Alkaline activated concrete with recycled asphalt pavement aggregate
DOI:
https://doi.org/10.3989/mc.2026.393224Keywords:
Geopolymer Concrete, recycled asphalt pavement aggregates, Dolomite, Fly Ash, Microstructure analysisAbstract
Geopolymer concrete is an eco-friendly alternative to cement concrete that reduces carbon emissions through the utilisation of industrial waste. This study enhances its sustainability by incorporating recycled asphalt pavement (RAP) aggregates as partial replacements for natural coarse aggregate at 0%, 20%, 40%, 60%, 80%, and 100%, using fly ash and dolomite as binders. The analysis revealed improvements within a specific RAP threshold, with 40% identified as the optimum proportion. Strong correlations (R2 > 0.90) were observed among compressive, flexural, split tensile strength and ultrasonic pulse velocity at 28 and 56 days. SEM-EDS analyses indicated a denser matrix, while XRD and FTIR confirmed the formation of C(N)–A–S–H type gels. These findings demonstrate the potential of RAP in geopolymer concrete, promoting sustainable construction through efficient material reuse.
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