Influence of Polypropylene Fiber on Tensile Property of a Cement-Polymer Based Thin Spray-On Liner

Abstract

The influence of a polypropylene fiber on the tensile properties of a cement-polymer based thin spray-on liner (TSL) was investigated in this study. Two different contents of fiber were added to the liner, yielding two TSL groups. Tensile tests were performed (in accordance with the ASTM D638 standard) on the two groups of specimens as well as the control group at 1, 7, 14, and 28-day curing. The test result verified the large plasticity and low elastic modulus of the TSL compared with the fiber. SEM examination revealed that fibers lying parallel to the load direction ruptured or were pulled out from the matrix, which was beneficial to the tensile strength, but detrimental to the elongation because of their high stiffness. Other fibers lying perpendicular with the load direction were detrimental to both tensile strength and elongation through aggravating the propagation of the cracks. The tensile strength was improved by fiber incorporation, while the elongation was reduced at all curing. The influence of fibers on tensile toughness was uncertain since tensile toughness depended on strength as well as deformity.

Study on Antiweathering Support Technology of Thin Spray-On Liners in Shallowly Buried Coal Seam Roadway under Corrosion Condition

“…For the anchor rods (ropes) that penetrate into the inner part of the rock, a modified version of chlorinated polyethylene resin with rust remover is applied to the surface of the anchor rods (ropes) before installation to prevent them from rusting. is thin spray-on liner is based on TSBP/3.0 type inorganic material, which can resist corrosion and weathering by spraying the liner after mixing with water, its elasticity and ductility are good, its tensile strength is high, and it can adhere well to the sprayed surface [25][26][27][28]. e specific downhole construction process is shown in Figure 9.…”