Print Email Facebook Twitter High speed photography technique for measuring impact strength of porous concrete Title High speed photography technique for measuring impact strength of porous concrete Author Agar Ozbek, A.S. Weerheijm, J. van Breugel, K. Publication year 2018 Abstract In this study, an impact strength measurement method based on high speed photography, that has been developed for testing porous concrete, was introduced. In the experiments, a drop weight impact test set-up instrumented with a high speed camera was used. The impact strength analyses were conducted using impedance mismatch method, where the wave reverberations were investigated in detail. The measurement configuration carries the advantage of being a fast, non-contact and accurate experimental method where only the known material properties and particle velocity data of the drop weight are required. The target cementitious material itself is not actually involved in the measurements or the subsequent analyses. The method also facilitates the observation of the crack patterns throughout the experiment. The measurement method was verified to be accurate and consistent by testing different types of porous concretes and by comparing the results with those from other dynamic monitoring techniques, such as laser Doppler velocimetry and direct stress gauge measurements. Subject Drop weightHigh speed photographyImpactImpedance mismatchPorous concreteConcretesDoppler effectDropsHigh speed camerasImpact strengthImpedance matching (electric)Velocity controlDrop weightDynamic monitoring techniquesHigh-speed photography techniqueImpactImpedance mismatchImpedance mismatch methodsLaser Doppler VelocimetryPorous concretesHigh speed photography To reference this document use: http://resolver.tudelft.nl/uuid:15550ba3-3d1f-4f02-8b8d-e4a93345be8d DOI https://doi.org/10.1016/j.conbuildmat.2018.08.031 TNO identifier 954958 Publisher Elsevier Ltd ISSN 0950-0618 Source Construction and Building Materials, 186 (186), 1092-1104 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.