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

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 standa...

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Bibliographic Details
Published in:Applied sciences 2019-07, Vol.9 (14), p.2876
Main Authors: Wei, Qun, Zhang, Nong, Feng, Xiaowei, Xie, Zhengzheng, Wu, Jiansheng, Cao, Juncai
Format: Article
Language:English
Subjects:
Cement
cement polymer-based
Coal mining
Concrete
Crack propagation
Curing
Elongation
Fibers
High density polyethylenes
Mechanical properties
Methods
Mines
Modulus of elasticity
Polymers
polypropylene fiber
Reinforced concrete
Sand & gravel
SEM
Shear strength
Stiffness
tensile
Tensile properties
Tensile strength
Tensile tests
thin spray-on liner
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Summary: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.
ISSN:2076-3417
2076-3417
DOI:10.3390/app9142876