Modelling of Alkali Silica Reaction in concrete structures for rehabilitation intervention
A number of hydraulic structures such as dams and hydro-power plants in the world and in particular, in South Africa which have been designed and built during the last decades, have been subjected to material deterioration due to Alkali Silica Reaction (ASR). ASR is a deleterious chemical reaction b...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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EDP Sciences
2018-01-01
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| Series: | MATEC Web of Conferences |
| Online Access: | https://doi.org/10.1051/matecconf/201819903007 |
| _version_ | 1818556172479758336 |
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| author | Pourbehi Mohammad S. van Zijl G.P.A.G. Strasheim J.A.v.B. |
| author_facet | Pourbehi Mohammad S. van Zijl G.P.A.G. Strasheim J.A.v.B. |
| author_sort | Pourbehi Mohammad S. |
| collection | DOAJ |
| description | A number of hydraulic structures such as dams and hydro-power plants in the world and in particular, in South Africa which have been designed and built during the last decades, have been subjected to material deterioration due to Alkali Silica Reaction (ASR). ASR is a deleterious chemical reaction between the alkalis in Portland cement paste and certain amorphous silica found in various types of natural aggregates which usually results in material degradation and structural distress such as expansion of the structure, cracking, presence of gel, discoloration and pop outs of the reacting particles near the surface of the concrete. Also, suitable environmental conditions (temperature and relative humidity) play a vital role in the initiation and advancement of ASR. In this study a chemo-thermo-mechanical model is developed to predict the structural expansion, degradation of mechanical properties, cracks and damage in concrete structures affected by ASR. Parameters such as temperature, kinetics of the reaction, confining stresses and material degradation are included in the model. The finite element based model can simulate the temperature field in the structure and the kinetics of the chemical reaction to predict the long-term effects of the ASR on concrete structures including displacement, cracking and damage development. The model is applied to an actual concrete dam subjected to ASR. The results are interpreted, and support the management and evaluation of the remedial measures for repair and maintenance programmes for the affected dams. |
| first_indexed | 2024-12-13T23:43:58Z |
| format | Article |
| id | doaj.art-c23744ffc81d4fbea190fa2bd39720ed |
| institution | Directory Open Access Journal |
| issn | 2261-236X |
| language | English |
| last_indexed | 2024-12-13T23:43:58Z |
| publishDate | 2018-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | MATEC Web of Conferences |
| spelling | doaj.art-c23744ffc81d4fbea190fa2bd39720ed2022-12-21T23:27:05ZengEDP SciencesMATEC Web of Conferences2261-236X2018-01-011990300710.1051/matecconf/201819903007matecconf_iccrrr2018_03007Modelling of Alkali Silica Reaction in concrete structures for rehabilitation interventionPourbehi Mohammad S.0van Zijl G.P.A.G.1Strasheim J.A.v.B.2Division for Structural Engineering and Civil Engineering Informatics, Stellenbosch UniversityDivision for Structural Engineering and Civil Engineering Informatics, Stellenbosch UniversityDivision for Structural Engineering and Civil Engineering Informatics, Stellenbosch UniversityA number of hydraulic structures such as dams and hydro-power plants in the world and in particular, in South Africa which have been designed and built during the last decades, have been subjected to material deterioration due to Alkali Silica Reaction (ASR). ASR is a deleterious chemical reaction between the alkalis in Portland cement paste and certain amorphous silica found in various types of natural aggregates which usually results in material degradation and structural distress such as expansion of the structure, cracking, presence of gel, discoloration and pop outs of the reacting particles near the surface of the concrete. Also, suitable environmental conditions (temperature and relative humidity) play a vital role in the initiation and advancement of ASR. In this study a chemo-thermo-mechanical model is developed to predict the structural expansion, degradation of mechanical properties, cracks and damage in concrete structures affected by ASR. Parameters such as temperature, kinetics of the reaction, confining stresses and material degradation are included in the model. The finite element based model can simulate the temperature field in the structure and the kinetics of the chemical reaction to predict the long-term effects of the ASR on concrete structures including displacement, cracking and damage development. The model is applied to an actual concrete dam subjected to ASR. The results are interpreted, and support the management and evaluation of the remedial measures for repair and maintenance programmes for the affected dams.https://doi.org/10.1051/matecconf/201819903007 |
| spellingShingle | Pourbehi Mohammad S. van Zijl G.P.A.G. Strasheim J.A.v.B. Modelling of Alkali Silica Reaction in concrete structures for rehabilitation intervention MATEC Web of Conferences |
| title | Modelling of Alkali Silica Reaction in concrete structures for rehabilitation intervention |
| title_full | Modelling of Alkali Silica Reaction in concrete structures for rehabilitation intervention |
| title_fullStr | Modelling of Alkali Silica Reaction in concrete structures for rehabilitation intervention |
| title_full_unstemmed | Modelling of Alkali Silica Reaction in concrete structures for rehabilitation intervention |
| title_short | Modelling of Alkali Silica Reaction in concrete structures for rehabilitation intervention |
| title_sort | modelling of alkali silica reaction in concrete structures for rehabilitation intervention |
| url | https://doi.org/10.1051/matecconf/201819903007 |
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