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A Study of the Corrosion Resistance of Thermal Sprayed Stainless Steel Coatings for Reinforcing Bars 钢筋用热喷涂不锈钢涂层的耐腐蚀性能研究
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6107
P. Gu, B. Arsenault, J. Beaudoin, J. Legoux, B. Harvey, J. Fournier
{"title":"A Study of the Corrosion Resistance of Thermal Sprayed Stainless Steel Coatings for Reinforcing Bars","authors":"P. Gu, B. Arsenault, J. Beaudoin, J. Legoux, B. Harvey, J. Fournier","doi":"10.14359/6107","DOIUrl":"https://doi.org/10.14359/6107","url":null,"abstract":"The potential for using stainless steel coatings to protect steel reinforcing bars from corrosion especially in a salt contaminated concrete environment was evaluated. Type 304, 316 and 420 stainless steel coated coupons and reinforcing bars were prepared using the Twin-Wire Electric Arc (TWEA) and High Pressure/High Velocity Oxygen-Fuel (HP/HVOF) processes. Metallographic examinations were conducted to determine the coating density and the oxide content. The corrosion resistance of the coatings was evaluated using linear polarization and salt spray techniques. The oxide content of the coating in the TWEA process can be significantly reduced using argon or nitrogen as primary and arc jet gases. This did not have a significant effect on porosity of the coating.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127994342","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
Performance Characteristics of Concrete Incorporating A Natural Amorphous Silica 掺入天然无定形二氧化硅的混凝土的性能特征
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6101
D. Chisholm
{"title":"Performance Characteristics of Concrete Incorporating A Natural Amorphous Silica","authors":"D. Chisholm","doi":"10.14359/6101","DOIUrl":"https://doi.org/10.14359/6101","url":null,"abstract":"A natural amorphous silica with a purity of approximately 90 percent is mined from an extensive geothermal deposit near Rotorua, New Zealand. After refining and processing to remove impurities, the 'Microsilica 600tm' has properties which comply with Australian Standard AS 3582 Part 3 'Silica Fume' as a supplementary cementitious material for use with portland cement. The performance characteristics of concrete incorporating the 'Microsilica 600' were evaluated at two cement levels of 320 and 400 kg/cubic meter and two silica addition levels of 7 and 10 percent. Properties evaluated were compressive strength, tensile strength, concrete shrinkage, sulfate resistance, resistance against chemical attack, abrasion resistance, and chloride permeability. Performance improvement compared favorably with published data on concretes incorporating processed 'conventional' silica fume.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121450221","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: 3
Performance Characteristics and Applications of High-Performance Polyolefin Fiber Reinforced Concretes 高性能聚烯烃纤维增强混凝土的性能特点及应用
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6122
V. Ramakrishnan
{"title":"Performance Characteristics and Applications of High-Performance Polyolefin Fiber Reinforced Concretes","authors":"V. Ramakrishnan","doi":"10.14359/6122","DOIUrl":"https://doi.org/10.14359/6122","url":null,"abstract":"This paper presents the performance characteristics of a newly developed polyolefin fiber-reinforced concrete. The polyolefin fibers were used for the first time for a full-depth pavement, a thin bridge-deck overlay, a jersey barrier, white-topping on scarified asphalt pavement, and a full-depth bridge deck slab. An attempt is made to assess, evaluate and appreciate the behavior of the polyolefin fiber-reinforced concrete. The performance of fresh concretes and the properties of hardened concretes with and without fibers are compared. A comparison is also made between the non-metallic polyolefin fiber-reinforced concrete and steel fiber-reinforced concrete. The test program on fresh concrete included: slump, concrete properties included: compressive strength, static modulus, modulus of rupture, load-deflection curves, first crack toughness strength and post crack behavior, ASTM toughness indices, Japanese toughness index, equivalent flexural strength, fatigue strength and impact strength.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122536108","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
Deicing Salt Scaling Resistance of High-Strength Concrete 高强混凝土除冰盐抗结垢性研究
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6120
J. Stark, N. Chelouah
{"title":"Deicing Salt Scaling Resistance of High-Strength Concrete","authors":"J. Stark, N. Chelouah","doi":"10.14359/6120","DOIUrl":"https://doi.org/10.14359/6120","url":null,"abstract":"Deicing salt scaling resistance of high-strength concrete with a water-cement ratio < or = 0.40 remains clearly under the CDF (Capillary Suction of Deicing Chemicals and Freeze-Thaw Test) acceptance criterion of 1,500 g/square meters after 28 freezing and thawing cycles even if no air-entrainment is used. It was confirmed by investigations that a high-strength concrete without air-entrainment and with a low water-cement ratio and consequently almost no capillary pores may have a very high freeze-deicing salt resistance. The effect of phase transformations in hydrated cement under freeze-deicing salt attack which is practically harmless in air-entrained concretes should, however, be taken into consideration when dealing with high-strength concretes without air-entrainment.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"295 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123090083","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
Reinforcement Corrosion in New Zealand Concrete 新西兰混凝土中的钢筋腐蚀
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6108
S. Freitag, S. Bruce, W. Hickman
{"title":"Reinforcement Corrosion in New Zealand Concrete","authors":"S. Freitag, S. Bruce, W. Hickman","doi":"10.14359/6108","DOIUrl":"https://doi.org/10.14359/6108","url":null,"abstract":"Corroding reinforcement is the most common form of deterioration in reinforced concrete structures in New Zealand. The first part of the paper describes the causes, extent and severity of rebar corrosion in New Zealand concretes as revealed by the systematic inspection of several hundred structures since the early 1980s. The second part of the paper discusses local approaches to inspection, maintenance and repair of affected structures. The third part describes research currently being carried out by the authors to reduce the risk of future rebar corrosion in new construction and in concrete repairs. These research programs include investigations of the effectiveness of coatings for reinforcement, different methods of cleaning contaminated steel, and different cement/binder combinations in preventing further corrosion.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123296355","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
A New Generation of Structural Lightweight Concrete 新一代结构轻量化混凝土
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6116
O. A. Kayyali, M. N. Haque
{"title":"A New Generation of Structural Lightweight Concrete","authors":"O. A. Kayyali, M. N. Haque","doi":"10.14359/6116","DOIUrl":"https://doi.org/10.14359/6116","url":null,"abstract":"Two types of lightweight concrete were investigated. The first was made with polystyrene beads and blast furnace slag aggregate. The second type of concrete investigated was made from sintered fly ash aggregate as a total replacement of both coarse and fine aggregate. This concrete yielded a dry density of about 1790 kg/cubic meter and a compressive strength above 70 MPa, and values for the moduli of rupture and elasticity of 5.5 MPa and 21 GPa respectively. The stress-strain relationship of this concrete is a straight line until very near to failure thus underlining its brittle nature. The shrinkage values for this concrete are lower than normal weight concrete and this is attributed mainly to the excellent bond capability and to the high absorptive capacity of the aggregate. Addition of fly ash as a partial replacement of fines was beneficial in eliminating segregaton and increasing workability and cohesion of the fresh concrete.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127482300","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: 29
Mixture Proportioning of Roller Compacted Concrete-A Review 碾压混凝土配合比研究综述
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6111
J. Marchand, R. Gagné, É. Ouellet, S. Lepage
{"title":"Mixture Proportioning of Roller Compacted Concrete-A Review","authors":"J. Marchand, R. Gagné, É. Ouellet, S. Lepage","doi":"10.14359/6111","DOIUrl":"https://doi.org/10.14359/6111","url":null,"abstract":"The development of the roller-compacted concrete (RCC) technology in the 1980s is considered by many as a significant breakthrough in the construction industry. RCC is now commonly used all around the world for the construction of dams and pavements, and for the rehabilitation of existing structures. A critical review of the recent developments in the mixture proportioning of RCC is presented. Discussions include a brief description of each existing method. Special emphasis is placed on recent innovations based on the optimum paste volume and optimum packing density concepts. Each method is evaluated on the basis of its ability to yield cost-effective RCC mixtures with optimum workability, permeability and mechanical properties. The influence of various parameters, such as the use of supplementary cementing materials, mineral fillers and air entrainment is discussed.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129916304","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: 41
In-Situ Permeability Testing-A Basis for Service Life Prediction 原位渗透率测试——寿命预测的基础
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6121
A. Long, P. Basheer, F. R. Montgomery
{"title":"In-Situ Permeability Testing-A Basis for Service Life Prediction","authors":"A. Long, P. Basheer, F. R. Montgomery","doi":"10.14359/6121","DOIUrl":"https://doi.org/10.14359/6121","url":null,"abstract":"The premature deterioration of concrete structures is a major problem in many countries across the world and this has prompted the search for a method of predicting service life. In this paper, based on a holistic model relating permeability to durability the experience gained from the use of the \"AUTOCLAM\" permeability test, which is convenient and easy to use on site as well as in the laboratory, is presented. Details are included of a laboratory study correlating the \"AUTOCLAM\" permeation properties with the results of carbonation and freezing and thawing tests. In addition, the results of a field study on a motorway bridge are given. It is concluded that in-situ permeability and strength testing can be used to develop durability based design criteria for concrete, and to assess the remaining life of existing structures.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123129281","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: 4
Development of Super-Workable Concrete with Viscosity Agent for Reconstruction of Jetty Structures Destroyed by the Hanshin Great Earthquake 阪神大地震破坏的防波堤结构重建用粘度剂超工作混凝土的研制
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6105
T. Fukute, H. Hamada, S. Sano, E. Sueoka, A. Moriwake, H. Takeuchi
{"title":"Development of Super-Workable Concrete with Viscosity Agent for Reconstruction of Jetty Structures Destroyed by the Hanshin Great Earthquake","authors":"T. Fukute, H. Hamada, S. Sano, E. Sueoka, A. Moriwake, H. Takeuchi","doi":"10.14359/6105","DOIUrl":"https://doi.org/10.14359/6105","url":null,"abstract":"Jetty structures were constructed at Kobe Port as part of the reconstruction project after Hanshin Great Earthquake in 1995. In this jetty structure, straight and oblique base piles were jointed with a precast slab in the field to shorten the work period. This paper presents the results of experiments carried out in a laboratory, the full scale filling test using a super workable concrete applied to the joints of structure, and the concrete quality. Super workable concrete containing a viscosity agent, gypsum, and ground granulated blast-furnace slag was used to satisfy the requirements for its high filling ability, minimized bleeding, and reduced shrinkage. Super workable concrete was produced and placed from a concrete plant ship in this construction.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131084590","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
Wall Panels From Air-Entrained Ash Slag Concrete 含气灰渣混凝土墙板
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6103
S. Pavlenko
{"title":"Wall Panels From Air-Entrained Ash Slag Concrete","authors":"S. Pavlenko","doi":"10.14359/6103","DOIUrl":"https://doi.org/10.14359/6103","url":null,"abstract":"The department of civil engineering of the Siberian State Academy for Mining and Metallurgy (SSAMM) together with Tom-Usinsk Precast Works have developed compositions and technology for producing a lightweight concrete based on ash and slag from Tom-Usinsk power plant. The concrete can be used for external wall panels as a replacement for claydite concrete. The ash slag blend from hydrodumps of the power plant contains 33 percent ash, 52 percent slag sand with a particle size of 0.14 to 5 mm and 15 percent slag with a particle size of 5 to 10 mm. The blend meets the requirements of Russia Standard 25592-91 for use in concretes as an aggregate. Average density of the concrete mixture was in the range of 1070 to 1150 kg/cubic meter before placing and 1100 to 1200 kg/cubic meter after placing, compacting and heat treatment, the coefficient of heat conductivity of the light-weight concrete was in the range of 180 to 250 W/m degrees Centigrade depending on average density and strength. The thickness of wall panels produced from this concrete could be reduced to 400 mm without any warm coating. The cost of 1 cubic meter of external wall panels produced from the concrete is 30 percent lower than that of panels made from claydite concrete.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125324937","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
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