Abstract
We investigated the relationship between the spalling behavior and internal vapor pressure of high strength concrete (HSC) with natural fiber when heated. The concrete specimens had a water-cement ratio of 0.30 (fc ≈ 70 MPa). The fibers used were natural jute fiber and PP fiber. The length of the jute and was 12 mm and its addition rates were 0.075% and 0.15% by volume, respectively. The HSC specimens were heated and their internal temperature and vapor pressure were then measured. Explosive spalling did not occur in the jute specimens.
