Measurement of Temperature from an Instrumented Concrete Overlay and Investigating the Effect of Temperature Gradient on its Responses

抄録

The present works reports an investigation on curling behavior of concrete overlay due to variation in temperature throughout the day. Temperature data was recorded continuously from a concrete overlay constructed in India and instrumented with a number of temperature sensors. The variation of temperature is found to be nonlinear throughout the day with positive gradient during 8AM to 7PM and negative gradient during 8PM to 7AM. The nonlinearity is more pronounced during day time than during the night time. A finite element model is developed for the analysis of the concrete overlay system due to the effect of temperature gradients as recorded from field. The results indicated that the slab bottom at the interior experiences maximum tensile curling stresses for a much longer period of time, whereas the top corner is experiencing tensile curling stress from 6PM to 8AM, indicating the possible duration of top-down cracking at corner.