Abstract
Expansive-shrinkage strains of uniaxially restrained expansive concrete were obtained by A type and B type specimens specified in JIS A 6202 “Expansive Additive for Concrete”. Uniaxially restrained expansive strains obtained by A type specimens were almost the same as the values by B type. Drying shrinkage strains obtained by A type specimens were also almost the same as the strains by B type, up to a limit value. However, beyond the limit value, the shrinkage strains obtained by B type were larger than the values by A type. Drying shrinkage strains on the surface of concrete obtained by contact type strain-gauge were larger than the values of restraining bar obtained by dial gauge. Instead of B type, A type specimens can be adopted to measure shrinkage strain as well as expansive strain.
