Tunnel Guard is being increasingly promoted as an applicable replacement for shotcrete in many underground support applications. A number of laboratory and field tests have been performed over the last few years, aiming at a better understanding of the properties of Tunnel Guard, as well as characterising the Tunnel Guard interaction with rock. The following tests are considered to be most relevant in defining Tunnel Guard properties, and the research effort so far has been mainly spent on these tests: tensile strength (elongation), adhesion (bond) strength, effect of temperature, effect of water/humidity, acid and base resistance, flammability, impact strength (abrasion) and toxicity. In all of the above, Tunnel Guard is superior to shotcrete.

Below is a graph done by the University of Witwatersrand Johannesburg. The graph shows the tensile strengths of Tunnel Guard in its new development. As you can see, our strengths have almost doubled at only 8 days of curing time in this new development. Once we have completed our testing, this new Tunnel Guard will replace our current Tunnel Guard supply.