Effect of Fly Ash on the Compressive Strength of Green Concrete

  • S. A. Chandio Department of Civil Engineering, Quaid-e-Awam University of Engineering Science & Technology, Pakistan
  • B. A. Memon Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Pakistan
  • M. Oad Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Pakistan
  • F. A. Chandio Department of Civil Engineering, Quaid-e-Awam University of Engineering Science & Technology, Pakistan
  • M. U. Memon Department of Civil Engineering, Quaid-e-Awam University of Engineering Science & Technology, Pakistan


This research paper aims at investigating the effects of fly ash as cement replacement in green concrete made with partial replacement of conventional coarse aggregates with coarse aggregates from demolishing waste. Green concrete developed with waste materials is an active area of research as it helps in reducing the waste management issues and protecting the environment. Six concrete mixes were prepared using 1:2:4 ratio and demolishing waste was used in equal proportion with conventional aggregates, whereas fly ash was used from 0%-10% with an increment of 2.5%. The water-cement ratio used was equal to 0.5. Out of these mixes, one mix was prepared with all conventional aggregates and was used as the control, and one mix with 0% fly ash had only conventional and recycled aggregates. The slump test of all mixes was determined. A total of 18 cylinders of standard size were prepared and cured for 28 days. After curing the compressive strength of the specimens was evaluated under gradually increasing load until failure. It is observed that 5% replacement of cement with fly ash and 50% recycled aggregates gives better results. With this level of dosage of two waste materials, the reduction in compressive strength is about 11%.

Keywords: recycled aggregates, demolishing waste, fly ash, green concrete, compressive strength


Download data is not yet available.


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. 1-16, 2016

Z. Tafheem, S. Khusru, S. Nasrin, “Environmental impact of green concrete in practice”, International Conference on Mechanical Engineering and Renewable Energy, Chittagong, Banglades, December 22-24, 2011

B. Suhendro, “Toward green concrete for better sustainable environment”, Procedia Engineering, Vol. 95, pp. 305-320, 2014 DOI: https://doi.org/10.1016/j.proeng.2014.12.190

V. S. Vairagade D. K. Parbat, S. A. Dhale, “Fly ash as sustainable material for green concrete: A state-of-art”, International Journal of Research in Engineering, Science & Technology, Vol. 1, No. 2, pp. 17-24, 2015

N. M. Altwair, S. Kabir, “Green concrete structures by replacing cement with pozzolanic materials to reduce greenhouse gas emissions for sustainable environment”, 6th International Engineering and Construction Conference, Cairo, Egypt, June 28-30, 2010

S. C. K. Bendapudi, P. Saha, “Contribution of fly ash to the properties of mortar and concrete”, International Journal of Earth Sciences and Engineering, Vol. 4, No. 6, pp. 1017-1023, 2011

N. M. Altwair, S. Kabir, “Reducing environmental impacts through green concrete technology”, 3rd Technology and Innovation for Sustainable Development International Conference, Khon Kaen University, Thailand, March 4-6, 2010

C. Edvardsen, K. Tollose, “Environmentally “green” concrete structures”, FIB Symposium: Concrete and Environment, Berlin, Germany, October 3-5, 2001

P. Nath, P. Sarker, “Effect of fly ash on the durability properties of high strength concrete”, Procedia Engineering, Vol. 14, pp.1149-1156, 2011 DOI: https://doi.org/10.1016/j.proeng.2011.07.144

A. Jatale, K. Tiwari, S. Khandelwal, “Effects on compressive strength when cement is partially replaced by fly ash”, IOSR Journal of Mechanical and Civil Engineering, Vol. 5, No. 4, pp. 34-43, 2013 DOI: https://doi.org/10.9790/1684-0543443

S. Wang, V. C. Li, “Engineered cementitious composites with high-volume fly ash”, ACI Materials Journal, Vol. 104, No. 3, pp. 233-241, 2007 DOI: https://doi.org/10.14359/18668

B. S. Kumar, V. P. Arunachalam, R. Thenmozhi, T. S. Vadive, “Effect on strength characteristics of low calcium fly ash based geopolymer concrete: An initiative towards green concrete”, International Journal of Applied Environmental Sciences, Vol. 11, No. 1, pp. 173-182, 2016

C. M. Helepciuc, M. Barbuta, D. Babor, “Investigations on a green concrete obtaining through a partial cement Replacement by fly ash”, Advances in Environmental Sciences, Vol. 9, No. 3, pp. 207-214, 2017

S. A. K. Reddy, K. C. Reddy, “Effect of fly ash on strength and durability parameters of concrete”, International Journal of Science and Research, pp. 2319-7064, 2013

N. Bheel, A. W. Abro, I. L. Shar, A. A. Dayo, S. Shaikh, Z. H. Shaikh, “Use of rice husk ash as cementitious material in concrete”, Engineering, Technology & Applied Science Research, Vol. 9, No. 3, pp. 4209-4212, 2019 DOI: https://doi.org/10.48084/etasr.2746

D. F. A. Olutoge, H. A. Quadri, O. S. Olafusi, “Investigation of the strength properties of palm kernel shell ash concrete”, Engineering, Technology & Applied Science Research, Vol. 2, No. 6, pp. 315-319, 2012 DOI: https://doi.org/10.48084/etasr.238

A. Krishnamoorthi, G. M. Kumar, “Properties of green concrete mix by concurrent use of fly ash and quarry dust”, IOSR Journal of Engineering, Vol. 3, Noi. 8, pp. 48-54, 2013 DOI: https://doi.org/10.9790/3021-03834854

M. Oad, B. A. Memon, “Compressive strength of concrete cylinders using coarse aggregates from old concrete”, 1st National Conference on Civil Engineering (Modern Trends and Advancements), Pakistan, April 28–29, 2014


Abstract Views: 463
PDF Downloads: 199

Metrics Information
Bookmark and Share

Most read articles by the same author(s)

> >>