Investigating the durability enhancement of recycled construction concrete through the application of nano-montmorillonite
This study investigates the durability enhancement of recycled concrete aggregates (RCA) through the application of nano-montmorillonite (NMT), aiming to address their inferior durability compared to natural aggregates. Utilizing RCA sourced from demolished structures aged 10–30 years and NMT with a...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-04-01
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| Series: | Alexandria Engineering Journal |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1110016825001504 |
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| Summary: | This study investigates the durability enhancement of recycled concrete aggregates (RCA) through the application of nano-montmorillonite (NMT), aiming to address their inferior durability compared to natural aggregates. Utilizing RCA sourced from demolished structures aged 10–30 years and NMT with a particle size of 70–100 nm, five concrete mix proportions were prepared, including a control mix with 100 % natural aggregates and four mixes with 60 % RCA replacement, varying in NMT content (1 %, 3 %, 5 % by weight). The optimal NMT dosage was identified as 3 %, where it significantly improved durability indicators. At this dosage, the 28-day compressive strength of RCA concrete was only 3–4 % lower than the control mix, and at 90 days, it matched or exceeded the control by 1–2 %. Carbonation depth reduced by 49 %, drying shrinkage by 46 %, and chloride ion ingress showed over 51 % reduction compared to the RCA mix without NMT. Electrical resistivity improved by 63 %, underscoring NMT's effectiveness in enhancing RCA concrete's durability, crucial for sustainable construction practices. |
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| ISSN: | 1110-0168 |