Effect of Polypropylene Fiber on Performance of Phosphorus Slag Mortar

Abstract

Cement, phosphorus slag, silica sand, fly ash and water reducing agent were well-mixed, and then stirred with polypropylene fiber and water for preparation of phosphorus slag mortar. Performance of the mortar was tested according to relevant standards. The results showed that polypropylene fiber can improve flexural strength and tensile bond strength of the mortar. However the polypropylene fiber has little contribution to the compressive strength of the mortar. Fluidity of phosphorus slag mortar reduces with length of the fiber increasing. Polypropylene fibers distributed evenly in the phosphorus slag mortar can obstruct generation and propagation of micro cracks, thus crack-control property of mortar can be improved. When polypropylene fiber’s length and content are 10 mm and 4 g (by weight) respectively, the properties of phosphorus slag mortar are as follow: fluidity 209 mm, tensile bond strength 0.71 MPa, flexural strength 4.32 MPa, Compressive strength 10.83 MPa, and ratio of compressive strength to flexural strength 2.51 on 28 days.