Accurate Control of Temperature Field of Mass Concrete Raft Foundation
The risk of potential thermal shrinkage cracking caused by the significant increase in temperature due to hydration heat during the pouring and curing process of the concrete raft on the saturated soil layer after deep excavation cannot be avoided.Emphasis was focused on the study of the variation of temperature field under the condition of significant fluctuation of soil moisture content caused by the nearby subway construction before the construction of a certain project.The simulation of temperature field control scheme was con-ducted,and the scheme was optimized on the premise of ensuring project safety.Through theoretical calculations and finite element simu-lation analysis,considering the uniqueness of the concrete pouring raft,a specific design of concrete hydration heat temperature control measures for the large-volume raft of this project was proposed,which can guarantee the strength of the raft and restrain the cracking of con-crete caused by excessive temperature difference inside and outside.The principles of heat conduction and the causes of concrete failure was analyzed,the temperature field of large-volume concrete raft foundation was simulated and analyzed using finite element method,and an ef-fective and precise cooling method was proposed for the hydration heat of pouring concrete raft on saturated soil after deep excavation,as well as cost control measures,to achieve effective cooling and energy saving and carbon reduction.The research results provide effective refer-ences for similar concrete raft projects in terms of temperature control technology to meet the carbon neutrality and carbon target policy.
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