Abstract
In this study, the evaluation of the compressive strength and the strength distribution of concrete deteriorated is attempted by needle penetration test. A steel needle is penetrated on the side surface of core sample pulled out of concrete structure and the relationship between load acting to the needle and the amount of penetration is measured. As the expenmental result, the compressive strength and the strength distribution of concrete can be evaluated by the relationship between load and the amount of penetration. Further, the shape of needle suitable for this testing method and the automatization of the needle penetration testing device are investigated. Based on these experimental results, It is concluded that this testing method can be applied to evaluating the deterioration of concrete structures.
