OBSERVATIONS BASED ON LITERATURE SURVEY ON INFLUENCE OF AIR CONTENT ON COMPRESSIVE STRENGTH OF CONCRETE CONTAINING HIGH STRENGTH AREA

The influence of air content on compressive strength of concrete containing high strength area through literature survey. The findings are summarized as follows. Calculation method of strength reduction ratio varies depending on literatures, therefore the method must be clearly stated in the literature. The strength reduction ratio was 5 to 6% in normal strength area, but in high strength area it was 3 to 4％. Strength reduction ratio can be predicted by smaller of Talbot’s cement-space ratio method and Sakuramoto’s paste-air method. The strength reduction ratio was not change much from the age of 7 to 91 days.