Sika® Rugasol® C Concrete Retarders / Concrete Surface.. WebSika® Rugasol® C is a liquid retarder for horizontal surfaces to exposed aggregate work or for producing a mechanical key to construction joints, stop ends or subsequent screeds applications. The retarding compound in Sika® Rugasol® C combines with cement at the.

WebSurface Retarder. By washing the concrete surface, the cement is rinsed off and the aggregate exposed. This gives the surface a unique optical effect that is also non-slip. Deactivators and acidifiers can be used to.