Abstract:
Setting and Hardening of Concret continuosly monitored by Elastic Waves

Authors H.W. REINHARDT C.U. GROSSE

Abstract

A short pulse either generated by an ultrasonic generator or by a steel ball impact travels through a fresh concrete specimen. Three features are measured: the propagation velocity of the compressional wave, the transmitted energy, and the frequency spectrum. All are sensitive to the age of concrete and to the composition of the mix. The varying parameters are water-cement ratio, dosage of retarder and super retarder, and type of cement. The setting and hardening of the concrete can be followed accurately. Keywords: Fresh concrete, setting, hardening, non-destructive testing, ultrasound, retarder, wave propagation.

Authors

Prof. Dr.-Ing. H.W. REINHARDT , born in 1939, studied Civil Engineering and made a thesis on photoelastic investigation of three-dimensional transient thermal stresses. Today he is Professor for Civil engineering materials at Stuttgart Univerity and Managing director of Otto-Graf-Institute (FMPA - Material Testing Research Institute) , Stuttgart, Germany.
email: reinhardt@po.uni-stuttgart.de 		Dipl.-Geophys. C.U. GROSSE born in 1961, studied Geophysics at the University of Karlsruhe. Today he procceed on his thesis (Deadline for July 1996) and is a research member at the Institute of Construction Materials, University of Stuttgart, Germany.
email: christian.grosse@po.uni-stuttgart.de
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