The Role of Microstructure in Alkali–Silica Reaction Tests
Alkali–silica reactions were set off in cementitious mortars in different curing conditions, simulating short-term tests on reactivity. The investigated composites differed in some of their microstructural features. The total open porosity was modulated by changing the water/cement ratio and also by...
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| Format: | Article |
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MDPI AG
2022-05-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/12/5/646 |
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| author | Andrea Saccani Stefania Manzi |
| author_facet | Andrea Saccani Stefania Manzi |
| author_sort | Andrea Saccani |
| collection | DOAJ |
| description | Alkali–silica reactions were set off in cementitious mortars in different curing conditions, simulating short-term tests on reactivity. The investigated composites differed in some of their microstructural features. The total open porosity was modulated by changing the water/cement ratio and also by adding an air-entraining additive. By keeping the mortars’ porosity as the only variable, the effect on the measured expansion was evaluated. The dependence on porosity, specifically on the microstructure, of the macroscopic expansion that was used to assess the reactivity of the aggregates was studied. In particular, the connectivity of the porous network in the material, which is the dimension of the most frequent capillary porosity, exerts an influence on the expansion rate and extent. The results obtained under different conditions underline that the microstructure, that is the porosity of a composite and its size, always plays an important role in influencing the extent of expansion, a role that should be investigated and analyzed more deeply in accelerated procedures. |
| first_indexed | 2024-03-10T03:04:44Z |
| format | Article |
| id | doaj.art-4e2c3e32a671472b99533d16306abf13 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-10T03:04:44Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-4e2c3e32a671472b99533d16306abf132023-11-23T10:34:54ZengMDPI AGCrystals2073-43522022-05-0112564610.3390/cryst12050646The Role of Microstructure in Alkali–Silica Reaction TestsAndrea Saccani0Stefania Manzi1Department of Civil, Chemical, Environmental and Material Engineering, University of Bologna, Via Terracini 28, 40131 Bologna, ItalyDepartment of Civil, Chemical, Environmental and Material Engineering, University of Bologna, Via Terracini 28, 40131 Bologna, ItalyAlkali–silica reactions were set off in cementitious mortars in different curing conditions, simulating short-term tests on reactivity. The investigated composites differed in some of their microstructural features. The total open porosity was modulated by changing the water/cement ratio and also by adding an air-entraining additive. By keeping the mortars’ porosity as the only variable, the effect on the measured expansion was evaluated. The dependence on porosity, specifically on the microstructure, of the macroscopic expansion that was used to assess the reactivity of the aggregates was studied. In particular, the connectivity of the porous network in the material, which is the dimension of the most frequent capillary porosity, exerts an influence on the expansion rate and extent. The results obtained under different conditions underline that the microstructure, that is the porosity of a composite and its size, always plays an important role in influencing the extent of expansion, a role that should be investigated and analyzed more deeply in accelerated procedures.https://www.mdpi.com/2073-4352/12/5/646alkali–silica reactivityaccelerated testmicrostructureporositywater/binder ratioaggregates |
| spellingShingle | Andrea Saccani Stefania Manzi The Role of Microstructure in Alkali–Silica Reaction Tests Crystals alkali–silica reactivity accelerated test microstructure porosity water/binder ratio aggregates |
| title | The Role of Microstructure in Alkali–Silica Reaction Tests |
| title_full | The Role of Microstructure in Alkali–Silica Reaction Tests |
| title_fullStr | The Role of Microstructure in Alkali–Silica Reaction Tests |
| title_full_unstemmed | The Role of Microstructure in Alkali–Silica Reaction Tests |
| title_short | The Role of Microstructure in Alkali–Silica Reaction Tests |
| title_sort | role of microstructure in alkali silica reaction tests |
| topic | alkali–silica reactivity accelerated test microstructure porosity water/binder ratio aggregates |
| url | https://www.mdpi.com/2073-4352/12/5/646 |
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