Sustainable Use of Recycled Asphalt Pavement in Soil Stabilization

سال انتشار: 1402
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 26

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شناسه ملی سند علمی:

JR_CEJ-9-9_016

تاریخ نمایه سازی: 2 اردیبهشت 1403

چکیده مقاله:

This study addresses unused recycled asphalt pavement (RAP) incorporated into sedimentary soil from the Guabirotuba Formation in Curitiba, Southern Brazil. Different percentages of RAP, ranging from ۰% to ۸۰% by weight, were mixed with the pure soil, with and without the addition of pozzolanic Portland cement. Tests were conducted to evaluate the mixtures' compaction properties, mechanical strength, and expansion after curing for up to ۲۸ days. The results showed that adding RAP improved the mixtures' unconfined compressive strength (qu) and splitting tensile strength (qt). Up to ۶۰% RAP, the qu increased by ۲۶۰ kPa, and the qt increased by ۳۴۰ kPa compared to the pure soil. The California Bearing Ratio (CBR) tests demonstrated an ۱۸.۶۲% improvement when ۸۰% RAP was added to the untreated soil. In addition, the RAP also reduced the expansion of the compacted blends, with values decreasing from ۱.۱۹% to ۰.۸۸% with ۸۰% RAP replacement. The expansion value was further reduced to ۰.۸۶% when the cement was added. The cement-soil-RAP compacted blends showed suitability for subgrade reinforcement, meeting the criteria of expansion <۱% and CBR> ۲%. Additionally, ۳% cement and ۴۰% RAP mixtures were suitable as a sub-base layer, with expansion <۱% and CBR > ۲۰%. The results provide valuable insights into utilizing RAP as an alternative material in soil improvement techniques employing the novelty porosity-to-cement index. Doi: ۱۰.۲۸۹۹۱/CEJ-۲۰۲۳-۰۹-۰۹-۰۱۶ Full Text: PDF

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