Abstract
This 50 years program was started at 1952. Durability of cement hardened as mortar (4×4×16cm, W/C=65%) and concrete(15×30cm, W/C=53%) has been investigating. The mortar is stored in water and the concrete is stored in water or air. The commercial or experimental cements are 13 types including High early, Ordinary, Moderate heat, Low heat, Slag, Silica and etc.. This experiment evidences cement hardened having long-term durability in strength and modulus of elasticity. Carbonation depth reached 26.3mm for High early, 45mm around for Ordinary and the center for Low heat.
This well organized program can deriver one of the first result in the world. I deeply show respect to forerunners who promoted this program and were making constant efforts on running this program and also acknowledge to make me be the contributor.
