Remediation | Loch Goin, Scotland, UK

1,250m² of CC8^® installed to remediate a dilapidated spillway

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Project Overview

In July 2017, Concrete Canvas ^® GCCM (CC) was used to remediate a dilapidated concrete spillway as part of remediation works at Loch Goin Reservoir in Eaglesham, Scotland. The spillway structure principally comprised of an unreinforced concrete channel cast insitu. The condition of the spillway was poor in significant areas and some localised repairs had been carried out in the past. The deterioration to the structure is consistent with frost damage.

Original concrete spillway channel, vegetation removed & voids filled in, CC8^® Bulk Roll cut to length, Batched lengths laid transversely across the channel

1250m²

of CC8^® used to remediate concrete spillway

250m²

installed per day

5 Days

to complete by a 5 man crew

Solution

Rather than using conventional concreting techniques to repair the channel, CC was chosen on a cost and time basis as well as a trial for this new technique for the client. The CC solution would also maintain channel capacity.

CC8^® overlaps fixed at 600mm spacings

CC lined spillway channel with steel batten bar termination at siphon outlet

Design & Installation

CC8^® Bulk Rolls were specified
Spillway was cleaned of vegetation and minor repairs were carried out
Bulk Rolls cut into hand portable Batched Rolls
Transverse layup
Mechanical fixing joints
Perimeter edges secured within anchor trenches using steel pegs
Hydrated using a nearby stream

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Anchor trenches backfilled on either side of channel

Summary

Despite the difficult access to site and challenging weather conditions, a total of 1,250m² of CC8^® was installed in 5 days by a 5-man crew. The contractor used an efficient process, whereby the 2 men cutting the CC material matched the speed of the 3-man crew simultaneously installing the material in the spillway. This allowed them to install up to 250m² of CC per day.

The CC was able to easily accommodate significant variations in slope and profile, along with interior and exterior pipe protrusions and perforated pipe discharge points. CC also has a very low wash out rate and low alkali reserve meaning that it was not required to treat the run off from installation.

CC terminated into anchor trench and backfilled with concrete

The client was impressed with the speed and ease of installation and are satisfied that the CC material will provide a long-term solution that greatly increases the operational life of the structure, mitigating the need for costly periodic maintenance repairs in the near future.

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