Abstract：
Some polypropylene fiber was added in mortar for improving its impermeability; and the flexural compressive, compressive strength, splitting tensile strength and permeation height of the hardened mortar were tested. The result showed that some polypropylene fiber could obviously improved the impermeability of hardened mortat because it could decrease the Stress Concentration on crack tip- and inhabit the further development of the cracks, and that some polypropylene fiber could effectively restrained the plastic cracks on the surface of mortar because it could prevent plastic mortar from water loss and volume shrinkage.
