High strength blended cement concrete incorporating volcanic ash: Performance at high temperatures |
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| Affiliation: | 1. University of Cergy-Pontoise, Laboratoire de Mécanique & Matériaux du Génie Civil, EA 4114, F-95000 Cergy-Pontoise, France;2. Queen’s University, Department of Civil Engineering, 58 University Ave., Kingston, ON, Canada;3. University of Cergy-Pontoise, Laboratoire de Géosciences & Environnement, EA 4506, F-95000 Cergy-Pontoise, France;1. School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China;2. School of Mechanics and Engineering Science, Zhengzhou University, Zhengzhou 450001, China;1. Civil Engineering, College of Engineering, Jazan University, 45142 Jazan, Saudi Arabia;2. Civil Engineering Department, Islamic University of Gaza, Gaza, Palestine;3. Department of Civil Engineering, College of Engineering, University of Hafr Al Batin, 31991 Hafr Al Batin, Saudi Arabia;1. Division of Engineering, New York University Abu Dhabi, Abu Dhabi, P.O. Box 129188, United Arab Emirates;2. Department of Construction Management, University of North Florida, 1 UNF Dr., Jacksonville, FL 32224, USA;3. Department of Civil and Environmental Engineering, Seoul National University, Seoul 08826, South Korea |
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| Abstract: | The strength and durability of high strength blended cement concretes incorporating up to 20% of volcanic ash (VA) subjected to high temperatures up to 800 °C are described. The strength was assessed by unstressed residual compressive strength, while durability was investigated by rapid chloride permeability (RCP), mercury intrusion porosimetry (MIP), differential scanning calorimetry (DSC), crack pattern observations and microhardness testing. High strength volcanic ash concrete (HSVAC) exhibited better performance showing higher residual strength, chloride resistance and resistance against deterioration at high temperatures compared to the control high strength OPC concrete. However, deterioration of both strength and durability of HSVACs increased with the increase of temperature up to 800 °C due to weakened interfacial transition zone (ITZ) between hardened cement paste (hcp) and aggregate and concurrent coarsening of the hcp pore structure. The serviceability assessment of HSVACs after a fire should therefore, be based on both strength and durability considerations. |
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