Abstract
Concrete setting behaviour and strength development strongly influence the scheduling of construction operations such as surfacing, trowelling, jointing, saw-cutting and formwork removal. The aim of this study was to investigate technologies available to monitor the changing properties of a fresh mixture, particularly for use with self-consolidating concrete (SCC). In order to evaluate test methods to monitor the setting and stiffening behaviour of conventional concrete and SCC, mixtures were made with different aggregate types and sizes and different cementitious materials. A number of techniques were used to monitor setting time, stiffening and formwork pressure of SCC mixtures. These included longitudinal (P-wave) ultrasonic wave propagation, penetrometer-based setting time, semi-adiabatic calorimetry and formwork pressure. Tests were conducted on a large matrix of SCC mixes designed for bridge construction applications. The results revealed that the P-wave test and calorimetric measurements can be used to monitor the stiffening and setting of SCC mixtures.
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