Laboratory Evaluation of Moisture Damage in Asphalt Mixes

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Addis Ababa University


Moisture damage usually called stripping happen when water infiltrates between an asphalt film and the aggregate surface, and replaces the asphalt aggregate's coating. These situations cause a loss of bond between the aggregate and the asphalt cement. The most serious consequence of stripping is the loss of strength and integrity of the pavement which result in premature failure of asphalt pavement. Moisture damage contributes significantly to the premature deterioration of asphalt pavements, which, leads to an increase vehicle operating cost and maintenance costs of a pavement. These conditions also make driving dangerous, and driving comfort and safety are often compromised. This thesis utilized laboratory evaluations to study the effects of moisture damage in asphalt mixes. Two different sources of aggregates and one type of asphalt binder were used. The aggregates quality test were conducted namely Los Angeles abrasion, soundness loss, sand equivalent, flakiness index, specific gravity and absorption. The asphalt binder conventional tests were evaluated which were flash point, ductility, penetration, thin film oven test, softening point and solubility. Marshal Flow and stability test were conducted. Moisture susceptibility using indirect tensile strength test and single wheel tester were performed. The quality test results of the aggregates and the bitumen were met the specification set by ERA. From the aggregate test result the more strong, the higher weathering resistance and the lesser water absorbent aggregate found to be less moisture sensitive. The research conclude that moisture in asphalt mix has a significant effect on the performance of asphalt mix which is decrease in Marshal stability, decrease in tensile strength and increase the rutting of a mixture. The test result from ITS show that the tensile strength values were higher for the dry specimens than the wet specimens. From wheel tester result the rutting of a mix were higher for the wet samples than the dry one.



Hot Mix Asphalt, Moisture Susceptibility, Stripping, Tensile Strength, Rutting