Design of High Volume CFBC Fly Ash Based Calcium Sulphoaluminate Type Binder in Mixtures with Ordinary Portland Cement
Growing concerns on global industrial greenhouse gas emissions have boosted research for developing alternative, less CO<sub>2</sub> intensive binders for partial to complete replacement of ordinary Portland cement (OPC) clinker. Unlike slag and pozzolanic siliceous low-Ca class F fly as...
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| Format: | Article |
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MDPI AG
2021-10-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/14/19/5798 |
| _version_ | 1797516052184170496 |
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| author | Peeter Paaver Oliver Järvik Kalle Kirsimäe |
| author_facet | Peeter Paaver Oliver Järvik Kalle Kirsimäe |
| author_sort | Peeter Paaver |
| collection | DOAJ |
| description | Growing concerns on global industrial greenhouse gas emissions have boosted research for developing alternative, less CO<sub>2</sub> intensive binders for partial to complete replacement of ordinary Portland cement (OPC) clinker. Unlike slag and pozzolanic siliceous low-Ca class F fly ashes, the Ca- and S-rich class C ashes, particularly these formed in circulating fluidised bed combustion (CFBC) boilers, are typically not considered as viable cementitious materials for blending with or substituting the OPC. We studied the physical, chemical-mineralogical characteristics of the mechanically activated Ca-rich CFBC fly ash pastes and mortars with high volume OPC substitution rates to find potential alternatives for OPC in building materials and composites. Our findings indicate that compressive strength of pastes and mortars made with partial to complete replacement of the mechanically activated CFBC ash to OPC is comparable to OPC concrete, showing compared to OPC pastes reduction in compressive strength only by <10% at 50% and <20% at 75% replacement rates. Our results show that mechanically activated Ca-rich CFBC fly ash can be successfully used as an alternative CSA-cement type binder. |
| first_indexed | 2024-03-10T06:55:55Z |
| format | Article |
| id | doaj.art-52462b3ec3e84d259efeafdd1843be16 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T06:55:55Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-52462b3ec3e84d259efeafdd1843be162023-11-22T16:27:18ZengMDPI AGMaterials1996-19442021-10-011419579810.3390/ma14195798Design of High Volume CFBC Fly Ash Based Calcium Sulphoaluminate Type Binder in Mixtures with Ordinary Portland CementPeeter Paaver0Oliver Järvik1Kalle Kirsimäe2Department of Geology, Institute of Ecology and Earth Sciences, University of Tartu, Ravila 14A, 50411 Tartu, EstoniaDepartment of Energy Technology, Tallinn University of Technology, Ehitajate tee5, 19086 Tallinn, EstoniaDepartment of Geology, Institute of Ecology and Earth Sciences, University of Tartu, Ravila 14A, 50411 Tartu, EstoniaGrowing concerns on global industrial greenhouse gas emissions have boosted research for developing alternative, less CO<sub>2</sub> intensive binders for partial to complete replacement of ordinary Portland cement (OPC) clinker. Unlike slag and pozzolanic siliceous low-Ca class F fly ashes, the Ca- and S-rich class C ashes, particularly these formed in circulating fluidised bed combustion (CFBC) boilers, are typically not considered as viable cementitious materials for blending with or substituting the OPC. We studied the physical, chemical-mineralogical characteristics of the mechanically activated Ca-rich CFBC fly ash pastes and mortars with high volume OPC substitution rates to find potential alternatives for OPC in building materials and composites. Our findings indicate that compressive strength of pastes and mortars made with partial to complete replacement of the mechanically activated CFBC ash to OPC is comparable to OPC concrete, showing compared to OPC pastes reduction in compressive strength only by <10% at 50% and <20% at 75% replacement rates. Our results show that mechanically activated Ca-rich CFBC fly ash can be successfully used as an alternative CSA-cement type binder.https://www.mdpi.com/1996-1944/14/19/5798fly ash grindingcompressive strengthettringitecalcium sulphoaluminate cementwaste utilisation |
| spellingShingle | Peeter Paaver Oliver Järvik Kalle Kirsimäe Design of High Volume CFBC Fly Ash Based Calcium Sulphoaluminate Type Binder in Mixtures with Ordinary Portland Cement Materials fly ash grinding compressive strength ettringite calcium sulphoaluminate cement waste utilisation |
| title | Design of High Volume CFBC Fly Ash Based Calcium Sulphoaluminate Type Binder in Mixtures with Ordinary Portland Cement |
| title_full | Design of High Volume CFBC Fly Ash Based Calcium Sulphoaluminate Type Binder in Mixtures with Ordinary Portland Cement |
| title_fullStr | Design of High Volume CFBC Fly Ash Based Calcium Sulphoaluminate Type Binder in Mixtures with Ordinary Portland Cement |
| title_full_unstemmed | Design of High Volume CFBC Fly Ash Based Calcium Sulphoaluminate Type Binder in Mixtures with Ordinary Portland Cement |
| title_short | Design of High Volume CFBC Fly Ash Based Calcium Sulphoaluminate Type Binder in Mixtures with Ordinary Portland Cement |
| title_sort | design of high volume cfbc fly ash based calcium sulphoaluminate type binder in mixtures with ordinary portland cement |
| topic | fly ash grinding compressive strength ettringite calcium sulphoaluminate cement waste utilisation |
| url | https://www.mdpi.com/1996-1944/14/19/5798 |
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