Effect of Waste-Based Geopolymers on Asphalt Binder Performance

Author's Department

Construction Engineering Department

Second Author's Department

Construction Engineering Department

Third Author's Department

Construction Engineering Department

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https://doi.org/10.1007/978-3-031-61511-5_21

All Authors

Amani Saleh, Maram Saudy, Mohamed AbouZeid

Document Type

Research Article

Publication Title

Lecture Notes in Civil Engineering

Publication Date

1-1-2024

doi

10.1007/978-3-031-61511-5_21

Abstract

Asphalt cement is one of the most used road pavement materials due to its high road user satisfaction in terms of safety and comfortability. However, it possesses certain limitations such as its high carbon footprint and extensive maintenance costs over its lifetime, and hence, it negatively contributes to the environment and increases operational expenses. The aim of this work is to study the effect of incorporating waste-based geopolymers in asphalt binders on rheological properties based on multiple parameters including geopolymer composition, geopolymer percentage, and curing time. Two geopolymer mixes were prepared and comprised of combining raw materials fly ash (FA), metakaolin (MK), and silica fume (SF) with an alkali activator. The asphalt binder was modified with the geopolymer mixes by replacing the binder with 4, 8, and 12% geopolymer by weight of the binder. The modified binder was tested at different time intervals to investigate if the curing time of geopolymers inside the binder will improve the performance of the binder. Testing of the modified binder was conducted according to the Superpave testing procedures. The geopolymer-modified binder was examined under the dynamic shear rheometer, rotational viscometer, and bending beam rheometer machines. It is observed that the modification of the binder with geopolymers showed an increased performance with time. The FA as well as the MK-SF geopolymer-modified binders showed enhanced performance with respect to the virgin binder. Results showed that the binder sample modified with 12% FA geopolymer had a 31% improvement in high-temperature performance compared with the virgin binder and an 8.5% increase compared to the MK-SF geopolymer-modified binder. Both FA and MK-SF geopolymers had significant improvements in the low-performance grade with a 27% enhancement in performance compared to the virgin binder. Viscosity levels increased when modified with the geopolymer. This work provides an alternative to reduce asphalt binder in pavements which may consequently reduce carbon emissions and minimize landfill waste while enhancing the performance of the binder.

First Page

253

Last Page

267

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Conference Paper. Record derived from SCOPUS.

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