International Journal of Materials Chemistry and Physics
Articles Information
International Journal of Materials Chemistry and Physics, Vol.1, No.3, Dec. 2015, Pub. Date: Jan. 9, 2016
Influence of Load Repetitions and Heating on Micro Crack Healing of Asphalt Stabilized Subgrade Soil
Pages: 395-401 Views: 1650 Downloads: 1002
[01] Saad Issa Sarsam, Department of Civil Engineering, College of Engineering, University of Baghdad, Baghdad, Iraq.
[02] Siham Almas Barakhas, Department of Civil Engineering, College of Engineering, University of Baghdad, Baghdad, Iraq.
The implication of asphaltic materials into the subgrade soil is referred as asphalt stabilization, it usually changes the whole geotechnical properties and behaviour of the soil under repeated loading applied by vehicles through the pavement system. The asphalt material supports the cohesive property and bind the soil particles through the thin film of asphalt, it also introduces some elastic property and introduce the resilience action against deformation under repeated wheel loading. Due to aging and continuous loading, micro cracks will initiate indicating the starting point of distress. This work investigates the possibility of micro crack healing when exposing the cutback asphalt stabilized layer to external heating. Stabilized soil specimens of 100 mm diameter and 200 mm height have been prepared in the laboratory at optimum asphalt content, and at one percent of asphalt above and below the optimum. Specimens were cured for one week at laboratory environment, then the specimens were subjected to repeated compressive stress at 20°C using the Pneumatic repeated load system (PRLS). The test was stopped after a predetermined number of load repetitions, the specimens were released from the testing chamber, and stored in an oven at 60°C for 120 minutes, and then the specimens were cooled to 20°C for 60 minutes, fixed at the testing chamber, and subjected to another cycle of repeated compressive stresses. It was concluded that The resilient modulus was increased by (50, 4, and 17)% due to healing process at asphalt content of (5, 6, and 7)% respectively, while the permanent deformation and initial deformations have decreased due to crack healing by (71, 7, and 56)% and (44, 37, and 42)%, respectively for asphalt content of (5, 6, and 7)%.
Crack Healing, Asphalt Stabilization, Cutback, Subgrade, Repeated Compressive Stress
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