silica. Mater Struct 50, 166 (2017). https://doi.org/10.1617/s11527-017-1031-9
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DOI: https://doi.org/10.1617/s11527-017-1031-9