عمل‌آوری داخلی بتن فوق‌توانمند با استفاده از ماسه اسکوریا: جمع‌شدگی خودزا، خواص مقاومتی و خواص انتقالی

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

1 گروه مهندسی سازه، دانشکده مهندسی عمران، دانشگاه تبریز

2 دانشکده مهندسی عمران، دانشگاه تبریز

10.22034/ceej.2025.66789.2428

چکیده

بتن فوق توانمند نوع جدیدی از کامپوزیت‌های پایه سیمانی با خصوصیات مکانیکی بسیار بالا و دوام بهبود یافته می‌باشد که معمولاً با دانه‌بندی بهینه اجزای دانه‌ای، نسبت آب به سیمان بسیار پایین، درصد بالای مواد سیمانی و به‌کارگیری میکروالیاف فولادی ساخته می‌شود. با این‌ حال، بتن فوق ­توانمند به ­دلیل استفاده از مقادیر بالای سیمان و نسبت آب به سیمان بسیار پایین، جمع‌شدگی خودزای قابل‌توجهی دارد. عمل‌آوری داخلی یکی از روش‌های موفق و مفید برای کاهش جمع‌شدگی خودزای بتن فوق ­توانمند می‌باشد؛ بنابراین در این تحقیق، آزمایشگاهی از ماسه اسکوریا (Scoria Sand) از پیش ­اشباع شده در مقادیر مختلف 0، 25، 50، 75 و 100 درصد برای جایگزینی ماسه طبیعی رودخانه‌ای به‌منظور عمل‌آوری داخلی بتن فوق ­توانمند استفاده شده است. بدین­ منظور پس از آماده‌سازی نمونه‌ها آزمایش‌های تعیین جمع‌شدگی خودزا، مقاومت فشاری و خمشی، درصد جذب آب کاپیلاره (Capillary Water Absorption)، سرعت پالسی و درصد جذب آب بتن فوق ­توانمند انجام یافت. با درنظر گرفتن نتایج به‌دست‌آمده، مشاهده می‌گردد که با افزایش محتوای ماسه اسکوریا از پیش­ اشباع شده در مخلوط‌های بتن فوق­ توانمند، جمع‌شدگی خودزا و خصوصیات مقاومتی کاهش‌یافته و خصوصیات انتقالی از قبیل درصد جذب آب و جذب آب کاپیلاره افزایش می‌یابد. براین‌اساس، جایگزینی ۲۵ درصد ماسه اسکوریا از پیـش­ اشباع شده با ماسه طبیعی رودخانه‌ای، بهینه‌ترین نسبت برای کاهش جمع‌شدگی خودزا و حفظ خواص مکانیکی و انتقالی بتن فوق ­توانمند می‌باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Internal Curing of UHPC Using Scoria Sand: Autogenous Shrinkage, Strength and Transport Properties

نویسندگان [English]

  • Meysam Aghapour 1
  • Jamshid Esmaeili 2
  • Jamil Kasaei 2
1 Department of Structural Engineering, Faculty of Civil Engineering, University of Tabriz, Tabriz, Iran
2 Faculty of Civil Engineering, University of Tabriz, Tabriz, Iran
چکیده [English]

Various methods and strategies have been reported to mitigate the Autogenous shrinkage of Concrete Such as implementation of internal curing and Shrinkage-Reducing Materials. The method and approach examined in this research is internal curing. This paper presents the results of a laboratory investigation into the key properties of ultra high-performance concrete containing different percentages of pre-soaked scoria sand. In this research, the properties of UHPC containing five different amounts of pre-soaked scoria sand (0, 25, 50, 75, and 100% by volume) were investigated. Autogenous shrinkage in UHPC containing different amounts of pre-soaked scoria sand was measured and compared with control specimens. Furthermore, Compressive and flexural strengths, pulse velocity, capillary water absorption, and water absorption percentage at the age of 7, 28, and 90 days were obtained and evaluated as mechanical and transport properties.

کلیدواژه‌ها [English]

  • UHPC
  • Internal curing
  • Pre-soaked scoria sand
  • Autogenous shrinkage
  • Strength properties
  • Transport properties

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