مقایسه تاثیر الیاف مصنوعی میکرو و ماکرو بر خصوصیات مقاومتی روسازی های بتنی درزدار با در نظر گرفتن مقاومت خمشی پسماند

نوع مقاله : مقاله پژوهشی

نویسندگان

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

2 دانش آموخته کارشناسی ارشد، گروه راه و ترابری، دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران، تهران، ایران

3 دانش آموخته کارشناسی، دانشکده مهندسی عمران و محیط زیست، دانشگاه صنعتی امیر کبیر (پلی تکنیک تهران)، تهران، ایران

چکیده

افزودن الیاف با خصوصیات فیزیکی و مقاومتی متفاوت، تاثیرات متفاوتی بر خصوصیات مقاومتی روسازی های بتنی درزدار در هنگام گسیختگی و همچنین بر مقاومت خمشی پسماند روسازی دارد. این تحقیق، به بررسی اثر مجزا و مقایسه ای الیاف میکرو و ماکروی مصنوعی بر خصوصیات مقاومتی روسازی های بتنی درزدار، با در نظر گرفتن مقاومت خمشی پسماند روسازی می پردازد. بدین منظور، اثر افزودن دو نوع الیاف ماکرو و یک نوع الیاف میکرو در مقادیر مصرف 1، 2 و 3 کیلوگرم بر متر مکعب مقاومت فشاری، مقاومت کششی دو نیم شدن، مقاومت خمشی و عملکرد خمشی پس از ترک خوردگی روسازی بتنی بررسی گردید. نتایج نشان داد که الیاف میکرو در تمامی مقادیر مصرف، کمترین تاثیر را بر خصوصیات مقاومتی روسازی نسبت به الیاف ماکرو دارد. همچنین افزودن الیاف ماکرو، تاثیر محسوسی بر مقاومت فشاری نداشته، اما مقاومت کششی دو نیم شدن، مقاوم خمشی و مقاومت خمشی پسماند روسازی را به طور چشمگیری افزایش می دهد. اثر الیاف ماکرو بر بهبود مقاومت کششی و مدول گسیختگی روسازی، در مقادیر مصرف بالاتر از 2 کیلوگرم بر متر مکعب رخ داده، اما بیشترین افزایش نسبت مقاومت خمشی معادل روسازی با مصرف الیاف در

بازه ی 1 تا 2 کیلوگرم بر متر مکعب اتفاق می افتد و با افزودن بیشتر الیاف ماکرو، روند رشد افزایشی مقاومت خمشی پسماند، کاهش می یابد. دیده شد که الیاف ماکرو بیشترین تاثیر را بر مقاومت خمشی و مقاومت خمشی پسماند روسازی دارد. همچنین، عملکرد الیاف ماکروی در هم تابیده و برجسته ی پیوسته در تمامی مقادیر مصرف، نزدیک به هم است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Comparison of the Effect of Micro and Macro Synthetic Fibers on the Strength Properties of Jointed Concrete Pavements Considering the Residual Flexural Strength

نویسندگان [English]

  • Abolfazl Hassani 1
  • Seyed Javad Vaziri Kang Oleyaei 2
  • Mohammad Reza Hajizadeh 3
1 Professor, Department of Roads and Transportation, Faculty of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran.
2 M.Sc., Grad., School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran.
3 M.Sc., Grad., Department of Civil and Environmental Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.
چکیده [English]

The addition of fibers with different physical and strength properties has different effects on the strength properties of jointed concrete pavements at rupture and also on the residual flexural strength of the pavement. This study investigates the separate and comparative effect of micro and macro synthetic fibers on the strength properties of jointed concrete pavements, considering the residual flexural strength of the pavement. For this purpose, the effect of adding two types of macro fibers and one type of micro fiber in the content of 1, 2, and 3 kg/m3 on compressive strength, splitting tensile strength, flexural strength, and flexural performance after cracking of concrete pavement were investigated. The results showed that micro fibers in all consumption contents have the least effect on the strength properties of pavement compared to macro fibers. Also, the addition of macro fibers did not have a significant effect on the compressive strength, but the splitting tensile strength, flexural strength, and residual flexural strength of pavement were significantly increased. The effect of macro fibers on improving the splitting tensile strength and modulus of rupture of pavement occurred at dosage rates higher than

2 kg/m3. However, the most significant increase in the equivalent flexural strength ratio of fiber reinforced concrete pavement occurred in the range of 1 to 2 kg/m3, and by adding higher contents of macro fibers, the increasing growth trend of residual flexural strength decreased. It was founded that macro fibers have the most excellent effect on flexural strength and residual flexural strength of the pavement. Also, the performance of twisted and continuously embossed macro fibers in all dosage rates was approximately the same.

کلیدواژه‌ها [English]

  • Micro and macro synthetic fibers
  • Fibers comparison
  • Jointed concrete pavement
  • Strength properties
  • Residual flexural strength

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پژوهشنامه حمل و نقل
دوره 20، شماره 2
تیر 1402
صفحه 307-324

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