SP-253: Fifth ACI/CANMET/IBRACON Int'l Conference on High-Performance Concrete Structures & Materials最新文献_第3页

Durability of Concrete Vaults for Radioactive Waste Disposal 放射性废物处置用混凝土拱顶的耐久性

SP-253: Fifth ACI/CANMET/IBRACON Int'l Conference on High-Performance Concrete Structures & Materials Pub Date : 2008-07-31 DOI: 10.14359/20163

G. Duffó, E. A. Arva, S. Farina, C. Giordano, C. Lafon

{"title":"Durability of Concrete Vaults for Radioactive Waste Disposal","authors":"G. Duffó, E. A. Arva, S. Farina, C. Giordano, C. Lafon","doi":"10.14359/20163","DOIUrl":"https://doi.org/10.14359/20163","url":null,"abstract":"The development of a program for the design and construction of a facility for the final disposal of intermediate-level radioactive wastes in the Argentine Republic is the responsibility of the Atomic Energy Commission (CNEA). The proposed model is the near-surface monolithic repository similar to that in operation in El Cabril, Spain. The design of this type of repository is based on the use of multiple, independent, and redundant barriers. Since the vault and cover are made of reinforced concrete and they are major components of the engineered barriers, the durability of these concrete structures is an important aspect for the facilities’ integrity. This paper presents a laboratory and field investigation performed during the last 6 years on reinforced concrete specimens made with high-performance concrete, in order to predict the service life of the intermediate-level radioactive waste disposal vaults from data obtained from electrochemical techniques. The development of corrosion sensors that allow on-line measurements of reinforcing steel corrosion potential and corrosion current density, incoming oxygen flow that reaches the metal surface, concrete electrical resistivity, chloride concentration, and internal concrete temperature is shown. These sensors, properly embedded in a prototype of the vault, allow the monitoring of the corrosion process of the reinforcing steel embedded in the structure. All the information obtained from the sensors is being used for the final design of the container to achieve a service life greater than the foreseen durability for this type of facilities (more than 300 years).","PeriodicalId":410288,"journal":{"name":"SP-253: Fifth ACI/CANMET/IBRACON Int'l Conference on High-Performance Concrete Structures & Materials","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126536373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

The Galvanic Effect of the Anodic/ Cathodic Area Ratio on Reinforced Concrete with 304 Stainless Steel 304不锈钢钢筋混凝土阳极/阴极面积比的电效应

SP-253: Fifth ACI/CANMET/IBRACON Int'l Conference on High-Performance Concrete Structures & Materials Pub Date : 2006-06-30 DOI: 10.14359/20186

M. Córdova, P. Castro-Borges

引用次数: 0

Analysis of the Flexural Behavior of Precast Prestressed Beams with Semi-Rigid Connections 半刚性连接预制预应力梁的抗弯性能分析

SP-253: Fifth ACI/CANMET/IBRACON Int'l Conference on High-Performance Concrete Structures & Materials Pub Date : 1900-01-01 DOI: 10.14359/20177

Bruna Catoia, M. Ferreira, R. Carvalho, T. Catoia

{"title":"Analysis of the Flexural Behavior of Precast Prestressed Beams with Semi-Rigid Connections","authors":"Bruna Catoia, M. Ferreira, R. Carvalho, T. Catoia","doi":"10.14359/20177","DOIUrl":"https://doi.org/10.14359/20177","url":null,"abstract":"This paper describes how the flexural behavior of precast concrete beams is strongly influenced by their end connections. These connections can be considered as zones of discontinuity within the precast structure, wherein stress concentrations occur. Depending on the connection efficiency in terms of mobilizing displacements and transferring forces, there will be a correlative redistribution of the internal forces throughout the precast structure. This paper deals with the study of the behavior of precast prestressed beams with semi-rigid connections, wherein analytical procedures considering the interaction between moment-curvature relation of the precast beam and the moment-rotation relation of its beam-column connections have been proposed and experimentally validated. By using these procedures, equations based on the fixity factor of the connections were combined with experimental results, allowing the integration between the stiffness of the beam and the rotational stiffness of the beam-column connections. Within the experimental methodology, flexural tests of prestressed beams were conducted, considering both pinned and semi-rigid connections. Therefore, it has been possible to evaluate the effect of semi-rigid connections on the flexural behavior of the precast beam, in which deflections, rotations, and curvature of the semi-rigidly connected beam were compared with equivalent parameters from the flexural test of the simply supported beam, in order to estimate the partially restrained moment at the beam ends. This approach provided accurate results for the partially restrained moments at the beam ends, indicating that the beam supports were semi-rigid. Based in the experimental results of the studied model, the effective partially restrained end moment considering ULS has been estimated between 60% and 70% of the full restrained moment.","PeriodicalId":410288,"journal":{"name":"SP-253: Fifth ACI/CANMET/IBRACON Int'l Conference on High-Performance Concrete Structures & Materials","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125420375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Physicomechanical Properties and Durability of Structural Colored Concrete 结构彩色混凝土的物理力学性能和耐久性

SP-253: Fifth ACI/CANMET/IBRACON Int'l Conference on High-Performance Concrete Structures & Materials Pub Date : 1900-01-01 DOI: 10.14359/20175

M. Positieri, P. Helene

引用次数: 2

The Effectiveness of Measuring Flexural Performance of Fiber-Reinforced Concrete using the ASTM C1399-02 Test Method 使用ASTM C1399-02测试方法测量纤维增强混凝土弯曲性能的有效性

SP-253: Fifth ACI/CANMET/IBRACON Int'l Conference on High-Performance Concrete Structures & Materials Pub Date : 1900-01-01 DOI: 10.14359/20170

G. Gava, L. Prudêncio

引用次数: 0

SP-253: Fifth ACI/CANMET/IBRACON Int'l Conference on High-Performance Concrete Structures &amp; Materials最新文献

SP-253: Fifth ACI/CANMET/IBRACON Int'l Conference on High-Performance Concrete Structures & Materials最新文献