Presented is an experimental investigation on the effect of polyvinyl alcohol (PVA) polymer modified alkali resistance (AR) glass fiber reinforced cementitious composites. Series of tensile and flexural tests were performed to evaluate the performance of alkali resistant glass fibers in blended cementitious matrix. Specimens with different amounts of PVA polymer were tested, and specimens under dry air and moist curing environment were compared. Test results are discussed and analyzed.
{"title":"PVA Polymer Modified Glass Fiber Reinforced Cementitious Composites","authors":"Zongjin Li, A. C. P. Liu, C. Leung","doi":"10.14359/12265","DOIUrl":"https://doi.org/10.14359/12265","url":null,"abstract":"Presented is an experimental investigation on the effect of polyvinyl alcohol (PVA) polymer modified alkali resistance (AR) glass fiber reinforced cementitious composites. Series of tensile and flexural tests were performed to evaluate the performance of alkali resistant glass fibers in blended cementitious matrix. Specimens with different amounts of PVA polymer were tested, and specimens under dry air and moist curing environment were compared. Test results are discussed and analyzed.","PeriodicalId":265574,"journal":{"name":"SP-206: Concrete: Material Science to Application - A Tribute to Surendra P. Shah","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126982559","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}
This paper presents experimentally evaluated behavior of high performance fiber reinforced concrete (HPFRC) members that exhibit features particularly desirable for increasing earthquake resistance such as high tensile strength and ductility. The seismic response of a four story high performance composite frame (HPCF) building is investigated analytically and compared to that of a seismically designed reinforced concrete frame. HPCF reached an overall good seismic response. As compared to the reference building, it exhibited slower strength and stiffness degradation, lower top displacement and story drifts.
{"title":"Development and Seismic Behavior of High-Performance Composite Frames","authors":"N. Krstulovic-Opara, Kilar","doi":"10.14359/12269","DOIUrl":"https://doi.org/10.14359/12269","url":null,"abstract":"This paper presents experimentally evaluated behavior of high performance fiber reinforced concrete (HPFRC) members that exhibit features particularly desirable for increasing earthquake resistance such as high tensile strength and ductility. The seismic response of a four story high performance composite frame (HPCF) building is investigated analytically and compared to that of a seismically designed reinforced concrete frame. HPCF reached an overall good seismic response. As compared to the reference building, it exhibited slower strength and stiffness degradation, lower top displacement and story drifts.","PeriodicalId":265574,"journal":{"name":"SP-206: Concrete: Material Science to Application - A Tribute to Surendra P. Shah","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127725169","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}
The paper presents the results of a study of bond tests performed to evaluate the bond strength and mechanical behavior of the interface between substrate and repair materials. Slabs made of conventional concrete were cast and cured in ambient laboratory environment; the substrate surface was roughened with jackhammers; and the repair materials were cast by shotcreting or cast by hand. Direct tensile and compression tests were performed after 2 and 6 months to evaluate the bond strength and mechanical behavior of the interface between substrate and repair materials. Paper provides test results.
{"title":"Mechanical Behavior of the Interface Between Substrate and Repair Material","authors":"P. Paramasivam, K. Ong, W. Xu","doi":"10.14359/12246","DOIUrl":"https://doi.org/10.14359/12246","url":null,"abstract":"The paper presents the results of a study of bond tests performed to evaluate the bond strength and mechanical behavior of the interface between substrate and repair materials. Slabs made of conventional concrete were cast and cured in ambient laboratory environment; the substrate surface was roughened with jackhammers; and the repair materials were cast by shotcreting or cast by hand. Direct tensile and compression tests were performed after 2 and 6 months to evaluate the bond strength and mechanical behavior of the interface between substrate and repair materials. Paper provides test results.","PeriodicalId":265574,"journal":{"name":"SP-206: Concrete: Material Science to Application - A Tribute to Surendra P. Shah","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126208974","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}
Shrinkage is an important consideration in structural design for serviceability and crack width limits. The ability to design concretes with significantly lower shrinkage is, therefore, of great practical importance. This paper analyzes some of the new shrinkage reducing admixtures (SRA) that have been developed to reduce the extent of shrinkage strains. Specifically, the unrestrained or free shrinkage deformation of concrete incorporating two SRAs based on polypropylene glycol formulations are evaluated over a drying period of seven months. Additionally, the effectiveness of a product based on a wax formulation is studied. Companion tests on two base concretes without SRA have also been performed.
{"title":"Study of the Behavior of Concrete with shrinkage Reducing Admixtures Subjected to Long-Term Drying","authors":"R. Gettu, J. Roncero, Miguel A. Martín","doi":"10.14359/12251","DOIUrl":"https://doi.org/10.14359/12251","url":null,"abstract":"Shrinkage is an important consideration in structural design for serviceability and crack width limits. The ability to design concretes with significantly lower shrinkage is, therefore, of great practical importance. This paper analyzes some of the new shrinkage reducing admixtures (SRA) that have been developed to reduce the extent of shrinkage strains. Specifically, the unrestrained or free shrinkage deformation of concrete incorporating two SRAs based on polypropylene glycol formulations are evaluated over a drying period of seven months. Additionally, the effectiveness of a product based on a wax formulation is studied. Companion tests on two base concretes without SRA have also been performed.","PeriodicalId":265574,"journal":{"name":"SP-206: Concrete: Material Science to Application - A Tribute to Surendra P. Shah","volume":"761 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132935397","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}
{"title":"Concrete for Freshmen","authors":"E. Landis, W. Manion","doi":"10.14359/12273","DOIUrl":"https://doi.org/10.14359/12273","url":null,"abstract":"","PeriodicalId":265574,"journal":{"name":"SP-206: Concrete: Material Science to Application - A Tribute to Surendra P. Shah","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130752542","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}
The paper describes the Tufts University's School of Engineering program to introduce teamwork to engineering students. The program is designed to develop good habits for functioning as part of a team. Overviews of the five fundamental skills program and teamwork initiative are presented.
{"title":"Improving Effectiveness of Research in the Classroom Through Teamwork","authors":"Daniel Jansen","doi":"10.14359/12275","DOIUrl":"https://doi.org/10.14359/12275","url":null,"abstract":"The paper describes the Tufts University's School of Engineering program to introduce teamwork to engineering students. The program is designed to develop good habits for functioning as part of a team. Overviews of the five fundamental skills program and teamwork initiative are presented.","PeriodicalId":265574,"journal":{"name":"SP-206: Concrete: Material Science to Application - A Tribute to Surendra P. Shah","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127517176","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}
The addition of small amounts of fiber reinforcement is an alternative for producing high strength concrete with significantly improved durability that industry is demanding. Carbon fiber reinforced concrete in particular has shown to have excellent durability properties due to the fiber's high resistance to wear, heat and corrosion. This paper presents the results of some fundamental investigations on the bulk electrical properties of carbon fiber cement composites under compressive loading. The resistance behavior was evaluated for various fiber volume contents, and the effects of taking resistance measurements both parallel and perpendicular to the axis of loading were investigated.
{"title":"Electrical Resistance of Carbon Fiber Cement Composites Under Compression","authors":"Farhad Reza, G. Batson, J. Yamamuro, J. Lee","doi":"10.14359/12267","DOIUrl":"https://doi.org/10.14359/12267","url":null,"abstract":"The addition of small amounts of fiber reinforcement is an alternative for producing high strength concrete with significantly improved durability that industry is demanding. Carbon fiber reinforced concrete in particular has shown to have excellent durability properties due to the fiber's high resistance to wear, heat and corrosion. This paper presents the results of some fundamental investigations on the bulk electrical properties of carbon fiber cement composites under compressive loading. The resistance behavior was evaluated for various fiber volume contents, and the effects of taking resistance measurements both parallel and perpendicular to the axis of loading were investigated.","PeriodicalId":265574,"journal":{"name":"SP-206: Concrete: Material Science to Application - A Tribute to Surendra P. Shah","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130182717","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}
Paper presents a review of some of the Australian code developments in the design of concrete structures. Topics such as shear design of beams, deflection control, punching shear strength of slabs and shear strength of walls are discussed.
{"title":"Some Australian Code Developments in the Design of Concrete Structures","authors":"B. Rangan","doi":"10.14359/12249","DOIUrl":"https://doi.org/10.14359/12249","url":null,"abstract":"Paper presents a review of some of the Australian code developments in the design of concrete structures. Topics such as shear design of beams, deflection control, punching shear strength of slabs and shear strength of walls are discussed.","PeriodicalId":265574,"journal":{"name":"SP-206: Concrete: Material Science to Application - A Tribute to Surendra P. Shah","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129101340","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}
Synopsis: The United States is a country known for its wasteful use of natural resources. Efforts to correct the results of past transgressions as well as to balance economic development against legitimate concerns of conservation are pervading almost all aspects of life, including the construction industry. Concrete, being the most widely used material worldwide, is a natural target for conservation of natural resources. The cement industry is a major producer of greenhouse gases and energy user. Recent research has led to the point where numerous by-products of industrial processes with pozzolanic properties can be substituted partially for cement, such as fly ash and ground granulated blast furnace slag. Also other recycled materials are finding increased application in concrete production. For example, recycled concrete has been used successfully in numerous projects, and crushed waste glass is now available as a valuable source of aggregate, since the problem of alkali-silicate reaction has been solved. The key to commercial success is beneficiation, i.e. the targeted utilization of specific properties of the recycled material, which adds value to the end product.
{"title":"Concrete and Sustainable Development","authors":"C. Meyer","doi":"10.14359/12272","DOIUrl":"https://doi.org/10.14359/12272","url":null,"abstract":"Synopsis: The United States is a country known for its wasteful use of natural resources. Efforts to correct the results of past transgressions as well as to balance economic development against legitimate concerns of conservation are pervading almost all aspects of life, including the construction industry. Concrete, being the most widely used material worldwide, is a natural target for conservation of natural resources. The cement industry is a major producer of greenhouse gases and energy user. Recent research has led to the point where numerous by-products of industrial processes with pozzolanic properties can be substituted partially for cement, such as fly ash and ground granulated blast furnace slag. Also other recycled materials are finding increased application in concrete production. For example, recycled concrete has been used successfully in numerous projects, and crushed waste glass is now available as a valuable source of aggregate, since the problem of alkali-silicate reaction has been solved. The key to commercial success is beneficiation, i.e. the targeted utilization of specific properties of the recycled material, which adds value to the end product.","PeriodicalId":265574,"journal":{"name":"SP-206: Concrete: Material Science to Application - A Tribute to Surendra P. Shah","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126912135","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}
A newly developed powerful version of microplane model, labeled model M4, is used to study two basic phenomena in fracturing concrete: the vertex effect, i.e., the tangential stiffness for loading increments to the side of previous radial loading path in the stress space, and the effect of confinement by a steel tube or a spiral on the suppression of softening response of columns. Comparisons with the tests show the microplane model to predict the initial torsional stiffness very closely, while the classical tensorial models with invariants overpredict this stiffness several times. In the tests performed recently, steel tubes of different thicknesses filled by concrete are squashed to about half of their initial length and very large strains with shear angles up to about 70 degree are achieved. Observations and conclusions from the investigations are provided.
{"title":"Vertex Effect and Confinement of Fracturing Concrete Via Microplane Model M4","authors":"Z. Bažant, F. Caner, J. Červenka","doi":"10.14359/12271","DOIUrl":"https://doi.org/10.14359/12271","url":null,"abstract":"A newly developed powerful version of microplane model, labeled model M4, is used to study two basic phenomena in fracturing concrete: the vertex effect, i.e., the tangential stiffness for loading increments to the side of previous radial loading path in the stress space, and the effect of confinement by a steel tube or a spiral on the suppression of softening response of columns. Comparisons with the tests show the microplane model to predict the initial torsional stiffness very closely, while the classical tensorial models with invariants overpredict this stiffness several times. In the tests performed recently, steel tubes of different thicknesses filled by concrete are squashed to about half of their initial length and very large strains with shear angles up to about 70 degree are achieved. Observations and conclusions from the investigations are provided.","PeriodicalId":265574,"journal":{"name":"SP-206: Concrete: Material Science to Application - A Tribute to Surendra P. Shah","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121747907","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}
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