Evaluating the effect of autoclave curing on the microstructure and compressive strength evaluation of a high strength concrete

High strength concrete is usually cast with low water-to-binder ratio (w/b) in order to produce a compact microstructure high and durability. Autoclave curing can accelerate cement hydration pozzolanic reactions further modify of pastes (such as decreasing the Ca/Si forming crystallized calcium silicate hydrate). The present paper evaluates effect w/b ratio, range 0.20 – 0.40, on compressive strength, porosity concrete. Some samples were subjected autoclave evaluate this process parameters evaluated. was evaluated using X-ray diffraction scanning electron microscopy. results show decreased when from 0.40 0.30 thereafter total remained virtually constant while water permeable increased. An inverse relationship observed between strength. affects significantly phases developed hardened It accelerates reactions, interfacial transition zone triggers formation crystalline C-S-H. These changes reflect improved at but its negligible moderate ratios.