In situ measurement of coefficient of thermal expansion in hardening concrete and its effect on thermal stress development

► A time-dependent variation of CTE in hardening concrete was examined in situ. ► A particular device called impervious non-stress cylinder was used. ► The CTE at setting time was about twice as high as the CTE in the stabilized stage. ► The time-dependent CTE may be important for assessments of early-age cracking potential.