Evaluation of the double coated recycled concrete aggregates for hot mix asphalt
The use of recycled concrete aggregates (RCAs) in pavement industry can mitigate natural aggregates shortage, promote sustainable practices and reduce construction cost. However, the engineering properties of RCAs are usually inferior to those of natural aggregates. In this investigation, a new stat...
| Main Authors: | , , |
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| Format: | Journal Article |
| Published: |
Elsevier BV
2018
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| Online Access: | http://hdl.handle.net/20.500.11937/66791 |
| _version_ | 1848761393653743616 |
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| author | Kareem, A. Nikraz, Hamid Asadi, H. |
| author_facet | Kareem, A. Nikraz, Hamid Asadi, H. |
| author_sort | Kareem, A. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The use of recycled concrete aggregates (RCAs) in pavement industry can mitigate natural aggregates shortage, promote sustainable practices and reduce construction cost. However, the engineering properties of RCAs are usually inferior to those of natural aggregates. In this investigation, a new state of the art coating technique, namely, double coating technique (DCT), is developed to improve strength and durability of the RCAs. The RCAs were firstly coated with a layer of cement slag paste (CSP) to reinforce its weak particles. Then, a second layer of Sika Tite-BE (here called ABE) was applied to reduce its water/bitumen absorption and enhance the durability. Marshall tests, indirect tensile test, indirect tensile ratio test and indirect tensile resilient modulus test were performed to evaluate intermediate AC14 mixtures made with 0%, 20%, 40% and 60% of double coated recycled concrete aggregates (DCRCAs). The results indicated that the DCT decreases the water absorption of the DCRCAs by 12.3% and 26.1% compared to uncoated RCAs and RCAs coated with CSP respectively. Also, the DCT effectively enhances moisture resistance and produces stiffness higher than 4000 MPa proposed for AC14 intermediate mix according to Australian practices. |
| first_indexed | 2025-11-14T10:30:58Z |
| format | Journal Article |
| id | curtin-20.500.11937-66791 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:30:58Z |
| publishDate | 2018 |
| publisher | Elsevier BV |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-667912020-06-02T02:35:37Z Evaluation of the double coated recycled concrete aggregates for hot mix asphalt Kareem, A. Nikraz, Hamid Asadi, H. The use of recycled concrete aggregates (RCAs) in pavement industry can mitigate natural aggregates shortage, promote sustainable practices and reduce construction cost. However, the engineering properties of RCAs are usually inferior to those of natural aggregates. In this investigation, a new state of the art coating technique, namely, double coating technique (DCT), is developed to improve strength and durability of the RCAs. The RCAs were firstly coated with a layer of cement slag paste (CSP) to reinforce its weak particles. Then, a second layer of Sika Tite-BE (here called ABE) was applied to reduce its water/bitumen absorption and enhance the durability. Marshall tests, indirect tensile test, indirect tensile ratio test and indirect tensile resilient modulus test were performed to evaluate intermediate AC14 mixtures made with 0%, 20%, 40% and 60% of double coated recycled concrete aggregates (DCRCAs). The results indicated that the DCT decreases the water absorption of the DCRCAs by 12.3% and 26.1% compared to uncoated RCAs and RCAs coated with CSP respectively. Also, the DCT effectively enhances moisture resistance and produces stiffness higher than 4000 MPa proposed for AC14 intermediate mix according to Australian practices. 2018 Journal Article http://hdl.handle.net/20.500.11937/66791 10.1016/j.conbuildmat.2018.03.158 Elsevier BV fulltext |
| spellingShingle | Kareem, A. Nikraz, Hamid Asadi, H. Evaluation of the double coated recycled concrete aggregates for hot mix asphalt |
| title | Evaluation of the double coated recycled concrete aggregates for hot mix asphalt |
| title_full | Evaluation of the double coated recycled concrete aggregates for hot mix asphalt |
| title_fullStr | Evaluation of the double coated recycled concrete aggregates for hot mix asphalt |
| title_full_unstemmed | Evaluation of the double coated recycled concrete aggregates for hot mix asphalt |
| title_short | Evaluation of the double coated recycled concrete aggregates for hot mix asphalt |
| title_sort | evaluation of the double coated recycled concrete aggregates for hot mix asphalt |
| url | http://hdl.handle.net/20.500.11937/66791 |