scholarly journals Shear and flexure behavior of hybrid composite beams with high performance concretes

2021 ◽  
Author(s):  
Md. Saiful Hasib
Keyword(s):  
High Performance ◽  
Composite Beams ◽  
Absorption Capacity ◽  
Energy Absorption Capacity ◽  
Self Consolidating Concrete ◽  
Flexural Performance ◽  
Design Specifications ◽  
Reinforced Composite ◽  
Fiber Bridging ◽  
Cracking Characteristics

Shear and flexure performances of composite beams with different engineered cementitious composites (ECC) to self-consolidating concrete (SCC) depth ratio were investigated. Shear reinforced composite ECC/SCC beams showed similar behavior compared to their non-shear reinforced counterparts until the formation of diagonal cracks but exhibited higher ultimate shear resistance and ductility. Compared to the full depth SCC and full depth ECC beams, non-shear reinforced composite ECC/SCC beams showed higher ductility and energy absorption capacity. Composite ECC/SCC beams showed higher number of cracks with lower crack width because of fiber bridging and micro-cracking characteristics of ECC. Code based equations and other design specifications were conservative in predicting shear strength of shear/non-shear reinforced composite ECC/SCC beams. Composite ECC/SCC flexure beams showed satisfactory flexural performance compared to their full depth ECC and SCC counterparts.

scholarly journals Shear and flexure behavior of hybrid composite beams with high performance concretes

2021 ◽  
Author(s):  
Md. Saiful Hasib
Keyword(s):  
High Performance ◽  
Composite Beams ◽  
Absorption Capacity ◽  
Energy Absorption Capacity ◽  
Self Consolidating Concrete ◽  
Flexural Performance ◽  
Design Specifications ◽  
Reinforced Composite ◽  
Fiber Bridging ◽  
Cracking Characteristics

Shear and flexure performances of composite beams with different engineered cementitious composites (ECC) to self-consolidating concrete (SCC) depth ratio were investigated. Shear reinforced composite ECC/SCC beams showed similar behavior compared to their non-shear reinforced counterparts until the formation of diagonal cracks but exhibited higher ultimate shear resistance and ductility. Compared to the full depth SCC and full depth ECC beams, non-shear reinforced composite ECC/SCC beams showed higher ductility and energy absorption capacity. Composite ECC/SCC beams showed higher number of cracks with lower crack width because of fiber bridging and micro-cracking characteristics of ECC. Code based equations and other design specifications were conservative in predicting shear strength of shear/non-shear reinforced composite ECC/SCC beams. Composite ECC/SCC flexure beams showed satisfactory flexural performance compared to their full depth ECC and SCC counterparts.

scholarly journals Structural performance of link slabs subjected to monotonic and fatigue loading incorporating engineered cementitious composites

2021 ◽  
Author(s):  
Shirin Ghatreh Samani
Keyword(s):  
Fatigue Loading ◽  
Absorption Capacity ◽  
Superior Performance ◽  
Structural Performance ◽  
Test Results ◽  
Energy Absorption Capacity ◽  
Self Consolidating Concrete ◽  
Design Specifications ◽  
Ductility Index ◽  
Energy Absorbing

This research presents the results of experimental investigation conducted on 1/4th scale link slabs subjected to monotonic and fatigue loading incorporating different ECC mixtures and self-consolidating concrete (SCC). The structural performance for the link slabs are evaluated based on the load-deformation/moment-rotation responses, strain developments, cracking patterns, ductility index and energy absorption capacity. Test results of a 1/6th scale full bridge with ECC link slab tested under monotonic loading up to service stage is also described. The experimental link slab moment resistance and its length are compared with those obtained from theoretical and design specifications. The ECC link slabs demonstrated superior performance exhibiting high residual strength and energy absorbing capacity and prolonged life (associated with enduring large number of fatigue cycles) compared to their SCC even though subjected to higher fatigue stress levels. This research confirmed the viability of ECC link slab to construct joint-free bridges satisfying serviceability and design specifications.

scholarly journals Structural performance of link slabs subjected to monotonic and fatigue loading incorporating engineered cementitious composites

2021 ◽  
Author(s):  
Shirin Ghatreh Samani
Keyword(s):  
Fatigue Loading ◽  
Absorption Capacity ◽  
Superior Performance ◽  
Structural Performance ◽  
Test Results ◽  
Energy Absorption Capacity ◽  
Self Consolidating Concrete ◽  
Design Specifications ◽  
Ductility Index ◽  
Energy Absorbing

This research presents the results of experimental investigation conducted on 1/4th scale link slabs subjected to monotonic and fatigue loading incorporating different ECC mixtures and self-consolidating concrete (SCC). The structural performance for the link slabs are evaluated based on the load-deformation/moment-rotation responses, strain developments, cracking patterns, ductility index and energy absorption capacity. Test results of a 1/6th scale full bridge with ECC link slab tested under monotonic loading up to service stage is also described. The experimental link slab moment resistance and its length are compared with those obtained from theoretical and design specifications. The ECC link slabs demonstrated superior performance exhibiting high residual strength and energy absorbing capacity and prolonged life (associated with enduring large number of fatigue cycles) compared to their SCC even though subjected to higher fatigue stress levels. This research confirmed the viability of ECC link slab to construct joint-free bridges satisfying serviceability and design specifications.

scholarly journals A preliminary study on the development of the normal concrete-UHPC composite beam via wet casting

2021 ◽  
Vol 4 (1) ◽  
pp. 46-56
Author(s):  
Çağlar Yalçınkaya
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Composite Beams ◽  
Absorption Capacity ◽  
Rc Beams ◽  
Tension Zone ◽  
Structural Elements ◽  
Normal Concrete ◽  
Preliminary Study

Ultra-high-performance concrete (UHPC) is an innovative cementitious composite containing steel fiber reinforcement that can improve the behavior of structural elements thanks to its high strength and improved ductility properties. The mix design that provides these superior properties of UHPC also makes it a high-cost material. For this reason, the use of UHPC in parts where it contributes more significantly to the performance of the structural elements will lower down the costs and reduce the negative environmental effects caused by high cement content. In this preliminary study, the production of normal concrete (NC)-UHPC reinforced concrete (RC) composite beams by wet-on-wet casting was investigated by producing mini-RC beams. In the production of mini-RC beams, normal mortar (NM) and self-compacting mortar (SCM) mixtures were used to represent an NC. The results showed that in the production of NC-UHPC composite beams, the mixtures should have different rheological properties depending on the order of the layers. Increasing the total thickness of the UHPC layer enhanced the initial and yield stiffnesses as well as the peak loads. UHPC layer with thicknesses of 15 mm in tension zone, 30 mm in tension zone, and 15+15 mm in tension+compression zone led to the load-carrying capacity increment ratios of 20%, 34.6%, and 24.3%, respectively. However, increasing the thickness of the UHPC layer in the composite beams, especially more than 15 mm, reduced the ductility ratio and energy absorption capacity. Optimizing the tensile reinforcement ratio in UHPC layers can overcome the drawbacks in the ductility.

scholarly journals Study of Flexural Behaviour of Warp Knitted Reinforced Ferrocement Composites

2019 ◽  
Vol 27 (4(136)) ◽  
pp. 94-101
Author(s):  
S. Paramasivam ◽  
M. Rameshkumar ◽  
R. Malathy ◽  
C. Prakash
Keyword(s):  
High Performance ◽  
Ultimate Load ◽  
Steel Wire ◽  
Absorption Capacity ◽  
Wire Mesh ◽  
Flexural Properties ◽  
Energy Absorption Capacity ◽  
Knit Fabrics ◽  
Steel Wire Mesh ◽  
Mesh Structures

This paper presents the effect of warp knit textile reinforcement in ferrocement laminates. In general, steel wire mesh is used as ferrocement reinforcement, which is often known as chicken mesh. The need for the replacement of steel mesh is the problem of corrosion, which reduces the durability of ferrocement laminate. High performance synthetic fibres and fabrics are constantly used in various research works as reinforcement in concrete. In this paper, an attempt was made to incorporate three different nylon warp knit mesh structures in the place of chicken mesh. Ferrocement composites were produced with chicken mesh and nylon warp knit fabrics. The flexural properties of ferrocement laminates were analysed in terms of the first crack load, ultimate load, energy absorption capacity and ductility factor. Nylon square mesh with 3 layers in the reinforcement has a 2.5 kN first crack load and 3.36 kN ultimate load, which is higher than chicken mesh reinforcement in ferrocement laminate. The results show that there is an improvement in the flexural properties of ferrocement laminates reinforced with a nylon warp knit structure. The flexural parameters have a direct relationship with the number of layers used in the reinforcement.

scholarly journals Shear And Flexural Behaviour Of Fiber Reinforced Lightweight Self-Consolidating Concrete Beams

2021 ◽  
Author(s):  
Ali Rashidian ◽  
Khandaker M. Anwar
Keyword(s):  
Energy Absorption ◽  
Failure Modes ◽  
Crumb Rubber ◽  
Absorption Capacity ◽  
Fiber Reinforced ◽  
Flexural Behaviour ◽  
Energy Absorption Capacity ◽  
Self Consolidating Concrete ◽  
Poly Ethylene ◽  
Energy Absorbing

This research studied the shear and flexural behaviour of fiber reinforced lightweight self-consolidating concrete (FRLWSCC) beams made of three different fibers such as: High-Density Poly Ethylene (HDPE), Crumb Rubber (CR) and Polyvinyl Alcohol (PVA) compared with lightweight self-consolidating concrete (LWSCC) beams. The performances of all beams were described based on load-deformation or moment-rotation response, strain developments, crack characterization, failure modes, ductility, stiffness and energy absorbing capacity. All FRLWSCC shear beams showed higher ultimate shear resistance, ductility and energy absorption capacity compared to LWSCC beams. All FRLWSCC flexural beams at failure exhibited higher flexural capacity, more cracks with smaller width, higher ductility, higher energy absorption capacity and lower stiffness compared to their LWSCC counterparts. FRLWSCC beams especially made of HDPE fibers showed better shear and flexural capacities besides satisfactory ductility performance. Experimental shear and flexural capacities of FRLWSCC beams were compared with those predicted from Code based and other existing equations.

Influence of Hybrid Steel Fiber Addition on Direct Tensile Behavior of UHPC

2016 ◽  
Vol 713 ◽  
pp. 270-272
Author(s):  
Seung Hun Park ◽  
Kyung Taek Koh ◽  
Gum Sung Ryu ◽  
Gi Hong An ◽  
Nam Kon Lee
Keyword(s):  
High Performance ◽  
Steel Fiber ◽  
Absorption Capacity ◽  
Tensile Behavior ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Energy Absorption Capacity ◽  
High Performance Fiber ◽  
Direct Tensile ◽  
Direct Tensile Test

This paper examines the direct tensile behavior of ultra high performance fiber reinforced concrete (UHPFRC) according to the addition of hybrid-type steel fibers with different lengths and diameters but identical aspect ratio. Two types of steel fibers that are MS fiber with length of 20 mm and diameter of 0.2 mm and LS fiber with length of 22 mm and diameter of 0.22 mm are adopted and admixed together with different proportions to give three series of mixes (MS10LS05, MS075LS075, MS05LS10). Direct tensile test is conducted on specimens using each of the considered mixes and notched on both sides. The results show that the tensile strength and the energy absorption capacity of UHPFRC tend to increase with larger proportions of relatively long steel fibers.

Effects of Inclination Angle on Pullout Performance of Hooked End Fiber Embedded in UHPC

2019 ◽  
Vol 812 ◽  
pp. 60-65
Author(s):  
Y.Y.Y. Cao ◽  
Q.L. Yu ◽  
H.J.H. Brouwers
Keyword(s):  
Mechanical Strength ◽  
Inclination Angle ◽  
High Performance ◽  
High Performance Concrete ◽  
Absorption Capacity ◽  
Fiber Reinforced Concrete ◽  
Ultra High Performance Concrete ◽  
Energy Absorption Capacity ◽  
High Performance Fiber ◽  
Inclination Angles

Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) is a material with superior mechanical strength and energy absorption capacity. The orientation of the fiber and the fiber-matrix bond relationship are important factors that affect the performance of UHPFRC. In this study, the pullout performances of hooked end fibers embedded in ultra-high performance concrete (UHPC) matrix under various inclination angles are investigated. It is shown that for the tested fiber and UHPC matrix, the optimum angle for reaching the maximum pullout energy is around 10 degrees; when the inclination angle further increases fiber rupture and matrix spalling occur more frequently. Results from this study can contribute to a better understanding and utilization of fibers effects in UHPFRC.

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