Effect of rebar as a restraint against plastic shrinkage and settlement of self-consoliadting concrete

Plastic shrinkage and settlement occurs when concrete is in the fresh state. In reinforced concrete structures, the presence of rebar is effective on the shrinkage and settlement. In this study, four types of self-consolidating concrete(SCC) that are evaluated including: simple self-consolidating concrete (S), SCC containing silica fume (SS), SCC containing silica fume and styrene butadiene rubber latex (SSL) SCC containing silica fume and styrene butadiene rubber latex and fiber (SSLF). Then effect of changing in rebar placing on plastic shrinkage and settlement of SCC has been evaluated. The results show that reducing the height of the rebar placing in concrete (reducing in concrete cover), cause to change cracking due from plastic shrinkage to plastic settlement. Therefore cracking pattern has changed from Angle to the vertical. SCC containing fibers and latex shows the lowest plastic shrinkage and settlement and cracking area. Also cracking has not been observed in SCC containing fibers (SSLF).