scholarly journals Flexural Performance of Rubberized Concrete Panels Reinforced with Polymer Grid

2006 ◽  
Vol 1 (2) ◽  
pp. 99-117 ◽  
Author(s):  
Ashraf M Ghaly
Keyword(s):  
Brittle Failure ◽  
Significant Proportion ◽  
Rubberized Concrete ◽  
Conventional Concrete ◽  
Concrete Panels ◽  
Flexural Performance ◽  
Extreme Wind ◽  
Wind Pressures ◽  
Flexural Resistance ◽  
Considerable Deformation

The disposal of discarded tires is a problem of significant proportion. In the present experimental study, rubber produced from the granulation of discarded tires was used as an additive to replace certain portions of mineral aggregates in concrete. This rubberized concrete was used in making thin panels. A layer of polymer grid was used to reinforce the rubberized concrete panels. These panels were developed to study their performance in applications where the concrete could be subjected to flexure. Buildings constructed in areas with extreme wind pressures resulting from hurricanes or tornadoes are examples of structures that require concrete that can handle considerable deformation without failing catastrophically. Three different panel thicknesses, three different water-cement ratios, and three different rubber contents were the parameters evaluated in this study. All panels were loaded in bending with two equal loads applied at two equal distances from the supports. Test results showed that the flexural resistance of the panel increases with an increase in the thickness of the section, and with a reduction in the water-cement ratio of the concrete. The panels behaved in a ductile manner and there were no signs of brittle failure. Considerable deformation was measured during load application where loaded panels fractured but remained intact relying on the elongating polymer reinforcement. In addition to the lightweight properties, it was concluded that rubber concrete and polymer grid could be used as effective tools to impart ductility to the concrete and to control the mode and nature of the brittle failure of conventional concrete.

Flexural Performance of Reinforced Concrete Built-up Beams with SIFCON

2020 ◽  
Vol 38 (5A) ◽  
pp. 669-680
Author(s):  
Ghazwan K. Mohammed ◽  
Kaiss F. Sarsam ◽  
Ikbal N. Gorgis
Keyword(s):  
Reinforced Concrete ◽  
Ultimate Load ◽  
Concrete Beams ◽  
Steel Fibers ◽  
Reinforced Concrete Beams ◽  
Load Carrying Capacity ◽  
Conventional Concrete ◽  
Flexural Performance ◽  
Load Carrying ◽  
Fiber Concrete

The study deals with the effect of using Slurry infiltrated fiber concrete (SIFCON) with the reinforced concrete beams to explore its enhancement to the flexural capacity. The experimental work consists of the casting of six beams, two beams were fully cast by conventional concrete (CC) and SIFCON, as references. While the remaining was made by contributing a layer of SIFCON diverse in-depth and position, towards complete the overall depths of the built-up beam with conventional concrete CC. Also, an investigation was done through the control specimens testing about the mechanical properties of SIFCON. The results showed a stiffer behavior with a significant increase in load-carrying capacity when SIFCON used in tension zones. Otherwise high ductility and energy dissipation appeared when SIFCON placed in compression zones with a slight increment in ultimate load. The high volumetric ratio of steel fibers enabled SIFCON to magnificent tensile properties.

Nonlinear Analysis of R.C Beams Strengthened with CFRP

2012 ◽  
Vol 166-169 ◽  
pp. 1517-1520
Author(s):  
Wen Sheng Li ◽  
Kai Wang
Keyword(s):  
Finite Element ◽  
Carbon Fiber ◽  
Nonlinear Analysis ◽  
Element Model ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Element Analysis ◽  
Flexural Performance ◽  
Reinforced Polymer ◽  
Flexural Resistance

In order to study on the flexural performances of beams strengthened with external bonded carbon fiber reinforced polymer（CFRP）sheets, nonlinear analysis is carried out by using software ANSYS. The results show that a reasonable finite element model, using a reasonable solution strategy can be a good simulation of CFRP flexural performance of reinforced concrete beams, and finite element analysis results with the experimental results have good consistency .The beams reinforced by carbon fiber polymer，the capacity of flexural resistance increased with the numbers of carbon fiber paste sheets, reinforced components of flexural capacity significantly improved, but the extent of its increase is not proportional with the numbers of carbon fiber paste sheets.

scholarly journals Behavior of unconfined and CFRP confined rubberized concrete

2019 ◽  
Vol 15 (1) ◽  
pp. 65-83
Author(s):  
Rana Faisal Tufail ◽  
Xiong Feng ◽  
Muhammad Zahid
Keyword(s):  
Compressive Strength ◽  
Axial Strain ◽  
High Strength ◽  
Deformation Capacity ◽  
Rubberized Concrete ◽  
Conventional Concrete ◽  
Externally Bonded ◽  
Axial Compressive Strength ◽  
Strength And Deformation ◽  
Strength Models

Abstract The use of rubberized concrete (RuC) is an effective environmental approach to reduce the amount of scrap tires around the world. However, there are serious concerns regarding the compressive strength of RuC. This article investigates the use of externally bonded carbon fiber reinforced polymer (CFRP) jackets on RuC to develop a novel high strength and deformable CFRP confined RuC. In this study, 66 RuC cylinders were cast with 0, 10, 20, 30, 40 and 50% fine or coarse rubber to replace mineral aggregates. The RuC cylinders were then confined with one, two or three layers of CFRP jackets. The results indicated 208% high lateral strains in unconfined RuC as compared to the conventional concrete. CFRP jacketing was highly effective for enhancing the compressive strength and deformation capacity of RuC, where high compressive strength enhancement of 52 MPa and deformation capacity (317% axial strain) was achieved. The confined compressive strength test results were compared with the strength models to assess their validity for CFRP confined RuC. An analysis-oriented strength model was developed to predict the axial compressive strength of RuC confined by CFRP jackets. Overall, this study demonstrated the potential of using CFRP-confined RuC as a new structural material with improved strength and deformation.

Correlation of strength, rubber content, and water to cement ratio in rubberized concrete

2005 ◽  
Vol 32 (6) ◽  
pp. 1075-1081 ◽  
Author(s):  
Ashraf M Ghaly ◽  
James D Cahill IV
Keyword(s):  
Compressive Stress ◽  
Experimental Testing ◽  
Concrete Strength ◽  
Crumb Rubber ◽  
Test Results ◽  
Rubberized Concrete ◽  
Rubber Content ◽  
Research Project ◽  
Conventional Concrete ◽  
Cement Ratio

Waste rubber tires that cannot be processed for useful applications are numbered in the millions around the world. The build up of old rubber tires in landfills is commonly considered a major threat to the environment, and it is unquestionably a burden on landfill space. This research project was an investigation into the possibility of using fine rubber particles in concrete mixtures. The experimental testing program was designed to study the effect of the addition of crumb rubber, as replacement of a portion of fine aggregates (sand), on the strength of concrete. Rubber was added to concrete in quantities of 5%, 10%, and 15% by volume of the mixture. Three different water/cement ratios were used: 0.47, 0.54, and 0.61. A total of 180 concrete cubes were made. The cubes were tested in compression at 1, 7, 14, 21, and 28 d with the load continuously and automatically measured until failure. The load values were used to calculate compressive stress as related to different rubber contents and water/cement ratios. Compression test results were used to develop several plots relating rubber content and water/cement ratio to compressive stress of concrete. Test results gathered in this research project indicated that the addition of crumb rubber to concrete results in a reduced strength as compared with that of conventional concrete. Based on the experimental results, correlations have been developed to estimate the reduction in concrete strength as a function of the rubber content in the mix.Key words: compressive strength, concrete, crumb rubber, rubberized concrete.

scholarly journals Experimental investigation on flexural performance of functionally graded concrete beams using flyash and red mud

2021 ◽  
Vol 26 (1) ◽  
Author(s):  
Sureshkumar Muthu Palaniappan ◽  
Vennila Govindasamy ◽  
Abdul Bari Jabar
Keyword(s):  
Fly Ash ◽  
Red Mud ◽  
Concrete Beam ◽  
Functionally Graded ◽  
Continuous Change ◽  
Conventional Concrete ◽  
Graded Materials ◽  
Flexural Performance ◽  
Alternative Materials ◽  
Electron Microscope Analysis

ABSTRACT The continuous change in the strength and other properties, environmental problems, hike in cement price, advancement of construction industry makes the usage of alternative materials as Functionally graded materials (FGM) which leads to a new materials on concrete as Functionally graded concrete (FGC), In this present paper, investigation has carried out on the functionally graded concrete by using red mud and also fly ash. In this M20 grade of concrete is used as the conventional concrete in compression zone and M25 with the replacement of cement by red mud and flyash with varying percentage (5%, 10% 15%) respectively in the tension zone. The results indicated that the 10% of the red mud and 10% of the fly ash as the optimum value for the concrete beam and by load deflection curve, it is evident that functionally graded concrete beam has more advantages than ordinary concrete since it has more durability and strength characteristics. Scanning electron microscope analysis was also carried out on the red mud functionally graded concrete and fly ash functionally graded concrete. It clearly indicated the pores present in the materials which tends to increase in strength of the concrete.

Experimental Investigation into Flexural Performance of Reinforced Profiled Steel Decking

2021 ◽  
Vol 879 ◽  
pp. 243-253
Author(s):  
Mohammad Amirulkhairi Zubir ◽  
Fadzil Mat Yahaya
Keyword(s):  
Concrete Slab ◽  
Load Capacity ◽  
Cost Effective ◽  
Element Model ◽  
Experimental Program ◽  
Conventional Concrete ◽  
Flexural Performance ◽  
Flexural Response ◽  
Bending Capacity ◽  
Full Scale Tests

Cold-formed profiled steel decking composite slab is one of the most widely used system of slab after conventional concrete slab for building structure. It is cost effective, straightforwardly designable and readily available in the market for construction. However due to modern architectural desire of large span building, this system weakness that is the requirement of temporary propped support may have an impact toward its cost effectiveness. Generally more propped support are required with the increase of slab span design.This paper present the result of laboratory test on the behavior of reinforced profiled steel decking under loading to increase the span for unpropped composite slabs construction. The load capacity of the steel decks was amplified by reinforcing cold formed C channel on the top flange of steel decks. The experimental program comprises 12 full-scale tests of three length with a set of modification of profiled steel decking using cold formed C channel.The result shown experimental evidence of the role played by the cold formed C channel on altering the cross section properties which supporting the bending capacity of the steel decks. The flexural response of the steel deck was examined using the LVDT instruments to capture the deformation at three points. The finding delivered by the experimental data for the performance of reinforced profiled steel decking are set as the base for the future verification of finite element model.

scholarly journals Behaviour of hybrid fibre reinforced concrete-filled steel tubular beams and columns

2020 ◽  
Vol 25 (1) ◽  
Author(s):  
Kathiresan Karuppanan ◽  
Vennila Govindasamy
Keyword(s):  
Reinforced Concrete ◽  
Volume Fraction ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Fiber Volume ◽  
Polypropylene Fibres ◽  
Conventional Concrete ◽  
Flexural Performance ◽  
Tubular Sections

ABSTRACT This paper presents the flexural performance of newly developed hybrid fiber reinforced concrete-filled steel tubular sections. The test parametres are fiber volume fraction and fiber hybridation ratio. Initially mechanical properties studied for 10 mono fiber reinforced concrete mixes using steel and Polypropylene fibres with 0.5%, 1.0%, 1.5%, 2.0% and 2.5% volume fraction. Based on the performance optimum fiber dosage was determined in each fiber, with the same volume fraction three different fiber hybridation was developed. Developed hybrid fiber reinforcement concrete, conventional concrete and optimum mono fiber reinforced concrete was used in the concrete-filled steel tubular beams and columns to determine the structural performance. The test results shows that, fiber reinforced concrete-filled steel tubular beams display significant improvement in the flexural performance.

scholarly journals Cumulative Effect of Crumb Rubber and Steel Fiber on the Flexural Toughness of Concrete

2017 ◽  
Vol 7 (1) ◽  
pp. 1345-1352
Author(s):  
B. H. Abu Bakar ◽  
A. T. Noaman ◽  
H. Md. Akil
Keyword(s):  
Reinforced Concrete ◽  
Steel Fiber ◽  
Rubber Particle ◽  
Cumulative Effect ◽  
Crumb Rubber ◽  
Fiber Reinforced Concrete ◽  
Rubberized Concrete ◽  
Steel Fiber Reinforced Concrete ◽  
Flexural Performance ◽  
Recycled Waste

Concrete properties, such as toughness and ductility, are enhanced to resist different impacts or blast loads. Rubberized concrete, which could be considered a green material, is produced from recycled waste tires grinded into different crumb rubber particle sizes and mixed with concrete. In this study, the behavior of rubberized steel fiber-reinforced concrete is investigated. Flexural performance of concrete beams (400×100×100 mm) manufactured from plain, steel fiber, crumb rubber and combination crumb rubber and steel fiber are also evaluated. Similarly, concrete slabs (500×500×50 mm) are also tested under flexural loading. Flexural performance of the SFRRC mixtures was significantly enhanced. The toughness and maximum deflection of specimens with rubber were considerably improved. Steel fiber/crumb rubber-reinforced concrete can be used for practical application, which requires further studies.

scholarly journals Behavior and Strength Predictions for CFRP Confined Rubberized Concrete under Axial Compression

2021 ◽  
Author(s):  
Rana Faisal Tufail ◽  
Xiong Feng ◽  
Danish Farooq ◽  
Nabil Abdelmelek ◽  
Éva Lublóy
Keyword(s):  
Compressive Strength ◽  
Axial Compression ◽  
Design Guidelines ◽  
Rubberized Concrete ◽  
Fiber Reinforced ◽  
Conventional Concrete ◽  
The North ◽  
Concrete Confinement ◽  
Current Design ◽  
Axial Compressive Strength

This paper presents experimental versus theoretical comparison of carbon fiber reinforced polymer (CFRP) confined rubberized concrete (a new structural material). A total of sixty six rubberized concrete cylinders were tested in axial compression. The specimens were cast using 0 to 50% rubber replacement. Twenty seven cylinders were then confined with one, two and three layers of CFRP jackets. Axial compression results of the experimental study were compared with the North American and European design guidelines. The results indicate that the addition of rubber content in the concrete leads to premature micro cracking and lateral expansion in concrete. This increased lateral dilation exploited the potential of FRP jackets. The axial compressive strength and strain values for CFRP confined RuC cylinders reached up to unprecedented 600 and 330 percent of unconfined samples. Furthermore, the current international design guidelines developed for conventional concrete confinement failed to predict the compressive strength of rubberized concrete. There is a strong need to re-evaluate the current design codes and their applicability to investigate fiber reinforced confined rubberized concrete. Moreover, the proposed equations in this research can better predict the axial compressive strength of FRP confined RuC.

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