Impact of Aggregate Grain Size on ASR-Induced Expansion
Alkali–silica reaction (ASR) is a sequence of complex chemical processes, resulting in the formation of alkali silica gels with high swelling ability. ASR leads to the expansion of concrete and the degradation of its microstructure. The susceptibility of aggregates to alkali reaction depends, among...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-12-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/16/24/7506 |
| _version_ | 1797380190993645568 |
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| author | Justyna Zapała-Sławeta |
| author_facet | Justyna Zapała-Sławeta |
| author_sort | Justyna Zapała-Sławeta |
| collection | DOAJ |
| description | Alkali–silica reaction (ASR) is a sequence of complex chemical processes, resulting in the formation of alkali silica gels with high swelling ability. ASR leads to the expansion of concrete and the degradation of its microstructure. The susceptibility of aggregates to alkali reaction depends, among other factors, on the type and origin of the aggregate, the presence of reactive forms of silica, the mineral composition, and the geometric properties of the aggregate, such as shape and grain size. This study aimed to investigate the impact of the grain size of polymineral post-glacial gravel aggregate, originating from the northern regions of Poland, on its susceptibility to ASR. The expansion of mortars made from polymineral aggregate and the cracking of grains and cement matrix due to the occurring reactions were analyzed. Based on the conducted research, it was observed that the expansion of mortars depends on the grain size of the aggregate. It was demonstrated that the fraction of reactive aggregate generating the most significant elongation of mortars is in the range of 1.0–2.0 mm. The reaction of silica with alkalis continued until the depletion of reactive components in the aggregate. The relationship between the progress of corrosive processes and the grain size of the aggregate was evident in the form of different linear elongation increments of mortars over time. The expansion of mortars was caused by the swelling ASR gel, inducing stress in the grain and the surrounding cementitious paste. |
| first_indexed | 2024-03-08T20:34:43Z |
| format | Article |
| id | doaj.art-52ae2a13a0cb4ebab6a72e89c1cfa04b |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-08T20:34:43Z |
| publishDate | 2023-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-52ae2a13a0cb4ebab6a72e89c1cfa04b2023-12-22T14:22:28ZengMDPI AGMaterials1996-19442023-12-011624750610.3390/ma16247506Impact of Aggregate Grain Size on ASR-Induced ExpansionJustyna Zapała-Sławeta0Faculty of Civil Engineering and Architecture, Kielce University of Technology, Al. Tysiąclecia Państwa Polskiego 7, 25-314 Kielce, PolandAlkali–silica reaction (ASR) is a sequence of complex chemical processes, resulting in the formation of alkali silica gels with high swelling ability. ASR leads to the expansion of concrete and the degradation of its microstructure. The susceptibility of aggregates to alkali reaction depends, among other factors, on the type and origin of the aggregate, the presence of reactive forms of silica, the mineral composition, and the geometric properties of the aggregate, such as shape and grain size. This study aimed to investigate the impact of the grain size of polymineral post-glacial gravel aggregate, originating from the northern regions of Poland, on its susceptibility to ASR. The expansion of mortars made from polymineral aggregate and the cracking of grains and cement matrix due to the occurring reactions were analyzed. Based on the conducted research, it was observed that the expansion of mortars depends on the grain size of the aggregate. It was demonstrated that the fraction of reactive aggregate generating the most significant elongation of mortars is in the range of 1.0–2.0 mm. The reaction of silica with alkalis continued until the depletion of reactive components in the aggregate. The relationship between the progress of corrosive processes and the grain size of the aggregate was evident in the form of different linear elongation increments of mortars over time. The expansion of mortars was caused by the swelling ASR gel, inducing stress in the grain and the surrounding cementitious paste.https://www.mdpi.com/1996-1944/16/24/7506alkali–silica reactionreactive aggregategrain sizecorrosionASR gelmicrostructure degradation |
| spellingShingle | Justyna Zapała-Sławeta Impact of Aggregate Grain Size on ASR-Induced Expansion Materials alkali–silica reaction reactive aggregate grain size corrosion ASR gel microstructure degradation |
| title | Impact of Aggregate Grain Size on ASR-Induced Expansion |
| title_full | Impact of Aggregate Grain Size on ASR-Induced Expansion |
| title_fullStr | Impact of Aggregate Grain Size on ASR-Induced Expansion |
| title_full_unstemmed | Impact of Aggregate Grain Size on ASR-Induced Expansion |
| title_short | Impact of Aggregate Grain Size on ASR-Induced Expansion |
| title_sort | impact of aggregate grain size on asr induced expansion |
| topic | alkali–silica reaction reactive aggregate grain size corrosion ASR gel microstructure degradation |
| url | https://www.mdpi.com/1996-1944/16/24/7506 |
| work_keys_str_mv | AT justynazapałasławeta impactofaggregategrainsizeonasrinducedexpansion |