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بررسی تقویت الوار تراشه موازی (PSL) حاصل از ضایعات نی و الوار روکش لایهای (LVL) ساخته شده از صنوبر با پلیمر تقویتشده با الیاف (FRP) | ||
| تحقیقات علوم چوب و کاغذ ایران | ||
| مقاله 4، دوره 39، شماره 2 - شماره پیاپی 87، تیر 1403، صفحه 95-110 اصل مقاله (995.33 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijwpr.2024.363404.1761 | ||
| نویسندگان | ||
| حانیه شوروزی* 1؛ محمد شمسیان2؛ علی بیات کشکولی3؛ محمد دهمرده قلعه نو2 | ||
| 1دانشجوی مقطع دکتری کامپوزیتهای لیگنوسلولزی و نویسنده مسئول، دانشگاه زابل، ایران | ||
| 2دانشیار، گروه صنایع چوب و کاغذ، دانشکده منابع طبیعی، زابل، ایران | ||
| 3استاد، گروه صنایع چوب و کاغذ، دانشکده منابع طبیعی، زابل، ایران | ||
| چکیده | ||
| سابقه و هدف: این مطالعه با هدف بررسی الوار تراشه موازی (PSL) ساخته شده از ضایعات نی و الوار روکش لایهای (LVL) حاصل از چوب صنوبر با پلیمر تقویتشده با الیاف شیشه (FRP) و رزین اپوکسی انجام شده است. مواد و روشها: متغیرمستقل الیاف GFRP در LVL و PSL و مقایسه آنها با حالت عدم استفاده از GFRP بود. ویژگیهای مکانیکی تختههای ساختهشده شامل مقاومت خمشی (MOR) و مدولالاستیسیته (MOE) در پهنا و لبه نمونه آزمونی، مقاومت برشی، مقاومت فشاری موازی با الیاف، مقاومت فشاری عمود بر الیاف، چسبندگی داخلی و مقاومت نگهداری پیچ بهعنوان متغیرهای وابسته بررسی شدند. نتایج بهدستآمده در قالب طرح کاملاً تصادفی توسط نرمافزار SPSS)) مورد تجزیهوتحلیل قرار گرفت. نتایج: نشان داد در همه ویژگیهای مکانیکی مورد مطالعه، استفاده از GFRP موجب تقویت ویژگیهای مکانیکی در پانلهای PSL و LVL گردید. برای LVL اثر تقویت نمونهها با GFRP برای مدول گسیختگی در سطح یک درصد معنی دارشد و MOR برای پهنا و لبه نمونههای آزمونی به ترتیب افزایش 93% و 59% را نشان داد. مقدار MOE در هنگام تقویت با GFRP برای پهنا و لبه نمونههای آزمونی PSL به ترتیب افزایش 6/89 و 132 درصدی را نشان داد. برای LVL، مقدار MOE پهنا و لبه نمونه آزمونی پس از تقویت افزایش 54 و 5/95 درصدی داشته است. تقویت نمونههای آزمونی PSL موجب بهبود مقاومت برشی آنها به میزان 31 درصد شده است حالآنکه این مقدار برای LVL تنها 5/2 درصداست. در آزمون چسبندگی داخلی تقویت با GFRP موجب بهبودی 92 درصدی مقاومت چسبندگی داخلی نمونهها شد. مقاومت نگهداری پیچ در اثر تقویت نمونههای آزمونی با GFRP تا 27 درصد بهبود یافت. نتیجهگیری: با توجه به نتایج به دست آمده میتوان اظهار داشت که استفاده از الیاف شیشه و رزین اپوکسی به نحو چشمگیری بر مقاومتهای مکانیکی تخته تراشه ساخته شده از نی و تخته الوار لایهای تأثیر مثبت داشته و امکان بهرهگیری از مواد اولیه نهچندان مرغوب نظیر نی و ضایعات لایههای چوبی صنوبر را فراهم آورده است. | ||
| کلیدواژهها | ||
| الوار تراشه موازی (PSL)؛ الوار روکش لایه (LVL)؛ پلیمر تقویتشده با الیاف شیشه و رزین اپوکسی (FRP) ویژگیهای مکانیکی | ||
| عنوان مقاله [English] | ||
| Investigating the reinforcement of parallel chip lumber (PSL) obtained from reed waste and laminated veneer lumber (LVL) made of spruce with fiber reinforced polymer (FRP) | ||
| نویسندگان [English] | ||
| Haniye Shurvazi1؛ Mohammad Shamsian2؛ Ali Bayatkashkoli3؛ Mohammad Dahmardeh Ghaleno2 | ||
| 1Ph.D. Student in Lignocellulosic Composites, Zabol University, Iran | ||
| 2Associate Professor in Science & Wood Industry & Paper Group, Zabol University, Zabol, Iran | ||
| 3professor, in Science & Wood Industry & Paper Group, Zabol University, zabol, Iran | ||
| چکیده [English] | ||
| Background and purpose: This study was conducted with the aim of investigating parallel strand lumber (PSL) made from reed waste and laminated veneer lumber (LVL) obtained from poplar wood that reinforced with glass fiber reinforced polymer (FRP) and epoxy resin. Materials and methods: The independent variable was LVL and PSL with FRP and their comparison control sample without FRP. The mechanical properties of the manufactured boards including bending strength (MOR) and modulus of elasticity (MOE) in the width and edge of the test sample, shear strength, compression strength parallel to the grain, internal bonding and Screw Withdrawal Strengths were investigated as dependent variables. The obtained results were analyzed in the form of completely randomized design by SPSS software. Results: Results showed that of all of the studied mechanical properties, the use of FRP strengthened the PSL and LVL panels. For LVL, the effect of strengthening the samples with FRP was significant at the level of 1% and also for the modulus of rupture of the width and edge samples showed an increase of 93% and 59%, respectively. The value of MOE during reinforcement with FRP showed an increase of 89.6 and 132% for the width and length of the PSL samples, respectively. For LVL, the MOE value of the width and edge of the samples increased by 54 and 95.5% with reinforcement. Reinforced PSL samples have improved their shear strength by 31%, while this value is only 2.5% for LVL. in the internal bonding test, strengthening with FRP improved the internal bonding strength of the samples by 92%. Screw Withdrawal Strengths improved by 27% due to the strengthening of the test samples with FRP. Conclusion: According to the obtained results, it can be stated that the use of glass fibers and epoxy resin has a significant positive effect on the mechanical resistance of PSL made of reed and LVL and it is possible to use low quality raw materials such as reed and waste poplar wood layers. | ||
| کلیدواژهها [English] | ||
| parallel strand lumber (PSL), laminated veneer lumber (LVL), polymer reinforced with glass fibers and epoxy resin (FRP), mechanical properties | ||
| مراجع | ||
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