ASSESSMENT OF ULTRA-HIGH PERFORMANCE FIBRE REINFORCED CONCRETE- NORMAL STRENGTH CONCRETE OR HIGH STRENGTH CONCRETE COMPOSITE MEMBERS IN CHLORIDE ENVIRONMENT

摘要

The purpose of this study was to investigate the performance of composite members of ultra-high performance fibre-reinforced concrete (UHPFRC) and normal strength or high strength concrete (NSC/HSC) in chloride environments. Experimental studies were carried out on UHPFRC-NSC/HSC prisms in order to investigate the effect of dry and wet cycles on the flexural capacity of those composite members. Each prism specimen was designed with the UHPFRC layer in tension and the NSC/HSC layer in compression. Three fibre volume contents (1%, 1.5%, and 2%) were investigated. The test results revealed that the degradation in the flexural capacity of UHPFRC-NSC/HSC specimens after exposure to chloride ion solutions was between 4% and 17%. The results also revealed that the effect of using high strength concrete versus normal strength concrete in the composite prisms was negligible. In addition, the results revealed that the degradation in flexural capacity was reduced by an increase in the fibre volume content.