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SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology最新文献

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Role and Regulation of the Transition Zone in Realizing High Performance Concrete 过渡区在实现高性能混凝土中的作用与调控
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6093
H. Uchikawa
{"title":"Role and Regulation of the Transition Zone in Realizing High Performance Concrete","authors":"H. Uchikawa","doi":"10.14359/6093","DOIUrl":"https://doi.org/10.14359/6093","url":null,"abstract":"The transition zone which is formed at the interface between cement paste and aggregate affects decisively the properties of hardened concrete. The transition zone in ordinary concrete consists mainly of a highly porous three dimensional network structure of calcium hydroxide crystals with pores from 50 nm to 2 micrometers in diameter. Its thickness is usually 30 to 40 micrometers. The structure of the transition zone is closely related to the conditions of concrete manufacturing, including composition and structure of materials, proportions and curing conditions. The effects on concrete properties by the formation of the transition zone and the measure to reduce the formation of the transition zone, which causes the deterioration of concrete quality, are also described.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"347 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":"122760651","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
Quality Management Plan for the Confederation Bridge 联邦大桥质量管理计划
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6091
W. Langley, R. Gilmour, J. Turnham, G. Forbes, T. Mostert
{"title":"Quality Management Plan for the Confederation Bridge","authors":"W. Langley, R. Gilmour, J. Turnham, G. Forbes, T. Mostert","doi":"10.14359/6091","DOIUrl":"https://doi.org/10.14359/6091","url":null,"abstract":"This paper presents an overview of the Quality Assurance and Quality Control for the construction of the Confederation Bridge in Eastern Canada. The bridge was unique not only in that it was designed, financed, constructed and operated by the private sector but also in the innovative approach to the design and construction. Private sector partnering with Government was a relatively new concept in Canada, and this project was an excellent of the merits of such ventures. The design life of the Confederation Bridge is 100 years with a target reliability index, Beta, of 4.0. The contractor implemented a rigid Quality Management Plan (QMP) to ensure that the factors which impact on durability and service life were documented and that the specifications were met or exceeded.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"35 18 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":"116657471","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
"Effects of Humic Acid Treatments on Properties of Bamboo Fiber Reinforced, Polymer-Modified Pastes" 腐植酸处理对竹纤维增强聚合物改性浆料性能的影响
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6098
Y. Ohama, K. Demura
{"title":"\"Effects of Humic Acid Treatments on Properties of Bamboo Fiber Reinforced, Polymer-Modified Pastes\"","authors":"Y. Ohama, K. Demura","doi":"10.14359/6098","DOIUrl":"https://doi.org/10.14359/6098","url":null,"abstract":"Bamboo fiber-reinforced polymer-modified pastes using the bamboo fibers treated with humic acid solutions with different humic acid concentrations and a styrene-butadiene rubber latex are prepared with various fiber contents and polymer-cement ratios, and tested for flexural behavior and compressive strength. The flexural deformation, flexural strength, flexural toughness and compressive strength of the humic acid-treated bamboo fiber-reinforced polymer-modified pastes are discussed. The results show that the humic acid treatments of the bamboo fibers cause marked improvements in the flexural behavior after a maximum load, flexural strength and flexural toughness of the bamboo fiber-reinforced polymer-modified pastes.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"19 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":"133352801","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
High-Performance Concrete With Fly Ash 高性能粉煤灰混凝土
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6096
C. Muller, R. Hardtl, Schiessl
{"title":"High-Performance Concrete With Fly Ash","authors":"C. Muller, R. Hardtl, Schiessl","doi":"10.14359/6096","DOIUrl":"https://doi.org/10.14359/6096","url":null,"abstract":"Generally, high-performance concretes can be defined as types of concretes that meet one or more performance requirements in a specific way. Usual concretes are concretes with a compressive strength up to 55 MPa and fly ash contents of around 20 mass percentage relative to the total binding components (c + f). In the production of high-strength concretes (compressive strength > 65 MPa), silica fume has been used usually in order to achieve the expected strengths at low w/c. In the production of mass concretes blast-furnace slag cements with a high percentage of slag are preferred in order to reduce the heat of hydration released by the cement reaction. The objective of the investigations presented in this paper was to produce high-strength and mass concretes with fly ash and to characterize the performance of these concretes. For this purpose, concretes with fly ash contents of 10, 20 and 30 mass percentage relative to (c + f) at w/c between 0.33 and 0.43 are investigated. The properties and the performance of these concretes are presented using the parameters compressive strength and their stress-strain behavior.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"4 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":"131123529","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: 6
"Setting Accelerator Calcium Nitrate Fundamentals, Performance and Applications" 凝固促进剂硝酸钙的基本原理、性能和应用
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6104
H. Justnes, E. Nygaard
{"title":"\"Setting Accelerator Calcium Nitrate Fundamentals, Performance and Applications\"","authors":"H. Justnes, E. Nygaard","doi":"10.14359/6104","DOIUrl":"https://doi.org/10.14359/6104","url":null,"abstract":"The effectivenss of calcium nitrate (CN) as a setting accelerator for cement is dependent on the cement type. The reason for this is explained by the mechanisms for set acceleration, and parameters for predicting the set accelerating efficiency of CN from cement characteristics is pointed out. Performance characteristics such as temperature evolution profile in insulated concrete (i.e., semi-adiabatic) and early compressive strengths (from 8 h) of concretes cured at 20 degrees C for different additions of different soluble calcium salts are demonstrated. The accelerating effect of CN was compared to additions of both calcium acetate and formate on equimolar concentrations of Ca(2+). Calcium acetate and formate gave about the same accelerating effect, while CN showed greater acceleration. Examples are given for field use and potential applications of CN in concrete.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"1 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":"134200407","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: 7
Auckland Basalts as a Source of Alkali in Concrete 奥克兰玄武岩是混凝土中碱的来源
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6109
R. Goguel, N. Milestone
{"title":"Auckland Basalts as a Source of Alkali in Concrete","authors":"R. Goguel, N. Milestone","doi":"10.14359/6109","DOIUrl":"https://doi.org/10.14359/6109","url":null,"abstract":"Chemical leaching techniques based on alkaline complexing solvents were used to determine alkali release from basalts in experimental mortars. Various aggregate grain size fractions from 1 mm to 0.063 mm were incorporated into the experimental mortars. Dissolution kinetics for various cement and aggregate phases in these solvents have been described elsewhere. To allow prediction of the levels of alkali release of a given basalt sample in concrete, a rapid technique of direct leaching of the aggregate, based on the use of 0.3 M lithium hydroxide (LiOH) and 0.3 M tetramethylammonium-hydroxide (TMA-OH), was developed. The basalts were analyzed using hydrofluoric-perchloric acid dissolution and atomic spectrometry (atomic absorption, flame emission, and inductively coupled plasma (ICP) emission spectrometry). X-ray diffraction spectrometry and optical microscopy were used to investigate phase and textural variations between the basalt samples.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"23 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":"134255763","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
Use of Dry Bottom Ash as a Fine Aggregate in Roller Compacted Concrete 干底灰作为细骨料在碾压混凝土中的应用
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6112
N. Ghafoori, Y. Cai, B. Ahmadi
{"title":"Use of Dry Bottom Ash as a Fine Aggregate in Roller Compacted Concrete","authors":"N. Ghafoori, Y. Cai, B. Ahmadi","doi":"10.14359/6112","DOIUrl":"https://doi.org/10.14359/6112","url":null,"abstract":"Tests were carried out on a series of laboratory-made roller compacted concretes (RCC) containing high-calcium dry bottom ash as a fine aggregate. Concrete specimens of 6 different proportions (cement factors of 188 to 337 kg/cubic meter and coarse aggregate contents of 1042 to 1349 kg/cubic meter) were prepared at their optimum moisture content and fabricated in accordance with the requirements of ASTM C 1170, Procedure A. The RCC samples were moist-cured under different ages and tested for compression, splitting-tension, flexure, modulus of elasticity, drying shrinkage, and resistance to abrasion and rapid freezing and thawing. From the data produced in this investigation, it is concluded that good strength, stiffness, drying shrinkage, and resistance to wear and repeated freezing and thawing cycles can be obtained with compacted concretes containing bottom ash of a dry coal combustion process.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"67 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":"114808628","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: 18
"Corrosion Protection Shield of Steel Bars, Due to Steel Fibers in Concrete" 钢筋的防腐蚀屏蔽，由于混凝土中的钢纤维
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1900-01-01 DOI: 10.14359/6099
A. K. Someh, N. Saeki, T. Notoya
{"title":"\"Corrosion Protection Shield of Steel Bars, Due to Steel Fibers in Concrete\"","authors":"A. K. Someh, N. Saeki, T. Notoya","doi":"10.14359/6099","DOIUrl":"https://doi.org/10.14359/6099","url":null,"abstract":"Severe deterioration caused by corroding reinforcing steel in concrete structures is a major concern in the maintenance of safe and reliable infrastructure. The corrosion behavior of steel fibers and steel bars under two different aggressive conditions of modified ferroxyl gel reagent and wet-dry salt spray are described. In general, the results in the aggressive gel environment indicate that when steel fibers and steel bars were contacting each other, the initiation of corrosion in the steel fibers became considerable. When the steel fibers were electrically connected to the steel bars, the steel fibers tend to become the anode while the steel bars tend to become the cathode. The corrosion initiation, its propagation and the growth of the corrosion zones occurred in the steel fibers. The steel bars, set in the cathode zone, were protected by the surrounding steel fibers which formed a corrosion protective shield. This galvanic protection behavior by steel fibers was clearly observed in ferroxyl transparent gel.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","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":"126736019","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: 1
Design of High Strength High-Performance Concrete Members 高强度高性能混凝土构件的设计
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1900-01-01 DOI: 10.14359/6095
V. Rangan
{"title":"Design of High Strength High-Performance Concrete Members","authors":"V. Rangan","doi":"10.14359/6095","DOIUrl":"https://doi.org/10.14359/6095","url":null,"abstract":"High Strength High Performance Concrete (HSC/HPC) has been used in a number of projects in several countries. Research on HSC/HPC is currently in progress in a number of centers. The author and his research team at Curtin University have conducted research on the behavior and the strength of HSC/HPC structural members. The research comprised experimental and analytical studies on columns under eccentric compression, structural walls subjected to horizontal and vertical loads, bond strength and bar splice lengths, shear strength of beams, concrete filled steel tubular composite columns, and long-term deflection of flexural members. The test specimens were made using the HSC/HPC supplied by a commercial readymix plant in Perth, Western Australia. The research was funded by Australian Research Council Large Grants and by the industry. This paper presents a summary of the results obtained from the research and recommendations for design.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"69 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":"125219575","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: 1
Effect of Rice Husk Ash Blending of Portland Cement on Compressive Strength of Gap-Graded Concrete 稻壳灰掺合波特兰水泥对间隙级配混凝土抗压强度的影响
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1900-01-01 DOI: 10.14359/6102
D. Bui, P. Stroeven
{"title":"Effect of Rice Husk Ash Blending of Portland Cement on Compressive Strength of Gap-Graded Concrete","authors":"D. Bui, P. Stroeven","doi":"10.14359/6102","DOIUrl":"https://doi.org/10.14359/6102","url":null,"abstract":"Rice husk ash (RHA) is a very reactive pozzolanic material. It has been successfully used as a mineral admixture in concrete. Rice husks are readily and in large quantities available in Vietnam. Hence, it would be of economic interest to study the use of RHA for the production of high-strength and durable concretes based on indigenous raw materials. This concept should also encompass the aggregates, with coarse-grained crushed rock (granite) and very fine river sand as natural candidates. The particle size distribution of this sand violates the building code, however. Since blending with coarse (imported) sand would be too expensive, this study focused on gap-graded mixtures. The application of the RHA in conjunction with a naphthalene-based superplasticizer in the gap-graded concretes with very fine sand made it possible to produce high consistency and cohesive mixtures with a relatively low sand content. Twenty-eight days compressive strengths values of 70-90 MPa were obtained for mixtures with slumps of 140-225 mm and water to binder ratios of 0.40-0.33. For stiff mixtures, with water to binder ratios of 0.35-0.27, the 28-days compressive strength values were in the range of 60-100 MPa.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"70 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":"127265979","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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