2017 Volume 71 Issue 1 Pages 494-500
In recent years, high-strength and high-durable concrete, such as Ultra High Strength Fiber Reinforced Concrete（UFC）, was developed and practiced. However UFC is hardly applied to reinforced concrete, because UFC is consisting of silica fume, reactive powder, portland cement and fine aggregate, so that the large autogenous shrinkage resulting from hydration of binder may cause cracking.
In this study, technique optimizing size distribution of particles of constituent materials, such as filler, cement, fine aggregate and coarse aggregate, was investigated for mix proportion to produce high-strength and high-durable concrete. The filler consisting of non-reactive powder was selected for decrease of autogenous shrinkage in comparison with UFC. Coarse aggregate was also mixed for decrease of matrix, because of RC application. Coefficient permeability to air is evaluated according to double chamber, i. e. Torrent, method.
The main conclusions are follows.
（1）The compressive strength of concrete determined by proposed mix designing method is 94.9N/mm2 and 111N/mm2 at the age of 7 days and 56 days respectively.
（2）The coefficient permeability to air of the concrete is smaller than the minimum scale of the equipment.
（3）This proposed concrete is durable and no-damaged against freezing-thawing even in artificial sea water according to the test results carried out until 600 freezing-thawing cycles.
