A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Role of Graphene Oxide Nanosheet on Mixing and Compacting Temperature of Bitumen
Durability of flexible pavements is a major concern. The durability is greatly influenced by construction practice wherein properly compacted mixes have longer life. The mixing and compaction temperature which ultimately depends upon viscosity of bitumen affects durability. In order to achieve proper bitumen-aggregate mixing, the bitumen should attain a viscosity range beyond which the bitumen would be sufficiently thick to properly coat the aggregates and below which the bitumen flows. On construction site, laying and proper compacting is achieved only when the bitumen remains within certain viscosity range. Below this range, the rolling process leads to lateral movement of the mix and above which the mix becomes too stiff for proper compaction to achieve requisite density. Viscosity is determined using the equiviscous temperature method wherein kinematic viscosities are obtained at varying temperatures using rotational viscometer (RV) and a viscosity-temperature graph is plotted. Temperature range corresponding to 0.17 ± 0.02 Pa.s is chosen as mixing temperature and 0.28 ± 0.03 Pa.s is chosen as compacting temperature respectively. Achievement of significant improvements in the rheological properties by the use of nano sized particles has motivated for identification and usage of new nano materials in the field. Recent usage and encouraging result using Graphene Oxide (GO) nanosheet had served as the motivation for its usage in the present study. GO was synthesized using modified Hummers’ method and Fourier Transformation infrared (FTIR), UV-Vis and X-ray diffraction was done to characterize the synthesized GO. High speed stirrer was used to produce the GO modified binder at 0.2%, 0.5% and 1% GO by weight of binder and compared with virgin binder. RV was thereafter used to obtain viscosity-temperature graphs varying the temperature and mixing and compacting temperature was obtained using the equiviscous temperature method. It was observed that viscosity kept on decreasing with increase in GO concentration. This reduction of viscosity can be attributed to sheet structure of GO which internally mobilizes the binder. This result in significant reduction in mixing and compacting temperature renders environmental benefits. However, several other tests and evaluations are needed to justify the cost associated with the synthesis and use of this nanomaterial in flexible pavements.
Role of Graphene Oxide Nanosheet on Mixing and Compacting Temperature of Bitumen
Durability of flexible pavements is a major concern. The durability is greatly influenced by construction practice wherein properly compacted mixes have longer life. The mixing and compaction temperature which ultimately depends upon viscosity of bitumen affects durability. In order to achieve proper bitumen-aggregate mixing, the bitumen should attain a viscosity range beyond which the bitumen would be sufficiently thick to properly coat the aggregates and below which the bitumen flows. On construction site, laying and proper compacting is achieved only when the bitumen remains within certain viscosity range. Below this range, the rolling process leads to lateral movement of the mix and above which the mix becomes too stiff for proper compaction to achieve requisite density. Viscosity is determined using the equiviscous temperature method wherein kinematic viscosities are obtained at varying temperatures using rotational viscometer (RV) and a viscosity-temperature graph is plotted. Temperature range corresponding to 0.17 ± 0.02 Pa.s is chosen as mixing temperature and 0.28 ± 0.03 Pa.s is chosen as compacting temperature respectively. Achievement of significant improvements in the rheological properties by the use of nano sized particles has motivated for identification and usage of new nano materials in the field. Recent usage and encouraging result using Graphene Oxide (GO) nanosheet had served as the motivation for its usage in the present study. GO was synthesized using modified Hummers’ method and Fourier Transformation infrared (FTIR), UV-Vis and X-ray diffraction was done to characterize the synthesized GO. High speed stirrer was used to produce the GO modified binder at 0.2%, 0.5% and 1% GO by weight of binder and compared with virgin binder. RV was thereafter used to obtain viscosity-temperature graphs varying the temperature and mixing and compacting temperature was obtained using the equiviscous temperature method. It was observed that viscosity kept on decreasing with increase in GO concentration. This reduction of viscosity can be attributed to sheet structure of GO which internally mobilizes the binder. This result in significant reduction in mixing and compacting temperature renders environmental benefits. However, several other tests and evaluations are needed to justify the cost associated with the synthesis and use of this nanomaterial in flexible pavements.
Role of Graphene Oxide Nanosheet on Mixing and Compacting Temperature of Bitumen
Sustain. Civil Infrastruct.
Steyn, Wynand JvdM (editor) / Wang, Zhixin (editor) / Holleran, Glynn (editor) / Chakravarty, Hillol (author) / Sinha, Sanjeev (author) / Kumar, Pramanand (author) / Das, Subrata (author)
Civil Infrastructures Confronting Severe Weathers and Climate Changes Conference ; 2021 ; NanChang, China
Transportation Infrastructure Engineering, Materials, Behavior and Performance ; Chapter: 7 ; 110-117
2021-07-11
8 pages
Article/Chapter (Book)
Electronic Resource
English
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