Advances in concrete construction

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Effect of horizontal joints on structural behavior of sustainable self-compacting reinforced concrete beams

  • Ibrahim, Omar Mohamed Omar (Department of Civil Construction and Architecture, Faculty of Technology and Education, Suez University) ;
  • Heniegal, Ashraf Mohamed (Department of Civil Engineering, Faculty of Engineering, Suez University) ;
  • Ibrahim, Khamis Gamal (Department of Civil Construction and Architecture, Faculty of Technology and Education, Suez University) ;
  • Agwa, Ibrahim Saad (Department of Civil Construction and Architecture, Faculty of Technology and Education, Suez University)
  • Received : 2020.07.19
  • Accepted : 2020.09.15
  • Published : 2020.11.25
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Abstract

This study investigated the effect of horizontal casting joints on the mechanical properties and structural behavior of sustainable self-compacting reinforced concrete beams (SCRCB). The experimental research consisted of two stages. The first stage used four types of concrete mixtures which were produced to indicate the effects of cement replaced with cement waste at 0%, 5%, 10%, and 15% by weight of cement content on fresh concrete properties of self-compacting concrete (SCC) such as, passing ability, filling ability, and segregation resistance. In addition, mechanical properties such as compressive, tensile, and flexural strength were also studied. The second stage selected the best mixture from the first stage and studied the effect of horizontal casting joints on the structural behavior of sustainable SCRCBs. The effect of horizontal casting joints on the mechanical properties and structural behavior were at the 25%, 50%, 75%, and 100% of sample height. Load deflection, failure mode, and theoretical analysis were studied. Results indicated that the incorporation of replacement with cement waste by 5% to 10% led to economic and environmental advantages, and the results were acceptable for fresh and mechanical properties. The results indicated that delaying the time for casting the second layer and increasing the cement waste in concrete mixtures had a great effect on the mechanical properties of SCC. The ultimate load capacity of horizontal casting joints reinforced concrete beams slightly decreased compared with the control beam. The maximum deflection of casting joint beams with 75% of samples height is similar with the control beam. The experimental results of reinforced concrete beams were substantially acceptable with the theoretical results. The failure modes obtained the best forced casting joint on the structural behavior at 50% height of casting in the beam.

Keywords

Acknowledgement

The experimental work was carried out in the structure, material and concrete laboratories of Civil and Architectural construction of Suez University, EGYPT. All the academic and technical staff at the university is gratefully acknowledged.

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