THE STUDY ON MECHANICAL PROPERTIES OF VARIOUS FIBER REINFORCED CEMENT-BASED COMPOSITE CEMENTITIOUS MATERIALS

Fiber can improve the bending strength of cement mortar or concrete due to its high toughness. The straw fiber, SF and PF with different properties were mixed into the mortar in the same proportion and different mixing processes to prepare mortar specimens, and the different types of fibers were mixed for the standard curing 7d and 28d. The mechanical properties of the test piece affected the change in this study. The results were showed as follows: the strength of the mortar with straw fiber was higher than that of the post-mixing method, and the flexural strength (referred to as FS) was increased by about 16.0%; the FS of the mortar after the SF was added by 9.7% higher than that of the first blending method, but the compressive strength(referred to as CS) of the first mixed mortar was higher than that of the post-mixing method 16.9%, indicating that the SF had a high modulus of elasticity, which could improve the CS; the growth trend between the FS and CS of the mortar were close with PF. Under the SF first mixing process, the CS was maximized, followed by the PF at the post-mixing method, and the worst was the post-mixing method of the straw fiber.