Mechanisms of autogenous shrinkage for Ultra-High Performance Concrete (UHPC) prepared with pre-wet porous fine aggregate (PFA)

Here, the intrinsic driving mechanisms of autogenous shrinkage for Ultra-High Performance Concrete (UHPC) incorporating porous internal curing (IC) medium are detailly investigated, including characterization and monitoring UHPC hydration kinetics, relative humidity (IRH) temperature (IT) fields. The results show that evolution prepared with pre-wet fine aggregate (PFA) undergoes multiple stages. potential expansion drivers IC at super early hardening period identified as extra liquid volume compensation effect thermal expansion. Furthermore, rapid growth stage matrix is governed by dynamic, while sustained managed cold shrinkage, chemical capillary pressure. Finally, feasibility Powers model in design wet PFA carefully revealed, key parameters obtaining advanced volumetric stability elucidated. strategy terms designed revealed.