پژوهشنامه حمل و نقل

پژوهشنامه حمل و نقل

بررسی تأثیر کوپلیمر زیستی آکریلاتی بر دوام و مقاومت فشاری کف‌پوش‌ ماسه‌ای تحت چرخه‌های محیطی

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشجوی دکتری، دانشکده مهندسی عمران، دانشگاه یزد، یزد، ایران
2 دانشیار، دانشکده مهندسی عمران، دانشگاه یزد، یزد، ایران
چکیده
امروزه مشکلات محیط زیستی به یک معضل جهانی تبدیل‌شده است؛ ازاین‌جهت به‌کارگیری مصالح دوستدار محیط‌زیست همچون بلوک‌ها و کف‌پوش‌های خاکی در صنعت ساخت‌وساز اهمیت ویژه‌ای پیداکرده است. ازاین‌رو این پژوهش به بررسی اثرات تثبیت بلوک‌های خاکی ماسه‌بادی با استفاده از کوپلیمر آکریلاتی امولسیونی، یک پلیمر دوستدار محیط‌زیست، بر دوام آن‌ها می‌پردازد. در این راستا، نمونه‌های بلوک خاکی با درصدهای مختلف پلیمر (۵ تا ۲۰ درصد) تهیه‌شده و تحت آزمایش‌های مقاومت فشاری، جذب آب، جذب مویینگی، چرخه تر و خشک، و چرخه ذوب و یخ قرار گرفتند. همچنین تأثیر دانه‌بندی‌های مختلف بر مقاومت فشاری این بلوک‌ها موردبررسی قرار گرفت. نتایج نشان داد که افزایش مقدار پلیمر منجر به افزایش مقاومت فشاری اولیه و کاهش افت مقاومت در طول آزمایش‌های دوام می‌گردد. به‌طور خاص، با افزایش پلیمر از ۵ به ۲۰ درصد، افت وزنی بلوک‌ها در اثر چرخه‌های تر و خشک و ذوب و یخ به ترتیب به یک‌دهم و یک‌هشتم کاهش یافت. تحلیل‌های آماری t-test نشان داد که افت مقاومت ناشی از چرخه‌های دوام، اگرچه وجود دارد، اما ازنظر آماری قابل‌ملاحظه نیست. همچنین، افزایش پلیمر به‌طور چشمگیری جذب آب و مویینگی را کاهش داد. معادلات رگرسیونی ارائه‌شده، امکان پیش‌بینی پارامترهای دوام بلوک‌های پلیمری را با توجه به غلظت و درصد پلیمر فراهم می‌سازند. این پژوهش رابطه‌ای مستقیم بین درصد جذب آب و ضریب مویینگی با افت وزنی در اثر چرخه‌های دوام را مشخص نمود. این یافته‌ها نشان می‌دهند که استفاده از کوپلیمر آکریلاتی می‌تواند به‌طور مؤثری دوام بلوک‌های خاکی را در برابر عوامل محیطی افزایش دهد. همچنین نتایج نشانگر آن است که نوع دانه‌بندی تأثیر بسزایی بر مقاومت فشاری دارد؛ به‌طوری‌که با ریزتر شدن دانه‌بندی مقاومت فشاری بلوک‌ها حدود ۳ برابر افزایش‌یافته است.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Investigation of the Effect of Bio-Based Acrylate Copolymer on the Durability and Compressive Strength of Sand-Based Pavement under Environmental Cycles

نویسندگان English

Zohreh Ghafori fard 1
Maryam Mokhtari 2
Mohamad Mehdi Khabiri 2
Seyed Mehrdad Jalilian 2
1 Ph.D., Student, Engineering Faculty, Yazd University, Yazd, Iran.
2 Associate Professor, Engineering Faculty, Yazd University, Yazd, Iran.
چکیده English

Today, environmental problems have become a global concern; thus, the use of eco-friendly materials such as soil blocks and pavements has gained special importance in the construction industry. Accordingly, this study investigates the effects of stabilizing sandy soil blocks using AS emulsion acrylate copolymer, an environmentally friendly polymer, on their durability. For this purpose, soil block samples with different polymer percentages (5% to 20%) were prepared and subjected to compressive strength, water absorption, capillary absorption, wet-dry cycle, and freeze-thaw cycle tests. Additionally, the impact of different grain size distributions on the compressive strength of these blocks was examined. The results showed that increasing the polymer content led to an increase in initial compressive strength and a reduction in strength loss during durability tests. Specifically, increasing the polymer content from 5% to 20% reduced the weight loss of the blocks due to wet-dry and freeze-thaw cycles by one-tenth and one-eighth, respectively. Statistical t-test analyses indicated that although there is strength loss due to durability cycles, it is not statistically significant. Moreover, increasing the polymer content significantly reduced water absorption and capillary action. The provided regression equations enable the prediction of the durability parameters of polymer-stabilized blocks based on polymer concentration and percentage. This study identified a direct relationship between water absorption rate, capillary coefficient, and weight loss due to durability cycles. These findings demonstrate that using the AS copolymer can effectively enhance the durability of soil blocks against environmental factors. The results also indicate that the grain size distribution has a significant effect on compressive strength: finer grain sizes increased the compressive strength of the blocks by approximately three times.

کلیدواژه‌ها English

Bio-Based Acrylate Copolymer
Durability of Polymer Blocks
Eco-Friendly Pavement
Wet-Dry Cycles
Compressive Strength
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