The hardening process of cement based materials observed by calorimetry and ultrasonic tests

Author(s): Thorsten Leusmann, Hans-Werner Krauss, Harald Budelmann
Paper category: Proceedings
Book title: Proceedings of the 2nd International RILEM/COST Conference on Early Age Cracking and Serviceability in Cement-based Materials and Structures Volume 1
Editor(s): Stéphanie Staquet and Dimitrios Aggelis
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 85-90
Total Pages: 6
Language : English

Abstract: The extended round robin testing program (RRT+) within the COST Action TU 1404 “Towards the next generation of standards for service life of cement based materials” is a fundamental tool for a better understanding of the hardening behavior of cement-based materials (CBM) and the validation of advanced, non-standardized experimental techniques. At the iBMB tests at the ordinary concrete mixture (OC), the modified ordinary concrete mixture (MOC), the ordinary mortar (OM) and the modified cement paste mixture (MCP) were carried out [1].
The hydration heat release was measured by adiabatic and semi-adiabatic calorimetry. The adiabatic tests were carried out in an adiabatic concrete calorimeter which was developed at the iBMB. For semi-adiabatic calorimetry a simple setup without temperature control on the basis of the procedure described in EN 196-9 was used. The test setup can be used in any ambient conditions, for example on a construction site or in a concrete plant. Furthermore, the hardening process wa observed by measuring the change of ultrasonic pulse velocity as an indicator of the microstructure formation during hydration. The measuring system consists of ultrasonic transducers and silicon molds with vibration absorbers for the background noise reduction. This paper presents the test methods, results and explanatory approaches for the observed phenomena.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00

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