Extent and mechanisms of gloving and unmixed resin in fully encapsulated roof bolts and a review of recent developments

Gloving, in this context, refers to the plastic cartridge of a resin capsule partially, or completely, encasing a length of bolt, typically with a combination of mixed and unmixed resin filler and catalyst remaining within the cartridge. The gloved and unmixed portion reduces the effective anchor length and adversely affects the ability to reinforce the roof strata. Figures 1, 2a and 2b illustrate typical examples of gloved roof bolts and unmixed resin/catalyst.