scholarly journals Mechanical Performance and Environmental Assessment of Sustainable Concrete Reinforced with Recycled End-of-Life Tyre Fibres

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 256
Author(s):  
Magdalena Pawelska-Mazur ◽  
Maria Kaszynska
Keyword(s):  
Tensile Strength ◽  
Mechanical Performance ◽  
Image Correlation ◽  
The Novel ◽  
Micro Computed Tomography ◽  
Fibre Concrete ◽  
Wedge Splitting Test ◽  
Splitting Test ◽  
Wide Range ◽  
Physical Features

The presented research’s main objective was to develop the solution to the global problem of using steel waste obtained during rubber recovery during the tire recycling. A detailed comparative analysis of mechanical and physical features of the concrete composite with the addition of recycled steel fibres (RSF) in relation to the steel fibre concrete commonly used for industrial floors was conducted. A study was carried out using micro-computed tomography and the scanning electron microscope to determine the fibres’ characteristics, incl. the EDS spectrum. In order to designate the full performance of the physical and mechanical features of the novel composite, a wide range of tests was performed with particular emphasis on the determination of the tensile strength of the composite. This parameter appointed by tensile strength testing for splitting, residual tensile strength test (3-point test), and a wedge splitting test (WST), demonstrated the increase of tensile strength (vs unmodified concrete) by 43%, 30%, and 70% relevantly to the method. The indication of the reinforced composite’s fracture characteristics using the digital image correlation (DIC) method allowed to illustrate the map of deformation of the samples during WST. The novel composite was tested in reference to the circular economy concept and showed 31.3% lower energy consumption and 30.8% lower CO2 emissions than a commonly used fibre concrete.

Graphene oxide and zinc oxide decorated chitosan nanocomposite biofilms for packaging applications

2020 ◽  
Vol 40 (2) ◽  
pp. 152-157 ◽  
Author(s):  
Pınar Terzioglu ◽  
Yasin Altin ◽  
Ayse Kalemtas ◽  
Ayse Celik Bedeloglu
Keyword(s):  
Tensile Strength ◽  
Zinc Oxide ◽  
Graphene Oxide ◽  
Composite Film ◽  
Young’S Modulus ◽  
Mechanical Performance ◽  
Young's Modulus ◽  
Chitosan Film ◽  
Oxide Composite ◽  
Wide Range

AbstractRecently, due to sustainable development and environmental protection policies, there is increasing interest in the development of new biodegradable polymer-based multifunctional composites. Chitosan is one of the most remarkable and preferred biopolymers, which is environmentally friendly as well as renewable, biocompatible, and inexpensive. Though it has a wide range of potential applications, the major limitation of chitosan – the problem of poor mechanical performance – needs to be solved. In this work, graphene oxide was first produced and then used to manufacture a chitosan/graphene oxide/zinc oxide composite film through a casting method. The properties of the chitosan film and the chitosan/graphene oxide/zinc oxide composite film were investigated using Fourier transform infrared spectroscopy, mechanical, thermal gravimetric, and ultraviolet (UV)-visible spectroscopy analyses. The results showed that the incorporation of graphene oxide and zinc oxide into the chitosan matrix resulted in enhanced mechanical properties and thermal stability of chitosan biocomposite films. The graphene oxide- and zinc oxide-reinforced chitosan film showed 2527 MPa and 55.72 MPa of Young’s modulus and tensile strength, respectively, while neat chitosan showed only 1549 MPa and 37.91 MPa of Young’s modulus and tensile strength, respectively. Conversely, the addition of graphene oxide decreased the transmittance, notably in the UV region.

The effect of microfibrils cellulose modified epoxy on the quasi-static and fatigue behaviour of open hole carbon textile composites

2018 ◽  
Vol 52 (24) ◽  
pp. 3365-3380 ◽  
Author(s):  
Valter Carvelli ◽  
Toru Fujii ◽  
Kazuya Okubo
Keyword(s):  
Mechanical Performance ◽  
Fatigue Behaviour ◽  
Textile Composites ◽  
Image Correlation ◽  
Cellulose Microfibrils ◽  
Micro Computed Tomography ◽  
The Matrix ◽  
Open Hole ◽  
Static Tensile ◽  
Modified Epoxy

The extensive experimental investigation aimed to assess the effects of hybrid epoxy resin with micro-fibrillated cellulose on tensile quasi-static and fatigue behaviour of open hole carbon plain weave composites. The hybridization of the matrix allowed an improved damage tolerance of the composite leading to increase of the quasi-static tensile strength and extension of the fatigue life. The enhanced mechanical performance of the notched composites was connected to the bridging effect of cellulose microfibrils preventing or delaying the cracks propagation in the matrix and along the fibres interface. The better distribution of the stress state was assessed by digital image correlation strain maps around the hole and the imparted fatigue damage was analysed by scanning electron microscope and X-ray micro-computed tomography visualizations.

Study on the Effect of Matrix Properties on the Mechanical Performance of Carbon Fabric Composites

2013 ◽  
Vol 646 ◽  
pp. 38-43 ◽  
Author(s):  
Yong Zheng Shao ◽  
Nguyen T. Phong ◽  
Kazuya Okubo ◽  
Toru Fujii ◽  
Ou Shibata ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Carbon Fiber ◽  
Adhesive Strength ◽  
Mechanical Performance ◽  
Inverse Correlation ◽  
Wide Range ◽  
Fabric Composites ◽  
Matrix Properties ◽  
Different Types ◽  
Double Cantilever Beams

Carbon fiber (CF) reinforced compositesusing different types of vinylester (VE)resin includingconventional VE resinhave been prepared. The mechanical performance were characterized by different tests, such as tensile, mode-I interlaminarfracture toughness, tension-tension fatigue and scanning electron microscope (SEM).The experimental results showed that the tensile strength of CF/VE composites changed at a wide range from 22.3% to 37.8% in comparison with the CF/conventional VE composite due to resin type, where the strain at failure was varying. The tensile strength increased with an increase of adhesive strength between carbon fiber and VE resin characterized by the microdroplet test. Namely, a good correlation between the tensile strength of composites and the adhesive strength was found. On the other hand, almost an inverse correlation was found between the tensile strength of composites and the interlaminar fracture toughness of composites obtained by DCB (double cantilever beams) tests. There was no apparent correlation found between the strain at failure for pure resins and the tensile strength of composites.Thefatigue life of CF/VE compositesincreased as well as the tensile strength with an increase of the adhesive strength between carbon fiber and the resin. The samples sometime survived 1000 times longer than that of CF/conventional VE compositewhen the maximum cycle stress was 70% of the tensile strength of the strongest composite.

Study on the Constitutive Behavior and Damage Evolution in the FPZ of WST Specimens Using the Vic-2D and Strain Gauges

2013 ◽  
Vol 744 ◽  
pp. 161-164
Author(s):  
De Yu Liu ◽  
Kun Peng Su ◽  
Ai Min Deng
Keyword(s):  
Damage Evolution ◽  
Process Zone ◽  
Mechanical Tests ◽  
Image Correlation ◽  
Constitutive Behavior ◽  
Experimental Investigations ◽  
Non Invasive ◽  
Wedge Splitting Test ◽  
Splitting Test ◽  
Invasive Method

The Vic-2D is an innovate system that uses a non-invasive method called Digital Image Correlation (DIC) technique, which provides a contour map of strains of an entire specimen surface subject to mechanical tests, based on gray value digitalized images. The paper presents the results of experimental investigations of the constitutive behavior and damage evolution in the fracture process zone (FPZ) of concrete using the Vic-2D, in comparison with the traditional strain gauge method. The model tests were performed with notched concrete specimens via the Wedge Splitting Test (WST) method. During the tests, stress-strain curves and evolution of the damage variable were determined and analyzed at multiple levels. The results provide the achievements obtained and some limitations with both two methods.

scholarly journals Wedge-Splitting Test on Carbon-Containing Refractories at High Temperatures

2019 ◽  
Vol 9 (16) ◽  
pp. 3249 ◽  
Author(s):  
Stückelschweiger ◽  
Gruber ◽  
Jin ◽  
Harmuth
Keyword(s):  
Tensile Strength ◽  
Fracture Energy ◽  
Laser Speckle ◽  
Displacement Measurement ◽  
Ambient Atmosphere ◽  
Specific Fracture Energy ◽  
Wedge Splitting Test ◽  
Splitting Test ◽  
Specific Fracture ◽  
Wedge Splitting

The mode I fracture behavior of ordinary refractory materials is usually tested with the wedge-splitting test. At elevated temperatures, the optical displacement measurement is difficult because of the convection in the furnace and possible reactions of refractory components with the ambient atmosphere. The present paper introduces a newly developed testing device, which is able to perform such experiments up to 1500 °C. For the testing of carbon-containing refractories a gas purging, for example, with argon, is possible. Laser speckle extensometers are applied for the displacement measurement. A carbon-containing magnesia refractory (MgO–C) was selected for a case study. Based on the results obtained from tests, fracture mechanical parameters such as the specific fracture energy and the nominal notch tensile strength were calculated. An inverse simulation procedure applying the finite element method yields tensile strength, the total specific fracture energy, and the strain-softening behavior. Additionally, the creep behavior was also considered for the evaluation.

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