INTRODUCTION The efficient repair and replacement of concrete pavements and bridge decks often requires rapid setting material that can be placed , cured , and opened to traffic in a relatively short period of time . Sev - eral repair materials are marketed for the repair of deteriorating concrete structures . These repair materials are classified into different types , such as cement , epoxy resins , polyester resins , polymer latex and polyvinyl acetate . Cement - based mater - als and polymer / epoxy resins are the most widely used among the repair materials Calcium aluminate cement ( CAC ) has several important characteristics including early strength gain . chemical resistance and excellent refractory properties . Accelerated OPC and CAC work very well at20 ° C , but their perform - ances decrease at 5 ° C . In the present study , calcium sulfoaluminate cement ( CSA ) has been introduced in mortars either as binder or as CAC accelerator to get good perform- ances at 5 ° C in two cases :