New Zealand pumicite as a precursor in producing alkaline cement with aluminate-based activators
This study investigates the activation of New Zealand pumicite (pumice powder) using sodium aluminate (NaAlO₂) solution, both alone and in combination with 10 M KOH solution, at various weight ratios of 1, 3, and 5, to produce alkali-activated cement. Compressive strength tests and microstructural a...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-12-01
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| Series: | Case Studies in Construction Materials |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509524011598 |
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| author | Roohollah Kalatehjari Elmira Khaksar Najafi Afshin Asadi Martin Brook |
| author_facet | Roohollah Kalatehjari Elmira Khaksar Najafi Afshin Asadi Martin Brook |
| author_sort | Roohollah Kalatehjari |
| collection | DOAJ |
| description | This study investigates the activation of New Zealand pumicite (pumice powder) using sodium aluminate (NaAlO₂) solution, both alone and in combination with 10 M KOH solution, at various weight ratios of 1, 3, and 5, to produce alkali-activated cement. Compressive strength tests and microstructural analyses were conducted to assess the effects of activator/precursor ratios, activator type, aging time, and curing temperature (65°C for 72 hours or room temperature). The internal porosity of the pumicite played a key role in aluminosilicate phase dissolution and mobility, resulting in similar compressive strengths across different ratios. NaAlO₂ alone achieved compressive strengths of 60 MPa and 67 MPa after 4 and 65 days, respectively, while the binary solutions showed reduced strength with increased aging. Room temperature curing required almost three times the aging period to match the 28-day compressive strengths achieved after curing at 65°C for 72 hours. Microstructural analyses revealed that NaAlO₂ solution adjusted the Si/Al ratio, forming high-Al and high-Si gels as well as zeolite-A, underscoring its benefits. This study demonstrates the potential of using locally sourced New Zealand pumicite as a precursor in alkali-activated cement, particularly in regions lacking traditional industrial by-products. |
| format | Article |
| id | doaj-art-5c17e652f2c74375b4e0f322b763e0dd |
| institution | Kabale University |
| issn | 2214-5095 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj-art-5c17e652f2c74375b4e0f322b763e0dd2024-11-22T07:37:13ZengElsevierCase Studies in Construction Materials2214-50952024-12-0121e04008New Zealand pumicite as a precursor in producing alkaline cement with aluminate-based activatorsRoohollah Kalatehjari0Elmira Khaksar Najafi1Afshin Asadi2Martin Brook3Built Environment Engineering Department, School of Future Environments, Auckland University of Technology, Auckland 1010, New Zealand; Correspondence to: Auckland University of Technology, WZ Building, 6 St Paul Street, Auckland 1010, New Zealand.James Watt School of Engineering, University of Glasgow, United KingdomWilton Joubert Consulting Engineers, Auckland, New Zealand; EnvoGeotechnique Ltd., Auckland, New ZealandSchool of Environment, University of Auckland, Auckland 1010, New ZealandThis study investigates the activation of New Zealand pumicite (pumice powder) using sodium aluminate (NaAlO₂) solution, both alone and in combination with 10 M KOH solution, at various weight ratios of 1, 3, and 5, to produce alkali-activated cement. Compressive strength tests and microstructural analyses were conducted to assess the effects of activator/precursor ratios, activator type, aging time, and curing temperature (65°C for 72 hours or room temperature). The internal porosity of the pumicite played a key role in aluminosilicate phase dissolution and mobility, resulting in similar compressive strengths across different ratios. NaAlO₂ alone achieved compressive strengths of 60 MPa and 67 MPa after 4 and 65 days, respectively, while the binary solutions showed reduced strength with increased aging. Room temperature curing required almost three times the aging period to match the 28-day compressive strengths achieved after curing at 65°C for 72 hours. Microstructural analyses revealed that NaAlO₂ solution adjusted the Si/Al ratio, forming high-Al and high-Si gels as well as zeolite-A, underscoring its benefits. This study demonstrates the potential of using locally sourced New Zealand pumicite as a precursor in alkali-activated cement, particularly in regions lacking traditional industrial by-products.http://www.sciencedirect.com/science/article/pii/S2214509524011598New Zealand PumicitePumiceAlkali-Activated CementSodium AluminateMicrostructural Characterisation |
| spellingShingle | Roohollah Kalatehjari Elmira Khaksar Najafi Afshin Asadi Martin Brook New Zealand pumicite as a precursor in producing alkaline cement with aluminate-based activators Case Studies in Construction Materials New Zealand Pumicite Pumice Alkali-Activated Cement Sodium Aluminate Microstructural Characterisation |
| title | New Zealand pumicite as a precursor in producing alkaline cement with aluminate-based activators |
| title_full | New Zealand pumicite as a precursor in producing alkaline cement with aluminate-based activators |
| title_fullStr | New Zealand pumicite as a precursor in producing alkaline cement with aluminate-based activators |
| title_full_unstemmed | New Zealand pumicite as a precursor in producing alkaline cement with aluminate-based activators |
| title_short | New Zealand pumicite as a precursor in producing alkaline cement with aluminate-based activators |
| title_sort | new zealand pumicite as a precursor in producing alkaline cement with aluminate based activators |
| topic | New Zealand Pumicite Pumice Alkali-Activated Cement Sodium Aluminate Microstructural Characterisation |
| url | http://www.sciencedirect.com/science/article/pii/S2214509524011598 |
| work_keys_str_mv | AT roohollahkalatehjari newzealandpumiciteasaprecursorinproducingalkalinecementwithaluminatebasedactivators AT elmirakhaksarnajafi newzealandpumiciteasaprecursorinproducingalkalinecementwithaluminatebasedactivators AT afshinasadi newzealandpumiciteasaprecursorinproducingalkalinecementwithaluminatebasedactivators AT martinbrook newzealandpumiciteasaprecursorinproducingalkalinecementwithaluminatebasedactivators |