Lecture7_-_testing_&_construction

Lecture7_-_testing_&_construction - Asphalt Cements New...

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1 Asphalt Cements 1 New Superpave P erformance G raded Specification Some slides are courtesy of FHWA Direct Tension Test 2 FHWA Courtesy of FHWA Direct Tension Test Δ L Load Stress = σ = P / A σ f 3 Δ L e Strain ε f
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2 L Load L + Δ l Δ l L e Effective Gauge Length (L e ) Load Failure Strain ( Ε f ) = Change in Length ( Δ L) DIRECT TENSION TESTER Evaluates Low Temperature Ability to Stretch Stress Brittle Strain Brittle-Ductile Ductile Direct Tension Test 6 Courtesy of FHWA
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3 SPECIMEN PREPARATION ± Silicone Rubber Mold ± 4 Specimens per Test ± Fill Mold with Binder ± Cool Silicone Rubber Mold ± Trim ± Demold End Inserts Asphalt Poured Here BINDER AGING ± Why Testing? ± simulate various stages of binder aging ± transport, storage, and handling ± construction ± In-service ± Methods: ± Rolling Thin Film Oven ± simulates aging from hot mixing and construction ± determines mass loss ± Pressure Aging Vessel ± simulates long term aging ± Output ±
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Lecture7_-_testing_&_construction - Asphalt Cements New...

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