Laboratory Investigation of the Use of Waste Recycled Polypropylene in Bitumen

Author
Azin Chitsazan
Department of Land Use Planning and Assessment, Science and Research Branch, Islamic Azad University, Tehran, Iran
10.22034/road.2024.203814
Abstract
The present study compares the performance of asphalt mixtures using montmorillonite nanoclay (MMT1) and sulfur as a modifier. The main objective of this study is to describe the physical and strength properties of MMT nanoclay and sulfur modified asphalt bitumen. In the experimental test, MMT nanoclay (2,4,6,8)%, sulfur (2,4,6,8)%, and MMT nanoclay-sulfur composite (2,4,6,8)% by weight of bitumen were mixed. After that, the effect of selected modifiers on physical properties, strength characteristics and moisture damage were evaluated. The addition of modifiers decreased the amount of penetration, while there was a significant increase in the softening point. Among all modifiers, the maximum stability value of 34.17 KN was reported with the addition of 4% of MMT nanoclay and sulfur as a combination, that is, 2% of MMT nanoclay and 2% of sulfur as a composite (50:50), which is 2.8 times the stability of asphalt mixture. The base is in the optimal bitumen percentage of 2 (OBC). MMT nanoclay-sulfur composite was the most effective composition in improving moisture sensitivity because the tensile strength ratio (3TSR) values ​​were relatively higher than 90%. Overall, the addition of MMT, S, MMT nanoclay-sulfur nanoclay composites improved the cracking resistance and reduced the potential for moisture damage under all test conditions.
Keywords
Montmorillonite Nanoclay (MMT)
Sulfur
Tensile Strength Ratio
Moisture Sensitivity
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