Authors: Chang, S-H; Choi, S-W; Lee, C; Kang, T-H; Kim, J; Choi M-S
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Four thin spray-on liner (TSL) mixtures were produced and tested based on the performance requirements specified by EFNARC (2008). They generally showed good tensile and bond strengths; however, one powdertype TSL mixture was shown to be unsuitable as a permanent support member (a ‘Class S’ TSL), because its elongation at break was much lower than the EFNARC (2008) specification. Two-component TSLs consisting of a liquid polymer and a powder binding material were more ductile and generally performed better than the one-component powder mixtures. Their high ductility resulted in increased elongation at break, even though their tensile strengths were slightly lower than those of the one-component powder TSLs. One prototype two-component TSL produced here satisfied every criterion specified by EFNARC (2008). Notably, it increased the average compressive strength of mortar specimens by over 20% even when coated to a thickness of only 3 mm. Keywords: thin spray-on liner, one-component, two-component, rock, support

Keywords: thin spray-on liner, one-component, two-component, rock, support

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