This research project was initiated to evaluate the performance of an ultrasonic testing device device in predicting compressive strengths from tests performed on samples of fresh concrete.
The initial phase of this study involved laboratory peroration of concrete cylinders water cement ratios. These were tested using ultrasonic equipment and the results were to be used in developing standard curves for predicting compressive strengths of fresh concrete. Had the laboratory results proved satisfactory, the next phase was to correlate the ultrasonic results taken in the field on actual construction sites with the compressive strengths of the roadway cylinders. Hopefully, as a result of the findings of this study an ultrasonic concrete testing program could be implemented, whereby concrete not conforming to specification requirements for compressive strength could be rejected prior to being placed in a structure.
Results of the laboratory phase of the project were not encouraging. Very little predictability of compressive strength on sad and gravel mixes was possible until several hours after addition of water to toe mixes. Experimentation with more homegeneous sand mixes yielded no better results. Further investigation with the present available equipment seems unwarranted.
New technological advances in nondestructive testing technology have created the opportunity to better utilize ultrasonic waves to aid in damage detec...
This report describes work to develop non-destructive testing methods for concrete pavements. Two methods, for pavement thickness and in-place strengt...
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