Performance of fly ash-blended Portland cement concrete developed by using fine or coarse recycled concrete aggregate

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Şimşek O., Pourghadri Sefidehkhan H., Gökçe H. S.

CONSTRUCTION AND BUILDING MATERIALS, vol.357, no.129431, pp.1-8, 2022 (SCI-Expanded)

• Publication Type: Article / Article
• Volume: 357 Issue: 129431
• Publication Date: 2022
• Doi Number: 10.1016/j.conbuildmat.2022.129431
• Journal Name: CONSTRUCTION AND BUILDING MATERIALS
• Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, CAB Abstracts, Communication Abstracts, INSPEC, Metadex, Veterinary Science Database, Civil Engineering Abstracts
• Page Numbers: pp.1-8
• Gazi University Affiliated: Yes

Abstract

share due to the growing environmental concerns of the world. In this study, the use of recycled concrete

aggregate at various replacement amounts (0–100 %) was investigated to be fine or coarse aggregate sources

instead of crushed natural aggregate to understand better its effects on the dimensional stability and durability

aspects of fly ash-blended Portland cement concrete. In the presence of recycled concrete aggregate, fly ash was

very important for eliminating possible mechanical losses of concrete at 90 days. The use of coarse recycled

concrete aggregate resulted in better compressive strength values of concrete exposed to with and without

wetting–drying and freezing-thawing cycles when compared to fine ones. While the free drying shrinkage of

concrete increased at significant amounts (68 and 79 %) for fine and coarse recycled concrete aggregate, the

restrained drying shrinkage crack widths were reduced up to by 13.5 %. In conclusion, it should be noted that the

amount and size of recycled concrete aggregate need to be designed by considering the residual quality and

dimensional stability of concrete, which exposes weathering actions in place.