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"SP-102: Corrosion, Concrete, & Chlorides"最新文献

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"Calcium Nitrate-Based, Non-Corrosive, Non-Chloride Accelerator" 硝酸钙基，无腐蚀性，无氯化物促进剂
"SP-102: Corrosion, Concrete, & Chlorides" Pub Date : 1987-09-01 DOI: 10.14359/1619
D. Chin
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引用次数: 1
Strength-Increasing Effects of a Chloride-Free Accelerator 无氯化物促进剂的增强作用
"SP-102: Corrosion, Concrete, & Chlorides" Pub Date : 1987-09-01 DOI: 10.14359/1620
S. Popovics
{"title":"Strength-Increasing Effects of a Chloride-Free Accelerator","authors":"S. Popovics","doi":"10.14359/1620","DOIUrl":"https://doi.org/10.14359/1620","url":null,"abstract":"Strength-increasing effects of a chloride-free accelerating admixture are investigated on various portland cement pastes, mortars and concretes with or without other admixtures. Although the test results are preliminary in nature, the available experimental evidence shows that this chloride-free accelerator increases significantly the strengths of a wide variety of cementitious compositions including portland cement, epoxy, pozzolans and combinations of these. (Author/TRRL)","PeriodicalId":432826,"journal":{"name":"\"SP-102: Corrosion, Concrete, & Chlorides\"","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126995894","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
Some Chemical and Physical Aspects of Phenomena Associated with Chloride-Induced Corrosion 与氯化物腐蚀有关的一些化学和物理现象
"SP-102: Corrosion, Concrete, & Chlorides" Pub Date : 1987-09-01 DOI: 10.14359/1631
W. Hime, B. Erlin
{"title":"Some Chemical and Physical Aspects of Phenomena Associated with Chloride-Induced Corrosion","authors":"W. Hime, B. Erlin","doi":"10.14359/1631","DOIUrl":"https://doi.org/10.14359/1631","url":null,"abstract":"The wide variety of disciplines involved with the corrosion of steel in concrete has caused difficulties in communication. Each discipline has its own terminology; at times two disciplines use conflicting terms or explanations for the same phenomenon. This paper addresses some areas of such confusion, and presents chemical mechanisms to explain half-cell potentials and causes for chloride-induced corrosion. Examples of such corrosion are presented. (Author/TRRL)","PeriodicalId":432826,"journal":{"name":"\"SP-102: Corrosion, Concrete, & Chlorides\"","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128728598","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: 26
Review of Electrochemical Principles as Applied to Corrosion of Steel in a Concrete or Grout Environment 电化学原理在混凝土或灌浆环境中对钢的腐蚀研究进展
"SP-102: Corrosion, Concrete, & Chlorides" Pub Date : 1987-09-01 DOI: 10.14359/1633
J. Fraczek
{"title":"Review of Electrochemical Principles as Applied to Corrosion of Steel in a Concrete or Grout Environment","authors":"J. Fraczek","doi":"10.14359/1633","DOIUrl":"https://doi.org/10.14359/1633","url":null,"abstract":"Corrosion of steel in concrete proceeds at a far greater rate in the presence of chloride ions. Most researchers agree that chloride ions act as an essential part of the corrosion cell by (1) lowering the ph of the concrete pore water in contact with the steel, thereby dissolving the passive oxide film on the steel surface, or (2) penetrating the film to react with and transport the metallic iron into the electrolyte. In the latter process, the resulting iron chloride complex ion combines with hydroxyl ions to form ferrous hydroxide in solution and lower the ph. This, in turn, thins out the oxide film and speeds penetration of chloride ions. Eventually the continuing corrosive action results in a pit. To initiate corrosion, a threshold concentration of chloride is needed in excess of the amount immobilized by reaction with tricalcium aluminate in the cement. Investigation of the chloride ion content in concrete adjacent to corroding reinforcing steel shows the concentration to be 1.0 to 1.4 lb of chloride ion per cubic yard of concrete (0.59-0.83 kg/cubic metre). (Author/TRRL)","PeriodicalId":432826,"journal":{"name":"\"SP-102: Corrosion, Concrete, & Chlorides\"","volume":"200 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121535825","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: 20
Influence of Chlorides in Reinforced Concrete 氯化物对钢筋混凝土的影响
"SP-102: Corrosion, Concrete, & Chlorides" Pub Date : 1987-09-01 DOI: 10.14359/1639
T. Webster, B. Erlin, R. Gaynor
{"title":"Influence of Chlorides in Reinforced Concrete","authors":"T. Webster, B. Erlin, R. Gaynor","doi":"10.14359/1639","DOIUrl":"https://doi.org/10.14359/1639","url":null,"abstract":"","PeriodicalId":432826,"journal":{"name":"\"SP-102: Corrosion, Concrete, & Chlorides\"","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134493629","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
Effects of Two Non-Chloride Accelerating Agents on Setting Characteristics of Portland Cement Mortars 两种非氯化物速凝剂对硅酸盐水泥砂浆凝结特性的影响
"SP-102: Corrosion, Concrete, & Chlorides" Pub Date : 1987-09-01 DOI: 10.14359/1635
P. Smith
{"title":"Effects of Two Non-Chloride Accelerating Agents on Setting Characteristics of Portland Cement Mortars","authors":"P. Smith","doi":"10.14359/1635","DOIUrl":"https://doi.org/10.14359/1635","url":null,"abstract":"Effects of two non-chloride accelerating agents --sodium thiocyanate and calcium nitrate --on time to achieve initial set of two brands of type i cement were determined at 70 f (21 c) and 40 f (4 c). Results with these two non-chloride accelerators were compared with results with calcium chloride, the conventional accelerator. Tests show: -low or moderate dosages of the two non-chloride accelerators can reduce time to achieve initial set by 1-2 hr. -any one of the three accelerators may be more effective with one cement than with another cement having similar setting characteristics without accelerators. -in general, all three of the accelerators are more effective at 40 f than at 70 f. (Author/TRRL)","PeriodicalId":432826,"journal":{"name":"\"SP-102: Corrosion, Concrete, & Chlorides\"","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128987383","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
Understanding Chloride Percentages 了解氯化物的百分比
"SP-102: Corrosion, Concrete, & Chlorides" Pub Date : 1987-09-01 DOI: 10.14359/1608
Richard D. GaynorI
{"title":"Understanding Chloride Percentages","authors":"Richard D. GaynorI","doi":"10.14359/1608","DOIUrl":"https://doi.org/10.14359/1608","url":null,"abstract":"","PeriodicalId":432826,"journal":{"name":"\"SP-102: Corrosion, Concrete, & Chlorides\"","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130532842","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
Comparison of the Corrosion Potential of Calcium Chloride and a Calcium Nitrate Based on Non-Chloride Accelerator 基于非氯离子促进剂的氯化钙和硝酸钙腐蚀电位的比较
"SP-102: Corrosion, Concrete, & Chlorides" Pub Date : 1987-09-01 DOI: 10.14359/1637
J. Holm
{"title":"Comparison of the Corrosion Potential of Calcium Chloride and a Calcium Nitrate Based on Non-Chloride Accelerator","authors":"J. Holm","doi":"10.14359/1637","DOIUrl":"https://doi.org/10.14359/1637","url":null,"abstract":"","PeriodicalId":432826,"journal":{"name":"\"SP-102: Corrosion, Concrete, & Chlorides\"","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128413396","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
Cathodic Protection (corrosion control) of Reinforced Concrete Structures Using Conductive Coatings 导电涂料对钢筋混凝土结构的阴极保护(腐蚀控制)
"SP-102: Corrosion, Concrete, & Chlorides" Pub Date : 1987-09-01 DOI: 10.14359/1638
J. Lehmann
{"title":"Cathodic Protection (corrosion control) of Reinforced Concrete Structures Using Conductive Coatings","authors":"J. Lehmann","doi":"10.14359/1638","DOIUrl":"https://doi.org/10.14359/1638","url":null,"abstract":"Usually concrete is an ideal environment for steel. Reinforcing steel in most concrete structures is not subject to corrosion. However, when salts (chlorides or sulfates) penetrate concrete and reach steel rebars, corrosion becomes active. Rust takes up a larger volume than the iron from which it is formed, developing pressures as great as 5000 psi within the concrete. This pressure causes cracking and spalling. Ultimately, failure occurs and major repair or replacement is needed. Once salts (from deicing, bleaching, marine environment, foreign aggregate, etc) contaminate concrete, corrosion progresses rapidly. Penetrants, sealants, surface coatings, and membrane barriers are useless in combatting the effects of salts already in concrete. The use of cathodic protection to control corrosion on reinforcing steel in concrete is relatively new. Although cathodic protection has been employed on pipelines, offshore platforms, ship hulls, buried tanks, etc for more than 40 years, its use on concrete bridge decks was initiated only in the early 70's. Since the development of conductive coatings (1980-82) the effectiveness of cathodic protection has been enhanced. It has become easier to install and is now applicable to many different types of concrete structures (i.e., docks; harbor facilities; marine terminals; bridge substructures such as piers, pier caps, and beams; bulkheads; parking garages; industrial water and waste treatment plants; tunnels; coastal buildings; etc). As the acceptance of \"conductive-coating cathodic protection\" continues to grow, new applications develop. This new form of an established technique holds extraordinary promise for large-scale preservation of concrete structures. (Author/TRRL)","PeriodicalId":432826,"journal":{"name":"\"SP-102: Corrosion, Concrete, & Chlorides\"","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114187903","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 Cementitious Blast-Furnace Slag on Chloride Permeability of Concrete 矿渣胶凝剂对混凝土氯离子渗透性的影响
"SP-102: Corrosion, Concrete, & Chlorides" Pub Date : 1987-09-01 DOI: 10.14359/1621
J. H. Rose
{"title":"Effect of Cementitious Blast-Furnace Slag on Chloride Permeability of Concrete","authors":"J. H. Rose","doi":"10.14359/1621","DOIUrl":"https://doi.org/10.14359/1621","url":null,"abstract":"The availability of separately ground granulated iron blast-furnace (ggbf) slag, as a separate cementitious material or supplement, has prompted new research on its effects on concrete properties. One area in which ggbf slag has particular promise in concrete is its ability to alter the permeability characteristics of concrete to the extent that its resistance to chloride intrusion is significantly improved. This paper discusses the ability of ggbf slag-cement mixtures to reduce the potential detrimental effects of chloride intrusion into concrete. Three test methods for chloride penetration were used and the results of each are discussed. The following conclusions were developed. (1) significant reductions in permeability are achieved as the replacement level of the slag increases from 40 to 65% of total cementitious material by mass. (2) the permeability of concrete containing ggbf slag is less affected by increases in water-cement ratio than concrete containing regular portland cement alone. (3) the detrimental effects of accelerated curing on the permeability of concrete are virtually eliminated with cement blends containing ggbf slag greater than 50%. (4) concrete containing ggbf slag may require less depth of cover to protect the reinforcing steel than those concretes using portland cement alone. (Author/TRRL)","PeriodicalId":432826,"journal":{"name":"\"SP-102: Corrosion, Concrete, & Chlorides\"","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123421824","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: 8
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