Abstract：
The thermal dilation coefficient development of early-age concrete with different w/b ratios has been investigated with an approximate testing method. This study results show that the thermal dilation coefficient of hardening concrete changes significantly at very early age, and then it decreases to a stable value after the first day. A simple and applicable model of thermal dilation coefficient for early-age concrete has been revised, with which deformations and thermal stresses in early-age concrete can been calculated approximately.
