"SP-200: Fifth CANMET/ACI Conference on Recent Advances in Concrete Technology-Proceeding, Fifth International Conference"最新文献_第3页

Effect of Sea Water on Frost Damage to Mortar and Cement Paste 海水对砂浆和水泥浆冻损的影响

"SP-200: Fifth CANMET/ACI Conference on Recent Advances in Concrete Technology-Proceeding, Fifth International Conference" Pub Date : 2001-06-01 DOI: 10.14359/10605

X. Wang, K. Ayuta

{"title":"Effect of Sea Water on Frost Damage to Mortar and Cement Paste","authors":"X. Wang, K. Ayuta","doi":"10.14359/10605","DOIUrl":"https://doi.org/10.14359/10605","url":null,"abstract":"Serious deterioration of concrete usually occurs under the influence of both sea water and frost action in cold regions. In order to clarify the connection between pore structure and frost behavior of concrete surface as affected by sea water and freezing-thawing action, three series were carried out using small mortar and cement paste specimens. The first one was to investigate the effects of sea water on pore structure by means of mercury-intrusion porosity meter; the second one was to investigate the effects of sea water on products by means of X-ray diffraction; and the last one was to investigate the effects of sea water on freezable water by means of differential scanning calorimetry. Results obtained show that specimens immersed in sea water have many pores ranging in size of several hundred nm to thousand nm, and contain much more freezable water than those immersed in fresh water. When concrete is affected by both sea water and freezing and thawing action, the number of medium-size pores (100 nm to 1000 nm) and the amount of freezable water increase. There is good correlation between the total pore volume and the amount of freezable water. Accordingly, it is considered that marine concrete in cold regions deteriorates because the pore structure near the exposure surface becomes more porous and the amount of freezable water increases.","PeriodicalId":184301,"journal":{"name":"\"SP-200: Fifth CANMET/ACI Conference on Recent Advances in Concrete Technology-Proceeding, Fifth International Conference\"","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114185383","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 Incorporating Metakaolin on Fresh and Hardened Properties of Concrete 掺加偏高岭土对混凝土新鲜性能和硬化性能的影响

"SP-200: Fifth CANMET/ACI Conference on Recent Advances in Concrete Technology-Proceeding, Fifth International Conference" Pub Date : 2001-06-01 DOI: 10.14359/10586

H. A. Razak, H. Wong

引用次数: 5

Shear Capacity of Reinforced Concrete Beams Made with Recycled-Aggregate 再生骨料钢筋混凝土梁抗剪承载力研究

"SP-200: Fifth CANMET/ACI Conference on Recent Advances in Concrete Technology-Proceeding, Fifth International Conference" Pub Date : 2001-06-01 DOI: 10.14359/10598

B. Han, H. Yun, S. Chung

引用次数: 59

Recycling of Demolished Concrete 拆卸混凝土的循环再造

"SP-200: Fifth CANMET/ACI Conference on Recent Advances in Concrete Technology-Proceeding, Fifth International Conference" Pub Date : 2001-06-01 DOI: 10.14359/10568

S. Nagataki, K. lida

引用次数: 37

Influence of Setting Accelerators on Chemical Shrinkage of Portland Cement 凝结促进剂对硅酸盐水泥化学收缩的影响

"SP-200: Fifth CANMET/ACI Conference on Recent Advances in Concrete Technology-Proceeding, Fifth International Conference" Pub Date : 2001-06-01 DOI: 10.14359/10582

F. Clemmens, P. Depuydt, H. Justnes, D. Gemert, E. J. Sellevold

引用次数: 1

Evaluation of Procedures for In Situ Tensile Bond Testing of Concrete Repairs 混凝土修补现场拉伸粘结试验方法评价

"SP-200: Fifth CANMET/ACI Conference on Recent Advances in Concrete Technology-Proceeding, Fifth International Conference" Pub Date : 2001-06-01 DOI: 10.14359/10575

J. E. McDonald, A. Vaysburd

引用次数: 0

Counteracting Retardation of Cement Setting By Other Admixtures with Calcium Nitrate 其他硝酸钙外加剂对水泥凝结缓凝的抵消作用

"SP-200: Fifth CANMET/ACI Conference on Recent Advances in Concrete Technology-Proceeding, Fifth International Conference" Pub Date : 2001-06-01 DOI: 10.14359/10570

H. Justnes, B. G. Petersen

引用次数: 3

Effects of Ground and Classified Fly Ash on Properties of High-Performance Concrete 磨粒粉煤灰和分级粉煤灰对高性能混凝土性能的影响

"SP-200: Fifth CANMET/ACI Conference on Recent Advances in Concrete Technology-Proceeding, Fifth International Conference" Pub Date : 2001-06-01 DOI: 10.14359/10583

M. K. H. Patoary, P. Nimityongskul

{"title":"Effects of Ground and Classified Fly Ash on Properties of High-Performance Concrete","authors":"M. K. H. Patoary, P. Nimityongskul","doi":"10.14359/10583","DOIUrl":"https://doi.org/10.14359/10583","url":null,"abstract":"The investigation presented in this study shows an example of the improvements of fly ash fineness achieved by a physical process, air-classification and a mechanical process, grinding. To make high-performance concrete, three different types of fly ash namely, original, air-classified, and ground fly ash, with different finenesses was used as cement replacement. The percentage replacement of cement by each type of fly ash was used as 0, 10, 15 and 20% by weight of cementing materials. Finally, the results were compared with silica fume concrete. The results showed that substitution of part of the cement with original or classified fly ash produces concrete mixtures with greater workability than the control as measured by slump and slump-flow. On the contrary, it was found that the ground fly ash, having more or less the same degree of fineness as classified fly ash resulted in a lower workability due to the loss of its spherical shape and lubricant effect. The inclusion of original fly ash reduced the early strength and this reduction was more significant with the increase of percentage replacements. Classified and ground fly ash improved the early strength. The long-term strength development of classified and ground fly ash concrete was found to be considerably higher than that of control concrete for all the percentage replacements.","PeriodicalId":184301,"journal":{"name":"\"SP-200: Fifth CANMET/ACI Conference on Recent Advances in Concrete Technology-Proceeding, Fifth International Conference\"","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115822810","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

Chloride Diffusion in Reinforced Concrete Beam Under Sustained loading 钢筋混凝土梁在持续荷载作用下的氯离子扩散

"SP-200: Fifth CANMET/ACI Conference on Recent Advances in Concrete Technology-Proceeding, Fifth International Conference" Pub Date : 2001-06-01 DOI: 10.14359/10607

A. Castel, O. Francy, R. François, G. Arliguie

{"title":"Chloride Diffusion in Reinforced Concrete Beam Under Sustained loading","authors":"A. Castel, O. Francy, R. François, G. Arliguie","doi":"10.14359/10607","DOIUrl":"https://doi.org/10.14359/10607","url":null,"abstract":"The purpose of this paper is to determine the effect of mechanical loading on the transport properties of concrete. The test specimen (B1CL) used for chloride measurement, was a three-meter long reinforced beam kept in a loading state, in a confined salt fog (35 g/l of NaCl) for fourteen years. Because of corrosion of reinforcement, the characterization of mechanical loading was made on another old beam (B1T) cast at the same time but stored in a non-aggressive environment. The measurement of tensile concrete strains using strain gauges showed two parts in the bottom of the beam: the first one is characterized by an elastic behavior and the second one by non-elastic one which is still controlled by the steel reinforcement. Total chloride profiles in relation to the depth were measured in different locations of the tensile zone of reinforced beam B1CL. Until 15 mm depth, the chloride content is constant and corresponds to the maximum chloride content available, taking into account both concrete porosity (where free chloride content corresponds to 35 g/l of NaCl) and concrete binding capacity. Beyond 15 mm depth, total chloride profiles appear to be pure diffusion profiles allowing to calculate the effective diffusion coefficient by using a saturated model of chloride motion taking into account the non-linear binding capacity of concrete. The evolution of effective diffusion coefficient in the beam field (B1CL) is strongly correlated with the field of non-elastic strains in concrete (B1T) and can increase up to 40% in the part of the beam where the non-elastic damage is the more important.","PeriodicalId":184301,"journal":{"name":"\"SP-200: Fifth CANMET/ACI Conference on Recent Advances in Concrete Technology-Proceeding, Fifth International Conference\"","volume":"171 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114648525","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: 11

Old and New Coatings Against Chloride Ingress in Concrete 防止混凝土中氯化物侵入的新旧涂料

"SP-200: Fifth CANMET/ACI Conference on Recent Advances in Concrete Technology-Proceeding, Fifth International Conference" Pub Date : 2001-06-01 DOI: 10.14359/10602

J. Beslać, K. Mavar

引用次数: 0