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اثر دانسیته و نسبت اختلاط خرده‌چوب صنعتی به سیمان بر خواص مکانیکی و فیزیکی چندسازه چوب سیمان | ||
| تحقیقات علوم چوب و کاغذ ایران | ||
| مقاله 5، دوره 35، شماره 4 - شماره پیاپی 73، دی 1399، صفحه 362-375 اصل مقاله (514.65 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijwpr.2021.351532.1630 | ||
| نویسندگان | ||
| محمد غفرانی* 1؛ انوشه فاضلی2 | ||
| 1استاد، گروه علوم و صنایع چوب و کاغذ، دانشکده مهندسی مواد و فناوری‌های نوین، دانشگاه تربیت دبیر شهید رجایی تهران، ایران، | ||
| 2گروه تکنولوژی و مهندسی چوب، دانشکده مهندسی چوب و کاغذ، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران | ||
| چکیده | ||
| در پژوهش حاضر اثر دانسیته اسمی در دو سطح 800 و 1100 کیلوگرم بر متر مکعب و نسبت اختلاط خرده‌چوب صنعتی به سیمان در دو سطح 25% به 75% و 35% به 65% بر خواص مکانیکی و فیزیکی چندسازه چوب سیمان بررسی شد. پس از ساخت چندسازه‌ها، مقادیر دانسیته واقعی محاسبه شد. مدول الاستیسیته و مقاومت خمشی تخته‌ها مطابق با استاندارد EN 310، چسبندگی داخلی مطابق با استاندارد EN 319، جذب آب و واکشیدگی ضخامت پس از 2 و 24 ساعت غوطه‌وری، برابر استاندارد EN 317 و مقاومت به آتش طبق استاندارد ISO 11925 اندازه‌گیری شد. نتایج نشان داد با افزایش دانسیته، خواص خمشی شامل مدول الاستیسیته و مدول گسیختگی و همچنین مقاومت چسبندگی داخلی نمونه‌ها در اثر افزایش فشردگی و سطح تماس کافی بین الیاف و ماتریس سیمان بهبود یافت. با افزایش نسبت سیمان، مدول الاستیسیته نمونه‌ها افزایش معنی‌داری یافت. مدول گسیختگی به طور معکوس با افزایش نسبت سیمان تغییر کرد. افزایش نسبت اختلاط چوب به سیمان، منجر به پوشش ناکافی ذرات چوب توسط سیمان و کاهش مقاومت در برابر نیروهای کششی اعمال شده در آزمون چسبندگی داخلی شد. با افزایش دانسیته، ثبات ابعاد نمونه‌ها افزایش یافت. تغییر در نسبت اختلاط چوب به سیمان، اثر معنی‌داری بر ثبات ابعاد نمونه‌ها داشت؛ به طوری که افزایش نسبت اختلاط چوب به سیمان، موجب افزایش جذب آب و واکشیدگی ضخامت نمونه‌ها شد. مقاومت به آتش نمونه‌ها با افزایش دانسیته و افزایش نسبت سیمان، افزایش یافت. ویژگی‌های مکانیکی چندسازه‌های چوب سیمان ساخته شده در این پژوهش، با مقادیر قید شده در استاندارد EN 634-2 مطابقت داشت. | ||
| کلیدواژه‌ها | ||
| چندسازه چوب سیمان؛ خواص خمشی؛ چسبندگی داخلی؛ ثبات ابعاد | ||
| عنوان مقاله [English] | ||
| Effect of density and industrial wood particles to cement ratio on mechanical and physical properties of wood cement composites | ||
| نویسندگان [English] | ||
| mohammad ghofrani1؛ Anooshe Fazeli2 | ||
| 1Professor, Department of Wood and Paper Sciences and Technology, Faculty of Materials Engineering and New Technologies, Shahid Rajaee Teacher Training University, Tehran, Iran | ||
| 2Dept., of Wood Technology and Engineering, Faculty of Wood and Paper Engineering, Gorgan University of Agricultural Sciences and Natural Resources | ||
| چکیده [English] | ||
| This study was carried out to investigate the effect of two nominal density levels of 800 kg/m3 and 1100 kg/m3 and two levels of industrial wood to cement ratios of 25:75 and 35:65 on mechanical and physical properties of wood cement composites. Boards were produced and then observed density of boards were calculated. The experimental boards were subjected to modulus of elasticity and modulus of rupture tests in accordance with EN 310. Internal bonding was evaluated according to EN 319. Water absorption and thickness swelling were evaluated after 2 and 24 hours immersion in water according to EN 317. Fire resistance was evaluated according to ISO 11925. Results indicated that bending properties of the boards, including modulus of elasticity and modulus of rupture, and internal bonding all increased with increase in density. That was attributed to the high compression and improved connection between fiber and cement matrix. Modulus of elasticity increased significantly as cement content was raised. Modulus of rupture values were inversely related to cement content. Increasing wood to cement ratio led to low internal bonding because the low amount of cement can be insufficient to cover the wood particles for effective bonding to resist the tensile forces applied during internal bonding test. As the board density increased, dimensional stability increased. Variations in the wood to cement ratio have been reported to significantly affect the dimensional stability of specimens. Water absorption and thickness swelling increased with the increase in wood to cement ratio. Fire resistance of specimens improved when the board density and cement content increased. All of the mechanical properties of boards produced in this study satisfied the EN 634-2 requirements. | ||
| کلیدواژه‌ها [English] | ||
| Wood cement composites, Bending properties, Internal bonding, Dimensional stability | ||
| مراجع | ||
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