A Study on Evaluation of High-Performance Concrete Strength Using the P-Wave Speed

• Main Authors: Changfan, Hung, 張范宏
• Other Authors: Yiching Lin
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/34043785182161283492

碩士 === 國立中興大學 === 土木工程學系 === 84 === The objective of this thesis was to investigate the relationship between compressive strength and P-wave velocity of high-performance concrete (HPC) and to evaluate the feasibility of using P-wave velocity as a measure of HPC compressive strength. Past researches have shown that owing to the fact that the compressive strength of normal strength concrete (NSC) is controlled by the strength of mortar but P-wave velocity is influenced significantly by the quality and amount of coarse aggregate, various NSC mixtures produce a poor strength-velocity relationship. Unlike NSC, HPC behaves more like an ideal composite material because the strength of mortar can be as high as aggregate and the stress can be shared by the aggregate and mortar. It is believed that the strength-velocity relationship for HPC can be much better than that for NSC. In order to establish the strength-velocity relationship for HPC, the studies measured the P-wave velocity of HPC cylinders with various water/cementitious material ratio (w/(c+p)), aggregate content and curing temperatures by impact-echo method and ultrasonic method first, then compared with their compressive strengths obtained by uniaxial compression test. The results of these studies show that the variation in the strength-velocity relationship for HPC is much smaller then that for NSC, therefore, the use of the P-wave velocity for on-site evaluation of high-performance concrete strength is promising.