东南大学学报（自然科学版）2011，Vol.41Issue(4)：820-823,4.DOI:10.3969/j.issn.1001-0505.2011.04.031
二维散热条件对混凝土内部温度梯度及热传输的影响
Influence of two-dimensional cooling condition on inner temperature gradient and heat transferring in concrete
摘要
Abstract
In order to know the internal temperature distribution under two-dimensional heat radiating , the temperatures and their changes were measured from the peak hydration temperature within different positions in concrete specimen by embedding temperature sensors. Results show that under the condition of two-dimensional heat radiating, inner temperatures in concrete are affected by two directions. As coming close to the surface the temperature declines faster with time, which results in greater temperature differences between inside and outside. Consequently, greater temperature gradient and temperature stress are formed. In rapid cooling stage, I. E. From final set to 60 hours, the concrete cools down faster, which causes greater temperature stress. Under the condition of two-dimensional heat radiating, the interior heat transfer rate is bigger than that in near surface zone to transfer heat to the surface and the environment. In near surface zone at early stage, the temperature gradient could reach 80 ℃/m, while the internal temperature gradient is about 50 ℃/m. With the effects of surface heat dissipation, the temperate and temperate gradient at different locations of concrete under the same cooling conditions can be predicted. This can be used to find appropriate measures to prevent the occurrence of cracks in concrete.关键词
混凝土/温度梯度/温度应力/二维散热Key words
concrete/ temperature gradient/ temperature stress/ two-dimensional heat radiating分类
建筑与水利引用本文复制引用
刘玉峻,钱春香,庄园,高桂波..二维散热条件对混凝土内部温度梯度及热传输的影响[J].东南大学学报（自然科学版）,2011,41(4):820-823,4.基金项目
国家重点基础研究发展计划(973计划)资助项目(2009CB623203). （973计划）
