Anchorage Effects of Various Steel Fibre Architectures for Concrete Reinforcement

Abstract

This paper studies the effects of steel fibre geometry and architecture on the cracking behaviour of steel fibre reinforced concrete (SFRC), with the reinforcements being four types, namely 5DH (Dramix Ò hooked-end), 4DH, 3DH-60 and 3DH-35, of various hooked-end steel fibres at the fibre dosage of 40 and 80 kg/m 3 . The test results show that the addition of steel fibres have little effect on the workability and compressive strength of SFRC, but the ultimate tensile loads, post-cracking behaviour, residual strength and the fracture energy of SFRC are closely related to the shapes of fibres which all increased with increasing fibre content. Results also revealed that the residual tensile strength is significantly influenced by the anchorage strength rather than the number of the fibres counted on the fracture surface. The 5DH steel fibre reinforced concretes have behaved in a manner of multiple crackings and more ductile compared to 3DH and 4DH ones, and the end-hooks of 4DH and 5DH fibres partially deformed in steel fibre reinforced self-compacting concrete (SFR-SCC). In practice, 5DH fibres should be used for reinforcing high or ultra-high performance matrixes to fully utilize their high mechanical anchorage.

Effect of Fiber Hybridization on Durability Related Properties of Ultra-High Performance Concrete

“…Workability can be ensured by applying large amounts of superplasticizer (2009). Fibers are added to the matrix as reinforcement to control cracking and to increase material ductility (Dinh et al 2016;Abdallah et al 2016;Bencardino et al 2010;Abou El-Mal et al 2015;Sorensen et al 2014). The cracks in concrete generally occur over time due to a number of reasons.…”

Çelik lif kanca geometrisinin yüksek dayanımlı lifli betonların statik ve darbe yükleri altında eğilme özelliklerine etkisi

“…Abdallah vd. [33] tarafından da 4D ve 5D tipi çelik liflerin betonun çökme değerini 3D liflere kıyasla önemli oranda etkilemese de betonun işlenebilirliğini azalttığını rapor etmiştir. Betona eklenen çelik lif hacmi arttıkça beklendiği gibi, betonun Şekil 2.…”

A Statistical Study to Investigate the Efficiency of Steel and Polypropylene Fiber in Enhancing the Durability Properties of Concrete Composites

“…fiber reinforced concrete (FRC), in which cement-based matrix, is reinforced with the orderly or arbitrary distribution of fibers [1][2][3][4][5]. The fibers help to distribute the loads at the internal micro-cracks, thus producing materials with increased tensile strength, ductility, toughness and improved durability properties [6][7][8][9][10]. There is a wide range of fibers available to improve toughness and different properties of hardened concrete.…”