Sustainable mortar with waste glass fine aggregates and pond ash as an alkali-silica reaction suppressor
The construction industry seeks sustainable alternatives to conventional materials, with numerous waste types currently destined for landfills offering potential for repurposing. This study examines the replacement of natural sand with crushed waste glass and using pond ash as a supplementary cement...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-07-01
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| Series: | Case Studies in Construction Materials |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509525000683 |
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| author | W.C.V. Fernando W. Lokuge H. Wang C. Gunasekara K. Dhasindrakrishna |
| author_facet | W.C.V. Fernando W. Lokuge H. Wang C. Gunasekara K. Dhasindrakrishna |
| author_sort | W.C.V. Fernando |
| collection | DOAJ |
| description | The construction industry seeks sustainable alternatives to conventional materials, with numerous waste types currently destined for landfills offering potential for repurposing. This study examines the replacement of natural sand with crushed waste glass and using pond ash as a supplementary cementitious material in mortar, with a particular focus on mitigating alkali-silica reaction (ASR) and assessing compressive strength. Fly ash, widely recognised for its ASR suppression capabilities, is becoming less available due to the decline in coal-fired power generation, necessitating the exploration of pond ash as a viable alternative. However, given the prolonged storage of pond ash in repositories, its direct substitution for fly ash necessitates thorough investigation. Hence, microstructural and chemical analyses are conducted to investigate the underlying reaction mechanisms. The strength results show that glass can replace natural sand with minimal impact on compressive strength up to 60 %, beyond which strength decreases by 11 % at 100 % glass. However, the ASR expansion results indicate that using more than 20 % glass could lead to long-term detrimental effects. Nevertheless, pond ash effectively mitigates ASR, keeping expansions below 0.1 % at a 10 % OPC replacement, although it performs slightly less efficiently than fly ash. At 20 % replacement, pond ash performs similarly to fly ash. Pond ash outperforms fly ash in 28-day strength up to a 20 % OPC replacement and shows better strength development. The optimal balance between ASR mitigation and compressive strength is achieved with 20 % pond ash, allowing for higher glass utilisation without increasing the risk of ASR. |
| format | Article |
| id | doaj-art-136fec904c334fc591211aaf1dcb3e6f |
| institution | Kabale University |
| issn | 2214-5095 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj-art-136fec904c334fc591211aaf1dcb3e6f2025-01-22T05:41:55ZengElsevierCase Studies in Construction Materials2214-50952025-07-0122e04269Sustainable mortar with waste glass fine aggregates and pond ash as an alkali-silica reaction suppressorW.C.V. Fernando0W. Lokuge1H. Wang2C. Gunasekara3K. Dhasindrakrishna4School of Engineering, Centre for Future Materials, University of Southern Queensland, Springfield, QLD 4300, Australia; Corresponding author.School of Engineering, Centre for Future Materials, University of Southern Queensland, Springfield, QLD 4300, AustraliaSchool of Engineering, Centre for Future Materials, University of Southern Queensland, Springfield, QLD 4300, AustraliaCivil and Infrastructure Engineering, School of Engineering, RMIT University, 124, La Trobe Street, Melbourne, Victoria 3000, AustraliaSchool of Engineering, Centre for Future Materials, University of Southern Queensland, Springfield, QLD 4300, AustraliaThe construction industry seeks sustainable alternatives to conventional materials, with numerous waste types currently destined for landfills offering potential for repurposing. This study examines the replacement of natural sand with crushed waste glass and using pond ash as a supplementary cementitious material in mortar, with a particular focus on mitigating alkali-silica reaction (ASR) and assessing compressive strength. Fly ash, widely recognised for its ASR suppression capabilities, is becoming less available due to the decline in coal-fired power generation, necessitating the exploration of pond ash as a viable alternative. However, given the prolonged storage of pond ash in repositories, its direct substitution for fly ash necessitates thorough investigation. Hence, microstructural and chemical analyses are conducted to investigate the underlying reaction mechanisms. The strength results show that glass can replace natural sand with minimal impact on compressive strength up to 60 %, beyond which strength decreases by 11 % at 100 % glass. However, the ASR expansion results indicate that using more than 20 % glass could lead to long-term detrimental effects. Nevertheless, pond ash effectively mitigates ASR, keeping expansions below 0.1 % at a 10 % OPC replacement, although it performs slightly less efficiently than fly ash. At 20 % replacement, pond ash performs similarly to fly ash. Pond ash outperforms fly ash in 28-day strength up to a 20 % OPC replacement and shows better strength development. The optimal balance between ASR mitigation and compressive strength is achieved with 20 % pond ash, allowing for higher glass utilisation without increasing the risk of ASR.http://www.sciencedirect.com/science/article/pii/S2214509525000683Recycled glassFine aggregatePond ashSupplementary cementitious materialAlkali-Silica Reaction |
| spellingShingle | W.C.V. Fernando W. Lokuge H. Wang C. Gunasekara K. Dhasindrakrishna Sustainable mortar with waste glass fine aggregates and pond ash as an alkali-silica reaction suppressor Case Studies in Construction Materials Recycled glass Fine aggregate Pond ash Supplementary cementitious material Alkali-Silica Reaction |
| title | Sustainable mortar with waste glass fine aggregates and pond ash as an alkali-silica reaction suppressor |
| title_full | Sustainable mortar with waste glass fine aggregates and pond ash as an alkali-silica reaction suppressor |
| title_fullStr | Sustainable mortar with waste glass fine aggregates and pond ash as an alkali-silica reaction suppressor |
| title_full_unstemmed | Sustainable mortar with waste glass fine aggregates and pond ash as an alkali-silica reaction suppressor |
| title_short | Sustainable mortar with waste glass fine aggregates and pond ash as an alkali-silica reaction suppressor |
| title_sort | sustainable mortar with waste glass fine aggregates and pond ash as an alkali silica reaction suppressor |
| topic | Recycled glass Fine aggregate Pond ash Supplementary cementitious material Alkali-Silica Reaction |
| url | http://www.sciencedirect.com/science/article/pii/S2214509525000683 |
| work_keys_str_mv | AT wcvfernando sustainablemortarwithwasteglassfineaggregatesandpondashasanalkalisilicareactionsuppressor AT wlokuge sustainablemortarwithwasteglassfineaggregatesandpondashasanalkalisilicareactionsuppressor AT hwang sustainablemortarwithwasteglassfineaggregatesandpondashasanalkalisilicareactionsuppressor AT cgunasekara sustainablemortarwithwasteglassfineaggregatesandpondashasanalkalisilicareactionsuppressor AT kdhasindrakrishna sustainablemortarwithwasteglassfineaggregatesandpondashasanalkalisilicareactionsuppressor |