"Recommendation for Practice of Mix design of Concrete" published by the Architectural Institute of Japan was revised in February 2015 after almost fifteen years. This revision was carried out to achieve consistency with the revision of JASS 5 2009. This recommendation also covers mix design methods that take into particular consideration performance specifications. This paper gives an overview of this latest revision of the "Recommendation for Practice of Mix design of Concrete".
Mechanical properties of 80 to 180MPa class high strength concrete at the age of 20 years were examined. Conclusions are as follows. (1)Long-term strength development ratio of high strength concrete is increased when water-binder ratio becomes low.(2) Drying shrinkage ratio of high strength concrete increases between the age of 10 years and the age of 20 years.(3) Core strength and rebound number of mock up column with high strength concrete are also increased by increase of the age.(4)Elastic modulus and poisson's ratio at the age of 20 years can be estimate by conventional estimate equation.(5) Carbonation has not occurred to surface of mock up column with high strength concrete at the age of 20 years.
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