engleski

Estimation of setting time in concrete through modelling of ultrasonic parameters

In a standardized procedure initial and final setting in mortar or concrete is determined from penetration resistance test. A wide variety of different test methods has been explored which are sensitive to the transformation of cement composites from a fluid to solid state. Different suggestions on how to determine initial and final setting from these measurements were given by their authors but up today there is no method which would be generally accepted and which would serve as a new standard for setting time measurement. In this paper a methodology of estimating setting time from ultrasonic measurements is given. Ultrasonic data for two concrete mixtures is modelled with exponential model using a curve fitting procedure. Model parameters representing time/age are compared with setting time determined by penetration resistance test.

setting, cement, ultrasonics

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