Fiber-Reinforced Lightweight Calcium Aluminate Cement-Based Concrete: Effect of Exposure to Elevated Temperatures

Özlem Salli Bideci, Hakan Yılmaz, Osman Gencel (), Alper Bideci, Bekir Çomak, Mehrab Nodehi and Togay Ozbakkaloglu ()
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Özlem Salli Bideci: Department of Architecture, Faculty of Art, Design and Architecture, Düzce University, 81600 Düzce, Turkey
Hakan Yılmaz: Institute of Science, Düzce University, 81600 Düzce, Turkey
Osman Gencel: Department of Civil Engineering, Faculty of Engineering, Bartin University, 74100 Bartin, Turkey
Alper Bideci: Department of Architecture, Faculty of Art, Design and Architecture, Düzce University, 81600 Düzce, Turkey
Bekir Çomak: Department of Civil Engineering, Faculty of Technology, Düzce University, 81600 Düzce, Turkey
Mehrab Nodehi: Department of Civil Engineering, University of California, Davis, CA 95616, USA
Togay Ozbakkaloglu: Ingram School of Engineering, Texas State University, San Marcos, TX 78666, USA

Sustainability, 2023, vol. 15, issue 6, 1-16

Abstract: Calcium aluminate cements (CACs) are a group of rapid-hardening hydraulic binders with a higher aluminum composition and lower ecological footprint compared to their ordinary Portland cement (CEM) counterparts. CACs are commonly known to have higher thermo-durability properties but have previously been observed to experience a major strength loss over time when exposed to thermal and humidity conditions due to the chemical conversion of their natural hydrated products. To address this, in this study, silica fume is added to induce a different hydration phase path suggested by previous studies and utilized in conjunction with fiber-reinforced lightweight pumice to produce lightweight concrete. To closely evaluate the performance of the produced samples with CAC compared to CEM, two different types of cement (CEM and CAC) with different proportions of pumice and crushed stone aggregate at temperatures between 200 and 1000 °C were tested. In this context, sieve analysis, bulk density, flowability, compressive and flexural strength, ultrasonic pulse velocity and weight loss of the different mixes were determined. The results of this study point to the better mechanical properties of CAC samples produced with pumice aggregates (compared to crushed stone) when samples are exposed to high temperatures. As a result, it is found that CACs perform better than CEM samples with lightweight pumice at elevated temperatures, showing the suitability of producing lightweight thermal-resistant CAC-based concretes.

Keywords: calcium aluminate cement (CAC); lightweight concrete; pumice; thermal performance; silica fume (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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