REUTILIZATION OF RECYCLED CONCRETE AS CONCRETE COARSE AGGREGATE | ||||
| ERJ. Engineering Research Journal | ||||
| Article 5, Volume 27, Issue 1, January 2004, Page 31-38 PDF (2.26 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/erjm.2004.82604 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| Ayman Gamal1; Faiz A. Mirza2 | ||||
| 1Engineering Materials Dep., Faculty of Engineering, Zagazig University, Zagazig, EGYPT. | ||||
| 2Civil Engineering Dep., Faculty of Engineering and Islamic Arch. Umm - Elqura University, Maka, SUADI ARABIA | ||||
| Abstract | ||||
| Demolished concrete which became million tons annually, so reuse of these concrete represents a new source of aggregate. The aim of this paper is to study experimentally the effect of using recycled crushed concrete as a coarse aggregate in concrete mix. The main variables considered in this study were the recycled concrete aggregate (RCA) content (0, 25, 50, 75 and 100% by weight) as substitution of natural aggregate (NA) and Cement content (250, 300, 350 and 400 kg/m”). The strength development under compressive and tensile stresses was measured. Test results showed that the behavior of concrete that contained recycled concrete aggregate and that contained natural aggregate are nearly the same under compression and tension stress. The compressive strength increases by increasing the recycled aggregate content from 25% up to 100%. The tensile strength has optimum value at 50% recycled concrete aggregate content. Also it was found that the compressive and tensile strengths of recycled concrete aggregate specimens were increased by increasing cement content from 250 kg/m² up to 400 kg/m'. This is mainly due to the high reactivity of the recycled concrete and cause alkali-silica bi-reaction. | ||||
| Keywords | ||||
| Recycled concrete; Aggregate; Cement; Strengths | ||||
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