| Summary: | 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.
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