Publicação
Measurement of internal moisture distribution in concrete with relative humidity sensors
| Resumo: | The moisture content in concrete is closely related with its structural behaviour. The cement hydration process is the main responsible for the strength growth development and for heat generation, which in turn induces volumetric changes. Furthermore, the drying process of concrete creates tensile stresses that could lead to an initial stress state build-up and limit the concrete ability to carry further tensile stresses, or generate cracks during service life operating conditions. This is an issue that has been subject of attention of recent design codes but still a lot of research has to be developed to fully understand this behaviour. This is due to the enormous variations that may occur on the concrete compositions and on the in-situ environmental conditions, which makes difficult to predict the actual shrinkage deformations and the role of humidity on it. On this regard, the study of shrinkage, cracking, moisture loss, thermal deformations and the evolution of the mechanical properties in concrete since casting and throughout the service life are a crucial issue in order to predict the structural behaviour of concrete. The scope of the present research work is to approach the understanding of the concrete moisture loss process and to contribute with the lack of information in this domain. Different methods of moisture loss measurements inside concrete have been explored but the focus is through relative humidity measurements. On this regard, the use of different RH sensors and the definition of appropriate monitoring techniques with reasonable accuracy, repeatability and cost-efficiency have been studied. To achieve this, preliminary experiments have to be done to determine the reliability of the measurements and ensure the accurate conditions for the project development. This includes environmental conditions (achieve constant relative humidity environments), sensor and monitoring systems tests, experimental set up with accurate procedures and preliminary measurements in concrete specimens. |
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| Autores principais: | Padilla Quincot, Gonzalo |
| Assunto: | Relative humidity Humidity sensors Concrete Monitoring Internal moisture distribution Humidade relativa Sensores de humidade Betão Monitorização Distribução interna do conteúdo da humidade |
| Ano: | 2012 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | The moisture content in concrete is closely related with its structural behaviour. The cement hydration process is the main responsible for the strength growth development and for heat generation, which in turn induces volumetric changes. Furthermore, the drying process of concrete creates tensile stresses that could lead to an initial stress state build-up and limit the concrete ability to carry further tensile stresses, or generate cracks during service life operating conditions. This is an issue that has been subject of attention of recent design codes but still a lot of research has to be developed to fully understand this behaviour. This is due to the enormous variations that may occur on the concrete compositions and on the in-situ environmental conditions, which makes difficult to predict the actual shrinkage deformations and the role of humidity on it. On this regard, the study of shrinkage, cracking, moisture loss, thermal deformations and the evolution of the mechanical properties in concrete since casting and throughout the service life are a crucial issue in order to predict the structural behaviour of concrete. The scope of the present research work is to approach the understanding of the concrete moisture loss process and to contribute with the lack of information in this domain. Different methods of moisture loss measurements inside concrete have been explored but the focus is through relative humidity measurements. On this regard, the use of different RH sensors and the definition of appropriate monitoring techniques with reasonable accuracy, repeatability and cost-efficiency have been studied. To achieve this, preliminary experiments have to be done to determine the reliability of the measurements and ensure the accurate conditions for the project development. This includes environmental conditions (achieve constant relative humidity environments), sensor and monitoring systems tests, experimental set up with accurate procedures and preliminary measurements in concrete specimens. |
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