This study takes the construction of a variable cross-section continuous beam bridge pier as the background,and uses the nonlinear solver module of Midas FEA finite element software to analyze the factors affecting the temperature crack index during concrete pouring from three aspects:the pouring stage of concrete,the type of cement,and the pouring formwork material.The results indicate that using low heat cement for pouring can effectively delay the time at which temperature stress reaches its peak.After pouring,the temperature stress of the concrete is maintained at a relatively low level of about 0.2 MPa,with the minimum temperature crack index at 0.9212,which meets the requirements for limiting harmful cracks during the concrete pouring process.Therefore,during large volumes of concrete pouring,it is crucial to focus on the heat generation characteristics of cement.The use of low heat cement or appropriate cooling measures can effectively reduce the occurrence of temperature cracks,providing valuable guidance for the construction of large-volume concrete pouring.
mass concretehydration heattemperature fieldstress fieldtemperature crack index
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