Equipment World

June 2016

Equipment World Digital Magazine

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PART WINNING BONUS the 6 WINNING BONUS the Part I: Smooth Pavements through Cold Milling Part 2: Smooth Pavements and Material Transfer Vehicles Part 3: Smooth Pavements and Asphalt Pavers Part 4: Smooth Pavements and Asphalt Screeds Part 5: Compaction for Super Smooth Asphalt Pavements Part 6: Super-Smooth PCC Pavements with Slipform Pavers Part 7: Super-Smooth PCC Pavements with Stringless Controls This month, Equipment World continues its seven-part series on how to optimize pavement construction to win bonuses through an examination of PCC pave- ments with slipform pavers. road science | by Chris Hill | ChrisHill@randallreilly.com EquipmentWorld.com | June 2016 65 HOW TO ACHIEVE BONUS-WINNING SMOOTHNESS S lipform pavers spread out, form and, depending on attachments, apply an initial fi nish to the surface of low- slump Portland cement concrete (PCC). The paver is pulled over the PCC, slipping over the material, hence the name. The process is similar to extrusion, but instead of the material moving, the machine itself is moving. PCC running through a slipform paver passes through an auger spreader, a spreader plower, strike-off plate, vibrators and or tampers and a conforming plate. It then goes through the fi nish- ing screed, which produces the fi nal shape, fol- lowed by a fl oat or hand fi nishing. These machines provide a continuous and seamless concrete pavement surface and by na- ture give a smooth surface, without having joints. These machines must work on a stable subgrade, since lack of a stable subgrade can cause thick- ness control and profi le problems. Paving in this manner also requires a steady supply of material be available. As with asphalt paving, an inconsistent pace, including stops, along Guntert & Zimmerman S600 multi-purpose slipform paver used for paving city streets, secondary roads, highways and airports. SLIPFORM CONCRETE PAVERS

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