"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete"最新文献_第3页

Effect of Curing Methods and Conditions on the Performance of Fly Ash Concrete in De-king Salt Scaling 养护方式和养护条件对粉煤灰混凝土脱盐结垢性能的影响

"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete" Pub Date : 1998-06-01 DOI: 10.14359/5988

A. Bilodeau, Min-hong Zhang, V. Malhotra, D. Golden

{"title":"Effect of Curing Methods and Conditions on the Performance of Fly Ash Concrete in De-king Salt Scaling","authors":"A. Bilodeau, Min-hong Zhang, V. Malhotra, D. Golden","doi":"10.14359/5988","DOIUrl":"https://doi.org/10.14359/5988","url":null,"abstract":"Seven air-entrained concrete mixtures including reference concrete without fly ash, concrete incorporating 25 and 35% fly ash, and a high-volume fly ash concrete mixture with 58% fly ash were made in this study. The water-to-cementitious materials ratio of the mixtures ranged from 0.32 to 0.45, and the fly ash used was an ASTM Class F, low calcium fly ash. Concrete slabs were cast and used for the determination of the resistance of concrete to the de-icing salts scaling. Most slabs were cast in horizontal moulds and finished using a wood trowel but a number of slabs were cast in vertical moulds. The slabs were either moist cured or cured using a curing compound before being subjected to drying prior to the scaling test. Different moist-curing and air-drying periods were used. Also, the water absorption of the surface of the slabs was determined immediately before the scaling test. For the same water-to-cementitious materials ratio, the fly ash concrete showed more scaling than the reference concrete. However, concretes incorporating up to 35% fly ash by mass and having a W/(C+FA) of 0.40 or less performed well in the scaling test when tested using the standard 14-day moist-curing and 14-day air-drying periods. Extended moist-curing periods beyond 14 days do not insure increased resistance to de-icing salt scaling for concrete, and this is particularly so for fly ash concrete. The drying affects significantly the surface of the slabs and makes them more vulnerable to scaling, possibly through the development of microcracking; this effect seems to be more severe for the fly ash concrete. The performance of the slabs cast vertically was not significantly different from that of the slabs cast horizontally. The use of the curing compounds greatly improved the scaling resistance of all concretes but was more beneficial for the fly ash concretes.","PeriodicalId":425482,"journal":{"name":"\"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete\"","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117288880","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

Significance of the Type of Cement on the Reaction Mechanisms of Pozzolans 水泥类型对火山灰反应机理的影响

"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete" Pub Date : 1998-06-01 DOI: 10.14359/5975

B. Meng, U. Wiens, P. Schießl

引用次数: 1

Microstructure of Concretes Made with and without Blast Furnace Slag after 40 Years of Immersion in Saturated Gypsum Solutions at 20” C 掺和不掺高炉渣混凝土在20℃饱和石膏溶液中浸渍40年后的微观结构

"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete" Pub Date : 1998-06-01 DOI: 10.14359/6017

A. Courault, A. Crumbie, D. Sorrentino, D. Damidot

引用次数: 0

The Microstructure and Chloride Ion Diffusion Characteristics of Cements Containing Metakaolin and Fly Ash 偏高岭土-粉煤灰水泥的微观结构及氯离子扩散特性

"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete" Pub Date : 1998-06-01 DOI: 10.14359/5989

J. Cabrera, S. Nwaubani

引用次数: 18

Pozzolanic Interaction Between Portland Cement and Silica Fume in Concrete 硅酸盐水泥与混凝土中硅灰的相互作用

"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete" Pub Date : 1998-06-01 DOI: 10.14359/6001

B. Persson

引用次数: 9

De-king Salt Scaling of Concrete Incorporating Different Types and Percentages of Fly Ashes 掺入不同粉煤灰类型和掺量混凝土的脱盐结垢研究

"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete" Pub Date : 1998-06-01 DOI: 10.14359/5996

M. H. Zhang, A. Bilodeau, G. Shen, V. Malhotra

{"title":"De-king Salt Scaling of Concrete Incorporating Different Types and Percentages of Fly Ashes","authors":"M. H. Zhang, A. Bilodeau, G. Shen, V. Malhotra","doi":"10.14359/5996","DOIUrl":"https://doi.org/10.14359/5996","url":null,"abstract":"This paper reports the results of an investigation on the effect of the water-to-(cement+fly ash) ratio, fly ash content, fly ash type, and curing compounds on the de-icing salt scaling resistance of concrete, and attempts to explain why fly ash, when used in large amounts in air-entrained concrete, reduces its resistance to the de-icing salt scaling. Fourteen air-entrained concrete mixtures were made in this investigation. The water-to-cementitious materials ratio of the concrete mixtures ranged from 0.32 to 0.45. Two ASTM Class F and one Class C fly ashes were included in this investigation, and the fly ash content ranged from 25 to 58% by mass of the total cementitious materials. Two control portland cement concrete mixtures with the water-to-cement ratios of 0.40 and 0.45 were included in this study for comparison. The type and the amount of fly ash used and the water-to-cementitious materials ratio of the concrete affect considerably the de-icing salt scaling resistance of concrete. In general, the resistance to the scaling decreases with increasing amounts of fly ash and increasing water-to-cementitious materials ratio. When cured with the curing compounds, both the control concrete and the concrete incorporating fly ash showed substantially less scaling than the concretes cured in the moist room. The water absorption of the moist-cured concrete seems to be related to its resistance to the de-icing salt scaling; the scaling increased with increasing water absorption. However, the concrete cured with the curing compounds had much less scaling than the concrete cured in the moist room even though the water absorption of the former concrete was higher than the latter. The microstructure of the cement paste at the on-set of the freezing and thawing appears to affect the de-icing salt scaling of the concrete.","PeriodicalId":425482,"journal":{"name":"\"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete\"","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115778507","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: 9

Technological Complex for Utilization of High-Calcium Ash and Slag for Abakan Thermal Power Plant 阿巴坎热电厂高钙灰渣综合利用技术基地

"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete" Pub Date : 1998-06-01 DOI: 10.14359/5973

S. Pavlenko, A. Shishkanov, Y. Bazhenov

{"title":"Technological Complex for Utilization of High-Calcium Ash and Slag for Abakan Thermal Power Plant","authors":"S. Pavlenko, A. Shishkanov, Y. Bazhenov","doi":"10.14359/5973","DOIUrl":"https://doi.org/10.14359/5973","url":null,"abstract":"The Siberian State Academy for Mining and Metallurgy (SSAMM) and Uglestrinproject have developed a project for complex utilization of waste produced by burning brown coals from Kansk-Achinsk Power Complex at the Abakan thermal power plant. The project provides for total utilization of ashes and slags from the thermal power plant for producing finished 'cementless' binder and aggregate, finished 'cementless' fine ash/slag concrete and mortar, precast reinforced concrete structures and small products (silicate brick). Previous investigation of ash and slag from the thermal power plant and concretes on their base was completed in 1995. After grinding and introducing silica fume, ash and slag to meet the requirements of State Standard 25818-91, concrete is in accordance with State Standard 26633-91. The technological complex providing 100% utilization of waste products from the TPP includes departments for grinding ash with a storage, for producing sand from slag with a storage, molding with concrete mixers and premises for admixtures. The project has been approved by a nature committee of the Khakass Republic and is in accordance with the ecological standards. The construction of the complex is currently under way.","PeriodicalId":425482,"journal":{"name":"\"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete\"","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126203713","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

A Novel Clinkerization Process for Fly-Ash Utilization 粉煤灰利用的新型熟化工艺

"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete" Pub Date : 1998-06-01 DOI: 10.14359/5981

S. Khadilkar, M. Karandikar, D.Ghosh, A. Chatterjee

引用次数: 1

Silica Fume Distribution and Reactivity in Reactive Powder Concretes 活性粉末混凝土中的硅灰分布和反应性

"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete" Pub Date : 1998-06-01 DOI: 10.14359/6016

L. Gatty, S. Bonnamy, A. Feylessoufi, H. Damme, P. Richard

引用次数: 5

Fly Ash Customization for Defined Performance Concretes 定义性能混凝土的粉煤灰定制

"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete" Pub Date : 1998-06-01 DOI: 10.14359/5982

H. Cornelissen, J. V. D. Berg

{"title":"Fly Ash Customization for Defined Performance Concretes","authors":"H. Cornelissen, J. V. D. Berg","doi":"10.14359/5982","DOIUrl":"https://doi.org/10.14359/5982","url":null,"abstract":"This paper describes the approach for customization of fly ash, focused on the proportioning of concrete mixtures for applications where specific performance is needed such as strength, durability and workability. In order to tailor these specific concrete mixtures, bulk fly ashes can be selected and upgraded to fulfil the requirements with respect to for instance, grain size distribution and carbon content (LOI). By customization of fly ash its value will increase, which is beneficial in spite of the cost for upgrading. For customization, basic knowledge and relationships are needed about the decisive influential factors of the total system of concrete components and design. To this end, descriptive models have been evaluated and applied with the emphasis on models for fly ash fineness and packing. These models have been used as a background for classification and micronization of fly ash. In experimental work, a relation was found between the dry packing of the solid constituents of mortar and the workability after the addition of water. Then fine and ultra-fine fly ashes were processed through air-classification and grinding (micronization). These processed fly ashes were added to concrete and the strength development was compared to concrete with silica fume and with reference concrete. In full scale tests the suitability of micronized fly ash for the production of very workable concrete was confirmed.","PeriodicalId":425482,"journal":{"name":"\"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete\"","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133179763","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

"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag &amp; Natural Pozzolans in Concrete"最新文献

"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete"最新文献