Hardened properties and microstructure of SCC with mineral additions

摘要: Abstract The paper investigates the effects of three active mineral additions (AMA): microsilica (MS), nanosilica (NS) and metakaolin (MC), on hardened properties, microstructure mechanical performance self compacting concretes (SCC) with limestone filler (LF). Compressive strength, P- S-waves Ultrasonic Pulse Velocity (P- S-UPV) SCC were jointly studied porosity water vapor permeability (WVP) paste samples covered uncovered plastic film during setting time, simulating two environmental conditions early ages (EA). interfacial transition zone (ITZ) was also examined using scanning electron microscopy (SEM). Substitution 50% cement by LF significantly reduced density, stiffness compressive strength while slightly increased WVP in comparison reference SCC. use AMA presence size large Portlandite crystals ITZ concrete, but that did not improve (ultrasonic modulus elasticity). moderately phase, which would expect to durability concrete. It deduced correlated rather than pore or tortuosity. pastes followed a different pattern regarding porosity. Depending LF, without it decreased its absence, depending AMA’s pozzolanic activity. curing at EA affected properties paste’s as larger evaporation for porosity, tortuosity WVP, although average diameter.