The present investigation was carried out lo study the adhesion of bonding cement mortar to def ( 〕rming super workable concrete substrate , The specimens were tited using the prefabfication methed and Ihe manual method . The compressive load was applied on the specimens , and thecritical concrete strain before tile separation was measured , As a result, the critical concrete strain of super workab 【 econcrete was ] arger thall that ofordinary concrete . And incase of rnanual method , the critical cencrete strain ofthe specimen tiled on uneven concrete surface was [ arger than that of the sp imen ti[ ed on flat cGncrete surface , 1 .は じ め に