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Influence of active filler, curing time, and moisture content on the strength properties of emulsion and foamed bitumen stabilized mix
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ABSTRACT: Foamed bitumen and emulsion are common stabilizing agents used for recycled asphalt pavement construction. The strength of emulsion and foamed bitumen stabilized Reclaimed Asphalt Pavement (RAP) is influenced by factors such as filler content, moisture level and curing time. This paper describes the effect of ordinary Portland cement as active filler, curing time and moisture content on the strength properties of foamed bitumen and emulsion stabilized mix. Foamed bitumen and emulsion treated samples with different RAP proportions were tested for their strength properties at various active filler contents, curing time and moisture contents. It was found that the strength in terms of resilient modulus, Unconfined Compressive Strength (UCS) and Indirect Tensile Strength (ITS) values, increased with curing time and percentage of active filler. It was also found that the strength decreased as the RAP proportion increased. However in construction practice, it is possible to use 100% RAP to meet the desired strength, when an adequate amount of active filler is added.