Abstract
To ensure durability of the concrete structure, it is necessary to control crack of concrete properly. Target value of shrinkage strain of concrete is mentioned in the specification of JSCE（Japan Society of Civil Engineers）and AIJ（Architectural Institute of Japan）, and due to recent trend, it will be specified as one of material property during design stage in near future. To take concrete mix proportion design with shrinkage strain effect, it is necessary to know the influence that mix proportion condition exerts on shrinkage strain, and the quantitative effects of various shrinkage control measure. Therefore, standard test of length change of concrete prism has conducted to examine the shrinkage strain effect by concrete mix proportion and several shrinkage reduce measure. As a result, the output is summarized as follows；1）The shrinkage strain of concrete increases approximately 20 micron in case unit water weight of concrete increases every 10kg/m3. 2）The water reducing agent with shrinkage-reducing function helps shrinkage reduction of approximately 15％（100 micron）than normal type. 3）Lime stone aggregate helps shrinkage reduction of approximately 15％（100 micron）than using hard sand stone aggregate. 4）The shrinkage strain will be reduced in case exposure to dry condition is delayed with long curing period.
