Flexural Behavior of RC Beams Made with Recycled Aggregates Under 12-Month Long Term Loading
Abstract
In the present era of infrastructure development, demolishing waste management poses serious problems, particularly in urban centers. Vast development requires huge amounts of conventional concrete aggregates resulting in serious environmental problems. Therefore, efforts are carried out in utilizing demolishing waste, particularly demolishing concrete as coarse aggregates used in new concrete. This article presents laboratory investigations of flexural behavior of reinforced concrete beams made with partial replacement of natural coarse aggregates with coarse aggregates from demolished concrete under 12-month long-term loading. Two batches of beams were cast and cured for 28 days. In the first batch three RC beams with partial replacement of natural coarse aggregates were cast, while in the second batch 6 RC beams with all-natural coarse aggregates were prepared. Out of these six beams three beams were tested under short-term loading to determine maximum load. 50% of this load was used as sustained load on the remaining all beams. The beams were mounted on purpose made frames and deflection, strain, and cracking were recorded on daily basis. After the elapse of the defined time the beams were tested under central point load until failure. Result comparison shows a 4.96% increase in deflection and 2.33% reduction in peak load. Based on the results of this study it is concluded that demolished concrete as coarse aggregates in new concrete shows reasonably good performance under 12-month long-term loading.
Keywords:
recyclable aggregates, reinforced concrete beam, demolishing waste, flexural behavior, long-term loading, green concreteDownloads
References
B. A. Memon, “Recent Development on Use of Demolished Concrete as Coarse Aggregates”, International Journal of Emerging Technology and Innovative Engineering, Vol. 2, No. 1, pp. 1-11, 2016
M. Oad, A. H. Buller, B. A. Memon, N. A. Memon, S. Sohu, “Flexural Stress-Strain Behavior of RC Beams made with Partial Replacement of Recyclable Concrete Aggregates, Part-2: Rich Mix”, Engineering Technology and Applied Science Research, Vol. 8, No. 5, pp. 3338-3343, 2018 DOI: https://doi.org/10.48084/etasr.2129
M. Oad, A. H. Buller, B. A. Memon, N. A. Memon, “Flexural Stress-Strain Behavior of RC Beams made with Partial Replacement of Coarse Aggregates with Coarse Aggregates from Old Concrete Part-1(124 Ratio)”, Engineering Technology and Applied Science Research, Vol. 8, No. 3, pp. 3048-3053, 2018 DOI: https://doi.org/10.48084/etasr.1982
S. Laserna, J. Montero, “Influence of Natural Aggregates Typology on Recycled Concrete Strength Properties”, Construction and Building Materials, Vol. 115, pp. 78-86, 2016 DOI: https://doi.org/10.1016/j.conbuildmat.2016.04.037
N. K. Bairagi, K. Ravande, V. K. Pareek, “Behavior of Concrete with Different Proportions of Natural and Recycled Aggregates”, Resources, Conservation and Recycling, Vol. 9, pp. 109-126, 1993 DOI: https://doi.org/10.1016/0921-3449(93)90036-F
B. S. Hamad, A. H. Dawi, A. Daou, G. R. Chehab, “Studies of the Effect of Recycled Aggregates on Flexural, Shear and Bond Splitting Beam Structural Behavior”, Case Studies in Construction Materials, Vol. 9, Article ID e00186, 2018 DOI: https://doi.org/10.1016/j.cscm.2018.e00186
C. Liu, Z. Y. Lv, C. Zhu, G. L. Bai, Y. Zhang, “Study on Calculation Method of Long Term Deformation of RAC Beam based on Creep Adjustment Coefficient”, KSCE Journal of Civil Engineering, Vol. 23, No. 1, pp. 260-267, 2019 DOI: https://doi.org/10.1007/s12205-018-0131-6
M. Oad, B. A. Memon, “Compressive Strength of Concrete Cylinders using Coarse Aggregates from Old Concrete”, 1st National Conference on Civil Engineering (NCCE 2013-14)-(Modern Trends and Advancements), Nawabshah, Pakistan, April 28–29, 2014
D. H. Moneti, L. Torres, M. C. Torrijos, R. Giaccio, R. Marti-Vargas, P. Serna, “Long-Term Behavior of Cracked Fiber Reinforced Concrete under Service Conditions”, Construction and Building Materials, Vol. 196, pp. 649-658, 2019 DOI: https://doi.org/10.1016/j.conbuildmat.2018.10.230
C. Mias, Torres, A. Turon, I. A. Sharaky, “Effect of Material Properties on Long-Term Deflections of GFRP Reinforced Concrete Beams”, Construction and Building Materials, Vol. 41, pp. 99-108, 2013 DOI: https://doi.org/10.1016/j.conbuildmat.2012.11.055
D. Bacinskas, G. Kaklauskas, V. Gribniak, W. P. Sung, M. H. Shih, “Layer Model for Long-Term Deflection Analysis of Cracked Reinforced Concrete Bending Members”, Mechanics of Time-Dependent Materials, Vol. 16, No. 2, pp. 117-127, 2012 DOI: https://doi.org/10.1007/s11043-011-9138-9
M. Oad, A. H. Buller, B. A. Memon, N. A. Memon, “Impact of Long-Term Loading on Reinforced Concrete Beams made with Partial Replacement of Coarse Aggregates with Recyclable Aggregates from Old Concrete”, Engineering, Technology & Applied Science Research, Vol. 9, No. 1, pp. 3818-3821, 2019 DOI: https://doi.org/10.48084/etasr.2498
Downloads
Additional Files
How to Cite
License
Authors who publish with this journal agree to the following terms:
- Authors retain the copyright and grant the journal the right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) after its publication in ETASR with an acknowledgement of its initial publication in this journal.
