Flexural behaviour and efficiency of CFRP-laminate reinforced recycled concrete beams: Optimization using linear weighted sum method

This study presents an investigation on the flexural behaviour of normally vibrated concrete and self-compacting concrete beams subjected to loading tests. Seven specimens were cast to investigate the flexural behaviour. This experimental analysis mainly varied the parameters such as (1) Percentage of coarse aggregate replacement (RCWA), and (2) percentage of Steel fibres. Results are exhibited in terms of flexural strength, stiffness, failure modes, and deflection curves. The test results revealed that RCWA could be successfully used in SCC. The flexural behaviour of beam decreased with the addition of RCWA. However, the addition of RCWA in combination with SF in SCC significantly improved the overall flexural behaviour. Finite element model also developed to study the behaviour of beams produced by SCC with RCWA content.

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Investigating Some Parameters Affecting Flexural Behaviour of Reinforced Concrete Beams Strengthened with CFRP Laminate

Journal of World Architecture ◽

10.26689/jwa.v2i3.633 ◽

2018 ◽

Vol 2 (5) ◽

Author(s):

Azad A. Mohammed

Keyword(s):

Reinforced Concrete ◽

Concrete Beams ◽

Load Capacity ◽

Reinforced Concrete Beams ◽

Flexural Behaviour ◽

Ultimate Load Capacity ◽

Cfrp Laminate ◽

Steel Rebar ◽

Effective Depth ◽

Strengthened Beam

In this paper, the influence of some important parameters affecting flexural behaviour of reinforced concrete beams strengthened with one layer of CFRP laminate has been studied. For this purpose, six reinforced concrete beams were cast and tested in the laboratory. Based on the obtained data, when CFRP laminate is applied to the tension face, too close to the steel rebar, the flexural strength of the strengthened beam is reduced. In general, the performance of the beam strengthened with one wide CFRP strip is better than that strengthened with two equivalent narrow strips. Ultimate load capacity of each strengthened beam was calculated based on the method given by the ACI 440.2R and compared with the test one. It is concluded that to avoid the steel rebar-CFRP laminate interaction effect, the CFRP laminate depth to the effective depth ratio (df / d) should not be smaller than about 1.17.

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Flexural behaviour of hollow concrete beams under three points loading: Experimental and numerical study

Structures ◽

10.1016/j.istruc.2021.03.094 ◽

2021 ◽

Vol 32 ◽

pp. 1543-1552

Author(s):

A.S. Elamary ◽

I.A. Sharaky ◽

M. Alqurashi

Keyword(s):

Concrete Beams ◽

Numerical Study ◽

Flexural Behaviour

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Effect of Fiber Volume Fraction on Behavior of Concrete Beams Made with Recycled Concrete Aggregates

MATEC Web of Conferences ◽

10.1051/matecconf/201925302004 ◽

2019 ◽

Vol 253 ◽

pp. 02004

Author(s):

Wael Alnahhal ◽

Omar Aljidda

Keyword(s):

Fiber Volume Fraction ◽

Concrete Beams ◽

Volume Fraction ◽

Recycled Concrete ◽

Flexural Behavior ◽

Beam Specimen ◽

Rc Beam ◽

Fiber Volume ◽

Concrete Aggregates ◽

Recycled Concrete Aggregates

This study investigates the effect of using different volume fractions of basalt macro fibers (BMF) on the flexural behavior of concrete beams made with 100% recycled concrete aggregates (RCA) experimentally. A total of 4 reinforced concrete (RC) beam specimens were flexural tested until failure. The parameter investigated included the BMF volume fraction (0%, 0.5%, 1%, and 1.5%). The testing results of the specimens were compared to control beam specimen made with no added fibers. The experimental results showed that adding BMF improves the flexural capacity of the tested beams.

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