Effect of polymer content on mechanical properties of thin spray-on liner

摘要

The use of Thin Spray-on Liner (TSL) as an alternative to shotcrete has drastically increasedrnsince 1990s when it was first developed and introduced to mines. In this study, tensile strength test, bond strengthrntest, compression test with specimens coated byTSL, and two kinds of bending tests proposed byEFNARC(2008)rnwere performed with two kinds of TSLs with different material compositions in order to evaluate their supportrncapacities. As a result, both TSLs were shown to be satisfactory for the minimum performance requirements forrna structural rock support suggested by EFNARC (2008) and tensile strength of a TSL was shown to increasernas its content of polymer was higher. In contrast, its bond strength was shown to increase proportional to therncontent of a cementitious component especially at the early age.