Papers by Keyword: Flexural Strength

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Authors: Sahana Bajracharya, Sroisiri Thaweboon, Boonyanit Thaweboon, Amornrat Wonglamsam, Theerathavaj Srithavaj
Abstract: The aim of this study is to investigate the candidal biofilm formation on the silver nanoparticles (AgNPs) incorporated denture base heat-polymerized (poly methyl methacrylate), PMMA, resinand its flexural strength.Materials and methods:A total of 36PMMA resin specimens (15×15×2 mm3) were fabricated and divided into 4 groups based on their AgNPs contents (0%,0.5%, 1% and 1.5% w/w of polymer). The biofilm of clinical and reference strainsof C.albicanswere grown on PMMA resin specimens in the presence of yeast nitrogen base broth supplemented with 100 mM glucose at 37oC for 48 h and evaluated by tetrazolium reduction assay. The flexural strength of PMMA resin specimens (65×10×3.3 mm3) were tested by using three-point bending test. Data were analyzed by Kruskal-Wallis and Mann-Whitney U test at p<0.05. result:all="" 3="" groups="" with="" agnps="" showed="" significant="" reduction="" in="" biofilm="" formation="" of="" both="" strains="" i="">C.albicans compared to control (0% AgNPs) (p<0.05). Decreased flexural strength was observed with AgNPs groups compared with the control but within acceptable limit of ISO 20795-1. Conclusion:The reduction of the C. albicans biofilm was observed on the heat-polymerized PMMA resin incorporated with AgNPs. Regarding the flexural strength, the values were within ISO limit. These modified PMMA resin can be developed for the prevention or treatment of the candidal infection associated with the denture base material.
Authors: G. Sınmazışık, D. Şen, B. Tunçelli, E. Poyrazoğlu, Burak Özkal, M. Lutfy Öveçoğlu
Authors: Yan Wen Li, Xiao Xue, Zhuo Yang, Zhong Yu He, Jie Qin, Wei Dong Zhang, Li Jin Xu, Jian Qu, Ru Feng Jia
Abstract: The mechanical properties, including the compressive strength, flexural strength and adhesion strength of the rapid setting conventional and polymer-modified waterproof mortars are systematically compared in this paper. The polymer modification is demonstrated to increase the flexural strength and adhesion strength of the rapid setting waterproof mortar whereas it reduces its compressive strength.
Authors: Yu Peng Qian, Xiao Wei Zhang, Ying Bo Zhu
Abstract: In this paper, a new method of the preparation of mica composite insulation material without making mica paper is introduced. Firstly, the mica pulp and modified starch is mixed, and then preformed by ultrasonic dispersion, finally formed with three separation steps of hot-pressing. The flexural strength of mica composite insulation material can reach 229.5 N/mm2, the dielectric strength can reach 23.80KV/mm.
Authors: Harry Ku, Mohan Trada, Rezwanul Huq
Abstract: Vinyl ester resin was filled with of glass powder with a view to increasing the flexural strength of the composites for civil and structural applications by a research Centre on composites, University of Southern Queensland (USQ). In order to reduce costs, the Centre wishes to fill as much glass powder as possible to the resin subject to maintaining sufficient strength of the composites in civil and structural applications. This project varies the percentage by weight of the glass powder in the composites, which are then subjected to flexural tests. The flexural strength and strain of the glass powder filled vinyl ester composites decreased with increasing filler content but the flexural modulus was highest at 20 w/t % of glass powder. Scanning Electron Microscope (SEM) was used to analyze the fractured samples and it was found that the fractured surfaces examined were correlated with the flexural properties.
Authors: Salim Barbhuiya, Hamid Nikraz
Abstract: The global development and current trends in social attitude are resulting in an increase in the amount of waste generated by society, the treatment and disposal of which are becoming a serious problem. Therefore, waste management is one of the most important aspects in ensuring sustainable development in todays world. Some of the industrial by-products, such as pulverised-fuel ash (PFA), ground granulated blast-furnace slag (GGBS) and microsilica (MS) can be used in concrete to improve its properties. In this paper the influence of various by-products on the physical properties of concrete is reviewed.
Authors: Jin Ping Lu, Sherly Wijaya
Abstract: The durability of marine concrete structures has long been a concern of many countries, especially in the island country of Singapore, where many structures are constructed along coastal areas. Currently, the durability of concrete under marine conditions can be enhanced by the addition of admixtures, and using high grade concrete. The FRP system can also be used to increase the durability of the concrete structures under marine conditions, by preventing the ingress of chloride ions into the structures, thereby preventing the corrosion of the steel reinforcements. In addition, the FRP system has the additional function of increasing the strength of the structure. The FRP system, which composed of the epoxy developed and carbon fiber selected in our previous paper [7], was evaluated according to various standard testing methods to get the basic technical information of the FRP system. Concrete beams and columns were wrapped with the FRP system in different design and tested to verify the effectiveness of FPR wrapping. The results showed that the performance of concrete specimens wrapped with FRP system developed could be increased up to 6 times compared to control specimens without wrapping.
Authors: Na Lu
Abstract: Hemp fiber has recently captured a significant interest in the science and engineering community because of its high specific strength and stiffness with an environmentally friendly feature. This paper reports a systematic study relating a specific surface treatment on hemp fiber with respect to the flexural strengths of the treated hemp fiber reinforced recycled polymeric composites. The flexural strength, strain, and modulus of rupture of the composite were tested on a constant rate of extension testing machine following ASTM standards. Surface morphologies of fiber and fracture surfaces of the composites were also observed using the Scanning Electron Microscope (SEM) and Fourier Transfer Infrared Spectroscopy (FTIR) technique.
Authors: Mehmet Serkan Kirgiz
Abstract: This review research aims to discuss the results obtained researches on cement containing pure cement, pulverised fly ash, and nanoparticles, in order for eliminating negative side effects underlie the substitution of by–products for pure Portland cement. Nanoparticles (NP) used in these researches are nanoTiO2, nanoSiO2, nanoCaCO3, fibers of carbon nano tube (CNT), nanolimestone (nanoCaCO3), nanoZrO2, nanoclays, and nanometakaolin (nMK) for improving properties of cement systems. Published manuscripts explains two methods regarding on the usage of nanoparticles for cement system: blending and ultrasonication for dispersion of nanoparticles. However, differences between blending and ultrasonication methods suggested by various researchers are also discussed. Experiments reported these papers include the water demand, the density, the setting–times, the heat of hydration, the fluidity, the compressive strength and the flexural strength. According to these results, nanoparticles increase the water demand and heat of hydration of cement; it decreases the density and fluidity for cement mortars, evidently. The most effective nanoparticles on early compressive and flexural strengths are fibers of carbon nano tube and nanoCaCO3. These papers also point effects of these nanoparticles on the strength gain of cement. This review paper inform us until Effect of nanomaterial on water demand and density section in this Part I. Second part of this review paper will explain Hydration properties of Portland pulverised fly ash cement section, Effect of nanomaterial on setting–time section, Effect of nanomaterial on heat of hydration section, Strength gain mechanisms for hardened Portland pulverised fly ash cement paste and mortar section, Effect of nanomaterial on compressive strength section, Effect of nanomaterial on flexural strength (Bending) section, and Conclusion section.
Authors: Joon Seok Park, In Kyu Kang, Jong Hwa Park, Joo Kyung Park, Hong Taek Kim, Soon Jong Yoon
Abstract: In construction industries, new construction materials are needed to overcome some problems associated with the use of conventional construction materials due to the change of environmental and social requirements. Accordingly, the requirements to be satisfied in the design of civil engineering structures are diversified. As a new construction material in the civil engineering industries, fiber reinforced polymeric plastic (FRP) has a superior corrosion resistance, high specific strength/stiffness, etc. Therefore, such properties can be used to mitigate the problems associated with the use of conventional construction materials. Nowadays, new types of bridge piers and marine piles are being studied for new construction. They are made of concrete filled fiber reinforced polymeric plastic tubes (CFFT). In this paper, a new type of FRP-concrete composite pile which is composed of reinforced concrete filled FRP tube (RCFFT) is proposed to improve compressive strength as well as flexural strength of an RCFFT. The load carrying capacity of proposed RCFFT is discussed based on the result of experimental and analytical investigations.
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