Experimental study on early autogenous shrinkage of 20m-span low-height reactive powder concrete T-beam

Steel string strain gauges are pre-embedded in ten pieces of 20m-span low-height reactive powder concrete(RPC) T-beam to test the changing law of early shrinkage along the height of T-beam´s section. According to this law, self-restraint stress which comes out of uneven shrinkage of RPC, and easy cracking dangerous areas which are caused by self-restraint stress, are both analyzed. Then S.Miyazawa & T.Kuroi & E.Tazawa autogenous shrinkage model is adopted to do regression analysis, obtaining certain parameters and the autogenous shrinkage strain-time curves of top slabs, webs and base plates.