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CC8 TM and CC13 TM were specified for the project and dispensed in bulk rolls from a spreader beam and plant equipment. The material was unrolled and cut to length on site, minimising waste as lengths were cut to match each section of the channel’s profile. No perishable formwork or additional reinforcement was required. CC layers were laid transversely across the width of the channel, with subsequent layers overlapping by 100mm and beaded with Sikaflex 1A adhesive sealant to create water tight joints. Overlaps were jointed using 25mm screws to ensure intimate contact with the substrate. Where possible, end edges were buried with loose shale and aggregate to prevent water ingress under the CC and provide a neat termination. The channel was excavated from a blasted rock substrate, with some sections reinforced with concrete block work. CC layers were pinned into position at the top of the profile using 10” Ardox galvanised spikes. When fixing CC to the concrete block work, Hilti rock anchors were used. The channel terminated in a 4m diameter corrugated steel and concrete block work culvert and sump which was also lined with CC to ensure minimum water loss.This was imperative as the water was contaminated from tailings and could not come into contact with any other water sources.
Large settling pond collecting effluent from nearby Willow Creek mine
CC bulk rolls dispensed using spreader beam and plant
Excavating sump and constructing culvert
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