"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete"最新文献_第4页

Studies on the Properties of Super Workable Concrete Using Ground Granulated Blast-Furnace Slag 高炉磨粒矿渣超适用混凝土性能研究

"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete" Pub Date : 1998-06-01 DOI: 10.14359/6011

Y. Maeda, T. Chikada, Y. Nagao, Y. Dan, H. Matsushita

{"title":"Studies on the Properties of Super Workable Concrete Using Ground Granulated Blast-Furnace Slag","authors":"Y. Maeda, T. Chikada, Y. Nagao, Y. Dan, H. Matsushita","doi":"10.14359/6011","DOIUrl":"https://doi.org/10.14359/6011","url":null,"abstract":"This report presents the properties of hardened super workable concrete in which ground granulated blast furnace slag was used, and compares these properties with the corresponding properties of ordinary concrete. Two ground granulated blast furnace slags of fineness 4500 cm squared/g and 6150 cm squared/g were used for this research. The replacement ratio of cement by blast furnace slag were controlled to 0%, 30%, 50%, and 70%. The concrete specimens were cured by four different methods; in air continuously, in water for 3 days and then in air, in water for 7 days and then in air and in water continuously. The super workable concretes, which were cured in water sufficiently at early ages, exhibited higher performance in compressive strength, water permeability, resistance to freezing and thawing and carbonation in comparison with ordinary concrete. As for the porosity as well, the total pore volume of these concretes were lower than that of ordinary concrete. This excellent performance was more remarkable in the super workable concrete with blast furnace slag of fineness of 6000 cm squared/g. But, these properties of super workable concrete with blast furnace slag were more sensitive to initial water curing period than the concrete without blast furnace slag.","PeriodicalId":425482,"journal":{"name":"\"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete\"","volume":"13 7 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":"115843568","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

Engineering Properties of Concretes with Combinations of Cementitious Materials 混凝土与胶凝材料组合的工程特性

"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete" Pub Date : 1998-06-01 DOI: 10.14359/6002

R. N. Swamy, A. Darwish

{"title":"Engineering Properties of Concretes with Combinations of Cementitious Materials","authors":"R. N. Swamy, A. Darwish","doi":"10.14359/6002","DOIUrl":"https://doi.org/10.14359/6002","url":null,"abstract":"The overall objective of this paper is to establish the engineering properties of concrete containing combinations of fly ash/silica fume and slag/silica fume. Six concrete mixtures were tested, with total cementitious materials content of 350 kg/m cubed and 450 kg/m cubed, and a constant water/cementitious materials ratio of 0.45. The effect of three curing conditions was investigated, and the tests were performed up to about 260 days. The results reflect conclusively that cement replacement materials reduce sightly the engineering properties of portland cement concrete, and that the exposure conditions have a strong influence on flexural strength, dynamic modulus, and ultrasonic pulse velocity. Slag was generally found to be slightly superior to fly ash in the development of these engineering properties. The key to developing fly ash/silica fume and slag/silica fume concretes without suffering a reduction of strength gain when exposed to drying environmental conditions is to incorporate within the mixtures adequate amounts of portland cement and water to ensure the continuation of pozzolanic reactivity and hydration.","PeriodicalId":425482,"journal":{"name":"\"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete\"","volume":"18 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":"122932171","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: 5

High Calcium Fly Ash-to Silica Fume-to Slag Sand Ratio Versus Compressive Strength and Density of Cementless Concrete 高钙粉煤灰-硅灰-渣砂比对无水泥混凝土抗压强度和密度的影响

"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete" Pub Date : 1998-06-01 DOI: 10.14359/6026

S. Pavlenko, L. Myshlyaev, V. F. Evtushenko, A. Soin, Y. Bazhenov

{"title":"High Calcium Fly Ash-to Silica Fume-to Slag Sand Ratio Versus Compressive Strength and Density of Cementless Concrete","authors":"S. Pavlenko, L. Myshlyaev, V. F. Evtushenko, A. Soin, Y. Bazhenov","doi":"10.14359/6026","DOIUrl":"https://doi.org/10.14359/6026","url":null,"abstract":"The Siberian State Academy for Mining and Metallurgy (SSAMM) has developed a cementless fine-grained ash-slag concrete consisting of high calcium fly ash and slag sand from thermal power plants and containing silica fume. The composition and technology of the concrete has been patented. The compressive strength of the concrete is 5 to 20 MPa. It does not contain any natural or artificial aggregates (gravel, sand, clay, polystyrene). High-calcium fly ash combined with silica fume is used as a binder. The influence of the ratio of the above mentioned three components on the compressive strength and density of the concrete developed was studied using a computer technique. As a result, a three-dimensional integral scheme was designed for proportioning the concrete of a required strength (5 to 20 MPa) and density (2000 to 2500 kg/m cubed). The optimal mixture proportions for concrete of 20 MPa strength were as follows: Fly Ash, 30-40%; Slag Sand, 30-40%; Silica Fume, 3-4%; Water (60-80 degrees C), the rest. Concrete with optimum mixture proportions was used to investigate optimization of schedules of concrete heat treatment carried out in an automatic steam-curing chamber. Here, the three-dimensional system was involved as well: previous curing before heat treatment of 3, 6 and 12 hours; three schedules of a heat treatment i.e., 3(6)3, 3(9)3 and 3(12)3 hours cycles where (6), (9) and (12) hours are holding periods; three isothermal temperatures of 60, 80 and 100 degrees C. A computerized analysis of the investigation showed that heating of concrete during 9 to 10 hours at 80 to 100 degrees C with 6 to 7 hours of curing provided the best strength characteristics of the concrete.","PeriodicalId":425482,"journal":{"name":"\"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete\"","volume":"8 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":"124627424","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

Chloride Penetration into Concretes Incorporating Mineral Admixtures in Marine Environment 海洋环境中含矿物外加剂混凝土的氯离子渗透

"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete" Pub Date : 1998-06-01 DOI: 10.14359/6004

K. Torii, T. Sasatani, M. Kawamura

{"title":"Chloride Penetration into Concretes Incorporating Mineral Admixtures in Marine Environment","authors":"K. Torii, T. Sasatani, M. Kawamura","doi":"10.14359/6004","DOIUrl":"https://doi.org/10.14359/6004","url":null,"abstract":"This paper describes the results on the chloride penetration into concretes incorporating mineral admixtures such as fly ash, blast-furnace slag and silica fume in a marine environment. Ordinary Portland cement (OPC) concretes, fly ash (FA) 30% concretes, blast-furnace slag (BFS) 50% concretes and silica fume (SF) 10% concretes were prepared. After 7 years of the exposure time in a marine environment, concrete cores of 50 mm or 100 mm in diameter were drilled from the cubes. Concrete cores were sliced into discs of 10 mm in thickness, and then analyzed. Using chloride distribution profiles of concretes with and without mineral admixtures from the exposed surface to the interior, diffusion coefficients for chloride ions were calculated. The chloride permeability of concretes with and without mineral admixtures was also determined by the rapid chloride permeability test (RCPT). The relationship between the diffusion coefficient for chloride ions in exposure test on seashore and the charge passed in RCPT in concretes with and without mineral admixtures was discussed. From experimental results, it was found that concretes incorporating mineral admixtures were much less permeable to chloride ions than the corresponding OPC concretes, and that the chloride penetration into concretes incorporating mineral admixtures was effectively reduced, which was limited to a surface layer only 40 mm after 7 years of the exposure time. The results also showed that the diffusion coefficient for chloride ions correlated well with the charge passed in the RCPT test for all concretes.","PeriodicalId":425482,"journal":{"name":"\"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete\"","volume":"53 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":"126749616","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

Engineering Properties of High Volume Fly Ash Concrete 大体积粉煤灰混凝土的工程性能

"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete" Pub Date : 1998-06-01 DOI: 10.14359/5987

R. N. Swamy, H. Hung

{"title":"Engineering Properties of High Volume Fly Ash Concrete","authors":"R. N. Swamy, H. Hung","doi":"10.14359/5987","DOIUrl":"https://doi.org/10.14359/5987","url":null,"abstract":"The development of a high performance, high volume fly ash (HVFA) concrete incorporating a small amount of silica fume, and part replacement of both cement and sand with fly ash (FA) is reported. This paper presents the results on the engineering properties such as strength, dynamic modulus and swelling/shrinkage of such high volume fly ash concrete. The mixtures were proportioned to give 30 to 40 MPa cube strength at 28 days. Two basic mixtures with total binder contents of 350 kg/m3 and 450 kg/m3, and, with a minimum portland cement content of 150 and 200 kg/m3 respectively, were investigated. In each mixture, about 60% of the cement was replaced by fly ash. In addition, in some mixtures, a nominal amoung of silica fume was incorporated, and in some others, additional FA was incorporated as replacement for sand. The results show that the total binder content had little effect on strength, swelling strain and drying shrinkage, but had a significant effect on the dynamic modulus of elasticity implying a clear densification of the microstructure by fly ash and silica fume. On the whole, HVFA concrete with a nominal amount of silica fume and FA as part replacement of both cement and sand showed better overall performance. The engineering properties of the HVFA concretes investigated show good potential for use in structural and mass concrete applications.","PeriodicalId":425482,"journal":{"name":"\"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete\"","volume":"35 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":"132323039","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: 14

A Comparison of Mechanical Properties of Hong Kong Medium and High-Strength NPC and Fly Ash Concretes 香港中高强NPC与粉煤灰混凝土力学性能比较

"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete" Pub Date : 1998-06-01 DOI: 10.14359/5976

I. Macgregor

引用次数: 0

Selective Use of Fly Ash Concrete 粉煤灰混凝土的选择性使用

"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete" Pub Date : 1998-06-01 DOI: 10.14359/5971

V. Sirivivatnanon, R. Khatri

{"title":"Selective Use of Fly Ash Concrete","authors":"V. Sirivivatnanon, R. Khatri","doi":"10.14359/5971","DOIUrl":"https://doi.org/10.14359/5971","url":null,"abstract":"Structural grade fly ash (FA) concrete and concrete with high volume of fly ash (HVFA) are well accepted and utilized in the Australian construction industry. These are concretes with fly ash (ASTM C 618 type F) making up between 10 and 50% by weight of the total cementitious material. This paper is intended to demonstrate the importance of the selection of the appropriate amount of FA content for a range of applications. The durability performance of the FA concretes was compared with portland cement concretes of equivalent 28-day compressive strength, in terms of the resistance to carbonation, chloride penetration and sulfate attack. Some mixture design data for both FA and HVFA concretes and their mechanical properties are given. The likely optimum fly ash percentages for a range of applications are highlighted with respect to their properties and construction demands. It was found that a lower fly ash dosage would be more suitable for above ground structures where a carbonation-related deterioration mechanism applied. However, for structures in aggressive sulfate ground condition or in marine environments, HVFA concrete was found to be much more suitable. Available field performance data have confirmed laboratory evaluated performance.","PeriodicalId":425482,"journal":{"name":"\"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete\"","volume":"30 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":"124692148","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

Optimized Solidification of Mixtures of MSWI Fly Ash and Blast Furnace Slag: Use of the Statistical Design of Experiments MSWI粉煤灰与高炉炉渣混合料的优化凝固:实验统计设计的应用

"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete" Pub Date : 1998-06-01 DOI: 10.14359/5985

S. Morel, P. Clastres, D. Mathieu, A. Pellequer

{"title":"Optimized Solidification of Mixtures of MSWI Fly Ash and Blast Furnace Slag: Use of the Statistical Design of Experiments","authors":"S. Morel, P. Clastres, D. Mathieu, A. Pellequer","doi":"10.14359/5985","DOIUrl":"https://doi.org/10.14359/5985","url":null,"abstract":"This study proposes a new method for a process development based on specific planning and use of experiments. It is the 'Statistical Design of Experiments' method, comprising the selection of experiments in a manner where the results derived from these experiments can be used for the calculation of values to be analysed. Ash produced from the Incineration of Municipal Solid Wastes is required to be solidified and stabilised prior to landfilling. MSWI fly ash is a powdery material. It is comprised of hydraulic and toxic elements. Ground granulated blast furnace slag is a suitable hydraulic binder to stabilise this ash and MSWI ash can activate the slag hydraulicity. A preliminary study was undertaken on artificial MSWI ash to analyse the influence of the variation of the content of (Ca(OH)2, CaClOH, CaS04) ash components, while taking into account their interactions effects. It was demonstrated that CaClOH content significantly influences the behavior of the material. Empirical laws were also developed to determine the mechanical and physical behavior of mixtures of industrial MSWI ash and slag. The parameters of these models were A/S, W/(A+S), and the water temperature. Then, using the various models developed, an optimum formulation of the MSWI ash and slag mixture was developed, which fulfils the requirements of French Regulations.","PeriodicalId":425482,"journal":{"name":"\"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete\"","volume":"272 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":"115962771","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

Supplementary Cementing Materials: Their Acceptance in Australian Specifications 补充胶结材料:在澳大利亚规范中的接受

"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete" Pub Date : 1998-06-01 DOI: 10.14359/5995

D. Baweja, P. Nelson

{"title":"Supplementary Cementing Materials: Their Acceptance in Australian Specifications","authors":"D. Baweja, P. Nelson","doi":"10.14359/5995","DOIUrl":"https://doi.org/10.14359/5995","url":null,"abstract":"A large proportion of concrete placed in Australia contains one or more supplementary cementing materials (SCM's; either fly ash, ground granulated blast-furnace slag or silica fume). Despite this, specifications for technically advanced projects often restrict their use even though Australian research data justifying their application dates back to the early 1960's for fly ash and slag, and the early 1970's for silica fume. World-wide research on SCM's in concrete dates back even longer. It is the task of the researcher together with the technical marketer to provide effective transfer of this knowledge to the specifier. In most cases, the specifier is either a civil or structural consultant, or a design team within a major public authority or contracting firm. The specifier increasingly needs to seek up-to-date knowledge in concrete technology, a task that is ever more difficult with imposed time constraints. This study maps the processes whereby research and development data are put into practice. A three-stage process is used to investigate this. First, measurements of the technology transfer process are obtained through targeted surveys of concrete specifiers with the objective of determining their attitudes and knowledge regarding SCM's. Second, recent Australian specifications for SCM concrete comprising Standards, Codes of Practice and selected project specifications are reviewed. Third, the data generated is examined to highlight present shortcomings in the technology transfer process in Australia, specifically relating to the use of SCM's. It is concluded that many project specifications with respect to the use of SCM's in concrete can be significantly improved from the standpoint of the supplier, the specifier and the facility owner. This can be facilitated through improved technology transfer. Discussion in the paper focuses on increasing the efficiency of the process for taking research into field application.","PeriodicalId":425482,"journal":{"name":"\"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete\"","volume":"106 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":"122440691","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

Water Permeability of High Slag Content Concrete 高矿渣掺量混凝土的透水性

"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete" Pub Date : 1998-06-01 DOI: 10.14359/6008

J. Nakamoto, K. Togawa, T. Miyagawa, M. Fujii

{"title":"Water Permeability of High Slag Content Concrete","authors":"J. Nakamoto, K. Togawa, T. Miyagawa, M. Fujii","doi":"10.14359/6008","DOIUrl":"https://doi.org/10.14359/6008","url":null,"abstract":"The purpose of this study was to determine the water permeability of high slag content concrete (HSCC) incorporating large amounts of ground granulated blast-furnace slag (GGBS) of high fineness. The main variables are the replacement level of slag, the fineness of slag and the type of chemical admixtures. The slag content in cement ranged from 0 to 95% by weight of total cementitious materials and the fineness of slag ranged from 404 to 1200 m squared/kg. Within the range of this study, the following results were obtained: 1. The coefficient of water permeability of high slag content (HSC) concrete increased as the content of ground granulated blast-furnace slag (GGBS) was increased. However the water tightness of HSC concretes could be improved by utilizing high fineness slag within the range of 122 m squared/kg, and was further improved by utilizing an air entraining and high range water reducing (AEHW) admixture. 2. Both the total porosity and mean diameter of pores increased by raising the slag content, but decreased as the fineness of slag increased. The water permeability of HSC concretes was closely related to the porosity, with the diameter over the certain threshold value, rather than to the mean diameter of pores.","PeriodicalId":425482,"journal":{"name":"\"SP-178: Sixth CANMET/ACI/JCI Conference: FLy Ash, Silica Fume, Slag & Natural Pozzolans in Concrete\"","volume":"8 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":"132463055","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

"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