ارزیابی اثر مقایسه ای الیاف ماکرو پلی پروپیلن و میلگرد های مسلح کننده در کنترل و کاهش ترک خوردگی ناشی از جمع شدگی خمیری در روسازی های بتنی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی عمران و محیط زیست، دانشگاه صنعتی امیر کبیر (پلی تکنیک تهران)، تهران، ایران

2 گروه راه و ترابری، دانشکده مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران، ایران

چکیده

کاهش شدت ترک خوردگی ناشی از جمع شدگی خمیری در روسازی های بتنی با استفاده از مواد و مصالح نوین و مقایسه با روش های سنتی با استفاده از روش های تحلیل نوین، می تواند باعث افزایش دوام و بهبود عملکرد روسازی بتنی گردد. تحقیق حاضر به بررسی اثر مقایسه ای الیاف ماکرو پلی پروپیلن و میلگرد های مسلح کننده در کنترل و کاهش ترک خوردگی ناشی از جمع شدگی خمیری در روسازی های بتنی می پردازد. شدت ترک خوردگی در مخلوط بتنی شاهد، حاوی شبکه فولادی در فواصل 100*100 میلیمتر و حاوی الیاف ماکرو پلی پروپیلن در مقدار 1/8 Kg/m3 مطابق با روش استاندارد ASTM C1579 ارزیابی گردید. نتایج حاکی از آن بود که هر دو عناصر مسلح کننده باعث کاهش چشمگیر مساحت ترک خوردگی ترک خوردگی تا میزان 40% در بتن حاوی شبکه و 68% در بتن الیافی می گردد. طول ترک خوردگی بیشتر از متوسط عرض ترک خوردگی تغییر پیدا می کند. رفتار ترک خوردگی بتن حاوی شبکه فولادی با رفتار ترک خوردگی بتن الیافی مشابه بوده، در نتیجه الیاف ماکرو پلی پروپیلن جایگزین مناسب شبکه فولادی می تواند تلقی گردد. همچنین دیده شد که اثر الیاف در کاهش ترک خوردگی بیشتر از اثر شبکه فولادی است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Evaluation of the comparative effect of macro polypropylene fibers and steel reinforcement bars in controlling and reducing plastic shrinkage cracking in concrete pavements

نویسندگان [English]

  • Mohammad reza Hajizadeh 1
  • Abolfazl Hassani 2
1 Faculty of environment and civil engineering, amirkabir university, tehran, iran
2 Faculty of Environmental and civil engineering
چکیده [English]

Reducing the severity of plastic shrinkage cracking in concrete pavements by using new materials and comparing them with traditional methods by using new analysis methods can increase the durability and improve the performance of concrete pavements. The current research examines the comparative effect of macro polypropylene fibers and reinforcement bars in controlling and reducing plastic shrinkage cracking in concrete pavements. The severity of cracking in the reference concrete mixture, steel bars mesh at intervals of 100 x 100 mm, and macro polypropylene fibers in the amount of 1.8 Kg/m3 was evaluated according to the ASTM C1579 standard method. The results indicated that both reinforcement bars and fibers significantly reduce the cracking area by up to 40% in concrete containing reinforcement and 68% in fiber-reinforced concrete. The length of the crack changes more than the average width of the crack. The cracking behavior of concrete containing steel bars mesh is similar to the cracking behavior of fiber concrete, as a result, macro polypropylene fibers may be considered as a suitable substitute for steel bars mesh. It was also seen that the effect of fibers in reducing cracking is greater than the effect of steel bar mesh.

کلیدواژه‌ها [English]

  • Concrete Pavement
  • Plastic Shrinkage Cracking
  • Steel Bar Mesh
  • Macro Polypropylene Fibers
  • Comparative Effect

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نشریه مهندسی عمران امیرکبیر
دوره 56، شماره 8
1403
صفحه 1009-1026

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