ارزیابی آزمایشگاهی عملکرد مکانیکی و دوام کامپوزیت سیمانی مهندسی شده با الیاف فولادی و پلی‌وینیل الکل برای کاربرد در روکش‌های ترمیمی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری گروه عمران، واحد اراک، دانشگاه آزاد اسلامی

2 مرکز تحقیقات راه، مسکن و شهرسازی

3 واحد اراک، دانشگاه آزاد اسلامی

4 ، واحد اراک، دانشگاه آزاد اسلامی

5 گروه مهندسی نساجی، واحد اراک، دانشگاه آزاد اسلامی

10.22124/jcr.2025.30520.1699

چکیده

در این مقاله، اثرات الیاف فولادی قلابدار و پلی‌وینیل‌الکل بر خواص مکانیکی (مقاومت فشاری، خمشی، کششی، مدول الاستیسیته) و دوام (نفوذ تحت فشار آب، جذب آب نیم ساعت و 24 ساعت، مقاومت سایشی، نفوذ تسریع شده یون کلراید، مقاومت الکتریکی، پوسته‌شدگی در اثر چرخه‌ای یخ زدن و آب شدن) کامپوزیتهای سیمانی مهندسی شده به منظور کاربرد به عنوان مصالح ترمیمی رویه‌های بتنی از طریق مطالعات آزمایشگاهی مورد بررسی قرار گرفته است. نتایج نشان داد مقاومت فشاری 7 روزه، مقاومت کششی شکافتی و مدول الاستیسیته مخلوط حاوی 30 کیلوگرم الیاف فولادی (1.5 %) بیشترین بهبود به نسبت مخلوط فاقد الیاف به ترتیب با 40، 13 و 24 درصد افزایش داشت. مقاومت خمشی و جذب انرژی مخلوط حاوی 1 کیلوگرم الیاف پلی وینیل الکل (0.125 %) به ترتیب 12 و 28 درصد به نسبت مخلوط فاقد الیاف افزایش داشته و به 106 کیلونیوتن و 128 ژول افزایش یافت. میزان عمق نفوذ آب تحت فشار برای مخلوط فاقد الیاف 4.5 میلیمتر و در مخلوط‌های حاوی الیاف بین 3.5 تا 4.5 میلیمتر بدست آمد. بیشنرین کاهش جذب آب نیم ساعته و 24 ساعته به نسبت مخلوط فاقد الیاف به ترتیب با 40 و 23 درصد کاهش در مخلوط حاوی 1 کیلوگرم الیاف پلی وینیل الکل (0.125 %) حاصل شد. کمترین عرض سایش در مخلوط‌های حاوی 20 و 30 کیلوگرم الیاف فولادی (1% و 1.5 %) به مقدار 15 میلیمتر و بیشترین عرض سایش در مخلوط‌ حاوی 4 کیلوگرم الیاف پلی وینیل الکل (0.5 %) به مقدار 19 میلیمتر تعیین شد. کمترین ...

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental Evaluation of Mechanical and Durability Performance of Steel/PVA Fiber-Reinforced Engineered Cementitious Composites for Pavement Overlay

نویسندگان [English]

  • Mahdi KouhiAzar Tulun 1
  • Jafar Sobahni 2
  • Seyyed Mohammad Mirhosseini 3
  • Ehsanollah Zeighami 4
  • Mohammad Reza Basiri 5
1 Department of Civil Engineering, Arak Branch, Islamic Azad University
2 Department of Concrete Technology, Road, Housing & Urban Development Research Center (BHRC)
3 Arak Branch, Islamic Azad University
4 Arak Branch, Islamic Azad University
5 Arak Branch, Islamic Azad University
چکیده [English]

This paper investigates the effects of hooked steel and polyvinyl alcohol fibers on mechanical properties (compressive strength, flexural strength, tensile strength, elastic modulus) and durability (water penetration under pressure, 30-minute and 24-hour water absorption, abrasion resistance, accelerated chloride ion penetration, electrical resistance, and scaling due to freeze-thaw cycles) of engineered cementitious composites for use as repair materials in concrete overlays through experimental studies. Results showed the 7-day compressive strength, splitting tensile strength and elastic modulus of the mixture containing 30 kg steel fibers had the greatest improvement compared to the fiber-free mixture with 40%, 13% and 24% increase respectively. The flexural strength and energy absorption of the mixture containing 1 kg polyvinyl alcohol fibers increased by 12% and 28% respectively compared to the fiber-free mixture, reaching 106 kN and 128 J. Water penetration depth under pressure was 4.5 mm for the fiber-free mixture and ranged between 3.5-4.5 mm for fiber-containing mixtures. The maximum reduction in 30-minute and 24-hour water absorption compared to the fiber-free mixture was 40% and 23% respectively, achieved by the mixture containing 1 kg polyvinyl alcohol fibers. The smallest abrasion width was 15 mm in mixtures containing 20 and 30 kg steel fibers, while the largest was 19 mm in the mixture containing 4 kg polyvinyl alcohol fibers. The lowest scaling due to freeze-thaw cycles and accelerated chloride ion penetration were 4.44 g/m² and 165 Coulombs respectively in the mixture containing 2 kg polyvinyl alcohol fibers. Considering the favorable results from durability tests, this cementitious composite ...

کلیدواژه‌ها [English]

  • Engineered Cementitious Composites (ECC)
  • Mechanical Response
  • Energy Absorption
  • Pavement Overlay
  • steel -PVA fibers
  • Supplementary Cementitious Material (SCM)

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