Enhancing the crumb rubber modified asphalt’s storage stability through the control of its internal network structure

Ragab, Mohyeldin; Abdelrahman, Magdy

doi:10.1016/j.ijprt.2017.08.003

Cited by 37 publications

(16 citation statements)

References 18 publications

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“…The interrupted shear flow test was applied for all asphalt-rubber-guayule liquid phases. Previous researchers studied the formation of a 3D network structure [19,29,36,37]. Those references [19,29,36,37] declared the 3D network structure formation indicates higher performance of the binder than that of no apparent 3D network structure formation.…”

Section: Dynamic Shear Rheometer (Dsr)mentioning

confidence: 99%

“…Previous researchers studied the formation of a 3D network structure [19,29,36,37]. Those references [19,29,36,37] declared the 3D network structure formation indicates higher performance of the binder than that of no apparent 3D network structure formation. Regarding the rheological analysis limitations, this was evident by the creation of a peak overshoot of shear stress with the application kickoff; hence, steady-state shear flow with time was clarified by Ragab et al (2013), and Ragab and Abdelrahman (2018) [19,29].…”

Section: Dynamic Shear Rheometer (Dsr)mentioning

confidence: 99%

“…Those references [19,29,36,37] declared the 3D network structure formation indicates higher performance of the binder than that of no apparent 3D network structure formation. Regarding the rheological analysis limitations, this was evident by the creation of a peak overshoot of shear stress with the application kickoff; hence, steady-state shear flow with time was clarified by Ragab et al (2013), and Ragab and Abdelrahman (2018) [19,29]. In this research, this test was started at a temperature of 64 • C after a waiting time of 30 min and was attributed to a shear rate of 2 s-1 [19,29,36,37], under the strain control regime [36,37].…”

Section: Dynamic Shear Rheometer (Dsr)mentioning

confidence: 99%

“…Regarding the rheological analysis limitations, this was evident by the creation of a peak overshoot of shear stress with the application kickoff; hence, steady-state shear flow with time was clarified by Ragab et al (2013), and Ragab and Abdelrahman (2018) [19,29]. In this research, this test was started at a temperature of 64 • C after a waiting time of 30 min and was attributed to a shear rate of 2 s-1 [19,29,36,37], under the strain control regime [36,37]. The initial stress growth was applied for 60 s and then applied again (second stress growth) for the same duration [36] after the rest time to follow its development and trend up to recovery.…”

Section: Dynamic Shear Rheometer (Dsr)mentioning

confidence: 99%

“…Since this test might not have been entirely representative regarding the guayule resin solubility in asphalt and an issue might still be there regarding the asphalt-guayule compatibility, the separation tendency test, according to ASTM D7173 [28], was implemented for the same asphalt-guayule blend. This test aimed to investigate the asphalt-guayule phase separation as interpreted by the separation index (SI) in Equation 1, [29].…”

mentioning

confidence: 99%

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Influence of Guayule Resin as a Bio-Based Additive on Asphalt–Rubber Binder at Elevated Temperatures

Hemida

Abdelrahman

2019

Recycling

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This study seeks to find the influence of replacing a portion of the asphalt–rubber binder with the bio-based material “guayule resin.” This replacement could be beneficial in terms of sustainability, economics, and environmental concerns related to the asphalt industry. Nine asphalt–rubber–guayule binders were investigated to find their rheological properties. Consecutively, the study proceeded with five selected binders being compared to the original asphalt (PG64-22). Investigations underwent whole matrices (crumb rubber modifier (CRM) residue included) and liquid phases (CRM residue extracted). Additionally, these properties were partially sought for their corresponding asphalt–rubber binders to compare and judge the contribution of the guayule resin. Likewise, a thermo-gravimetric analysis was done for the guayule resin to recognize its moisture and composition complexity. Such an analysis was also done for the as-received CRM and some extracted CRMs to determine the release and residue of rubber components. Outcomes showed that the guayule resin has the potential to compensate the performance required against the original asphalt at elevated temperatures while greatly decreasing the asphalt cement proportion. For instance, a blend of 62.5% asphalt, 12.5% CRM, and 25% guayule resin provided better performance than that of the original asphalt.

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