1. 1) S. Sumitro and T. Tsubaki: J. Materials, Conc. Struct., Pavements, JSCE, 40 (1998), 155-163.
2. 2) S. Igarashi and M. Kawamura: Doboku-Gakkai-Ronbunshu, 502 (1994), 83-92.
3. 3) M. Kiyota, H. Mihashi, T. Kanda and A. Kawamata: Cement Science and Concrete Technology, 56 (2002), 625-632.
4. 4) R. Cho, K. Kobayashi and T. Nishimura: Seisan-Kenkyu, 33 (1981), 22-25.