Laboratory Performance Evaluation of Hydrated Lime Additives on Moisture Susceptibility of Water-Based Foamed Warm Mix Asphalt (WBFWMA) Mixtures
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Date
2025-03
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Addis Ababa University
Abstract
Warm mix asphalt (WMA) technology is recently developed and includes organic and chemical
additives as well as water-based process (foaming effect), known for its environmental benefits,
allows asphalt materials to be produced, placed and compacted at a relatively lower temperature
than hot mix asphalt (HMA). This study evaluates the moisture sensitivity of water-based
foamed warm mix asphalt (WBFWMA) by utilizing the hydrated lime additives as anti-stripping
agent. The performance test was conducted with modified Lottman test for two nominal sizes of
aggregate (20mm and 14mm). Statistical analysis using two-tailed t-test was also conducted to
check the significance of the test result. The test result indicates that WBFWMA is more
sensitive to moisture induced damage than HMA. However, the ITS value for lime-modified
WBFWMA is comparable to HMA, revealing that it provides similar performance along with
added environmental and cost benefits. The result recommended the use of lime-modified
WBFWMA for its environmental and safety advantages.
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Keywords
Anti-Stripping, Foamed Bitumen, Hydrated Lime, Hot Mix Asphalt, Indirect Tensile Strength, Marshall Mix Design, Moisture Susceptibility, Tensile Strength Ratio, Warm Mix Asphalt