Effect of Nanomaterials on Cracking and Rutting Resistance of HMA

Gedafa, Daba S.; Karki, Bishal; Berg, A.; Saha, Rajan; Melaku, R. S.

doi:10.1061/9780784482476.010

Cited by 3 publications

(1 citation statement)

References 10 publications

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“…Specifically, modification of asphalt binders with nanoclays has been found to enhance the performance of the mix in various ways. For example, it can increase the dynamic shear complex modulus, reduce the strain failure rate, improve rutting resistance, reduce the penetration value, increase the softening point temperature and viscosity, and enhance the fatigue life of the asphalt mix [13][14][15][16][17][18][19][20][21][22][23][24]. Nanoclays can also improve the cohesion of the asphalt binder, thereby increasing the material's ability to heal micro-cracks [25].…”

Section: Introductionmentioning

confidence: 99%

Surface-Modified Nanoclays for Enhancing Resistance to Moisture Damage in Hot Mix Asphalt

Rahim,

Badawy,

Cox

2024

AJCE

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Previous research indicated that nanomaterials have potential in improving pavement properties, particularly moisture resistance. This study evaluated the effectiveness of nanoclays in enhancing the resistance of Hot Mix Asphalt (HMA) to moisture damage and compared its performance to standard modifiers. Asphalt binder modified using four additives was tested using a Dynamic Shear Rheometer (DSR) before and after being aged in a Rolling Thin Film Oven (RTFO): two surface-modified nanoclays and two liquid anti-stripping chemicals (HP+ and LOF 6500). The DSR and RTFO tests showed that the two nanoclays had a stiffening effect on the binder, while both liquid antistripping agents had the opposite effect, decreasing both the elastic and complex modulus of the binder. After RTFO aging, similar trends were observed, except the binder had become much stiffer in all cases. HMA designed employing the Superpave mix design procedure was tested for moisture sensitivity in accordance with AASHTO T-283. The dry tensile strength for the two nanoclays and LOF 6500 modified mixes were higher than the control mix. However, all modified mixes resulted in wet tensile strengths that were higher than the control. The tensile strength ratios for all modified mixes were also higher than the control and exceeded the Superpave mix design method minimum of 0.80. Evaluation of these additives in the field would further benefit asphalt pavement research.

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