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.

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.

Stability Coefficient of Interlocking Compressed Earth Block Masonry under Axial Compression

2020 ◽  
Author(s):  
Tianya Wang ◽  
Yihong Wang ◽  
Guiyuan Zeng ◽  
Jianxiong Zhang ◽  
Dan Shi
Keyword(s):  
Compressive Strength ◽  
Axial Compression ◽  
Design Guidelines ◽  
Stability Coefficient ◽  
Strength Failure ◽  
Compressed Earth Block ◽  
Out Of Plane ◽  
The Stability ◽  
Earth Block ◽  
Plane Deformations

To investigate the effects of the height-thickness ratio (β) on the mechanical properties and stability coefficients (φs) of interlocking compressed earth block (ICEB) masonry members under axial compression, four groups of specimens with different β of 3.75, 6.75, 11.25, and 14.25 were tested, thereby assessing their stress process, failure mode, compressive strength, and in- and out-of-plane deformations. All the specimens underwent brittle failure under axial compression: the compressive strength was found to decrease in a range from 5.6% to 43% with increasing β, whereas the initial stacking defects and the in- and out-of-plane deformations increased. The specimens became less stable, and we noticed that the overall damage was caused by strength failure and not instability failures. Because the stability coefficient of ICEB-based masonry components cannot be calculated as those of more conventional brickwork, we combined our results with well-established masonry design guidelines and derived an interlocking improvement coefficient.

Behaviour of Externally Corroded Pipelines Under Axial Deformation

2010 ◽  
Author(s):  
Halima Dewanbabee ◽  
Jorge Silva ◽  
Abu Rafi ◽  
Sreekanta Das
Keyword(s):  
Test Procedure ◽  
Design Guidelines ◽  
Combined Loading ◽  
Axial Deformation ◽  
Current Design ◽  
Axial Compressive Strength ◽  
Pipeline Failure ◽  
Set Up ◽  
Buried Gas Pipeline ◽  
Full Scale Tests

Corrosion is a major cause for buried gas pipeline failure. Current design guidelines are limited to pressure loading for assessing a corroded pipeline’s integrity. A few studies were conducted by other researchers to determine the remaining bending or pressure strength of the corroded pipelines under combined loading. However, no study was conducted to determine the axial compressive strength and ductility of the corroded pipelines although these could be the major cause of the pipeline failure. Therefore, the current study was undertaken to understand how the corrosion geometry influences the structural behavior of externally corroded line pipes when they are subjected to axial deformation and internal pressure. Three full-scale tests have been completed and it was found that the pipe that was used in this study is highly ductile and do not rupture under monotonically increasing axial deformation. This paper discusses test set up, test procedure, and results obtained from these tests.

scholarly journals Experimental Investigation on the Ecofriendly External Wrapping of Glass Fiber Reinforced Polymer in Concrete Columns

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
D. S. Vijayan ◽  
A. Mohan ◽  
J. Jebasingh Daniel ◽  
V. Gokulnath ◽  
B. Saravanan ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Glass Fiber ◽  
Experimental Studies ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced Polymer ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Axial Compressive Strength ◽  
Strength And Deformation

An ecofriendly fiber reinforced polymer (FRP) had been used in the last decade to enhance the short concrete column’s strength and deformation capacity. This study involves the wrapping of FRP sheets with a thickness of 3 mm and 5 mm on a short column, and then the compressive strength is determined. The rectangular columns of size 150 mm × 300 mm are used for this study, and cast under the grades of M20 and M40 are wrapped with GFRP sheets at the thickness of 3 mm and 5 mm. These results are clarified at a specific thickness of the FRP-wrapped columns. It provides a maximum axial compressive strength, and Young’s modulus gets enhanced rigorously when it is to be compared to the normal concrete. This thesis deals with experimental studies of different parameters associated with wrapped glass fiber reinforced polymer (GFRP). In M20 grade, when the 3 mm wrapped specimen and the 5 mm wrapped specimen are compared, the specimen wrapped with 5 mm increases 5.182% more than the specimen wrapped with 3 mm. In M40 grade, when the 0 mm, 3 mm, and 5 mm wrapped specimens are compared, the specimen wrapped with 5 mm increases 2.47% more than the specimen wrapped with 0 mm. The 5 mm wrapping attains the maximum strength.

Basic Mechanical Properties of Concrete with Machine-Made Sand and Recycled Coarse Aggregate

2013 ◽  
Vol 357-360 ◽  
pp. 1102-1105 ◽  
Author(s):  
Shun Bo Zhao ◽  
Qi Guo ◽  
Guang Xin Li ◽  
Yan Feng Su
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Elastic Modulus ◽  
Coarse Aggregate ◽  
Cement Ratio ◽  
Recycled Coarse Aggregate ◽  
Water To Cement Ratio ◽  
Current Specification ◽  
Current Design ◽  
Axial Compressive Strength

Experimental study was carried out on the concrete mixed with machine-made sand and recycled coarse aggregate (MSRAC), three strength grades of concrete were designed by changing the water to cement ratio as 0.36, 0.45 and 0.55, while the sand ratio varied in a range of 32%~38%, 32%~42% and 38%~44% successively. The workability and the mechanical properties such as compressive and splitting tensile strengths and elastic modulus of MSRAC were tested. The results show that although the mechanical properties of MSRAC were influenced by sand ratio, they were still controlled by the water to cement ratio. The ratio of axial compressive strength to cubic compressive strength and the elastic modulus of MSRAC basically satisfy the specifications of the current design code for concrete structures. It should be noticed that the tensile strength of MSRAC is lower than current specification, and tends to reduce with the increase of water to cement ratio.

scholarly journals Force-Deformation Study on Glass Fiber Reinforced Concrete Slab Incorporating Waste Paper

2022 ◽  
Vol 2022 ◽  
pp. 1-10
Author(s):  
S. Praburanganathan ◽  
N. Sudharsan ◽  
Yeddula Bharath Simha Reddy ◽  
Chukka Naga Dheeraj Kumar Reddy ◽  
L. Natrayan ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Glass Fiber ◽  
Concrete Slab ◽  
Glass Fibers ◽  
Fiber Reinforced Concrete ◽  
Waste Paper ◽  
Fiber Reinforced ◽  
Reinforced Concrete Slab ◽  
Conventional Concrete ◽  
Glass Fiber Reinforced

This study inspects the viability of engaging the discarded paper wastes in concrete by varying the volume proportions from 0%–20% with each 5% increment in replacement of the weight of cement. A physiomechanical study was conducted, and the results were presented. A glass fiber reinforced rectangular slab with a longer span (ly) to shorter span (lx) ratio of (ly: lx) 1.16 was cast with optimum replacement of waste-paper mass and compared the force-deformation characteristics with the conventional concrete slab without waste paper. The optimum percentage of discarded papers for the replacement of cement is 5%. Also, the results imply that the compressive strength at the age of 28 days is 30% improved for the optimum replacement. Based on the outcomes of the investigation, it can be inferred that the compressive strength gets progressively reduced if the volume of the discarded paper gets increases. The incorporation of glass fibers improves the split and flexural strength of the concrete specimens considerably. The ultimate load-carrying capacity of the glass fiber reinforced waste paper incorporated concrete slab measured 42% lower than that of the conventional slab. However, development of the new type of concrete incorporating waste papers is the new trend in ensuring the sustainability of construction materials.

scholarly journals Experimental Study on Fiber Reinforced Concrete Using PVA Fiber and Glass Powder

2021 ◽  
Vol 9 (8) ◽  
pp. 2707-2713
Author(s):  
Vrushabh K. Hulle
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Flexural Strength ◽  
Polyvinyl Alcohol ◽  
Glass Powder ◽  
Strength Test ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Conventional Concrete ◽  
Pva Fiber

Abstract: Concrete consisting of cement, water, fine and coarse aggregates are widely used in civil engineering constructions. Though making concrete is convenient and inexpensive, its brittle behavior upon tensile loading is one of its undesirable characteristics so that leads to the development of fiber reinforced concrete or engineered cementitious composites to improve this deficient. The Flexural strength of PVA (polyvinyl alcohol) FRC (fiber reinforced concrete) can be 150-200% greater than for normal concrete. According to Structural designers the damage tolerance and inherent tight crack width control of PVA FRC is found to be impressive in recent full-scale structural applications. If proper volume fractions are used the compressive strength PVA FRC can be similar to that of conventional concrete. The aim of this research work is to study compressive and tensile strength of FRC consisting PVA fiber & glass powder and studying the effect of glass powder in it. This research also gives rough idea on crack resistance capacity of FRC. In this paper we studied and provided detailed review on properties of PVA FRC with glass powder and experimentally identified the best ECC mix by analyzing the compressive & the flexural strength at different ratios like 0.5%, 1%, 1.5% of PVA fiber of total dry mix weight and in each case 15% of fine aggregate was replaced by glass powder. By conducting the compressive strength test and flexural strength test the maximum result we get at 28 days is 28.38Mpa and 8.95Mpa respectively which is more durable as compared to conventional concrete by IS 516:1959. So by analysis of results it can be seen that 1% mix is found to be optimum in all aspects. Keywords: PVA FRC, Polyvinyl Alcohol, Fibre Reinforced Concrete, Glass Powder.

scholarly journals Experimental Study on Axial Compressive Performance of Polyvinyl Alcohol Fibers Reinforced Fly Ash—Slag Geopolymer Composites

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 142
Author(s):  
Shuhua Xiao ◽  
Yongjian Cai ◽  
Yongchang Guo ◽  
Jiaxiang Lin ◽  
Guotao Liu ◽  
...  
Keyword(s):  
Fly Ash ◽  
Polyvinyl Alcohol ◽  
Axial Compression ◽  
Short Fiber ◽  
Geopolymer Concrete ◽  
Fiber Reinforced ◽  
Low Calcium ◽  
The Matrix ◽  
Compressive Performance ◽  
Axial Compressive Strength

Geopolymer concrete (GC) has been gaining attention in research and engineering circles; however, it is a brittle material with poor tensile performance and crack resistance. To address these problems, we introduced fibers into GC. In this study, axial compression and scanning electron microscope (SEM) tests were carried out on polyvinyl alcohol (PVA) short fiber reinforced low-calcium fly ash-slag-based geopolymer concrete (PFRGC). The ratio of PVA short fibers and low-calcium fly ash on the compression behavior of fiber reinforced geopolymer concrete (FRGC) were investigated and discussed. The test results show that PVA fibers play a bridging role in the cracks of the specimen and bear the load together with the matrix, so the addition of PVA fibers delayed the crack propagation of GC under axial compression. However, with the increase of low-calcium fly ash/PVA fibers, the number of unreacted fly ash particles in PFRGCs increases. Too many unreacted fly ash particles make GC more prone to micro-cracks during loading, adversely affecting compressive properties. Therefore, the axial compressive strength, elastic modulus, and Poisson’s ratio of GC decrease with the increasing low-calcium fly ash/PVA fibers.

scholarly journals Axial impact behavior and energy absorption of rubberized concrete with/without fiber-reinforced polymer confinement

2018 ◽  
Vol 10 (2) ◽  
pp. 154-173 ◽  
Author(s):  
Thong M Pham ◽  
Mohamed Elchalakani ◽  
Ali Karrech ◽  
Hong Hao
Keyword(s):  
Energy Absorption ◽  
Impact Resistance ◽  
Fiber Reinforced Polymer ◽  
Sustainable Construction ◽  
Rubberized Concrete ◽  
Fiber Reinforced ◽  
Conventional Concrete ◽  
Reinforced Polymer ◽  
Maximum Impact Force ◽  
The Impact

This study investigates the axial impact resistance and energy absorption of rubberized concrete with/without fiber-reinforced polymer confinement. The impact tests were carried out using an instrumented drop-weight testing apparatus. The experimental results have shown that rubberized concrete significantly reduced the maximum impact force of up to 50% and extended the impact duration. These characteristics make rubberized concrete a promising material for protective structures and particularly for future sustainable construction of rigid roadside barriers. Glass fiber–reinforced polymer confinement is a very effective method to improve the impact resistance for both conventional concrete and particularly for rubberized concrete. It was found that the rubberized concrete reduced the maximum impact force so that it transferred a lower force to a protected structure as well as a lower rebound force, which is desirable for protection of passengers in an incident of vehicle collision. Interestingly, the rubberized concrete showed a lower energy absorption capacity as compared to conventional concrete, where the exact reason for this is unknown to the authors. Therefore, further research is sought to provide more understanding of the response of rubberized concrete under impact and improve its energy absorption. This study explored experimentally the use of rubberized concrete as a promising sustainable construction material for applications to construction of columns in buildings located in seismic active zones or subjected to terrorist attack, security bollards and rigid road side barriers.

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