Next Article in Journal
Experimental Research on Using Form-stable PCM-Integrated Cementitious Composite for Reducing Overheating in Buildings
Next Article in Special Issue
Shear Strength of Geopolymer Concrete Beams Using High Calcium Content Fly Ash in a Marine Environment
Previous Article in Journal
Numerical Simulation of the Semi-Rigid Behaviour of Integrally Attached Timber Folded Surface Structures
Article Menu
Issue 3 (March) cover image

Export Article

Open AccessArticle

Evaluation of Concrete Strength Made with Recycled Aggregate

1
Department of Civil Engineering, American University of Sharjah, P.O. Box 26666, Sharjah, UAE
2
Proceq Middle East, Sharjah 8365, UAE
3
Civil Engineering, American University of Sharjah, P.O. Box 26666, Sharjah, UAE
*
Author to whom correspondence should be addressed.
Buildings 2019, 9(3), 56; https://doi.org/10.3390/buildings9030056
Received: 28 January 2019 / Revised: 11 February 2019 / Accepted: 24 February 2019 / Published: 1 March 2019
  |  
PDF [3344 KB, uploaded 20 March 2019]
  |     |  

Abstract

The construction industry consumes enormous quantities of concrete, which subsequently produces large amount of material waste during production and demolishing. As a result, the colossal quantity of concrete rubble is disposed in landfills. This paper, therefore, evaluated the feasibility of reusing waste concrete as recycled aggregate (RA) to produce concrete. The replacement levels were 20, 50, and 80% RA of normal coarse aggregate. Micro silica (MS) and fly ash (FA) were used as cementitious replacement material, however, the water-to-binder ratio (w/b) was kept constant at 0.31. A total of 44 specimens were used to evaluate the fresh and hardened properties. Concrete with 80% RA showed good workability and mechanical properties. The compressive strength of the concrete with 80% RA was 60 MPa at 28 days and 77 MPa at 56 days. Rapid chloride penetration test (RCPT) was also conducted, where the concrete with 80% RA had the lowest permeability. View Full-Text
Keywords: recycled aggregate; fly ash; silica fume; workability; compressive strength; tensile strength; RCPT recycled aggregate; fly ash; silica fume; workability; compressive strength; tensile strength; RCPT
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Al Ajmani, H.; Suleiman, F.; Abuzayed, I.; Tamimi, A. Evaluation of Concrete Strength Made with Recycled Aggregate. Buildings 2019, 9, 56.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Buildings EISSN 2075-5309 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top