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Rahim Yadollahi Yahya Hamzeh Alireza Ashori Shademan Pourmousa Mohammad Jafari Kambiz Rashedi 《Polymer Engineering and Science》2013,53(1):183-188
Papermaking sludge (PS), a waste residue from the pulp and paper processing, has brought great pressure on the environment because of large quantities that are produced in paper mills. This work was carried out to explore the possibility of making PS/cement composite products using solid waste of PS. Boards measuring 350 × 270 × 12 mm3 were manufactured using PS contents of 40, 50, and 60 wt%, adhesive dosages of 0, 10, and 15 wt%, and 0 and 5 wt% of calcium chloride as an accelerator. At least three replications were fabricated for each treatment, and some mechanical and physical properties of the boards were evaluated. Test results showed that the bending and internal strengths of the specimens decreased with an increase in the PS content, and the maximum values were obtained at PS loading of 40 wt%. The negative influence of PS content on the mechanical properties can be explained by the reduced bonding ability because of weaker PS compared with cement. Screw withdrawal values were up to 22.7 kPa. Water absorption and thickness swelling of cement mortar considerably increased with increased content of PS, with a corresponding reduction of bulk density. In general, all properties of the boards were improved when the adhesive and calcium chloride contents were increased. The results showed that an increase in board density improved the mechanical and physical properties. Finally, results showed that PS has good potential for recycling and utilization in developing value‐added building components. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers 相似文献
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A. Pourmousa J. Mostaghimi A. Abedini S. Chandra 《Journal of Thermal Spray Technology》2005,14(4):502-510
The size and velocity of particles produced by a ValuArc 200 (Sulzer-Metco, Westbury, NY) twin-wire-arc spraying system were
measured in-flight using a DPV-2000 system (Tecnar Ltd., St-Bruno, QC, Canada) for a range of operating parameters. A technique
was developed to identify and separate the size distributions of particles produced by atomization of molten metal at either
the anode or the cathode by assuming that both follow a log-normal distribution. It was shown that particles produced by the
anode are almost two times larger in diameter than those originating from the cathode. Experiments showed that increasing
the pressure of atomizing gas decreased the size of both anodic and cathodic particles, but changing wire feed rate and operating
voltage did not change particle size significantly. 相似文献
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E. Lin H. B. Parizi A. Pourmousa S. Chandra J. Mostaghimi 《Journal of Coatings Technology and Research》2011,8(6):697-706
Applying a thin, protective coating of a nontoxic, chemically resistant epoxy to the interior of existing pipes is an alternative
method to pipe replacement. In order to find the controlling parameters in this method, in this study, viscous epoxy was propelled
by compressed air through clear polyvinyl chloride (PVC) pipes. Epoxy flow was annular, and it hardened to form a thin, uniform
coating on the inner pipe surface. A video camera was employed to record fluid motion, and the thickness of the coating was
measured using an image analysis program named ImagJ. Tests were done with varying air temperature, airflow rate, piping configuration,
and epoxy temperature. A one-dimensional numerical algorithm was developed to model fluid flow, heat transfer, and epoxy curing.
Heating the epoxy makes it move faster because liquid viscosity decreases with increasing temperature. The coating was significantly
thicker at the bottom of a horizontal pipe than at the top due to sagging of the epoxy coating after it had been applied,
resulting in flow from the top to the bottom of the pipe. Sagging could be reduced by maintaining airflow until curing was
almost complete and the epoxy had hardened enough to prevent it from moving easily. The combination of the experimental results
and numerical modeling showed that the most important parameters controlling the speed of the epoxy and coating thickness
were the air flow rate and temperature, since they determine the shear forces on the epoxy layer and the rate at which the
epoxy cures. Raising air temperature increases the reaction rate and therefore decreases the time required for the epoxy to
cure inside the pipe. The results of the simulation showed a very good agreement with the experimental results in pipes with
1-in diameter or less. 相似文献
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Ghorbanpour Arani Ali BabaAkbar-Zarei Hassan Pourmousa Pouya Eskandari Masume 《Microsystem Technologies》2018,24(7):3045-3060
Microsystem Technologies - In this paper, free vibration analysis of sandwich composite micro-beam (SCMB) subjected to multi physical fields is investigated using the sinusoidal shear deformation... 相似文献
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