RESEARCH ON MECHANICAL PROPERTIES AND PORE STRUCTURE OF REACTIVE POWDER CONCRETE

Author(s): Jian Lin, Nannan Zhang, Qiyuan Zhang, Qionglin Fu and Junfeng Wang
Paper category: Proceedings
Book title: Proceedings of the 2nd International Conference on UHPC Materials and Structures (UHPC2018-China)
Editor(s): Caijun Shi and Baochun Chen
ISBN: 978-2-35158-219-0
e-ISBN: 978-2-35158-220-6
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 618-628
Total Pages: 11
Language : English

Abstract: In this work, the influence of water-binder ratio (W/B), sand-binder ratio (S/B), silica fume
(SF), ground granulated blast furnace slag (GGBFS) and curing temperature on the
mechanical properties of reactive powder concrete (RPC) is reported. The orthogonal test was
used to measure and analysis significant influencing factors. On this basis, the optimal W/B,
amount of SF, and steel fibers were determined by single factor experiment. Results indicated
that the optimal W/B and ratio of SF to cement were 0.18 and 0.35, respectively. Moreover,
RPC with 1.5 vol.% steel fibers had excellent fluidity and its compressive strength was up to
205.3 MPa after heat water-curing at 90°C , and 303.5 MPa after curing at high temperature of
250°C . Furthermore, the pore structure of RPC curing at different temperatures was studied
by using mercury intrusion porosimetry (MIP). MIP tests showed that the small pore under 10
nm in RPC without aggregates gradually increased while the most probable pore radius
decreased with increasing the curing temperature. These results could be used to explain the
compressive strength development of RPC curing under high temperature.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00