Durability of ultra-high performance concrete under the coupling effect of sulfate solution freeze-thaw and dry-wet cycles

Author(s): An M.Z., Liang Z.L., Zhang G., Huang H.F., Ji W.Y.
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: 454-462
Total Pages: 09
Language: English

Abstract: The sulfate attack and physical damage of the reinforced concrete in the saline soil of our country are very serious. In this studyˈthe durability of fly ash replace micro silica fume ultra-high performance concrete (UHPC) in sulfate solution with freeze-thaw and dry -wet coupling cycles (coupling mechanism:8 times of freeze thaw cycles and 5 times of dry wet cycles)is investigatedˈand C50 high performance concrete(HPC50)is compared and analyzed. The study shows that fly ash replacement micro silicon fume percentage 0, 31.25, 43.75 and 56.25 of UHPC and HPC50 mass has the tendency of increasing first and then decreasing under the coupling effectˈthe relative dynamic elastic modulus of UHPC is on the increaseˈthe compressive strength variation has the tendency of increasing first and then decreasing and then increasing in three stages; The relative dynamic elastic modulus and compressive strength of HPC50 is decreasing along the increase of cycles. After the same numbers of cyclesˈthe relative dynamic elastic modulus and compressive strength of UHPC decreases with the increase of fly ash replacement percentage of micro silicon fume. UHPC has excellent durability under the coupling effect of sulfate solution freeze-thaw and dry-wet cycles, and is suitable for the design and protection of structure in sulfate environment.

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