Capillary pressure in fresh cement-based materials and identification of the air entry value

Plastic shrinkage in fresh cement-based materials is caused by capillary pressure in the pore system. Within the first few hours after casting, evaporation results in the loss of water and possibly in the formation of menisci in the water surface between the superficial solid particles. With decreasing radius of the menisci the capillary water pressure rises. At a certain pressure, the system becomes unstable and air penetrates into the system....