5th Asia Conference on Mechanical and Materials Engineering

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Authors: Shu Huei Hsieh, Wen Jauh Chen
Abstract: Pure TiO2 nanoparticles, TiO2/9 wt %CNT and TiO2/18 wt %CNT nanocomposites were fabricated by sol-gel method and the CNTs in TiO2/CNT nanocomposite were grown under the catalysis of Ni film in thermally chemical deposition process. The TiO2/CNT was characterized and analyzed by field-emission scanning electron microscope, transmission electron microscope, and x-ray diffractometer. The results showed that the pure TiO2 nanoparticles have anatase form when calcination temperature T ≦ 500 °C, and partly become rutile form when T ≧ 550 °C. The CNTs embedded in TiO2 could retard the phase transformation of TiO2 from anatase into rutile. The grain sizes of anatase and rutile phases ranged from 10.1 to 27.7 nm and essentially increase with increase in calcinations temperature. The CNTs in composite could reduce the adsorption and the photocatalytic degradation of azo dye (AO7).
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Authors: Ponrawee Wanriko, Karoon Fangsuwannarak
Abstract: Biofuel modifications play a major role in a substitution for fossil fuel to be used in diesel engines and reducing exhaust emission. The most amounts of crude palm oil produced from Asian region can be an alternative fuel, sustainably. By the modifying crude palm oil into pure palm oil biodiesel (POB100), alkali trans-esterification procedure was operated. In the present, the high-quality POB products have been investigated considerably for alternative fuel in 4-cylinders high-speed diesel engine. The aim of this paper is to study in the improvement of POB quality by repeated-distillation and blending POB with nanoZnO additive. The high-speed engine combustion from consuming blended POB fuel were investigated the influences of exhaust emission under speed engine operation of 2,000 rpm and 3,000 rpm. The experimental results were shown that the POB fuel yielded at 84.54% from using 400 g. of raw materials. Both of redistilled POB and POB blended with nanoZnO additive showed the improvement of physical properties including viscosity, specific gravity and cetane number values being under ASTM standard values for high-speed engine. In addition, the results of exhaust emission from the engine showed the effective decrease of carbon monoxide (CO), carbon dioxide (CO2) around 13% due to using redistilled POB and POB blended nanoZnO additive compared with diesel fuel. Unburned hydrocarbon (HC) and nitric oxide (NOx) emissions of the diesel fuel condition. Therefore, this study suggests that nanoZnO blending POB in the small fraction about 0.005 wt% is able to provide the high potentiality for as a clean and alternative fuel.
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Authors: Adi Surya Pradipta, Wiwiek Eka Mulyani, Bambang Sunendar Purwasasmita
Abstract: Hydrophobic textile is a type of smart fabrics. Some of it are commonly coated with small particles and finally treated by water repellent agent in terms of acquiring its hydrophobic property. This research describes how hydrophobic textile are formed from its initial form of fabrics and even yarn, which are fibers. Synthesis process was commenced through wet spinning of viscose rayon mixed with nanorod silica which has been formerly produced with sol gel method. These fibers were then coated with chitosan and dried out by vacuum instrument. Scanning Electron Microscopy (SEM) results showed that nanorod silica were well attached on the fibers. Followed by Energy Dispersive Spectroscopy (EDS) mapping characterization, silica particles were moderately dispersed on its surface, performing roughness and creating hydrophobic effect. In addition, several characterization methods correlated to water absorption of the fibers were conducted. Fibers swelling percentage decreased from 50.2% to 17.13%, while moisture regain (MR) number also decreased from 14.28 to 10.72.
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Authors: Xin Guo, Wen Li, Xiong Li Huang, Dian Gang Zhai
Abstract: A new-type high performance cold-patch mixture was made from new-type cold-patch asphalt emulsion, which is able to promote the adhesive effect of asphalt and aggregate. This new mixture boasts advantages such as good workability and being free from bad weather like rain and low temperature. During the production, the evaluation method of cold-patch asphalt material was improved by the adoption of rotary viscosity test and paper trail test. Field tests were carried out on some sections of Linchang Expressway. When compared to existing repair materials, the new-type cold-patch mixture showed better repair effect as well as the potential for a wide range of promotion.
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Authors: Wen Li, Xin Guo, Pan Liu
Abstract: This research was based on indoor experiment to find out the performance of polymer modified cement matrix injecting paste material mixed with polyvinyl alcohol fiber. Results showed that polyvinyl alcohol fiber had a positive effect on the performance of polymer modified cement injecting paste material where the flexural and compressive strength of the injecting paste material were both increased evidently with a 6mm fiber while the fluidity of it changed little, and meanwhile the flexural and compressive strength of the injecting paste material could be largely increased with a 1.0% content of fiber.
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Authors: Jan Fořt, David Čítek, Milena Pavlíková, Zbyšek Pavlík
Abstract: High Performance Fiber Reinforced Concrete (HPFRC) became very popular material for its high mechanical strength, elastic modulus and corrosion resistance. However, also its high-temperature resistance is of a particular importance because of the fire safety. Therefore, the effect of high-temperature exposure on UHPC reinforced by combination of steel and PVA fibers was studied in the paper. PVA fibers were used to moderate concrete damage induced by water vapor evaporation from dense UHPC matrix. The UHPFRC samples were exposed to the temperatures of 200 °C, 400 °C, 600 °C, 800 °C, and 1 000 °C respectively. Concrete structural changes induced by high temperature action were described by the measurement of basic physical and mechanical properties. The realized experiments provide information on the changes of concrete porosity and loss of mechanical resistivity.
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Authors: Trong Phuoc Huynh, Chao Lung Hwang
Abstract: The present study aims to investigate the engineering properties of foam lightweight material (FLM) that was produced using a mixture of ordinary Portland cement (OPC) and limestone powder (LP). The FLM samples were prepared with various proportions of LP (10%, 20%, and 30%) and different percentages of foam (9%, 12%, and 15%). Properties of the FLM were evaluated through the values of compressive strength, dry density, porosity, and thermal conductivity. Test results show that the foam contents affected all properties of the FLM significantly, whereas LP contents showed the insignificant effect to the FLM properties. Furthermore, the results of the present study showed a close correlation between porosity and other properties of the FLM as higher porosity resulted in lower density and thus lower thermal conductivity and mechanical strength.
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Authors: Lucie Zemanová, Jaroslav Pokorný, Milena Pavlíková, Zbyšek Pavlík
Abstract: This paper deals with determination of basic physical, mechanical, thermal and water transport properties of lime–based plasters whose composition was modified by the addition of diatomaceous earth. To eliminate possible deterioration of original lime plaster by natural weathering, the hydrophobic admixtures on the stearate and oleate basis were added into the plaster mixtures and boiled linseed oil as a painting was applied. All studied material parameters were tested after 28 days of wet curing and after exposition to accelerated carbonation. The results of examined properties of developed plasters gave promising outcomes for the use of hydrophobised materials in renewal of historical buildings. Based on the obtained data, plaster made of lime hydrate, diatomite, and combination of water repellent agents can be recommended for renovation purposes.
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Authors: Bao Lei Du, Qi Fei Jian
Abstract: The atomic stress tensor at a given continuum point is a spatial average value of some volume near the point. Recent progresses in multiscale modeling include the dealing of the optimal number and the size of these volumes. In this paper, we motivate the application of Iterative self-organizing data analysis technique algorithm to estimate volume numbers. The size of these space averaging volumes then could be got using Gaussian mixture model. Reduced computation complexity is offered by this method. Atomistic simulations are conducted to analyze the stress of a stone-wales defect graphene sheet to validate the method. Other multiscale values could also be determined using this method.
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Authors: Takehito Ikeuchi, Akihiro Koyama, Muneyuki Imafuku, Shun Fujieda, Yusuke Onuki, Shigeru Suzuki
Abstract: We carried out in situ tri-axial magnetostriction analysis for cube-oriented Fe-18%Ga single crystal by X-ray diffraction measurement under magnetic field. Periodic change in tri-axial magnetostriction with applied magnetic field direction was clearly observed. However, those values in [100] and [010] directions were not equivalent. Theoretical calculation of magnetostriction considering domain structure revealed this is caused by the non-equivalent volume fraction of initial magnetic domains.
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