Sika® ViscoFlow® 77 is a workability enhancing admixture for concrete. It is a plasticiser / water reducer based on specially developed Sika ViscoFlow® technology which gives concrete, long to extremely long workability retention. Sika® ViscoFlow® 77 can be used alone with weakly alkaline cements or in conjunction with another Sika water reducer as a workability regulator with medium or strong alkaline cements.