scholarly journals Strength and Durability of Hybrid Fiber-Reinforced Latex-Modified Rapid-Set Cement Preplaced Concrete for Emergency Concrete Pavement Repair

2021 ◽  
Vol 11 (10) ◽  
pp. 4595
Author(s):  
Su-Jin Lee ◽  
Hyung-Jin Shin ◽  
Chan-Gi Park
Keyword(s):  
Coarse Aggregate ◽  
Weight Ratio ◽  
Single Type ◽  
Poly Vinyl Alcohol ◽  
Roller Compaction ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Hybrid Fibers ◽  
Reinforcing Fibers ◽  
Strength And Durability

The benefits of using reinforcing fibers in latex-modified rapid-set cement preplaced concrete for emergency pavement repairs were examined in terms of strength, permeability, and durability as functions of the type of fiber. Single-type fibers, including jute, poly (vinyl alcohol) (PVA), and nylon fibers, as well as hybrid fiber mixtures prepared with two of the aforementioned fibers at a 1:1 weight ratio, were evaluated. Fibers were incorporated into the concrete mixture at 1.2 kg/m3. A vibratory press compactor that simulates roller compaction was used to increase compaction and densification of the resulting pavement repair material. The hybrid fiber-reinforced latex-modified rapid-set cement preplaced concrete (HFLMC) was manufactured to satisfy the criteria for opening traffic, i.e., compressive strength of 21 MPa or higher, and flexural strength of 3.5 MPa or higher after 4 h. Pavement requiring repair was removed and replaced with coarse aggregate. The rapid-set binder, fibers, and latex were then mixed and placed onto the coarse aggregate layer. The repair was considered complete after compaction. The resulting HFLMC satisfied all of the test criteria. Furthermore, concretes made with hybrid fibers were more mechanically sound than those made with a single fiber variety. Hybrid fiber concretes made with PVA and nylon fibers exhibited the best properties for emergency pavement repair. These results indicate that HFLMC is suitable for emergency pavement repair.

scholarly journals Seismic and Structural Behavior of RCC Beams Made With Hybrid Fiber Reinforced Self Consolidating Concrete

2019 ◽  
Vol 8 (3) ◽  
pp. 2849-2854
Keyword(s):  
Building Materials ◽  
Absorption Capacity ◽  
Structural Behavior ◽  
Fiber Reinforced ◽  
Hybrid Fibers ◽  
Sustainable Building ◽  
Self Consolidating Concrete ◽  
Micro Cracks ◽  
Modeling Software ◽  
Strength And Durability

Concrete is one of the significant building materials in the field of construction which plays an important role that it provides strength and durability properties to the structure. In recent days, modern construction is to improvise the above mentioned properties of concrete with the available sustainable building materials. Self consolidating concrete (SCC) has the ability to make a viscous concrete which can be considered as the pump able concrete with no segregation and compacted itself by its own weight. In this study, fly ash based SCC of grade M40 (1:1.85:1.14) was considered to produce RCC beams of cross section 150 x 200mm of length 1800mm. In order to increase the strength of SCC and to minimize the effect of micro cracks in the RCC beams, hybrid fibers which compose of steel and polypropylene fibers were added into the concrete mixes. Totally 12 beam specimens were prepared with fiber reinforced SCC to check the structural behavior of RCC beams. Finite element modeling software package of ANSYS was used to analyze the structural behavior of RCC beams numerically and the results were compared with the experimental results. From the experimental investigation, the seismic behavior of RCC beams under varying loading condition was examined such as ductility factor, energy absorption capacity and stiffness degradation of the beams.

scholarly journals Development of hybrid steel-basalt fiber reinforced concrete – in aspects of flexure, fracture and microstructure

2021 ◽  
Vol 20 (1) ◽  
pp. 62-90
Author(s):  
J. Vinotha Jenifer ◽  
◽  
D. Brindha ◽  
Keyword(s):  
Reinforced Concrete ◽  
Coarse Aggregate ◽  
Volume Fraction ◽  
Basalt Fiber ◽  
Copper Slag ◽  
Fiber Reinforced Concrete ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Fiber Reinforced ◽  
Hybrid Fiber

The conventional concrete is considered to be critical in various constructional applications due to its setbacks such as service load failures, brittle property, low ductility and low tensile capacity. Apart from the natural bridging mechanism (aggregate bridging), an additional bridging mechanism is necessary to overcome the existing setbacks in plain cement concrete. Thus concrete with one or more types of fibers in suitable combinations can augment the mechanical performance of concrete causing a positive synergy effect. Along with the two control mixes with and without copper slag as partial replacement of fine aggregate, two different groups of hybrid combination of fibers such as steel and basalt were cast with 3 different groups of coarse aggregate proportions of sizes 20 mm and 12.5 mm. The hybridization of fibers is assessed in this study under compression, tension, flexure and fracture. Stress-strain data were recorded under compression to validate the strain capacity of the mixtures. The mechanical properties were analyzed for the positive hybrid effect and the influencing factors were copper slag, hybrid fiber combination and coarse aggregate proportions. The optimum volume fraction of fibers and mix proportions were highlighted based on various behaviors of concrete. Steel as macro fibers and basalt as microfibers were examined under microstructural studies (SEM and EDX). The results from the flexural toughness showcased the potential of hybrid fibers with greater energy absorption capacity ensuring the ductile property of the proposed hybrid fiber reinforced concrete.

Development and Application of High Performance Green Hybrid Fiber-Reinforced Concrete (HP-G-HyFRC) for Sustainable and Energy-Efficient Buildings

2014 ◽  
Vol 629-630 ◽  
pp. 299-305 ◽  
Author(s):  
Rotana Hay ◽  
Claudia Ostertag
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Fiber Volume Fraction ◽  
Volume Fraction ◽  
Fiber Reinforced Concrete ◽  
Industrial Wastes ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Hybrid Fibers ◽  
Fiber Volume

The synergy of hybrid fibers allows for an enhanced concrete composite performance at a lower fiber volume fraction as compared to other types of fiber-reinforced concrete. This paper outlines the development process and properties of a new concrete composite termed high-performance green hybrid fiber-reinforced concrete (HP-G-HyFRC). Steel and polyvinyl alcohol (PVA) fibers were used as discontinuous reinforcement of the composite. Up to 60% of cement by mass was replaced by industrial wastes comprising slag and fly ash. At water-binder ratio of 0.25 and with the presence of coarse aggregates, careful proportioning of the mix constituents allows for a composite that is highly flowable. At a combined fiber volume fraction of only 1.65%, the composite also exhibits a deflection hardening behavior which is known to be beneficial for both serviceability and durability of structures. The composite was proposed to be used in an innovative double skin façade (DSF) system consisting of 30 mm air gap in between two thin HP-G-HyFRC skins with no main reinforcing rebars. It was shown that the DSF system alone allows for about 7.6% reduction of cooling energy in buildings.

Assessment of Self-Consolidation Concrete Produced with Micro Steel and Macro Synthetic Polyolefin Fibers

2020 ◽  
Vol 1002 ◽  
pp. 594-603
Author(s):  
Dalya H. Hameed ◽  
Abeer Abduljabbar Al-Saeedi
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Precast Concrete ◽  
Ductile Failure ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Hybrid Fibers ◽  
Synthetic Fibers ◽  
Toughness Index ◽  
Matrix Control

In the field of precast concrete, the utilize of fiber reinforced self-consolidation concrete (SCC) has big potential as it can be supplied directly into the molds without any effort for vibration or compacting. Likewise, depending on the design requirements, it has the potential to supplant conventional steel reinforcement. The using of one type of fiber in producing of SCC has been usual. Fiber reinforced self-consolidation concrete (FSCC) contains two type or more of fiber can improve the mechanical properties and may cause performance synergies. This paper investigates the combination of fibers, often referred to as hybridization, for a cementitious matrix. Control, single, two hybrid fibers were cast using different steel and macro synthetic fibers ratios. Fresh behavior, such as the ability to flow and fill and the tendency to segregate, was evaluated by a special SCC test based on its specifications. Moreover, compressive strength, splitting tensile strength, flexural strength, ductility, toughness, and the load - deflection relationship were determined to assess the hardened behavior. The results showed that the compressive strength of hybrid fiber mixes slightly improved. The increment in splitting and flexural strength for hybrid mixes was (60 and 58) % respectively. Also, these hybrid fiber mixes represent a more ductile failure further, the high toughness index, which reaches to 45% of control mix.

scholarly journals A Study on Tensile Strengths of Randomly Oriented Coir/Plantain Hybrid Fiber Reinforced Polyester (CPFRP) Composites

2020 ◽  
Vol 5 (2) ◽  
pp. 138-145
Author(s):  
Christian Ebele Chukwunyelu ◽  
A. W. Nwosu ◽  
Innocent Tochukwu Uzoghelu
Keyword(s):  
Tensile Strength ◽  
Polyester Resin ◽  
Volume Fraction ◽  
Testing Machine ◽  
Quality Characteristics ◽  
Resin Composites ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Hybrid Fibers ◽  
Control Factors

This study focuses on determining the optimum tensile strengths of randomly oriented coir/plantain hybrid fiber reinforced polyester resin composites. The control factors of volume fraction, coupling agent and coir/plantain fiber ratio were used in forming the samples. Tensile test was conducted on the samples of Coir/plantain empty fruit bunch (CEFB) hybrid fibers and coir/plantain pseudo stem (CPS) hybrid fibers reinforced polyester resin composites respectively for the optimum tensile strengths. An OKH-600 Digital Display universal Testing Machine was used for conducting tensile tests in order to establish the control factor levels quality characteristics needed to optimize the mechanical properties being investigated. The highest signal-to-noise ratio (S/N ratio) for the quality characteristics was investigated by applying Taguchi robust design technique for the greater-the-better. The optimum values of the control factors were established for CEFB and CPS hybrid fibers reinforced polyester resin composites. The CEFB hybrid fibers reinforced polyester resin composites has the optimum tensile strength of while CPS hybrid fibers reinforced polyester resin composites has the optimum tensile strength of . The control factors contributed greatly to the tensile strength; and the CEFB hybrid fibers reinforced polyester resin composites are less in tension than that of CPS hybrid fiber.

Orthogonal Test of Flexural Toughness for Hybrid Fiber Reinforced Concretes

2011 ◽  
Vol 239-242 ◽  
pp. 2006-2010
Author(s):  
Xiao Fan Liu ◽  
Guo Dong Mei ◽  
Ji Xiang Li ◽  
Yun Xia Lun
Keyword(s):  
Reinforced Concrete ◽  
Steel Fiber ◽  
Polypropylene Fiber ◽  
Fiber Reinforced Concrete ◽  
Test Results ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Hybrid Fibers ◽  
Concrete Matrix ◽  
Orthogonal Tests

Orthogonal tests are designed for hybrid fiber reinforced concrete. Bending toughness of hybrid fiber reinforced concrete, with the substrate intensity C30, the quantity of the volume for the steel fiber dosage 0~1.5% and polypropylene fiber dosage 0~0.3%, are studied. The results show that the hybrid fibers significantly improve the toughness of the concrete matrix. When the dosage reaches to a certain number, the affection of fiber toughness is decreased. Based on the test results the best dosage of hybrid fibers which is the steel fiber 1% mixed with 0.1% polypropylene fiber is recommended.

scholarly journals Optimization and Static Stress Analysis of Hybrid Fiber Reinforced Composite Leaf Spring

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Luay Muhammed Ali Ismaeel
Keyword(s):  
Hybrid Composites ◽  
Weight Ratio ◽  
High Strength ◽  
Leaf Spring ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Element Analysis ◽  
Shear Moduli ◽  
Good Convergence ◽  
Reinforced Composite

A monofiber reinforced composite leaf spring is proposed as an alternative to the typical steel one as it is characterized by high strength-to-weight ratio. Different reinforcing schemes are suggested to fabricate the leaf spring. The composite and the typical steel leaf springs are subjected to the same working conditions. A weight saving of about more than 60% can be achieved while maintaining the strength for the structures under consideration. The objective of the present study was to replace material for leaf spring. This study suggests various materials of hybrid fiber reinforced plastics (HFRP). Also the effects of shear moduli of the fibers, matrices, and the composites on the composites performance and responses are discussed. The results and behaviors of each are compared with each other and verified by comparison with analytical solution; a good convergence is found between them. The elastic properties of the hybrid composites are calculated using rules of mixtures and Halpin-Tsi equation through the software of MATLAB v-7. The problem is also analyzed by the technique of finite element analysis (FEA) through the software of ANSYS v-14. An element modeling was done for every leaf with eight-node 3D brick element (SOLID185 3D 8-Node Structural Solid).

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