مهندسی سازه و ساخت

مهندسی سازه و ساخت

مروری بر معرفی روش‌های اصلاح سطح پلاستیک‌ بازیافتی جهت افزایش عملکرد بتن‌های الیافی

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دانشجوی کارشناسی ارشد، گروه ساختمان، دانشکده معماری و شهرسازی، دانشگاه شهید بهشتی تهران، ایران
2 استادیار گروه سازه و زلزله، دانشکده مهندسی عمران،آب و محیط زیست، دانشگاه شهید بهشتی، تهران، ایران
3 دانشیار، 'گروه ساختمان،دانشکده معماری و شهرسازی، دانشگاه شهید بهشتی تهران، ایران
چکیده
با افزایش بی‌سابقه تولید زباله‌های پلاستیکی و نیاز فزاینده به توسعه مصالح پایدار در صنعت ساخت‌وساز، استفاده از بتن حاوی پلاستیک بازیافتی به یکی از حوزه‌های پرطرفدار در تحقیقات علمی تبدیل شده است. این نوع بتن می‌تواند به کاهش ضایعات پلاستیکی کمک کرده و هم‌زمان ویژگی‌های پایداری را به صنعت ساخت‌وساز اضافه کند. با این حال، چالش اصلی در بتن حاوی پلاستیک، ضعف چسبندگی ذرات پلاستیک به ماتریس سیمانی است که می‌تواند موجب کاهش خواص مکانیکی بتن و حتی تضعیف طول عمر آن شود. در این پژوهش، تأثیر تیمار پلاسما به عنوان روشی نوین و کارآمد برای اصلاح سطح الیاف بازیافتی پلی‌اتیلن ترفتالات (PET) مورد بررسی قرار گرفته است تا بتواند چسبندگی و تقویت خواص مکانیکی بتن را بهبود بخشد. تیمار پلاسما از طریق ایجاد تغییرات سطحی بر روی الیاف PET، ویژگی‌های آبدوستی و چسبندگی این الیاف را به ماتریس سیمانی افزایش می‌دهد و بدین ترتیب موجب بهبود چسبندگی و پیوند بین اجزای بتن می‌شود. این بهبود به‌ویژه در ناحیه انتقال بین سطحی که مستعد ترک‌خوردگی است، قابل‌مشاهده بوده و می‌تواند منجر به افزایش مقاومت فشاری و کششی بتن گردد. نتایج حاصل از آزمایش‌های مختلف، شامل تست‌های فشاری، کششی و خمشی، و همچنین بررسی دوام بتن در برابر شرایط چرخه‌های یخ‌زدگی و ذوب، بهبود قابل‌توجه عملکرد بتن‌های حاوی الیاف ‌تیمار‌دیده را به‌طور واضح نشان می‌دهد. اگرچه نتایج اولیه تیمار پلاسما امیدوارکننده بوده و افزایش چشمگیری در خواص مکانیکی بتن نشان می‌دهد، این روش همچنان نیازمند انجام تحقیقات بیشتر برای بهینه‌سازی پارامترهای فرآیند و ارزیابی دقیق آن در مقیاس‌های صنعتی است. در نهایت، این پژوهش نشان می‌دهد که تیمار پلاسما با ارتقای پایداری بتن‌های حاوی PET می‌تواند به کاهش اثرات زیست‌محیطی ناشی از تولید بتن کمک کرده و گامی مؤثر در جهت توسعه مصالح سازگار با محیط زیست باشد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

A review of methods for surface modification of recycled plastic to enhance the performance of fiber-reinforced concrete

نویسندگان English

Ali Saadati 1
Kianoosh Samimi 2
Mohammadreza Hafezi 3
1 Masters student, Faculty of Architecture and Urban planning, Shahid Beheshti University, Tehran, Iran.
2 Assistant Professor, Faculty of Civil, Water and Environmental Engineering, Shahid Beheshti University, Tehran, Iran.
3 Associate Professor, Faculty of Architecture and Urban planning, Shahid Beheshti University, Tehran, Iran.
چکیده English

With the unprecedented increase in plastic waste production and the growing demand for the development of sustainable materials in the construction industry, the use of concrete containing recycled plastic has become a highly popular area of scientific research. This type of concrete can help reduce plastic waste while simultaneously adding sustainability features to the construction sector. However, the main challenge in plastic-containing concrete is the weak adhesion of plastic particles to the cement matrix, which can reduce the mechanical properties of concrete and even weaken its longevity. This study investigates the effect of plasma treatment as an innovative and efficient method for surface modification of recycled polyethylene terephthalate (PET) fibers to improve adhesion and enhance the mechanical properties of concrete. Plasma treatment, by inducing surface modifications on PET fibers, increases the hydrophilicity and adhesion of these fibers to the cement matrix, thereby improving the bond and adhesion between concrete components. This improvement is particularly evident in the interfacial transition zone, which is prone to cracking, and can lead to enhanced compressive and tensile strength of the concrete. The results of various experiments, including compressive, tensile, and flexural strength tests, as well as evaluations of the concrete's durability against freeze-thaw cycles, clearly demonstrate the significant performance improvement of concrete containing plasma-treated fibers. Although the initial results of plasma treatment are promising and show a substantial increase in the mechanical properties of concrete, further research is required to optimize the process parameters and thoroughly assess its application on an industrial scale. Ultimately, this study suggests that plasma treatment, by improving the sustainability of PET-containing concrete, can contribute to reducing the environmental impact of concrete production and represent an effective step toward the development of environmentally friendly construction materials.

کلیدواژه‌ها English

Recycled Concrete
Plasma
Plastic Fibers
Interfacial Transition Zone
Surface Modification
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  • تاریخ دریافت 15 آذر 1403
  • تاریخ بازنگری 13 اسفند 1403
  • تاریخ پذیرش 16 اردیبهشت 1404