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تقویت ریزساختار کامپوزیت چوب گچ با کربنات کلسیم اصلاح‌شده، سولفانات و نشاسته به‌منظور کاهش جذب آب و افزایش مقاومت مکانیکی | ||
| نشریه جنگل و فرآورده های چوب | ||
| دوره 76، شماره 4، اسفند 1402، صفحه 341-353 اصل مقاله (1.46 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/jfwp.2024.367884.1267 | ||
| نویسندگان | ||
| سیده راحیل چالاک* 1؛ سعید رضا فرخ پیام1؛ علی بیات کشکولی1؛ حسینعلی رهدار2 | ||
| 1گروه صنایع چوب و کاغذ، دانشکدة منابع طبیعی، دانشگاه زابل، زابل، ایران. | ||
| 2گروه مهندسی عمران-سازه، دانشکدة فنی و مهندسی، دانشگاه زابل، زابل، ایران. | ||
| چکیده | ||
| این تحقیق جهت سبک‌سازی، مقاوم‌سازی چوب گچ به‌همراه کم‌کردن تمایل آن به جذب آب انجام شده است. بدین‌منظور، ابتدا اثر متغیر الیاف رنگبری نشده و سپس اثر متغیرهای کربنات کلسیم اصلاح‌شده با اسید استئاریک، لیگنوسولفانات، پلی‌ونیل الکل، نشاستة ذرت و تاپیوکا بر روی مقاومت خمشی نمونه ها بررسی شد. این مواد افزودنی در سطوح مختلف به گچ اضافه شد تا مقدار بهینه جهت بهبود خصوصیات تخته گچ از جمله مقاومت خمشی با آزمون و خطا به‌دست آید. مقاومت فشاری، جذب آب، چگالی و ریز ساختار نمونه های تیمارهای بهینه بررسی شد. نتایج نشان داد اسید استئاریک، یک‌لایة پوششی بر ذرات کربنات کلسیم ایجاد و دسترسی رطوبت را تا حدود 1/1 برابر در الیاف رنگبری نشده نسبت به نمونه های شاهد به حداقل میرساند. مقاومت فشاری در کلیة تیمارهای خمیر رنگبری نشده نسبت به نمونه های شاهد افزایش داشت و این افزایش در نشاسته تاپیوکا مشهودتر بود و نسبت به نمونه های شاهد 2/3 برابر شد. در نهایت، تصاویر میکروسکوپ الکترونی توزیع یکنواخت الیاف و بلورهای گچ و در نتیجه بافت همگن و اتصال مناسب بین آن‌ها را نشان داد. حتی با توجه به اینکه نمونه های تیمارهای بهینه در رده چگالی کم (0/74 گرم بر سانتی‌متر مکعب) قرار گرفتند، ولی مقاومت فشاری بیشتری نسبت به حداقل مقدار استاندارد داشتند. تخته گچ های تولید شده دارای حداقل مقاومت استاندارد و جذب آب مناسبی می باشند. | ||
| کلیدواژه‌ها | ||
| تخته گچ؛ ساختار میکروسکپی؛ لیگنوسولفانات؛ مقاومت فشاری | ||
| عنوان مقاله [English] | ||
| Reinforcement of the microstructure of gypsum board composite with modified calcium carbonate, sulfonate, and starch to reduce water absorption and increase mechanical strength | ||
| نویسندگان [English] | ||
| Sydeh Rahil Chalak1؛ Saeedreza Farrokh Payam1؛ Ali Bayatkashkoli1؛ Hosseinali Rahdar2 | ||
| 1Department of Wood and Paper Industries, Faculty of Natural Resources, University of Zabol, Zabol Iran. | ||
| 2Department of Civil-Structural Engineering, Faculty of Technical and Engineering, University of Zabol, Zabol, Iran. | ||
| چکیده [English] | ||
| This research was conducted to enhance the strength and reduce the water absorption of gypsum board. Initially, the effect of unbleached fiber was examined, followed by an investigation into the impact of calcium carbonate modified with stearic acid, lignosulfonate, polyvinyl alcohol, corn starch, and tapioca on the flexural strength of the samples. These additives were incorporated into the plaster at varying levels to determine the most effective amount for improving the properties of the gypsum board, including bending strength, through trial and error. The compressive strength, water absorption, density, and microstructure of samples from optimal treatments were analyzed. The results revealed that stearic acid formed a coating layer on the calcium carbonate particles, reducing moisture absorption to approximately 1.1 times that of untreated fibers compared to the control samples. Furthermore, the compressive strength increased in all treatments with unbleached pulp compared to the control samples, with tapioca starch showing the most significant increase at 2.3 times that of the control samples. Electron microscope images displayed a uniform distribution of gypsum fibers and crystals, resulting in a homogeneous texture and proper connection between them. Despite falling into the low-density category (0.74 g/cm3), the optimal treatment samples exhibited higher compressive strength than the minimum standard value. The produced gypsum boards demonstrated standard resistance and appropriate water absorption. | ||
| کلیدواژه‌ها [English] | ||
| Compression strength, Gypsum board, Ligno sulfanate Mecroscopic texture | ||
| مراجع | ||
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آمار تعداد مشاهده مقاله: 41 تعداد دریافت فایل اصل مقاله: 68 |
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