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

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Fiber Matrix Compatibility Consideration in Fiber Reinforced Cements and Concretes 纤维增强水泥和混凝土中纤维基质相容性的考虑
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6100
Collin D.Johnston
{"title":"Fiber Matrix Compatibility Consideration in Fiber Reinforced Cements and Concretes","authors":"Collin D.Johnston","doi":"10.14359/6100","DOIUrl":"https://doi.org/10.14359/6100","url":null,"abstract":"General concepts governing the interaction of fibers with paste, mortar and concrete matrices are presented for the freshly mixed and hardened states in the context of the need to reconcile these often conflicting interactions to produce useful composites. Problems and limitations arising from the addition of fibers are discussed in terms of fiber amount, material type, form (monofilament, multifilament, bundled, etc.), geometry and compatibility with the manufacturing process from mixing to final consolidation in the freshly mixed state. Fiber-matrix compatibility considerations are also identified for the hardened state with respect to their importance for short-term and particularly sustained long-term property enhancement. Long-term performance is highlighted for circumstances where chemical incompatibility of fibers and matrix may lead to gradual deterioration in initially very satisfactory early-age properties.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"54 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":"121025400","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
Water Sorptivity of Heat-Cured Concrete for Bridge Structures 桥梁结构用热固化混凝土的吸水性能
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6092
D. Ho, G. Chirgwin, S. Mak
{"title":"Water Sorptivity of Heat-Cured Concrete for Bridge Structures","authors":"D. Ho, G. Chirgwin, S. Mak","doi":"10.14359/6092","DOIUrl":"https://doi.org/10.14359/6092","url":null,"abstract":"Performance-based specifications are increasingly used to complement traditional prescriptive specifications in an effort to improve service life performance of major infrastructure assets such as bridges. The water sorptivity of concrete, which relates to the moisture transport properties of near-surface concrete, has recently been adopted for trial application as a performance specification of concrete for bridge construction. While data on water sorptivity of concretes cured under normal conditions are available, those of concrete subjected to heat curing are not yet widely available. This is particularly pertinent given that heat-cured precast structural elements are frequently used in bridge construction. This paper discusses the water sorptivity concept, its adoption in bridge specifications in New South Wales, and the performance of heat-cured concretes that could potentially be used in bridge construction.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"303 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":"116118030","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: 10
Construction of Joints in Roller Compacted Dam Concrete 碾压坝混凝土缝施工
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6110
T. Iisaka
{"title":"Construction of Joints in Roller Compacted Dam Concrete","authors":"T. Iisaka","doi":"10.14359/6110","DOIUrl":"https://doi.org/10.14359/6110","url":null,"abstract":"Construction of transverse joints with lateral molds in RCD (Roller Compacted Dam) method has been omitted because concrete layers are casted continuously. However, transverse joints in dam concrete should be required to prevent the occurrence of cracking. In this study, the development of a vibrating machine which can make the joints was done so that the transverse joints could be constructed in the RCD concrete. Many kinds of experiments were conducted using this machine with respect to period and direction of joint, pattern of joint material and its injection, in order to make clear the method for construction of joints. The proposed method is applicable in the actual construction of RCD concrete, and preferable results are obtained.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"90 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":"122727671","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
Sulfates in Cement Clinker and Their Effect on Concrete Durability 水泥熟料中硫酸盐及其对混凝土耐久性的影响
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6119
J. Skalny, Johansen, F. Miller
{"title":"Sulfates in Cement Clinker and Their Effect on Concrete Durability","authors":"J. Skalny, Johansen, F. Miller","doi":"10.14359/6119","DOIUrl":"https://doi.org/10.14359/6119","url":null,"abstract":"It has been reported that the chemical/mineralogical composition of modern portland-cement clinkers has changed in recent years to such a degree that cements made from them may lead to concrete durability problems even if such cement passed the applicable specifications. The effect of sulfur compounds in clinker on concrete deterioration due to delayed attringite formation is cited as an example. In this paper, the relevant issues are briefly evaluated in light of available laboratory data and field experience.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"46 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":"114759072","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
The Effect of Electrochemical Chloride Extraction Treatment on the Microstructure and Mechanical Properties of Cementitiuos Materials 电化学氯离子萃取处理对渗碳材料微观结构和力学性能的影响
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6113
T. Marcotte, N. M. Ihekwaba, C. Hansson, B. Hope
{"title":"The Effect of Electrochemical Chloride Extraction Treatment on the Microstructure and Mechanical Properties of Cementitiuos Materials","authors":"T. Marcotte, N. M. Ihekwaba, C. Hansson, B. Hope","doi":"10.14359/6113","DOIUrl":"https://doi.org/10.14359/6113","url":null,"abstract":"Electrochemical chloride extraction is a rehabilitation process aimed at reducing the chloride levels of contaminated reinforced concrete structures to below the critical values for corrosion of the reinforcing steel (rebar). This research attempts to characterize the changes in concrete and mortar, particularly at their interface with the rebar, due to an extraction treatment. To this end, concrete specimens with 3.0 percent Cl- by mass of cement, and mortar specimens with 2.0 percent Cl- by mass of the cement were cast, cured and, after various exposures, subjected to electrochemical chloride extraction treatments typical of those applied commercially. It is clear from this study that the structure and mechanical properties of the concrete immediately adjacent to the reinforcing steel are severely degraded by the electrochemical extraction treatment.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"20 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":"127073517","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
"Evaluation of Polymer-Modified, Cement-Based Mortars for Replacing Concrete Structures in Cold Climates" 聚合物改性水泥基砂浆在寒冷气候条件下替代混凝土结构的评价
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6106
J. Mirza, R. Lapointe, M. Mirza
{"title":"\"Evaluation of Polymer-Modified, Cement-Based Mortars for Replacing Concrete Structures in Cold Climates\"","authors":"J. Mirza, R. Lapointe, M. Mirza","doi":"10.14359/6106","DOIUrl":"https://doi.org/10.14359/6106","url":null,"abstract":"This paper describes the results of an ongoing test program to evaluate the performance of polymer-modified cement-based mortars for repairing surfaces up to a depth of 75 mm (3 inches) of concrete structures damaged due to exposure to cold climates. Twenty-five selected commercially available polymer-modified products, seven containing styrene butadiene rubber (SBR) and 18 containing acrylics were evaluated. They were compared with a pure cement-based mortar containing 8 percent silica fume with a water/(cement + silica fume) (W/C) ratio of 0.31. All mortars were subjected to physical and mechanical tests. This paper also presents the performance of the three best polymer-modified cement-based mortars (included in the 25 mortars), installed in 1992 on two spillways of a dam in a very severe environment. The six inspections so far have found that these three products are still performing well after an exposure to very low temperatures for a period of four years.","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":"1997-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132833405","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
Assessing the Tightness of the Surface Layer of Concrete 混凝土面层密封性评定
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6117
M. Shoya, Y. Tsukinaga, S. Sugita
{"title":"Assessing the Tightness of the Surface Layer of Concrete","authors":"M. Shoya, Y. Tsukinaga, S. Sugita","doi":"10.14359/6117","DOIUrl":"https://doi.org/10.14359/6117","url":null,"abstract":"Three specific in-situ tests to assess the air tightness and water tightness of the surface layer of concrete were examined. Test methods for the tightness are the rapid air permeability, the water absorption applying Figg's method and the rapid water permeability by author's method. In the experiments, specific parameters obtained in three different in-situ tests corresponded well to air permeability coefficient and coefficient of water diffusion in the firms indoor tests, and those parameters satisfactorily reflect the change in the tightness of the surface layer caused by the water to cement ratio, age of test and cement type. Those parameters changed when measured at a relatively high temperature. In conclusion, three test methods are promising for providing air tightness or water tightness of the surface layer of concrete from the viewpoints of using simple testing devices and convenient procedures.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"76 22 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":"127392712","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
Design for Durability and Strength Through the Use of Fly Ash and Slag in Concrete 粉煤灰和矿渣在混凝土中的应用对混凝土耐久性和强度的影响
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6090
R. N. Swamy
{"title":"Design for Durability and Strength Through the Use of Fly Ash and Slag in Concrete","authors":"R. N. Swamy","doi":"10.14359/6090","DOIUrl":"https://doi.org/10.14359/6090","url":null,"abstract":"This paper presents a critical evaluation of the use of fly ash and ground granulated blast-furnace slag in concrete. In order to develop a rational concrete mixture incorporating these siliceous materials, their inherent characteristics are assessed, including their limitations and weaknesses. Based on the mixture proportioning methodology advocated, it is shown that fly ash and slag concretes, having the same three-day cube strength as concrete without them, can be produced. Engineering implications of using these materials such as increased bleeding and times of setting, reduced heat of hydration, low-early strength, and slow rate of gain of strength are addressed, and the need and role of a minimum period of moist curing to mobilize the chemically-bound qualities of these materials are emphasized. It is shown that a slag fineness of about 1200 square meters/kg can produce concretes of high strength and exceptional durability.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"85 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":"131466968","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: 67
Setting Shrinkage and Setting Stress of Polymer Mortar 聚合物砂浆的凝结收缩与凝结应力
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6118
F. Omata, M. Kawakami, H. Tokushige, A. Moriyoshi
{"title":"Setting Shrinkage and Setting Stress of Polymer Mortar","authors":"F. Omata, M. Kawakami, H. Tokushige, A. Moriyoshi","doi":"10.14359/6118","DOIUrl":"https://doi.org/10.14359/6118","url":null,"abstract":"This paper describes changes of stress and strain during the setting of prismatic specimens incorporating polymer mortar. A new apparatus measures setting shrinkage stress and strains developed at both ends of polymer mortar specimens while at constant temperature. This apparatus is simple in structure, consisting of a noncontact type displacement device and a load measuring device. The relationships of setting shrinkage stresses and strains, and elastic modulus of three kinds of polymer mortar are reported. Furthermore, the mechanical properties of three kinds of polymer mortar were investigated. Finally, the deflection and strain that occur when polymer mortar is overlaid on ALC (Autoclaved light weight concrete) beams includes both analysis and experimental data on the two layered structure.","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":"134507333","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
Multivariate Statistical Methods in Evaluation of Concrete and Aggregate Properties 混凝土和骨料性能评价中的多元统计方法
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology Pub Date : 1997-08-01 DOI: 10.14359/6114
P. Hudec
{"title":"Multivariate Statistical Methods in Evaluation of Concrete and Aggregate Properties","authors":"P. Hudec","doi":"10.14359/6114","DOIUrl":"https://doi.org/10.14359/6114","url":null,"abstract":"Simple univariate statistical analyses such as mean, standard deviation, and bivariate regression, and correlation etc. are in widespread use in concrete technology. However, they only give results concerning at most two variables at a time. In the real world, the properties such as strength, frost resistance, alkali reactivity, etc. depend on several mutually dependent variables. For instance, multivariate statistical techniques such as cluster analysis can group all aggregates with similar properties; factor analysis can discern what combination of tests best describe a desired property of concrete, and stepwise regression analysis can be used to predict serviceability (project life) of concrete or aggregate based on several standard tests. Examples of the above statistical techniques are presented in a non-technical format, based on research into concrete aggregate properties as related to their service record.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"64 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":"124684961","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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