Experimental Analysis of Creep and Shrinkage of Self-Compacting Concrete with Recycled Concrete Aggregates
The recycling of old concrete from the demolition of concrete structures is necessary for the rational use of natural aggregate resources. Recycled concrete aggregates (RCAs) are the highest quality recycled aggregates as they are the closest to natural aggregates. However, the use of RCAs is always...
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MDPI AG
2025-04-01
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| author | Marijan Skazlić Hamdo Mešić Ivan Gabrijel |
| author_facet | Marijan Skazlić Hamdo Mešić Ivan Gabrijel |
| author_sort | Marijan Skazlić |
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| description | The recycling of old concrete from the demolition of concrete structures is necessary for the rational use of natural aggregate resources. Recycled concrete aggregates (RCAs) are the highest quality recycled aggregates as they are the closest to natural aggregates. However, the use of RCAs is always associated with greater fluctuations and usually with a deterioration in workability, mechanical properties and long-term properties. The use of RCA in self-compacting concrete (SCC), where the proportion of aggregate is lower than in conventional concrete, is one way of mitigating the effects of RCAs. In this paper, the effects of coarse and fine RCA are investigated, focusing on dimensional changes due to shrinkage and creep. SCC mixes were developed in which the dolomite aggregates were partially or completely replaced by RCAs and additionally mixes in which 50% of the cement was replaced by fly ash. The average shrinkage strain measured after 180 days increased from 0.34 mm/m for a mix with natural aggregates to 1.04 mm/m for a mix made entirely with RCAs, showing an almost proportional increase in strain with RCA content. At the same age, the creep compliance ranged from 0.07 GPa<sup>−1</sup> for the mix with natural aggregates to 0.34 GPa<sup>−1</sup> for the mix made entirely with RCAs, and is most strongly correlated with hardened concrete density. |
| format | Article |
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| issn | 2076-3417 |
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| spelling | doaj-art-8bc0eaea7f5c4adfb269eadd8878a6cb2025-08-20T02:17:14ZengMDPI AGApplied Sciences2076-34172025-04-01158430910.3390/app15084309Experimental Analysis of Creep and Shrinkage of Self-Compacting Concrete with Recycled Concrete AggregatesMarijan Skazlić0Hamdo Mešić1Ivan Gabrijel2Materials Department, Faculty of Civil Engineering, University of Zagreb, Fra Andrije Kačića Miošića 26, 10000 Zagreb, CroatiaIndependent Researcher, Ulica 502. Viteške Brigade 25, 77000 Bihać, Bosnia and HerzegovinaMaterials Department, Faculty of Civil Engineering, University of Zagreb, Fra Andrije Kačića Miošića 26, 10000 Zagreb, CroatiaThe recycling of old concrete from the demolition of concrete structures is necessary for the rational use of natural aggregate resources. Recycled concrete aggregates (RCAs) are the highest quality recycled aggregates as they are the closest to natural aggregates. However, the use of RCAs is always associated with greater fluctuations and usually with a deterioration in workability, mechanical properties and long-term properties. The use of RCA in self-compacting concrete (SCC), where the proportion of aggregate is lower than in conventional concrete, is one way of mitigating the effects of RCAs. In this paper, the effects of coarse and fine RCA are investigated, focusing on dimensional changes due to shrinkage and creep. SCC mixes were developed in which the dolomite aggregates were partially or completely replaced by RCAs and additionally mixes in which 50% of the cement was replaced by fly ash. The average shrinkage strain measured after 180 days increased from 0.34 mm/m for a mix with natural aggregates to 1.04 mm/m for a mix made entirely with RCAs, showing an almost proportional increase in strain with RCA content. At the same age, the creep compliance ranged from 0.07 GPa<sup>−1</sup> for the mix with natural aggregates to 0.34 GPa<sup>−1</sup> for the mix made entirely with RCAs, and is most strongly correlated with hardened concrete density.https://www.mdpi.com/2076-3417/15/8/4309recycled concrete aggregateself-compacting concretefly ashcreep strain |
| spellingShingle | Marijan Skazlić Hamdo Mešić Ivan Gabrijel Experimental Analysis of Creep and Shrinkage of Self-Compacting Concrete with Recycled Concrete Aggregates Applied Sciences recycled concrete aggregate self-compacting concrete fly ash creep strain |
| title | Experimental Analysis of Creep and Shrinkage of Self-Compacting Concrete with Recycled Concrete Aggregates |
| title_full | Experimental Analysis of Creep and Shrinkage of Self-Compacting Concrete with Recycled Concrete Aggregates |
| title_fullStr | Experimental Analysis of Creep and Shrinkage of Self-Compacting Concrete with Recycled Concrete Aggregates |
| title_full_unstemmed | Experimental Analysis of Creep and Shrinkage of Self-Compacting Concrete with Recycled Concrete Aggregates |
| title_short | Experimental Analysis of Creep and Shrinkage of Self-Compacting Concrete with Recycled Concrete Aggregates |
| title_sort | experimental analysis of creep and shrinkage of self compacting concrete with recycled concrete aggregates |
| topic | recycled concrete aggregate self-compacting concrete fly ash creep strain |
| url | https://www.mdpi.com/2076-3417/15/8/4309 |
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