Influence of steel fiber content on fresh and hardened properties of self-compacting concrete

摘要

This work aims to study the state of self-compacting concrete (SCC) and understand how its behavior is essential when adding mineral admixtures and hook-end steel fiber (HSF). The SCC is resistant to bleeding and segregation and can be casted without using compaction or vibration. The mineral admixture of fly ash (FA) is important for preventing segregation and bleeding and increasing workability. Furthermore, adding steel fibers to SCC improves the properties of hardened concrete, but it also decreases the workability properties of fresh concrete. This work investigates the properties of self-compacting fiber-reinforced concrete with 0%, 0.25%, 0.5%, 0.75%, and 1% concrete volume. Moreover, FA was used as an alternative material which replaced 30% of cement mass. The workability of fresh concrete was assessed using slump flow, slump flow T50, L-box, V-funnel, and funnel T5 tests. Moreover, bleeding and segregation tests were carried out on fresh concrete. The properties of hardened concrete were assessed through the average of three samples of compressive, indirect tensile and flexural strength tests. The results showed that FA improved the workability of SCC. On the other hand, utilizing 60 mm HSFs enhanced the properties of hardened concrete but reduced their workability.