Information from the abstract
ABSTRACT This study develops sustainable, ambient-cured lightweight alkali-activated concrete by upcycling recycled expanded polystyrene (EPS) foam and fully replacing freshwater with raw seawater. An FA-OPC blended precursor was activated using 5 M and 10 M seawater-based NaOH solutions. A counter-intuitive microstructural mechanism was discovered: the 5 M seawater activator outperformed the conventional 10 M baseline. The lower alkalinity prevented the quick setting typically induced by seawater ions, allowing for a controlled, dense gel network. The optimum mixture (0.80% EPS, 5 M NaOH) achieved a 28-day structural-grade compressive strength of 26.8 MPa and a low unit weight of 1,498 kg/m³. Furthermore, the cellular EPS inclusions effectively reduced thermal conductivity to 0.718 W/m·K and improved acoustic damping, reaching a peak sound absorption coefficient of 0.358 at 500 Hz. These findings present a highly viable, zero-freshwater approach for manufacturing functional, load-bearing lightweight concrete blocks.
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Related topics: Innovative concrete reinforcement materials · Concrete and Cement Materials Research · Innovations in Concrete and Construction Materials
Thai researcher and institutional participation
Prach Amornpinyo · Attaphol Bubpi · Yongyuth Sirisripetch · Preechawut Srirueng · Sumrerng Rukzon · Phongphan Tankasem · Patcharapol Posi · Prinya Chindaprasirt · Rajamangala University of Technology Isan · Khon Kaen University · Rajamangala University of Technology Rattanakosin · Mahasarakham University · The Royal College Of Anesthesiologists Of Thailand
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