2023 Volume 61 Issue 12 Pages 1051-1058
A large scale casting experiment was conducted to investigate the applicability of mechanically compacted flowable concrete, an item that was newly added in the 2019 revision of JIS A 5308 “Ready-mixed concrete”, to port concrete structures, and to understand its effects on construction quality and productivity improvement at construction sites. Through a comparison based on visual inspection of the exterior and cut faces, as well as the results from ultrasonic wave propagation velocity measurements, it was confirmed that the quality of construction using mechanically compacted flowable concrete is at least on par with that of construction using ordinary concrete managed by slump. Regarding productivity improvement, it was confirmed that vibrator operation time and the travel distance of the vibrator operator were significantly reduced, and that the same or better construction quality can be ensured with a smaller labor load, suggesting the possibility of making a significant contribution to productivity improvement at construction sites.
