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Pavement Review Test 1

Pavement Review Test 1 - HISTORICAL BACKGROUND*First...

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HISTORICAL BACKGROUND *First asphalt road in USA – 1870 Newark, NJ *First street in USA – 1876 Pennsylvania Ave., D.C. *~ 95% paved roads surfaced w/ asphalt concrete *cement concrete pavement first road – 1908 Detroit, MI WHY DO WE NEED DESIGN? *pavement to carry load of traffic so won’t fail quickly *design pavement so it can provide desired period of quality service under traffic loading smoothness and comfort texture, friction and safety structure integrity rutting, fatigue and thermal cracking faulting, pumping, corner cracking *concrete’s rigidness spreads load over large area and keeps subgrade pressures low DISTRESSES *day: expansion (arch-like curling) *night: contraction (U-shape curling) PERMANENT DEFORMATION (RUTTING) – function of warm weather and traffic FATIGUE CRACKING – function of repeated traffic loads over time (in wheel paths) (looks like dried up desert) THERMAL CRACKING – function of low temperature CONCRETE PAVEMENT *STRUCTURAL DISTRESS - cracking, joint/crack deterioration, durability, punchouts *FUNCTION DISTRESS - faulting, noise, surface polishing and defects PAVEMENT DISTRESS TYPES *TRANSVERSE CRACKING - loading, curling/warping, long joint spacing, support loss, settlement/heave, shallow/late joint sawing *CORNER CRACKING - support loss (pumping of fines), long joint spacing, curling/warping, settlemenr/heave *LONGITUDINAL CRACKING - near centerline: shallow/late joint sawing, long joint spacing - near edge: loading, support loss, settlement/heave *INTERSECTING CRACKS - support loss
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*JOINT/CRACK DETERIORATION - incompressible in joint/crack, material durability, metal/plastic joint inserts (extreme cases can cause blow-ups) *D-CRACKING - D-shaped, hairline cracks near joints and cracks *poor quality aggregate, water in pavement, freezing temps *ALKALI-SILICA REACTION (ASR) - map cracking pattern w/ cracks oriented parallel to slab-free edges * chem. rxn b/t alkalis in concrete and certain siliceous aggregates * forms alkali-silica gel that absorbs water, expands and cracks concrete *PUNCHOUTS
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