scholarly journals Structural Behavior Of Simple Supported Two Layers Reinforced Concrete (Normal strength concrete & Mortar with 3-Dimension glass fiber), Beams

2021 ◽  
Vol 28 (2) ◽  
pp. 93-106
Author(s):  
Zena Yasen ◽  
 Assim Lateef ◽  
Ammar Khazaal
Keyword(s):  
Reinforced Concrete ◽  
Glass Fibre ◽  
Concrete Beam ◽  
Load Capacity ◽  
Tension Zone ◽  
Normal Strength Concrete ◽  
Strength Concrete ◽  
Layered Beams ◽  
Beam Thickness ◽  
Normal Strength

This paper represents an experimental investigation of the layered concrete beam. It contains studying the possibility of using the mortar intervention with layers of glass fibre at the tension zone in a loaded supported concrete beam. To produce a beam with less weight than the beam with all Normal concrete and detecting the effect of this replacement on beam properties. A rectangular beams section (150*200*1000)mm cast with NSC (normal strength concrete) at compression zone and mortar with layers of 3D glass fibre used as a part of the tension zone. The produced beams are layered beams with a lighter weight than the homogenous RC beam. Three deferent levels of the replaced layers (1/3,1/2, and 2/3 of the beam thickness) were studied, all beams were tested under Two point load till failure. The maximum load capacity result shows an apparent lowering in the load capacity of the beam, but as the lightweight layer increases, this lowering in the load capacity becomes less. for (1/3,1/2 and 2/3) of the beam thickness replace with mortar and 3D textile fibre, the lowering percentage of failure load compare with the homogenous reinforced concrete beam are (33.04%, 27.18%, and 19.73%), and the lowering in weight is (5.45%%, 9.07%, and 12..92%) for the same sequence, respectively. Stiffness, ductility and toughness of all beams are tested. An apparent lowering in the stiffness value of the layered beams is recorded with the reference ones. At the same time, it shows an increase in the toughness and toughness value

Tensile basic creep versus compressive basic creep at early ages: comparison between normal strength concrete and a very high strength fibre reinforced concrete

2013 ◽  
Vol 47 (10) ◽  
pp. 1773-1785 ◽  
Author(s):  
Pierre Rossi ◽  
Jean Philippe Charron ◽  
Maléna Bastien-Masse ◽  
Jean-Louis Tailhan ◽  
Fabrice Le Maou ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
High Strength ◽  
Basic Creep ◽  
Fibre Reinforced Concrete ◽  
Normal Strength Concrete ◽  
Strength Concrete ◽  
Normal Strength ◽  
Very High

scholarly journals Strengthening of RC plates with mineral-bonded composite layers for enhanced impact safety

2020 ◽  
Vol 323 ◽  
pp. 01015
Author(s):  
Marcus Hering ◽  
Manfred Curbach
Keyword(s):  
Reinforced Concrete ◽  
Test Facility ◽  
Experimental Program ◽  
Normal Strength Concrete ◽  
Strength Concrete ◽  
Reinforcement Steel ◽  
Composite Layers ◽  
Bonded Composite ◽  
Normal Strength ◽  
Impact Experiments

The presented paper deals with a series of impact experiments conducted in the drop tower facility of the Otto Mohr Laboratory (OML) at the Technische Universität Dresden. The presented research results were generated in three projects. A number of reinforced concrete (RC) plates which were subsequently strengthened on the not-impacted side were produced and tested. As basic materials for the RC plates, a normal strength concrete (C35/45) and conventional BSt500 reinforcement steel were used. Different material combinations, cement-bonded composites were chosen for the subsequently applied strengthening layer. The paper presents the experimental program, the used test facility, and the results of the experiments and their interpretation.

scholarly journals Performance Enhancement of R.C. Beams with Large Web Openings by Using Reactive Powder Composite: An Experimental Study

2018 ◽  
Vol 21 (3) ◽  
pp. 405-416
Author(s):  
Nidaa Qassim Jassim ◽  
Husain Khalaf Jarallah
Keyword(s):  
Experimental Study ◽  
Shear Zone ◽  
Performance Enhancement ◽  
Powder Composite ◽  
Tension Zone ◽  
Compression Zone ◽  
Normal Strength Concrete ◽  
Strength Concrete ◽  
Normal Strength ◽  
Reactive Powder

In this paper an experimental works conducted to study the behavior of R.C. beam with large web opening at different locations and fortified with reactive powder composite (RPC) at the extreme tension zone (bottom edge of opening) and/or extreme compression zone (Top edge of opening). The experimental study is investigate the  behavior of twelve beams and study the ability of using normal strength concrete together with RPC in the same section to exploit the advantages of these two materials in optimal way. The main variables are RPC layers locations in tension zone and/or in compression zone and the locations of openings. The ultimate loads, load mid-span deflection behavior and strain for steel and concrete were discussed. The experimental results showed that the ultimate strength was decreased with increasing number of opening about 4% for beams with two openings located in shear zone and 21% for beams with three openings, thus indicating that the stiffness decreases accordingly. The using RPC layers effectively enhanced performance of hybrid beams when compared with using the normal strength concrete layers only. The using RPC layers in compression and tension zones increased the ultimate load about 47 % for beams with two opening located in shear zone, when using RPC in the tension zone and normal strength concrete in the compression zone the ultimate flexural load and ultimate deflection increase little compared with normal concrete.

scholarly journals Load-defl ection behaviour of hybrid concrete flat slab

2019 ◽  
Vol 28 (4) ◽  
pp. 516-525 ◽  
Author(s):  
Ragheed Makki ◽  
Haider Al-Katib ◽  
Ahmed Alalikhan
Keyword(s):  
High Strength Concrete ◽  
High Strength ◽  
Tension Zone ◽  
Compression Zone ◽  
Normal Strength Concrete ◽  
Flat Slab ◽  
Strength Concrete ◽  
Flat Slabs ◽  
Tension And Compression ◽  
Normal Strength

Due to the important role of high strength concrete in the structural systems, present work focuses on the use of this material as a strengthening technique incorporating with the normal strength concrete in flat slab system. Eight simply supported flat slab models with (1,000 × 1,000 × 120 mm) dimensions are investigated based on three groups including normal strength concrete and high strength concrete. The first group represents models containing of two flat slabs fully with one type of concrete; NSC and HSC as control flat slab. The second and third groups consist of six flat slabs as hybrid flat slabs of two layer of concrete with different thicknesses. Concrete mixture HSC was used in tension zone in three hybrid flat slabs (second group) with three thicknesses (30, 60 and 90 mm), while the remaining three hybrid flat slabs (third group) was used the HSC in compression zone with the same previous thicknesses. The experimental results shown that the ultimate load increased about (19.4%) when HSC was used fully (hH / h = 1) instead of using NSC in the control flat slab (NSC slab). The hybrid flat slabs with use HSC in compression zone showed higher in cracking and ultimate flexural loads compared with those of the hybrid flat slabs with use HSC in tension zone and also were stiffer in load-defl ection curve with the hybrid flat slabs with HSC in tension zone, also the hybrid flat slabs showed an improvement in the cracking load and ultimate flexural load when increasing the thickness of the HSC layer (hH / h) in both tension and compression zone as compared to control flat slab (NSC slab).

scholarly journals Behaviour of ultra-high performance fibre reinforced concrete beam-column joint under cyclic loading

2017 ◽  
Author(s):  
Charles K.S. Moy ◽  
Jun Xia ◽  
Chee Chin ◽  
Jianzhong Liu
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Loading ◽  
High Performance ◽  
Fibre Reinforced Concrete ◽  
Normal Strength Concrete ◽  
Joint Region ◽  
Strength Concrete ◽  
Column Joint ◽  
Normal Strength ◽  
High Performance Fibre

Ultra-high performance fibre reinforced concrete (UHPFRC) has very high compressive strength up to 200 MPa and exhibits strain hardening effects under flexural loading. The bond strength between UHPFRC and steel reinforcement is much better than the normal strength concrete. Therefore, there is a potential to use UHPFRC material at the beam-column joint region to reduce the congestion of reinforcement as well as to improve the seismic resistance of the structure. In this pilot study, the beam column joints made of normal strength concrete and UHPFRC were tested under lateral cyclic loading up to failure using a 500 tonne capacity computer control servo hydraulic machine. The specimen with normal strength concrete failed at the joint region while the specimen with UHPFRC material failed due to yielding of the rebars in the beam sections near the column face and no obvious cracks were observed at the joint area. The specimens with UHPFRC as joint material exhibited higher initial lateral stiffness and achieved slightly higher ultimate load capacity than the specimen with normal strength concrete.

scholarly journals Behavior Evaluation of Ultrahigh-Performance Concrete Beam Containing Para-Aramid Fibers

2019 ◽  
Vol 2019 ◽  
pp. 1-17
Author(s):  
Seung-Ki Kim ◽  
Woosuk Kim ◽  
Sang-Mook Han
Keyword(s):  
Reinforced Concrete ◽  
Experimental Research ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Fiber Diameter ◽  
Reinforced Concrete Beams ◽  
Flexural Behavior ◽  
Aramid Fibers ◽  
Normal Strength Concrete ◽  
Normal Strength

This experimental research was performed to evaluate the shear and flexural behavior for two cases of reinforced concrete beams: ultrahigh-performance concrete (UHPC) and normal-strength concrete jacketed with UHPC. The experiment was performed to examine the optimum para-aramid fiber to reinforce the ductile UHPC, with the test variables fiber diameter and length. Beam tests were then performed to evaluate the performance of the UHPC and jacketed beams. The UHPC beam tests with and without stirrups were conducted to evaluate flexural and shear behavior, respectively. The beam tests with and without jacketing were conducted to evaluate the reinforcement performance of UHPC.

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