An experimental and analytical study of the effect of using concrete produced from recycled aggregates on reinforced concrete beams subjected to torsion
الملخص
In this research, a study was conducted to determine the effect of recycled aggregates on the mechanical properties of concrete produced from it such as compressive strength, modulus of elasticity and tensile strength. An experimental and analytical study was conducted on the behavior of reinforced concrete beams subject to torsion in all cases of complete and partial replacement according to the following ratios (0%-25%-50%-75%-100%).The current study showed that the studied mechanical properties were influenced by the presence of recycled aggregates, and the experimental results showed a decrease in the cylindrical resistance to pressure by a rate ranging between (3.8%-18.4%), and a decrease in the elastic modulus Ec by a rate ranging between (10.3%-26.9%), and the tensile strength by splitting decreased by a rate ranging between (15.4%-25.8%), with an increase of Reconstituted aggregates compared with reference samples composed of (R0) natural aggregates. An experimental study was conducted by applying the torsional torque on reinforced concrete beams composed of natural aggregates and recycled aggregates of groups (R0,R25,R50,R75,R100) and the results showed that the average maximum torsional torque of three beams of each group decreased by (8.9%-13.1%-20.4%-26.7%) compared to reinforced concrete beams composed of natural aggregates (R0). The analytical results gave a good agreement with the experimental results in terms of the distribution and shape of the cracks, and the results showed that the percentage difference in the maximum torsion moment between the experimental and the analytical ranged between (4%-5.7%), and the difference in the angle of torsion ranged between (4.8%-11.6%) for all groups.
References
[2] - Abukersh, S., "High Quality Recycled Aggregate Concrete" Phd thesis, School of Engineering and the Built Environment, Edinburgh University, UK. (2009).
- [3] Akbari Y. V., Arora N. K., Vakil M. D. "Effect on recycled aggregate on concrete properties", International Journal of Earth Sciences and Engineering, 4, 924-928. (2011).
[4] - Gonzalez B., Martinez F. (2005). "Recycled aggregate concrete: aggregate and mix properties", Material of constructions, Spain, 55, 53-66. (2005).
[5] - I. Maruyama, M. Sogo, T. Sogabe, R. Sato, and K. Kawai, “Flexural properties of reinforced recycled concrete beams,” In: International RILEM conference on the use of recycled materials in buildings and structures, Paper No. 315, Barcelona, Spain, )2004(.
- [6] Kou SH. “Reuse recycled aggregate in structural concrete”، PhD thesis, Polytechnic University, Hong Kong. (2005).
[7]- G. Fonteboa, Belen, F. Martinez, I. Lage, and J. López, “Structral shear behavior of recycled concrete with silica fume,” Constr. Build Master, 23(11), p. 3406-10, )2009(.
[8]- M. Kikuchi, T. Mukai and H. Koizumi, “Properties of concrete products containing recycled aggregate,” In: Proc., 2nd int. symp. on demolition and reuse of concrete and masonry, vol. 2, p. 595–604, )1988(.
[9]- G. Fsthifazl, G. Razaqpur, B. Isgor, A. Abbas, and B. Fournier, “Flexural performance of steel-reinforced recycled concrete beams,” ACI Struct., 106(6), p. 858-67, )2009(.
[10]- Park S. (1999). "Recycled Concrete Construction Rubble as Aggregate for New Concrete", Building Research Association of New Zealand, 86, 1-20. (1999).
[11]- J. Xiao, H. Xie H, and Z. Yang, “Shear transfer across a crack in recycled aggregate concrete,” Cem. Concr. Res., 42, p. 700-9, )2012(.
[12]- Tamador M. Damascus university "Study of mechanical properties of Recycled Aggregate Concrete" (2014).
- [13] ABAQUS, version 6.14-3. Dassault systems similia Gorp, USA. (2015).
- [14] M. Prakash, K. S. Satyanarayanan, N. Parthasarathi, S. Srinivasa Senthil, M. Vishal & V. Deepakraj “An experimental study on reinforced concrete beam with continuous spiral stirrups under pure torsion” European Journal of Environmental and Civil Engineering, 781-793, (2023).
- [15] Atul Patane, Gaurang, Vesmawala "Experimental and analytical investigation of the behavior of reinforced concrete beam under pure torsion "National Institute of Technology, Surat395007, India 2023)).
- [16] Aqeel H., Mazin A. and Zahir M. N.” Verification of a Torsional Behaviour Prediction Model for Reinforced Recycled Aggregate Concrete Beams” Hindawi Journal of Engineering Volume 2022, Article ID 3340489, 13 pages (2022).
[17] - الكود العربي السوري لتصميم وتنقيذ المنشآت بالخرسانة المسلحة (2018)، الطبعة الرابعة، دمشق.
[18] - مقالة " دراسة خواص البيتون المنفذ بركام معاد تدويره "(2021). م. بشرى العكاري، د. سليمان العامودي، مجلة جامعة البعث- المجلد 43 لعام 2021.
[19] - مقالة " دراسة تجريبية لسلوك الجوائز الخرسانية المسلحة المعرضة للفتل باستخدام الركام المعاد تدويره كاستبدال جزئي من الركام الطبيعي "(2023). م. فلاح مبارك، د. منيب العلاف، د. إحسان الطرشة - مجلة جامعة البعث- 2023.
