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Effect of SiO2/Na2O Ratio on the Fresh and Mechanical Properties of Binary Blend Alkali Activated Mortar Incorporating Copper and Blast Furnace Slags
In recent years, alkali activated concrete technology has gained growing attention due to its potential advantages compared to Portland cement (PC) based concrete, in terms of environmental and economical contribution. Ground granulated blast furnace slag (GGBFS), which is used as a common precursor to produce alkali activated materials (AAMs) is becoming less available compared to the past due to its high consumption. Therefore, the use of alternative precursors such as copper slag (CS) to produce AAMs can be considered as a potential solution. In the present study, the effect of the SiO2/Na2O ratio on the fresh and mechanical properties of slag based alkali activated mortar mixtures incorporating of 50% CS as partial replacement of GGBFS has been studied. A total of three AAM mortar mixtures were produced using three different SiO2/Na2O ratios of 1.0, 1.3 and 1.6, respectively. The flow spread and fresh density of the AAM mixtures were comparable to that of PC based reference mixtures. The flow spread behaviour of the AAMs mixtures was improved slightly (14%) by increasing the molar ratio up to 1.3. Compressive and flexural tensile strength values of within the range 81–86 MPa and 7.8–8.5 MPa, respectively are obtained after 28 days. The strength properties of the mixtures increased and then decreased by increasing the SiO2/Na2O ratio from 1.0 to 1.3 and 1.3 to 1.6, respectively. For the studied binary mixtures and ranges of SiO2/Na2O ratios, the SiO2/Na2O ratio of 1.3 can be considered as an optimum value in terms of strengths properties.
Effect of SiO2/Na2O Ratio on the Fresh and Mechanical Properties of Binary Blend Alkali Activated Mortar Incorporating Copper and Blast Furnace Slags
In recent years, alkali activated concrete technology has gained growing attention due to its potential advantages compared to Portland cement (PC) based concrete, in terms of environmental and economical contribution. Ground granulated blast furnace slag (GGBFS), which is used as a common precursor to produce alkali activated materials (AAMs) is becoming less available compared to the past due to its high consumption. Therefore, the use of alternative precursors such as copper slag (CS) to produce AAMs can be considered as a potential solution. In the present study, the effect of the SiO2/Na2O ratio on the fresh and mechanical properties of slag based alkali activated mortar mixtures incorporating of 50% CS as partial replacement of GGBFS has been studied. A total of three AAM mortar mixtures were produced using three different SiO2/Na2O ratios of 1.0, 1.3 and 1.6, respectively. The flow spread and fresh density of the AAM mixtures were comparable to that of PC based reference mixtures. The flow spread behaviour of the AAMs mixtures was improved slightly (14%) by increasing the molar ratio up to 1.3. Compressive and flexural tensile strength values of within the range 81–86 MPa and 7.8–8.5 MPa, respectively are obtained after 28 days. The strength properties of the mixtures increased and then decreased by increasing the SiO2/Na2O ratio from 1.0 to 1.3 and 1.3 to 1.6, respectively. For the studied binary mixtures and ranges of SiO2/Na2O ratios, the SiO2/Na2O ratio of 1.3 can be considered as an optimum value in terms of strengths properties.
Effect of SiO2/Na2O Ratio on the Fresh and Mechanical Properties of Binary Blend Alkali Activated Mortar Incorporating Copper and Blast Furnace Slags
RILEM Bookseries
Jędrzejewska, Agnieszka (editor) / Kanavaris, Fragkoulis (editor) / Azenha, Miguel (editor) / Benboudjema, Farid (editor) / Schlicke, Dirk (editor) / Ghorbani, Saeid (author) / Petters, Kobe (author) / Matthys, Stijn (author)
International RILEM Conference on Synergising expertise towards sustainability and robustness of CBMs and concrete structures ; 2023 ; Milos Island, Greece
2023-06-09
9 pages
Article/Chapter (Book)
Electronic Resource
English
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