بررسی تأثیر انواع طرح مخلوط و بافت درشت بر مقاومت لغزشی رویه بتن غلتکی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار دانشکده مهندسی عمران دانشگاه تربیت دبیر شهید رجائی

2 دانشجوی دکتری دانشگاه آزاد اسلامی واحد علوم تحقیقات

3 کارشناس ارشد مهندسی عمران گرایش راه و ترابری دانشگاه ازاد واحد تهران جنوب،

چکیده

هدف از این تحقیق، بررسی راهکارهای ارتقای مقاومت لغزندگی رویه بتن غلتکی است. با توجه به اینکه عمده ضعف رویه‌های بتن غلتکی نداشتن بافت درشت روسازی است، در این تحقیق سه نوع بافت دانه‌نشانی (در سه اندازه)، نقش‌اندازی(در دو اندازه) و شیارکشی (یک جهته و دو جهته) مورد توجه قرار گرفت. بنابراین هشت طرح مخلوط برای ساخت نمونه‌های بتن غلتکی انتخاب شد. مقاومت لغزندگی نمونه‌های عمل‌آوری شده به مدت 28 روز قبل و بعد از سایش توسط آزمون پاندول انگلیسی ارزیابی شدند. نتایج نشان داد که سایش سطح بتن، مقاومت لغزندگی نمونه‌های ساخته شده را حدود 10 درصد کاهش می‌دهد. همچنین نتایج نشان داد تغییر طرح‌های مختلف مخلوط، تأثیر محسوسی بر مقاومت لغزندگی ندارد. از طرفی، مقاومت لغزندگی به نوع بافت، کاملا وابسته است به‌گونه‌ای که بافت شیارکشی، بیشترین و دانه‌نشانی، کمترین مقاومت لغزندگی را قبل و بعد از سایش نشان می‌دهند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of the Effect of Various Mixing Designs and Macro Textures on the Skid Resistance of Roller Compacted Concrete Pavement Surface

نویسندگان [English]

  • Mostafa Adresi 1
  • Mohammad Ali Ghanbari 2
  • Alireza Omidi 3
1 Assistant Professor, Department of Civil Engineering ُShahid Rajaee teacher training University
2 PhD student of Islamic Azad University, Research Sciences Branch
3 Department of Civil Engineering, Azad University, South Tehran Branch
چکیده [English]

The purpose of this study is to investigate strategies to improve the skid resistance of roller-compacted concrete. Since the main weakness of roller-compacted concrete is the lack of pavement macrotexture, in this study, three types of macro textures, 1- Seeding (in three aggregate sizes), stamping (in two sizes), and grooving (one-way and two-way) were considered. In this research, eight mixing designs were selected to make roller-compacted concrete samples. The skid resistance of treated samples for 28 days before and after abrasion was evaluated by a British pendulum test. The results showed that concrete surface abrasion reduces the skid resistance of concrete samples by about 10%. The results also showed that changing different mixing designs did not have a significant effect on skid resistance. While the skid resistance is completely dependent on the type of macrotexture so that the grooved macrotexture shows the highest and the seeding shows the lowest skid resistance before and after abrasion.

کلیدواژه‌ها [English]

  • roller compacted concrete pavement
  • mixing design
  • skid resistance
  • Micro/Macro-texture
  • Abrasion
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