The Feasibility of Applying Waste Concrete as Coarse Aggregates in New Concrete
Received: 17 July 2022 | Revised: 26 July 2022 | Accepted: 27 July 2022 | Online: 2 October 2022
Corresponding author: V. T. Phan
This paper presents a study on the possibility of replacing natural coarse aggregates with recycled aggregates in concrete in terms of strength, namely compressive strength and flexural strength. The concrete was designed to have a 25MPa compressive strength and an 8cm slump. The replacement rates of natural aggregates with recycled coarse aggregates were 0%, 10%, 15%, and 20%. The test samples were compressed to determine their strength value after 28 days of curing. The research results give a more complete assessment of the efficiency of the use of recycled raw aggregates instead of natural aggregates in concrete. The results indicate that using recycled aggregates is feasible due to the small decrease in concrete strength. The experiment shows that up to 20% replacement, the recorded reduction in the strength of concrete is lower than 15%. However, it is indispensable that the strength of concrete should be enhanced when recycled aggregates are used. According to previous works, fiber reinforcement may be an effective solution. Therefore, to further develop research using recycled aggregates, it is necessary to consider using different fibers to strengthen the concrete. The fiber content can be used in the range of 0-1% of the weight of concrete.
Keywords:compressive strength, flexural strength, waste concrete, demolishing work
M. T. El-Hawary, C. Koenke, A. El-Nemr, and N. F. Hanna, "Using Recycled Concrete as a Replacement for Coarse Aggregate in the Production of Green Concrete," in Sustainable Issues in Infrastructure Engineering, Cham, Switzerland, 2021, pp. 127–151. DOI: https://doi.org/10.1007/978-3-030-62586-3_9
B. Panda, N. T. Imran, and K. Samal, "A Study on Replacement of Coarse Aggregate with Recycled Concrete Aggregate (RCA) in Road Construction," in Recent Developments in Sustainable Infrastructure, Singapore, 2021, pp. 1097–1106. DOI: https://doi.org/10.1007/978-981-15-4577-1_91
D. D. Nguyen and V. T. Phan, "Compressive Strength Studies on Recycled Binder Concrete," Engineering, Technology & Applied Science Research, vol. 11, no. 4, pp. 7332–7335, Aug. 2021. DOI: https://doi.org/10.48084/etasr.4230
V. T. Phan and T. H. Nguyen, "The Influence of Fly Ash on the Compressive Strength of Recycled Concrete Utilizing Coarse Aggregates from Demolition Works," Engineering, Technology & Applied Science Research, vol. 11, no. 3, pp. 7107–7110, Jun. 2021. DOI: https://doi.org/10.48084/etasr.4145
X. H. Vu, T. C. Vo, and V. T. Phan, "Study of the Compressive Strength of Concrete with Partial Replacement of Recycled Coarse Aggregates," Engineering, Technology & Applied Science Research, vol. 11, no. 3, pp. 7191–7194, Jun. 2021. DOI: https://doi.org/10.48084/etasr.4162
H. Opara, U. Eziefula, and C. Ugwuegbu, "Experimental study of concrete using recycled coarse aggregate," International Journal of Materials and Structural Integrity, vol. 10, no. 4, pp. 123–132, Dec. 2016. DOI: https://doi.org/10.1504/IJMSI.2016.10003018
R. Sri Ravindrarajah and C. T. Tam, "Properties of concrete made with crushed concrete as coarse aggregate," Magazine of Concrete Research, vol. 37, no. 130, pp. 29–38, Mar. 1985. DOI: https://doi.org/10.1680/macr.19126.96.36.199
A. Namdar, I. B. Zakaria, A. B. Hazeli, S. J. Azimi, A. S. B. A. Razak, and G. S. Gopalakrishna, "An experimental study on flexural strength enhancement of concrete by means of small steel fibers," Frattura ed Integrità Strutturale, vol. 7, no. 26, pp. 22–30, Sep. 2013. DOI: https://doi.org/10.3221/IGF-ESIS.26.03
S. T. Kang, B. Y. Lee, J.-K. Kim, and Y. Y. Kim, "The effect of fibre distribution characteristics on the flexural strength of steel fibre-reinforced ultra high strength concrete," Construction and Building Materials, vol. 25, no. 5, pp. 2450–2457, May 2011. DOI: https://doi.org/10.1016/j.conbuildmat.2010.11.057
H. binti Hashim et al., "Improving the mechanical properties of polycaprolactone using functionalized nanofibrillated bacterial cellulose with high dispersibility and long fiber length as a reinforcement material," Composites Part A: Applied Science and Manufacturing, vol. 158, Jul. 2022, Art. no. 106978. DOI: https://doi.org/10.1016/j.compositesa.2022.106978
How to Cite
MetricsAbstract Views: 560
PDF Downloads: 262
Copyright (c) 2022 T. H. Nguyen, T. T. T. Nguyen, T. T. H. Nguyen, V. T. Phan
This work is licensed under a Creative Commons Attribution 4.0 International 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.