The Influence of Fly Ash on the Compressive Strength of Recycled Concrete Utilizing Coarse Aggregates from Demolition Works
Received: 23 March 2021 | Revised: 4 April 2021 | Accepted: 12 April 2021 | Online: 12 June 2021
Corresponding author: V. T. Phan
Abstract
The compressive strength of recycled concrete with coarse aggregates with and without fly ash was studied in this paper. The recycled concrete was designed to have a compressive strength of Rn=15Mpa. The ratio of conventional aggregates and recycled coarse aggregates was 50-50. Fifteen samples for each recycled concrete aggregate had been cast and were tested 7, 14, and 28 days after curing. The experimental results indicate that the strength development of the two recycled concrete mixes is relatively uniform. Fly ash increased the compressive strength of recycled concrete by 11% for 7-day aged samples. The recycled concrete with fly ash had 7% less compressive strength than the concrete consisting of natural aggregates.
Keywords:
fly ash, recycled concrete, demolishing workDownloads
References
M. F. Koondhar, B. A. Memon, M. Oad, F. A. Chandio, and S. A. Chandio, "Water Penetration of Concrete made with Coarse Aggregates from Demolishing Waste," Engineering, Technology & Applied Science Research, vol. 10, no. 6, pp. 6445–6449, Dec. 2020. DOI: https://doi.org/10.48084/etasr.3891
M. Oad, A. H. Buller, B. A. Memon, N. A. Memon, and S. Sohu, "Flexural Stress-Strain Behavior of RC Beams made with Partial Replacement of Coarse Aggregates with Coarse Aggregates from Old Concrete: Part-2: Rich Mix," Engineering, Technology & Applied Science Research, vol. 8, no. 5, pp. 3338–3343, Oct. 2018. DOI: https://doi.org/10.48084/etasr.2129
M. Oad, A. H. Buller, B. A. Memon, and N. A. Memon, "Impact of Long-Term Loading on Reinforced Concrete Beams Made with Partial Replacement of Coarse Aggregates with Recycled Aggregates from Old Concrete," Engineering, Technology & Applied Science Research, vol. 9, no. 1, pp. 3818–3821, Feb. 2019. DOI: https://doi.org/10.48084/etasr.2498
C. S. Poon, S. C. Kou, and L. Lam, "Use of recycled aggregates in molded concrete bricks and blocks," Construction and Building Materials, vol. 16, no. 5, pp. 281–289, Jul. 2002. DOI: https://doi.org/10.1016/S0950-0618(02)00019-3
Quality protocol: Aggregates from inert waste. Northern Ireland Environment Agency, 2013.
M. Soomro, "Use of Selective Recycled Materials in Civil Engineering Construction," 2013, pp. 635–684. DOI: https://doi.org/10.1142/9789814449175_0010
K. Obla, H. Kim, and C. Lobo, "Crushed Returned Concrete as Aggregates for New Concrete," RMC Research & Education Foundation, 01649378, Sep. 2007.
Erläuterungen zu den Normen DIN EN 206-1, DIN 1045-2, DIN 1045-3, DIN 1045-4 und DIN EN 12620: DAfStb-Heft 526, 2nd ed. Berlin, Germany: Beuth Verlag, 2011.
J. Ahmad Bhat, "Effect of strength of parent concrete on the mechanical properties of recycled aggregate concrete," Materials Today: Proceedings, vol. 42, pp. 1462–1469, Jan. 2021. DOI: https://doi.org/10.1016/j.matpr.2021.01.310
J. Li, J. Zhang, S. Ni, L. Liu, and L. F. Walubita, "Mechanical performance and environmental impacts of self-compacting concrete with recycled demolished concrete blocks," Journal of Cleaner Production, vol. 293, Apr. 2021, Art. no. 126129. DOI: https://doi.org/10.1016/j.jclepro.2021.126129
C. Sun, Q. Chen, J. Xiao, and W. Liu, "Utilization of waste concrete recycling materials in self-compacting concrete," Resources, Conservation and Recycling, vol. 161, Oct. 2020, Art. no. 104930. DOI: https://doi.org/10.1016/j.resconrec.2020.104930
M. Limbachiya, M. S. Meddah, and Y. Ouchagour, "Use of recycled concrete aggregate in fly-ash concrete," Construction and Building Materials, vol. 27, no. 1, pp. 439–449, Feb. 2012. DOI: https://doi.org/10.1016/j.conbuildmat.2011.07.023
T. C. Hansen, "Recycled concrete aggregate and fly ash produce concrete without portland cement," Cement and Concrete Research, vol. 20, no. 3, pp. 355–356, May 1990. DOI: https://doi.org/10.1016/0008-8846(90)90024-R
S. C. Kou, C. S. Poon, and D. Chan, "Influence of Fly Ash as Cement Replacement on the Properties of Recycled Aggregate Concrete," Journal of Materials in Civil Engineering, vol. 19, no. 9, pp. 709–717, Sep. 2007. DOI: https://doi.org/10.1061/(ASCE)0899-1561(2007)19:9(709)
S. A. Chandio, B. A. Memon, M. Oad, F. A. Chandio, and M. U. Memon, "Effect of Fly Ash on the Compressive Strength of Green Concrete," Engineering, Technology & Applied Science Research, vol. 10, no. 3, pp. 5728–5731, Jun. 2020. DOI: https://doi.org/10.48084/etasr.3499
Downloads
How to Cite
License
Copyright (c) 2021 Authors
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.