Structural Engineering and Mechanics

  • 제88권2호
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  • Pages.141-157
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  • 2023
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
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DOI QR Code

Mechanical, rheological, and durability analysis of self-consolidating concretes containing recycled aggregates

  • Hiwa Mollaei (Department of Civil Engineering, Tabriz Branch, Islamic Azad University) ;
  • Taleb Moradi Shaghaghi (Department of Civil Engineering, Tabriz Branch, Islamic Azad University) ;
  • Hasan Afshin (Department of Civil Engineering, Sahand University of Technology) ;
  • Reza Saleh Ahari (Department of Civil Engineering, Tabriz Branch, Islamic Azad University) ;
  • Seyed Saeed Mirrezaei (Department of Civil Engineering, Tabriz Branch, Islamic Azad University)
  • 투고 : 2023.06.05
  • 심사 : 2023.09.12
  • 발행 : 2023.10.25
⟨ 이전 논문 다음 논문 ⟩

초록

In the present paper, the effect of recycled aggregates on the rheological and mechanical properties of self-consolidating concrete is investigated experimentally and numerically. Hence, the specimen with two types of recycled aggregates, i.e., known and unknown resistance origins, are utilized for the studied specimens. The experiments in this study are designed using the Box-Behnken method, which is one of the response surface methods. Input variables in mixtures include silica fume in the range of 5-15% as a percentage substitute for cement weight and recycled coarse and fine aggregates in the range of 0-50% for both series of recycled materials as a substitute for natural materials. The studied responses are slump flow, V funnel, compressive strength, tensile strength, and durability. The results indicate that the increase in the amount of recycled aggregates reduces the rheological and mechanical properties of the mixtures, while silica fume effectively improves the mechanical properties. In addition, the results demonstrate that the fine recycled aggregates affect the total response of the concrete significantly. The results of tensile and compressive strengths indicate that the mixtures including 50% recycled materials with known resistance origin demonstrate better responses up to 8 and 10% compared to the materials with unknown resistance origins, respectively. Recycled materials with a specific resistance origin also show better results than recycled materials with an unknown resistance origin. Durability test results represent those concretes containing recycled coarse aggregates have lower strength compared to recycled fine aggregates. Also, a series of mathematical relationships for all the responses are presented using variance analysis to predict mixtures' rheological and mechanical properties.

키워드

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