Remediated Thermal-Treated Soil and Tar-Containing Asphalt as Secondary Filler and Sand in Self-Compacting Concrete
Shizhe Zhang (TU Delft - Civil Engineering & Geosciences, Renewi Mineralz & Water)
Jeroen Lenderink (Renewi Mineralz & Water)
Marc Brito van Zijl (Renewi Mineralz & Water)
Vincent Twigt (Renewi Mineralz & Water)
Rob Bleijerveld (Renewi Mineralz & Water)
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Abstract
The shortage of high-quality fine aggregate as an essential component of concrete has become an emerging worldwide concern for the construction industry. Concrete typically comprises up to 30% fine aggregate, which largely influence the strength and durability of the final product. Therefore, finding suitable substitutes for natural fine aggregate has become an important aspect of current concrete research. In this study, we investigated the suitability of using remediated thermal-treated soil and tar-containing asphalt as secondary raw materials in self-compacting concrete (SCC) mixture. The remediated materials were used as both (1) fine aggregate replacement to replace all the river sand, and (2) partial filler/supplementary cementitious material (SCM) replacement. The modified Andreasen and Andersen (A&A) particle packing model was used to determine the optimal replacement level. Based on the optimal mixture design, the impact of the replacement on the fresh and mechanical properties of SCC was evaluated. Additionally, the pozzolanic reactivity of the fine fraction (<125 µm) within the secondary sand was assessed and compared to that of limestone powder. Our findings confirm that using remediated thermal-treated soil and tar-containing asphalt can produce a more circular, sustainable SCC by replacing high-quality natural sand and limestone filler and reducing the environmental impact of conventional SCC. This study contributes to finding viable alternatives to natural fine aggregate and promotes the use of recycled materials in construction.