Properties of Fiber-Reinforced Alkali-Activated Concrete (FRAAC)
Arkamitra Kar (Birla Institute of Technology and Science, Pilani)
Pujitha Ganapathi Chottemada (Birla Institute of Technology and Science, Pilani)
Lucija Hanžič (Zavod za gradbeništvo Slovenije)
Sri Kalyana Rama Jyosyula (Mahindra University)
Patricia Kara De Maeijer (Universiteit Antwerpen)
Behzad Nematollahi (University of Sheffield)
Kruthi Kiran Ramagiri (Indian Institute of Technology Hyderabad)
Laura Rossi (Karlsruhe Institut für Technologie)
Aljoša Šajna (Zavod za gradbeništvo Slovenije)
Shizhe Zhang (TU Delft - Materials and Environment)
Mingzhong Zhang (University College London)
Guang Ye (TU Delft - Materials and Environment)
Frank Dehn (Karlsruhe Institut für Technologie)
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Abstract
The use of fibers to address tensile cracking in alkali-activated concrete (AAC) is a topic of ongoing research. The addition of fibers enhances the tensile and flexural characteristics of all types of concrete including AAC. However, the mixing process, the setting time, and the workability are compromised due to the presence of fibers in the hardened matrix. There are different material categories of fibers such as steel, synthetic, carbon, and organic fibers that can impart different characteristics depending on the intended usage of concrete. The present chapter reviews the different types, orientations, dosages, and geometric properties of fibers included in AAC. along with the effects of fiber addition on the mix design, mixing and curing procedure of concrete, as well as the fresh and hardened characteristics of fiber-reinforced alkali-activated concrete (FRAAC). The use of statistical models to predict the mechanical characteristics of FRAAC is also discussed. Finally, the chapter presents the advantages, disadvantages, and safety precautions for this material followed by recommendations for practical usage.