SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures最新文献

{"title":"Comparison Between Demand Of Superplasticizer of Admixture and and Strength Development of High Performance Concrete With Silica Fume and Residual Rice-Husk Ash","authors":"S. Santos, L. Prudêncio, G. Gava","doi":"10.14359/5587","DOIUrl":"https://doi.org/10.14359/5587","url":null,"abstract":"The use of high reactivity pozzolanas, such as silica fume in portland cement concrete, has increased significantly in the last two decades owing to improved resistance and durability of the concrete incorporating these materials. These properties were achieved through increased density of the cement paste generated by the micro-filler effect and pozzolanic reactions with calcium hydroxide liberated in hydration reactions of cement compounds. However, this beneficial effect on concrete properties involves a considerable cost increase due to the large use of superplasticizers necessary to confer the desired workability to concrete mixtures. A recently studied alternative pozzolana is rice-husk ash, which has been shown to present a performance compatible to that of silica fume, once it is produced under controlled conditions. Nevertheless, recent research in Brazil has shown that even residual rice-husk ash (a by-product of the cereal husk burning for energy production) presents excellent performances as a pozzolana. As part of that researth, this work has been carried out in order to compare silica fume performance with that of residual rice-husk ash in high-performance concrete. Both the demand of a superplasticizer admixture and strength development were investigated against a control concrete (without pozzolana). Three water/cementitious materials (keeping constant the absolute volume of cementitious materials) were studied. Residual rice-husk ash has been demonstrated to be a highly reactive pozzolana, ready for use in the production of high-performance concrete, and requiring less superplasticizer admixture than the concrete with silica fume. As to performance evaluation, concrete mixtures with silica fume showed greater strengths than other concretes. However, the results have shown an increase in residual rice-husk ash concrete strength from the 28th day on, reaching strength values close to those of silica fume at 90 days, an indication that the performance of both pozzolanas may be the same at later ages.","PeriodicalId":299049,"journal":{"name":"SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130318846","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":"Phsico Mechanical Properties of High-Performance Concrete","authors":"A. Dimaio, G. Giaccio, R. Zerbino","doi":"10.14359/5561","DOIUrl":"https://doi.org/10.14359/5561","url":null,"abstract":"","PeriodicalId":299049,"journal":{"name":"SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127994802","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":"Mechanical Properties and Durability of High- Performance Concrete","authors":"R. Silveira, J. Calixto, J. T. Fontoura","doi":"10.14359/5583","DOIUrl":"https://doi.org/10.14359/5583","url":null,"abstract":"The results of an experimental investigation on the mechanical properties and durability of high performance concrete are presented. The concrete was produced with two types of cement, two different aggregates (shingle and granite) and addition of silica fume. The compressive and splitting tensile strength as well as the secant modulus of elasticity were evaluated on concrete having compressive strength up to 90 MPa and ages from 16 hours to 91 days. The complete stress-strain curve in compression was obtained at 28 days in a strain controlled mode. The durability tests include abrasion resistance, water permeability and carbonation depth. The results indicate that the mechanical properties investigated have different developments with respect to time. They also show expressively the efffects of the different coarse aggregates on the secant modulus of elasticity. The analysis of the test data additionally demonstrates significant reduction in water permeability, porosity and water absorption of high-performance concrete as well as a greater abrasion resistance. High-performance concrete also proved to be more resistant to carbonation even under poor curing conditions, and higher carbon dioxide concentations.","PeriodicalId":299049,"journal":{"name":"SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123500860","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":"Performance of Fiber Reinforced Lightweight and Normal Weight in Simulated Marine Environment","authors":"C. Ong, T. Bremner, T. Holm, S. R. Boyd","doi":"10.14359/5563","DOIUrl":"https://doi.org/10.14359/5563","url":null,"abstract":"Results of an experimental investigation on the performance of cracked fiber reinforced concrete in a simulated marine environment are presented. A total of 111 prismatic specimens (150x150x510 mm) comprising both lightweight and normal weight concretes were used in this investigation. Cracked specimens with crack sizes of \"hairline\", 0.25 mm, 1.0 mm, and uncracked specimens were exposed in either simulated seawater for up to a period of 7 years or 5300 alternate wetting and drying cycles. It was found, for both lightweight and normal weight concrete, that the strength development of uncracked specimens is not hampered by alternate wetting and drying. At the end of 7 years exposure, compressive strength gain of 90% was observed over the seven day moist cured strength for both types of concrete. Corresponding uncracked prismatic specimens showed approximately 25% flexural strength gain; however their post-cracking strength decreased under a prolonged period of alternate wetting and drying. Precracked specimens with cracks of up to 0.25 mm showed improvement in load carying capacity up to 1440 wetting and drying cycles. However, specimens with cracks of 1.0 mm showed a reduction in load carrying capacity.","PeriodicalId":299049,"journal":{"name":"SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121705314","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":"Water Permeability Study of High-Performance Concrete","authors":"J. Sebe, J. Calixto","doi":"10.14359/5585","DOIUrl":"https://doi.org/10.14359/5585","url":null,"abstract":"The results of an experimental investigation on the water permeability of high performance concrete are presented. Several aspects were studied including different components for the concrete as well as the load history for the test specimens. The concrete was made with Brazilian Type CP V ARI cement (ASTM Type III), two different aggregates (limestone and gneiss) and silica fume. The concrete compressive strength was above 50 MPa at 28 days. For the water permeability test, the apparatus developed by Ludirdja et al. at the University of Illinois was employed. Permeability tests were initiated 10 days after casting the concrete. At that time, the test specimens were subjected to different load histories. In series 1, the applied load was equal to 40% of the ultimate compressive strength, while in series 2 this value was increased to 70%. The secant modulus of elasticity and the splitting tensile strength of the concretes at the start of the permeability tests were also evaluated. The test results indicate clearly the effects of the load history on the value of the water permeability coefficient. As the load increases, the value of this coefficient also increases. The results also show that for high-performance concrete produced with Brazilian Type CP V ARI cement, the prescribed compressive strength may be reached in a short period of time, but the long-term water permeability coefficient seems to require a longer time to develop.","PeriodicalId":299049,"journal":{"name":"SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130467195","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":"Behavior of High-Strength Concrete","authors":"R. Scott, S. Hamil, P. Baglin","doi":"10.14359/5586","DOIUrl":"https://doi.org/10.14359/5586","url":null,"abstract":"","PeriodicalId":299049,"journal":{"name":"SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130288717","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":"Studies on High-Performance High-Strength Concrete (HPHSC) Columns","authors":"B. Rangan","doi":"10.14359/5589","DOIUrl":"https://doi.org/10.14359/5589","url":null,"abstract":"High Performance High Strength Concrete (HPHSC) has been utilized in columns and in other compression members. The author and his research team at Curtin University have conducted significant research into the behavior and strength of HPHSC columns for the last eight years. The research comprised extensive experimental work and analytical calculations. Numerous column specimens have been tested in combined axial compression and uniaxial (single and double curvature) bending or biaxial bending. Analytical methods have been developed to predict the response and strength of test columns. Based on the research, various proposals for design have been formulated. The paper describes the salient features of this research.","PeriodicalId":299049,"journal":{"name":"SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116624658","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":"Performance of Polyolefin Fiber ReinforcedConcrete Under Cyclic Loading","authors":"Ramakrishnan, C. Sivakumar","doi":"10.14359/5555","DOIUrl":"https://doi.org/10.14359/5555","url":null,"abstract":"In structures, such as bridges, bridge-deck overlays, pavements, offshore structures, parts of high-rise buildings and crane-girders in the industrial buildings, which are subject to cyclic loading and dynamic loading, the flexural fatigue strength and endurance limit of concrete are important design parameters. Most modern building codes concentrate on providing sufficient ductility in a structure to prevent its collapse during a major seismic event. Structures may be deformed beyond the elastic limit in order to absorb all of the energy imparted to them. In such cases ductility, the ability of the structure to undergo increasing deformations beyond yield stresses while still sustaining gravity and other loads, is therefore necessary in order to prevent catastrophic collapse. Non-metallic fiber reinforced concrete represents a potential solution. The behavior of non-metallic fiber reinforced concrete under cyclic loading needs to be studied. This paper presents the results of an experimental and analytical investigation to determine the flexural fatigue strength and endurance limit of non-metallic (polyolefin) fiber reinforced concrete. Six different polyolefin FRC mixes with varying compressive strengths were investigated. The FRC beams were subjected to flexural fatigue with third point loading at a frequency of 25 load cycles per second. It was found that polyolefin fiber reinforced concrete reaches an endurance limit at about two million cycles. The fatigue life model (S-N curve) was more accurate when presented on a log-log scale than on a log-normal scale. Statistical and probabilistic concepts are introduced to predict the flexural fatigue model and the fatigue life expectancy of the composite.","PeriodicalId":299049,"journal":{"name":"SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128870757","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":"Axially Loaded High-Performance Concrete Columns With Steel Fibers","authors":"A. Guimarães, J. S. Giongo, T. Takeya","doi":"10.14359/5572","DOIUrl":"https://doi.org/10.14359/5572","url":null,"abstract":"High-performance concrete (HPC) has been studied extensively at many research centres, because of its increasing use in reinforced concrete buildings. Since HPC is a brittle material, studies have been done to increase its ductility. Increases in longitudinal and/or transverse steel ratios can improve the ductility of HPC elements. The addition of fibres also increases the deformability and thus the ductility. Hence the transverse steel ratio can be reduced by using fibres. This paper presents a study of axially loaded columns made with high-performance concrete containing steel fibres. The average compressive strength of the concrete was 80 MPa. The volumetric ratios of fibres were: 0.25%, 0.50% and 1.00%, and the stirrup ratios were 0.55% and 0.82%. The longitudinal steel ratio was the same for all columns tests, the W/C was 0.37, 10% silica fume was added and it was also necessary to use about 3% superplasticizer to improve workability. A comparison was made between the results for columns in high-strength concrete with and without fibres. It was observed that only the cross-sectional core effectively contributed to the load capacity of the columns.","PeriodicalId":299049,"journal":{"name":"SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128066425","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":"Bond Influence on Rotation Capacity of High-Strength and and Normal Strength Beams","authors":"I. Shehata, L. A. Ventorini, L. Shehata","doi":"10.14359/5559","DOIUrl":"https://doi.org/10.14359/5559","url":null,"abstract":"","PeriodicalId":299049,"journal":{"name":"SP-186: High-Performance Concrete: Performance and Quality of Concrete Structures","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129947599","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}