Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Quantitative damage estimation of concrete core based on AE rate process analysis
Damage of concrete is quantitatively estimated by applying acoustic emission (AE) measurement and damage mechanics. Concrete samples of controlled damage due to accelerated carbonation are examined to confirm an applicability of damage estimation in the uniaxial compression test. AE activities under compression is analyzed, on the basis of the rate process theory. Using Loland's model in damage mechanics, a relationship between stress and strain is modeled. The database on a correlation between AE rate and the damage parameter is updated, and relative damages of concrete samples are quantified. Results are in remarkable agreement with actual damages of controlled samples. Applying the database, relative damages of core samples taken from a buried pipeline are estimated. Conclusions are summarized below. 1) AE behavior in concrete is dependent on the damage, and could be approximated by applying the rate process analysis. Loland's model could approximate the relation between stress and strain, and the applicability of the damage parameter in the model is confirmed. 2) Based on the correlation between the decrease of Young's modulus and the rate 'a', Young's modulus of intact concrete is successfully evaluated. As the ratio to the initial tangential Young's modulus, the relative damage of concrete can be estimated. 3) Using the database, it is demonstrated that Young's modulus of intact concrete is calculated from a small number of core samples taken from existing structures. Though the degrees of damage in the concrete samples are not quantitatively identified only from the strengths, they were quite comparable to the relative damages. The degree of damage is clearly identified as the relative damage by AE measurement.
Quantitative damage estimation of concrete core based on AE rate process analysis
Damage of concrete is quantitatively estimated by applying acoustic emission (AE) measurement and damage mechanics. Concrete samples of controlled damage due to accelerated carbonation are examined to confirm an applicability of damage estimation in the uniaxial compression test. AE activities under compression is analyzed, on the basis of the rate process theory. Using Loland's model in damage mechanics, a relationship between stress and strain is modeled. The database on a correlation between AE rate and the damage parameter is updated, and relative damages of concrete samples are quantified. Results are in remarkable agreement with actual damages of controlled samples. Applying the database, relative damages of core samples taken from a buried pipeline are estimated. Conclusions are summarized below. 1) AE behavior in concrete is dependent on the damage, and could be approximated by applying the rate process analysis. Loland's model could approximate the relation between stress and strain, and the applicability of the damage parameter in the model is confirmed. 2) Based on the correlation between the decrease of Young's modulus and the rate 'a', Young's modulus of intact concrete is successfully evaluated. As the ratio to the initial tangential Young's modulus, the relative damage of concrete can be estimated. 3) Using the database, it is demonstrated that Young's modulus of intact concrete is calculated from a small number of core samples taken from existing structures. Though the degrees of damage in the concrete samples are not quantitatively identified only from the strengths, they were quite comparable to the relative damages. The degree of damage is clearly identified as the relative damage by AE measurement.
Quantitative damage estimation of concrete core based on AE rate process analysis
Quantitative Schadensabschätzung von Betonkernen mittels Prozessanalyse der Schallemissionsrate
Ohtsu, M. (Autor:in) / Suzuki, T. (Autor:in)
2004
8 Seiten, 6 Bilder, 2 Tabellen, 10 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
Quantitative Damage Estimation of Concrete Core based on AE Rate Process Analysis
| British Library Conference Proceedings | 2004
Damage Mechanics for Core Concrete by AE Rate Process
| British Library Conference Proceedings | 2002
Damage Mechanics for Core Concrete by AE Rate Process
| British Library Conference Proceedings | 2002