Books » Author » H. Turner
By Singer, Z.; Illustrated by Turner, H.
Dive into the colourful waters of Rainbow Reef for more amazing adventures with Cammie - a true Seahorse Star!
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By Singer, Z.; Turner, H.
Cammie Sunbeam and her Pearlie friends are trying for their fourth pearl - and this time it's Sea Safety! Everyone has to learn about the dangers of the Deep, a strictly off-limits area of the ocean and home to reclusive sea dragons and deadly giant squids.
By Xu, Jiangong; Turner, H.
The acoustic emission (AE) technique has been found to be an informative nondestructive testing (NDT) method for evaluation of structures constructed with certain materials. While AE evaluation procedures and evaluation criteria have been proposed for nonprestressed concrete stru...ctures, standardized AE evaluation criteria for prestressed concrete beams are not available. The main objective of the study described in this dissertation was to develop and evaluate practical AE methods for integrity assessment of in-service prestressed concrete structures. The study encompassed a laboratory investigation of the AE response of prestressed concrete beams as well as a field investigation of the AE response of an in-service prestressed concrete bridge. The results of this study indicate that AE monitoring holds promise for nondestructive evaluation of prestressed concrete structures. For the laboratory study, AE was monitored while sixteen prestressed concrete T-beams---twelve beams constructed with self-consolidating concrete (SCC) and four beams constructed with conventionally consolidated concrete---were loaded in cycles of increasing intensity to failure. Several AE parameters, such as amplitude, duration, and signal strength, were investigated in relation to the structural integrity of the beams. Three previously proposed AE criteria for integrity evaluation of reinforced concrete members were evaluated with respect to the behavior of these prestressed concrete specimens. A new evaluation method based on the signal strength moment was proposed and proved effective for indicating the integrity of the prestressed concrete beams. The behavior and AE response of the SCC beams were compared with those of conventionally consolidated prestressed concrete beams. In addition, the effectiveness of the recently proposed ACI 437 Cyclic Load Test (CLT) NDT method for concrete structures was evaluated vis-a-vis the behavior of the laboratory specimens. Results indicated good agreemenRead more
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