Background and Aim: The aim of this study was to evaluate the effect of GLASS-FIBER on the flexural strength of composite resins.Methods & Materials: The study was done experimentally in which flexural strength of GLASS - FIBER reinforced composite resins were assessed with a three-point load test on 22 samples. 11 samples of composite resin blocks and 11 samples of composite resins reinforced with GLASS- FIBER were prepared in a mold of 25x6x2mm and stored in 100% of moisture for one month, until they were ready for testing in an Instron Universal Testing Machine using a crosshead speed of 1 mm/min. Student t test was used for statistical analysis.Result: Flexural strength in the first group was 22.39±3.38 MPa and in second group was 29.74±2.36 MPa. According to t test analysis, the difference between the two groups was statistically significant. (P<0.01).Conclusion: The results of this study suggest that the flexural strength of the FIBER-reinforced composite made from GLASS - FIBERs was more than composite resin.

Given the problems and disadvantages of FIBERGLASS vessels during and after the construction and during the operation at sea, this paper first examines the problems in manufacturing process and suggests appropriate solutions and strategies for solving them. Then, issues like repairmen and inspection are assessed. Advantages of FIBERGLASS vessels over others are also presented.

The FIBER-reinforced polymer (FRP) composites under different dynamic loads experienced various strain rates. Since mechanical behaviors of FIBER-reinforced polymer composites vary with the strain rate, the transient response of most of the composite structures will be dependent on the strain rate. In the present research, a comprehensive review of the previously published studies on the topic of strain-rate dependent properties of GLASS FIBER and its FIBER-reinforced composites, as the most common FRP composite, under dynamic loading was presented. At first, studies that presented the mechanical properties of the long GLASS FIBERs at various strain rates were extensively investigated. Furthermore, experimental studies on the effects of strain rate on different types of GLASS FIBER reinforced polymer composites were categorized and presented. Also, the strain-rate dependent behavior of the thermoset polymers was investigated. The various analytical and numerical models of macro-mechanics and micromechanics presented for this type of composites were reviewed comprehensively.

Objective: FIBER-reinforced composite (FRC) posts have recently become more popular for restoring endodontically treated teeth because of providing esthetics, better stress distribution and lower risk of root fracture. Resistance against tensile forces dislodging the post from the root canal is a prerequisite for these posts. This study aimed to evaluate the tensile retention (strength) of intracanal GLASS FIBER posts produced by three manufacturers.Methods: In this interventional study, the crowns of 30 sound human maxillary central incisors were cut at the cementoenamel junction and the roots were endodontically treated. Post space was prepared to a length of 10mm and the specimens were divided into three groups of 10. HtCo, Anthogyr and Svenskposts were used in groups 1, 2 and 3, respectively. The posts were cemented with Panavia F2 resin cement according to the manufacturer’s instructions. Specimens were then immersed in water at 37°C for 30 days and were then subjected to 7500 thermal cycles between 5-55oC. Intracanal tensile retention (strength) was measured at a crosshead speed of 0.5 mm/min. Data were analyzed using one-way ANOVA at p<0.05 level of significance.Results: The mean retention was 188.53 (15.43), 183.81 (16.37) and 192.19 (17.50) N in Htco, Anthogyr and Svensk posts, respectively. Statistical analyses showed no significant difference in this regard among groups (p=0.111).Conclusion: Within the limitations of this study, retention of HtCo GLASS FIBER posts in the root canals was similar to that of two other posts.

The purpose of this study is to investigate the influence of different types of FIBERs on the mechanical properties of hybrid composite materials. Long and short GLASS FIBERs (GF) and different types of organic FIBERs, viz. aramid FIBER, DuPont Kevlar-49 (KF), liquid crystalline polymer (LCP), and vinylon (VF) in hybrid composites, were used to reinforced the high density polyethylene (HDPE) matrix. The long FIBER hybrid composites were prepared in a "FIBER separating and flying machine," while the short FIBER hybrid composites were prepared in an "elastic extruder." The total amount of FIBERs used in both long and short FIBER hybrid composites was fixed at 20 vol%. The influence of FIBER content, length, and mixing ratio on mechanical properties, such as tensile, bending, Izod and high rate impact strength, as well as viscoelastic properties in the solid state, was studied. Fracture surfaces of the materials were also examined using a scanning electron microscopy.

FIBER reinforced concrete (FRC) has been used widely due to its advantages over plain concrete such as high energy absorption, post cracking behavior, flexural and impact strengths, arresting shrinkage crack. Toughness is the amount of energy that a concrete can withstand by impact forces before rupturing. Toughness is obtained from the area under the force- deflection curve in flexural and compressive test and is characterized by a coefficient called the toughness ratio. In this study, the effect of 3 percentage of GLASS FIBER (1, 2 and 3%) with two different size of 3 and 6 millimeter on flexural and compressive toughness of FRC were investigated. The flexural and compressive toughness were carried out in accordance with the JSCE-SF4. The results indicate that by increasing the length of GLASS FIBER, there is no significant change in the amount of flexural toughness. Mixtures with 3% GLASS FIBERs has the highest flexural toughness and mixtures with 2% GLASS FIBERs has the lowest flexural toughness. Among mixtures with the same length, the mixture with the higher percentage of GLASS FIBER had the highest compressive toughness.

Investigating the behavior of FIBER/polymer composite structures and the effect of various factors on their mechanical properties is vital in defining the design, manufacturing and troubleshooting process. In this paper, the changes in the mechanical behavior of the E-GLASS FIBER/polyester composite structure under the influence of thermal preloading on the GLASS FIBER fabric have been studied. For this purpose, in addition to performing mechanical tests, scanning electron microscopy (SEM) has been used to investigate the manner and nature of GLASS FIBER breakage as well as the cross-sectional area of FIBER fracture. Also, the changes in the state of the bonding agent on the surface of the GLASS FIBERs used in the woven fabric, in the initial conditions of as received fabric and also in its secondary conditions after applying thermal preload by placing it in an oven at 350 °C temperature was studied. In this regard, the Attenuated Total Reflectance (ATR) infrared spectroscopic analysis method was used. The results indicate a significant decrease in the mechanical properties of the manufactured composite, as a result of applying thermal preloading on plain fabric made of E-class GLASS FIBERs, before the impregnation stage with unsaturated polyester resin.

Durability of concrete structure in marine environments is a big issue for many decades due to chloride attack. Chloride penetrates the concrete structure and accelerates the corrosion process of reinforcement which decreases the life of those structures. Also shrinkage cracks in concrete play main role for chloride penetration through concrete surface. Many researchers tried to find easy and economical ways to obtain durable concrete in such marine region by use of supplementary cementitious material with proper curing regime. Also use of FIBER in concrete may arrest the shrinkage cracks, decreasing the chloride permeability and increasing the durability of concrete. Durability of concrete with GLASS FIBER and by replacement of cement and sand partially by supplementary cementitious material such as fly ash and pond ash, respectively is measured by conducting shrinkage test, bulk electrical resistivity, SEM and ultrasonic pulse velocity test. Based on various test result present research proposes an economical durable concrete with desired compressive strength by use of GLASS FIBER and supplementary cementitious material.

The use of FIBER reinforced polymers, FRP, is one of the methods for strengthening and retrofitting concrete structures. In this research, the strengthening of reinforced self-compacting concrete beams against shear, torsion and bending has been investigated using GFRP. For reinforcing the beams against shear, bending and torsion, the strips of GFRP were used in the forms of U-shape, straight on the bottom surface and screwed around the beams respectively. In this study, the experimental results were compared with the results of the numerical models and their accuracies were confirmed. Then reinforcement sheets were applied in one and two layers on concrete beam models. By studying the numerical results obtained from Abaqus software, it was observed that with the increase of cracks in the concrete beams, their stiffness decreased and then the stresses were tolerated by the adhesive layers and the GFRP sheets, which has led to an increase in the bearing capacity of the beams. The results of numerical finite elements modeling show that by reinforcing the concrete beams with one layer of GFRP, the load bearing capacities of the beams improved in shear and torsion about 32% and 47% respectively. Moreover, if two layers of reinforcement sheets were used, the shear and torsion capacities of the beams increased about 45% and 61% respectively. The bending capacities of the concrete beams strengthened with one and two layers of GFRP increased up to 32% and 48% respectively.

The transformation from a conventional consumption based society to a sustainable society is urgently required due to the pollution of the natural environment, the exhaustion of the natural resources and the decreasing capacity of the final waste disposal facilities. One of the ways to solve this problem is to use Building Demolished Waste (BDW) concrete as aggregates in structural concrete. The aggregates thus obtained can be called as Recycled Concrete Aggregate (RCA). Concrete is a versatile material with numerous applications, but the only problem with concrete is its brittle behaviour more so in recycled aggregate concrete. This brittleness in concrete can be overcome by dispersing FIBERs discretely in the material of concrete. In the present work, GLASS FIBER Reinforced Recycled Aggregate Concrete (GFRRAC) was developed. The mechanical properties of GFRAC with M20 & M40 grade concretes, for different replacements of Recycled Concrete Aggregate (RCA) in Natural Aggregate (NA) are presented. It was observed that there was 10-17% increase in split tensile strength and about 10-14% improvement in flexural strength with FIBER addition in recycled aggregate concrete. There is an improvement in the modulus of elasticity of concrete. The values of split, flexure and modulus of elasticity obtained were also compared with the Indian Standard Codal Provisions. The increased energy absorption capacity in GFRRAC indicates higher toughness and better post elastic deformations in the event of seismic actions.