Compressive Strength of Ultra-High Strength Fiber-Reinforced Cementitious Composites (UHSFRCC) containing Silica Fume

Author(s): Yu Zhang, Yunsheng Zhang
Paper category: Proceedings
Book title: 1st International Conference on UHPC Materials and Structures
Editor(s): Caijun Shi and Dehui Wang
ISBN: 978-2-35158-164-3
e-ISBN: 978-2-35158-165-O
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 261-271
Total Pages: 11
Language: English

Abstract: The use of silica fume (SF) and steel fibre can significantly enhance mechanical properties of ultra-high strength fibre reinforced cementitious composites (UHSFRCC) given SF’s physical and chemical effects, as well as steel fibres’ strain-rate effect. In this study, ten mixtures with cement-SF-steel fibres based on various curing were prepared. The relationships between the
binder composites and compressive strength were expressed in diagram. The pore structure and failure mode were comparably determined. The results indicated that the modification of UHSFRCC with elevating temperature curing caused significant improvement. The total porosity following the age and variation in temperature could be raised by 34.02%~43.93% and
38.91%~53.85% respectively as compared to the control. Moreover, the pore size of not more than 20 nm was also improved in course of age. However, the effect of hyperthermic water or a vapor curing on pore structure of the product with the high addition of SF reducing the compressive strength was not recommended. It was found that 1.5% steel fibre content is more
convenient to improve the compressive strength of UHSFRCC. It was observed that the increase in strength with addition of SF leads to an increase in brittleness, which was compensated by steel fibre.

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

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