Engineering Sound

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Road Superelevation (or banking)—the science of tilting roads to fight centrifugal force! ​

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How to Estimate Road Earthwork (Cut & Fill) Learn the basics of road earthwork estimation using the Cut & Fill method. This guide explains excavation, embankment, and the Average End Area Method with a simple example for accurate volume calculations.

RUNWAY RUBBER DEPOSIT REMOVAL Airfield Pavement Friction & Safety Management Runway rubber deposit accumulation is a critical airfield pavement maintenance issue affecting runway friction characteristics, aircraft braking efficiency, and wet runway operational safety. During aircraft touchdown, tires rapidly accelerate from zero rotational speed to landing speed, generating intense frictional heat and depositing rubber particles onto the runway surface, primarily within touchdown zones and aircraft wheel paths. As rubber accumulation increases, pavement macrotexture and groove effectiveness gradually reduce, resulting in: * Decreased skid resistance × Reduced braking action _Loss of directional controllability Reduced surface drainage capability X Increased hydroplaning potential X Deterioration of wet runway performance Critical Rubber Accumulation Areas Runway touchdown zones Main wheel path regions High aircraft movement landing areas First 900-1200 m of runway pavement Runway Surface Monitoring & Inspection Typical runway surface evaluation includes: V Continuous Friction Measuring Equipment (CFME) testing V Surface texture depth assessment V Groove condition inspection V Drainage performance evaluation V Visual rubber contamination assessment Friction testing is generally performed along aircraft wheel paths approximately 3 to 6m from the runway centerline.