مجله صنایع چوب و کاغذ ایران

مجله صنایع چوب و کاغذ ایران

تاثیر افزودن الیاف بازیافتی کارتن کنگره‌ای کهنه بر ویژگی‌های چندسازه الیاف - سیمان هوادهی شده

نوع مقاله : مقاله پژوهشی

نویسندگان
1 گروه علوم و صنایع چوب و کاغذ، دانشکده منابع طبیعی، دانشگاه تربیت مدرس
2 دانشیار دانشگاه تربیت مدرس
3 گروه صنایع چوب، دانشگاه تربیت دبیر شهید رجایی
چکیده
نگرانی‌های زیست محیطی، محققین را بَه سمت استفاده از فناوری‌های سبز سوق داده است. در این تحقیق امکان استفاده از الیاف بازیافتی کاغذ باطله و سیمان با کمک فرایند هوادهی به منظور تولید یک محصول ساختمانی سبز، سبک، با قابلیت گیرایی، دوام و ویژگی‌های مکانیکی مناسب پرداخته شده است. در این محصول با ایجاد فضاهای حاوی هوا (با پراکنش یکنواخت) توسط یک عامل کف کننده مناسب، ویژگی‌های مدنظر بررسی گردید. در این راستا الیاف بازیافتی در (بر اساس وزن خشک سیمان) به فوم بتن اضافه گردید. افزودن الیاف باعث افزایش زمان گیرایی اولیه و نهایی سیمان پرتلند به ترتیب به میزان 69- 15 درصدی و 53- 27 درصدی گردید. مقاومت فشاری محصول در میزان مصرف الیاف در سطوح 1، 5/1 و 2 درصد، بترتیب 08/2، 84/1 و 70/1 مگاپاسگال تعیین گردید که نشان از کاهشی بودن این مقاومت با افزایش میزان مصرف الیاف دارد. همچنین استفاده از الیاف بازیافتی در فوم بتن باعث بهبود مقاومت خمشی گردیده است؛ به طوری که بیشترین افزایش در سطح 1 درصد الیاف (نسبت به وزن سیمان) به میزان 02/1 مگاپاسکال بوده است. به علاوه، افزودن 1 درصد الیاف بازیافتی به فوم بتن باعث کاهش13 درصدی انقباض در فوم بتن نهایی گردید؛ درحالی‌که سطوح 5/1 و 2 درصد الیاف تفاوت معنی‌داری در انقباض ایجاد نکرده است.
کلیدواژه‌ها

موضوعات


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