机场摊铺技术 Airport Paving.pptx

Nova Scotia Asphalt User Producer Group Annual Seminar April 12th, 2012 Ryan S. Clark Airport Paving Outline Background – What’s different About Airports/ Runways? Airport Specifications Joint Construction Options CFB Shearwater Heliport Conversion HIAA Specification Changes How’s it’s different from Highway or Street Paving Airport Paving Typically Long/Straight Changing gradients, curves and slopes to accommodate efficient construction. Traffic runs in wheel paths – Loads are restricted by governments to preserve infrastructure. Joints are constructed out of wheelpaths Built on a gradient to shed water and protect public travelling at high speeds. About the roads we love to PAVE How’s it’s different from Highway or Street Paving Airport Paving They are wide and flat, so airplanes can land, with many potential joints No Traffic Heavy Loads. What About Runways then? How’s it’s different from Highway or Street Paving Airport Paving Water must absolutely drain. If you think cars are bad hydroplaning you should try it with aircraft tires. There’s no traffic to get additional compaction so you need to achieve as close to 4% voids in place as possible. Turbine engines to not like rocks.. Foreign Object Debris (FOD) is avoided like the plague at any airfield.. So pavements that ravel at all are not tolerated. Likewise, joints cannot ravel or crack. Things To Consider Materials Design How Do Specifications Differ? Asphalt that has a closed surface texture to prevent raveling, and improve density Gradations are typically finer, and use less compactive effort in the design to force more liquid asphalt in the mix, helping compaction in the field. Transport Canada Guidelines are historically 50 Blow Marshall mixes, with very high natural sand contents. Asphalt Mix Design Construction How Do Specifications Differ? Density Requirements are higher, typically 94% of Maximum Density ( compared to 92.5% for typical Highway Mixes) Runways Typically have a joint density Specificatio