Based on the engineering background of bored piles in permafrost regions of Qinghai-Tibet Plateau,the thermal conductivity of unsaturated concrete at different curing ages under different constant curing ages under different constant temperatures is tested based on the steady-state method by using the thermal conductivity meter of heat flow method.The effects of different curing temperatures,curing ages and water cement ratio on the thermal conductivity of concrete are analyzed.The research results show that the thermal conductivity of concrete is negatively correlated with the water cement ratio and curing temperature,and the curing temperature has the greatest influence on the thermal conductivity of concrete,followed by the curing age.With the increase of curing age,the thermal conductivity of concrete shows a downward trend,and the decrease of thermal conductivity in the early stage of curing is greater than that in the late stage of curing.
关键词
低温/负温/导热系数/早龄期混凝土
Key words
low temperature/negative temperature/thermal conductivity/early age concrete
万方数据