“If the machine is not in the correct location, the plans won’t load and the paver won’t operate using its automatic guidance capability,” he says. “We can operate manually, but using guidance delivers far greater operating efficiency.” As each layer is laid, the resulting asphalt course is checked immediately behind the screed box with the help of a total station, and then double-checked post compaction, working on a 10m x 2m surveying grid. “Every step of the process is measured and monitored to achieve the correct end result that is within tolerance,” he says. “We leave nothing to chance.” The P8820C was added to the Tarmac fleet three years ago, complete with a CBGM (Cement Bound Granular Mixtures) fixed screed, though the machine’s ability to also accept an adjustable asphalt screed has added operational versatility for the team. “The Volvo’s vibrating screed is highly effective at laying asphalt and it delivers a 92% compaction rate immediately behind the paver,” he says. “As a result of this efficiency, the quality of levelling is dramatically improved too and we can maintain an even temperature across the asphalt mat to improve the curing process.”
He adds that such a high degree of compaction from the
paver means there is less work for the smooth drum compaction rollers to carry out. “With the Volvo paver, typically only 5–10mm of final compaction is achieved using the rollers,” he says. “And that means better operating efficiency for us.” ■
Engineering supervisor, Ben Howard is pleased with the performance of the P8820C paver
WWW.YOUTUBE.COM/SMT_GB WATCH
THE VIDEO CONTINUED OVERLEAF a
Machine control and guidance comes from Topcon’s LPS/GPS to provide a high-quality and stable guidance, so each finished layer provides a very accurate and even surface to accept the next layer.
THE VOICE MAGAZINE No32 2018 9
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