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CE332 Test 3 - 02

PG

TermDefinition
PG Component definition PG 64 - 22 GP - Performance grade 64 - Average 7 day max pavement temperature 22 - Min Pavement Temperature
Critical Distresses: Rutting - Deformation Critical conditions: - High Temperature - Slow Speeds
Critical Distresses: Fatigue Cracking - Cracking Critical conditions: - Intermediate Temperatures - Repeated traffic loading
Critical Distresses: Thermal Cracking - Transverse Cracking - Caused by contraction of binder upon cooling Critical conditions: - Low Temperatures - Not traffic related
PG test methods: Rolling Thin Film Oven (RTFO) - Simulates short term aging during mixing and construction - Exposes films to heat and air flow - Measures mass loss
PG Specification: Volatization - Based on RTFO - Temp 163C - Max loss of 1%
PG test methods: Pressure Aging Vessel (PAV) - Simulates long term aging, 7-10 years of service - Must be conducted on RTFO samples!
PG test methods: Rotational Viscometer (RV) - Performed on unaged binder - Measures torque required to rotate spindle submerged in asphalt - You want asphalt to be fluid enough to mix
PG test methods: Dynamic Shear Rheometer (DSR) - Asphalt is sandwiched and the torsion is measured - |G*| Dynamic shear modulus (stiffness indicator) - δ Phase angle (viscous vs elastic behavior) Higher |G*| = Higher stiffness Higher δ = More viscous
PG Specification: Dynamic Shear High Temp - Addresses Rutting - Tested on unaged (DSR) and RTFO binder - |G*| / sinδ
PG Specification: Dynamic Shear Interm Temp - Addresses fatigue cracking - Tested on long term aged (PAV) - |G*| * sinδ
PG test methods: Bending Beam Rheometer (BBR) - Evaluates resistance to thermal Cracking - 3 point bending test at low temperature
Grade bumping - Only applies to high temperature - Dependent on ESALs and traffic
Created by: BrendaTovar3223
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