期刊
MATERIALS
卷 15, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/ma15020404
关键词
UHPC; casting; strength; fracture property
This study investigates the influence of different casting positions on the strength and fracture properties of ultra-high performance concrete, showing that mid-cast specimens have higher flexural strength and fracture properties compared to end-cast specimens. The flexural strength of specimens with hooked-end fibers is more likely to be affected by casting position. The residual load-to-peak load ratio is independent of casting position but affected by fiber type and fiber content.
The mechanical performance of ultra-high performance concrete (UHPC) is a function of fiber distribution and orientation, which are affected by the processing of the fresh material. In this study, the influences of two casting positions (mid-cast and end-cast) on strength and fracture properties of UHPCs with different fiber types and fiber contents were investigated. The results show that mid-cast specimens have higher flexural strength and fracture properties than end-cast specimens, while the compressive strength is almost unaffected by casting position. Compared to specimens with straight fibers, the flexural strength of specimens with hooked-end fibers is more likely to be affected by casting position. The residual load-to-peak load ratio is independent of casting position but affected by fiber type and fiber content.
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