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REVIEW OF ACCELERATED AGING TECHNIQUES
MATERIALS AND APPARATUS
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20 WEATHERING TIME—HOURS 50 hours 85-100 penetration grade absolute viscosity age hardening APPENDIX asphalt samples asphaltic material Chapter Cornell University decrease determined dispersion ductility durability of asphaltic dv/dr effects of ultraviolet elastomers equation EXPOSURE APPARATUS exposure period film thickness hardening of asphalt high temperatures Increases infrared lamps infrared radiation investigation laboratory light sources log log viscosity log v2 log viscosity versus low temperature Monismith natural radiation neoprene latex obtained original asphalt penetration grade asphalt penetration retention Penetration values PIate poises Pyrex radiant energy reactions ro CM ro ro Rubarite rubber addition rubber blended RUBBER INTO ASPHALT rubberized asphalt shear rate shearing stress sliding plate microviscometer Slope soft too soft straight line sunlight surface susceptibility factor Syneresis temperature susceptibility test results thesis thin film Thixotropy ultraviolet and infrared ultraviolet radiation ultraviolet range viscosity-temperature relationships Volatilization wave lengths weathering agents weathering apparatus weathering tests WEATHERING TIME—HOURS FIGURE yield point