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INTRODUCTION??? HISTORICAL PERSPECTIVE??? Fibers have been used as reinforcement since ancient times.??? Historically, horsehair was used in mortar and straw in mud bricks.??? In the early 1900s, asbestos fibers were used in concrete.??? By the 1960s, steel, glass (GFRC), and synthetic fibers such as polypropylene fibers were used in concrete, and research into new fiber reinforced concretes conti
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