Naduhatty Selai Raman

Improved Storage Stability of Crumb Rubber Modified Bitumen using Long Chain Amines

With increased transportation, waste tire rubber accumulation becomes a major environmental concern. The use of crumb rubber, recycled tire rubber is considered as an additive in bitumen modification for road pavement and economic disposal or tire rubber. Although, crumb rubber modified bitumen shows excellent performance properties due to its elastic nature but meanwhile storage stability of crumb rubber modified bitumen (CRMB) is still an issue due to poor dispersion of crumb rubber particle in bitumen, which affects the performance of road pavement. Keeping these issues in mind, we have doped various long chain amines in CRMB to improve its storage stability and physical and rheological properties CRMB.

Synergic Effect of Diethylenetriamine (DETA) and Stearic Acid on Improved Storage Stability of Crumb Rubber Modified Bitumen

Crumb rubber is most commonly used for bitumen modification due to its elastic nature. However, crumb rubber modified bitumen has storage stability issue at high temperature. Thus, this study focused on improvement of storage stability of the crumb rubber modified bitumen (CRMB) using seven different ratios of DETA and stearic acid, i.e. 1:0, 0:1, 1:1, 1:2, 1:3, 2:1 and 3:1 to visualize the synergic effect in combination. We have found that storage stability of CRMB was enhanced synergically using 1:1 ratio of DETA and stearic acid in CRMB (separation value decreased from 8 to 2.4 °C) with improved rheological and performance properties as compare to conventional CRMB. With that we have also found that high temperature rutting resistance (G*/Sinδ) has increased from 0.75 to 1.19 kPa for unaged binder and 1.45 to 2.35 kPa for aged binder at 82 °C. Meanwhile, the low temperature creep rate (m-value) has increased from 0.28 to