Manufacturing Technology of Fc300 N/mm2 Ultra-High Strength and High Performance Concrete and Grout and Structural Characteristics as a Slender Column
By D. Honma, Y. Tanabe and M. Kojima
Concrete Journal, Vol.60, No.6, Jun. 2022
- Synopsis
- In 2017, the authors applied the concrete with a specified strength of Fc300N/mm2 to an actual structure as the first third-party certified project of such kind in Japan. This kind of concrete with ultra-high-strength and high-performance was achieved by developing several related manufacturing technologies. Two types of silica fume and a developed admixture containing shrinkage-reducing agents were used to achieve flowability and strength. Multiple fibers were added to ensure fire resistance, and the mixing time was increased. Moreover, a two-stage curing scheme with high curing temperatures was applied. As the joint grout was required to have the same strength level, the heating curing using heating wires was developed. As for the structural characteristic of slender columns fabricated with such concrete, the bond of the main reinforcements at the ends was removed to alleviate the damage caused by large deformation during an earthquake, which retained the column’s ability to carry axial forces.
- Keywords:
- Fc300N/mm2, Ultra-high strength concrete, Slender column
