A State-of-the-Art Review on the Incorporation of Recycled Concrete Aggregates in Geopolymer Concrete
Geopolymer concrete (GC) has the potential to incorporate recycled concrete aggregates (RCA) obtained from construction and demolition waste. This research aims to review the current state-of-the-art knowledge of the RCA in GC and identify the existing knowledge gaps for future research direction. T...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-07-01
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| Series: | Recycling |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2313-4321/7/4/51 |
| _version_ | 1827598572716032000 |
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| author | Bahareh Nikmehr Riyadh Al-Ameri |
| author_facet | Bahareh Nikmehr Riyadh Al-Ameri |
| author_sort | Bahareh Nikmehr |
| collection | DOAJ |
| description | Geopolymer concrete (GC) has the potential to incorporate recycled concrete aggregates (RCA) obtained from construction and demolition waste. This research aims to review the current state-of-the-art knowledge of the RCA in GC and identify the existing knowledge gaps for future research direction. This paper highlights the essential factors that impact the GC’s mechanical and durability properties. Moreover, the influence of various percentages of coarse and fine RCA and the pattern of their replacement will be assessed. The effect of aluminosilicate material, alkaline activators, and curing regime also will be evaluated. Besides, the durability-related characteristics of this concrete will be analysed. The impact of exposure to a higher temperature, freeze–thaw cycles, marine environment, and acid and alkali attack will be comprehensively reviewed. A literature review revealed that increasing alumina silicate content, such as slag and metakaolin, and increasing the Na<sub>2</sub>SiO<sub>3</sub>/NaOH ratio and alkali-activator-to-binder ratio improve the hardened GC. However, increasing slag and metakaolin content and the Na<sub>2</sub>SiO<sub>3</sub>/NaOH ratio has an adverse impact on its workability. Therefore, finding the optimum mix design for using RCA in GC is vital. Moreover, there is a scope for developing a self-compacting GC cured at ambient temperature using RCA. |
| first_indexed | 2024-03-09T03:54:55Z |
| format | Article |
| id | doaj.art-c4cf7fc047ef42a6bd5fc6dc4ff736a7 |
| institution | Directory Open Access Journal |
| issn | 2313-4321 |
| language | English |
| last_indexed | 2024-03-09T03:54:55Z |
| publishDate | 2022-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Recycling |
| spelling | doaj.art-c4cf7fc047ef42a6bd5fc6dc4ff736a72023-12-03T14:22:34ZengMDPI AGRecycling2313-43212022-07-01745110.3390/recycling7040051A State-of-the-Art Review on the Incorporation of Recycled Concrete Aggregates in Geopolymer ConcreteBahareh Nikmehr0Riyadh Al-Ameri1School of Engineering, Deakin University, Geelong, VIC 3216, AustraliaSchool of Engineering, Deakin University, Geelong, VIC 3216, AustraliaGeopolymer concrete (GC) has the potential to incorporate recycled concrete aggregates (RCA) obtained from construction and demolition waste. This research aims to review the current state-of-the-art knowledge of the RCA in GC and identify the existing knowledge gaps for future research direction. This paper highlights the essential factors that impact the GC’s mechanical and durability properties. Moreover, the influence of various percentages of coarse and fine RCA and the pattern of their replacement will be assessed. The effect of aluminosilicate material, alkaline activators, and curing regime also will be evaluated. Besides, the durability-related characteristics of this concrete will be analysed. The impact of exposure to a higher temperature, freeze–thaw cycles, marine environment, and acid and alkali attack will be comprehensively reviewed. A literature review revealed that increasing alumina silicate content, such as slag and metakaolin, and increasing the Na<sub>2</sub>SiO<sub>3</sub>/NaOH ratio and alkali-activator-to-binder ratio improve the hardened GC. However, increasing slag and metakaolin content and the Na<sub>2</sub>SiO<sub>3</sub>/NaOH ratio has an adverse impact on its workability. Therefore, finding the optimum mix design for using RCA in GC is vital. Moreover, there is a scope for developing a self-compacting GC cured at ambient temperature using RCA.https://www.mdpi.com/2313-4321/7/4/51geopolymer concreterecycled concrete aggregatescrushed concreteconstruction and demolition waste (CDW)mechanical properties of fresh and hardened GCdurability |
| spellingShingle | Bahareh Nikmehr Riyadh Al-Ameri A State-of-the-Art Review on the Incorporation of Recycled Concrete Aggregates in Geopolymer Concrete Recycling geopolymer concrete recycled concrete aggregates crushed concrete construction and demolition waste (CDW) mechanical properties of fresh and hardened GC durability |
| title | A State-of-the-Art Review on the Incorporation of Recycled Concrete Aggregates in Geopolymer Concrete |
| title_full | A State-of-the-Art Review on the Incorporation of Recycled Concrete Aggregates in Geopolymer Concrete |
| title_fullStr | A State-of-the-Art Review on the Incorporation of Recycled Concrete Aggregates in Geopolymer Concrete |
| title_full_unstemmed | A State-of-the-Art Review on the Incorporation of Recycled Concrete Aggregates in Geopolymer Concrete |
| title_short | A State-of-the-Art Review on the Incorporation of Recycled Concrete Aggregates in Geopolymer Concrete |
| title_sort | state of the art review on the incorporation of recycled concrete aggregates in geopolymer concrete |
| topic | geopolymer concrete recycled concrete aggregates crushed concrete construction and demolition waste (CDW) mechanical properties of fresh and hardened GC durability |
| url | https://www.mdpi.com/2313-4321/7/4/51 |
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