TENSILE STRENGTH AND STIFFNESS MODULUS OF FOAMED ASPHALT APPLIED TO A GRADING REPRESENTATIVE OF INDONESIAN ROAD RECYCLED PAVEMENT MATERIALS

Abstract

Saving energy and sustainable construction are becoming important issues in pavement engineering. These issues constitute a strong incentive towards the use of foamed asphalt technology worldwide. Unfortunately, there is no current research attempting implementation of foamed asphalt technology in Indonesia. Therefore, this paper contributes an important figure of cold recycling construction in which a deteriorated pavement with a grading representative of Indonesian road was stabilised using foamed bitumen. The specimens containing 2% foamed bitumen were fabricated with diameter 100mm and height 50mm. The specimens were cured at ambient temperature prior to tensile strength and stiffness modulus testing at various curing period. The results have provided preliminary indication of foamed asphalt characteristics. During curing period, the properties can be identified into 3 stages; (1) moisture dependent region in which the tensile strength and stiffness modulus increase with time due to loss of moisture, (2) critical region in which the correlation between moisture and properties is not clear and affected by temperature regime, and (3) ageing or loss of latent moisture region in which the properties is predicted increase with longer curing time. The correlation between tensile strength and stiffness modulus has been established in which its stiffness (MPa) is about 4 times of its strength (kPa).