SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology最新文献_第6页

Properties and Application of Environmentally Friendly Porous Concrete 环保多孔混凝土的性能及应用

SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology Pub Date : 1998-06-01 DOI: 10.14359/6035

M. Tamai, T. Matsukawa

引用次数: 5

Application of Recycled Concrete for Structural Concrete- Experimental Study on the Quality of Recycled Aggregate and Recycled Aggregate Concrete 再生混凝土在结构混凝土中的应用——再生骨料和再生骨料混凝土质量的试验研究

SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology Pub Date : 1998-06-01 DOI: 10.14359/6087

Y. Dosho, M. Kikuchi, M. Narikawa, A. Ohshima, A. Kôyama, T. Miura

引用次数: 41

Pull-Out Behavior of High Yield Strength Steel Deformed Bars Embedded in High Strength Concrete 高屈服强度钢变形钢筋嵌入高强混凝土中的拉拔行为

SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology Pub Date : 1998-06-01 DOI: 10.14359/6083

M. Lorrain, O. Maurel

{"title":"Pull-Out Behavior of High Yield Strength Steel Deformed Bars Embedded in High Strength Concrete","authors":"M. Lorrain, O. Maurel","doi":"10.14359/6083","DOIUrl":"https://doi.org/10.14359/6083","url":null,"abstract":"In this paper, the authors present results of an experimental program carried out to study the pull-out behavior of a new type of high yield strength steel deformed reinforcing bars (f sub y = 830 MPa) embedded in high strength concrete (f sub c = 100 MPa). Influence of embedded length, concrete strength and yield steel strength on bond strength has been investigated by means of pull-out tests. The final aim of this research program is to define design and specification requirements for this new material. Variations of the average ultimate bond strength with embedded length, for concretes with compressive strength from 40 MPa to 100 MPa, produce horizontal curves, which indicates that the mean ultimate bond stress is an appropriate bond strength indicator. Ultimate bond strength increases proportionally with both the increase of tensile strength and compressive strength of concrete. No significant effect of the yield steel strength of reinforcement on the value of the mean ultimate bond stress has been observed. In the case of a pull-out failure, the relationships between the ultimate mean bond stress and the main characteristics of the bond between steel and concrete (embedded length, mechanical strengths of concrete and yield steel strength) are similar to the ones of standard deformed reinforcement (f sub y = 500 MPa).","PeriodicalId":255305,"journal":{"name":"SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology","volume":"155 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":"134347675","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

Influence of the Sulfate Level in the Clinker Phase on the Performance of Superplasticized Concretes 熟料相硫酸盐含量对超塑混凝土性能的影响

SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology Pub Date : 1998-06-01 DOI: 10.14359/6044

L. Coppola, R. Troli, P. Zaffaroni, M. Collepardi

{"title":"Influence of the Sulfate Level in the Clinker Phase on the Performance of Superplasticized Concretes","authors":"L. Coppola, R. Troli, P. Zaffaroni, M. Collepardi","doi":"10.14359/6044","DOIUrl":"https://doi.org/10.14359/6044","url":null,"abstract":"Portland cement contains sulfur compounds from the clinker phase and from added calcium sulfate (e.g., gypsum) which acts as a set regulator. The purpose of this investigation was to study the influence of the sulfate content in the clinker phase on the performance of superplasticized concrete mixtures in terms of initial slump level at a given water-cement ratio (0.45), slump-loss rate, and compressive strength at early and later ages. Two batches (A and B) of clinker from the same kiln source were studied, the main difference being the content of sulfate (SO3) in the clinker (0.72% and 1.40%, respectively). Different percentages of natural gypsum, as wet regulator, were interground in a laboratory mill to manufacture portland cements: A1, A2, A3 from clinker A, and B1, B2, B3 from clinker B. Three levels of total sulfate content in terms of SO3 were set: 3.0% in portland cements A1 and B1; 3.5% in portland cements A2 and B2; 4.0% in portland cements A3 and B3. At a given sulfate content in portland cement, the lower the clinker sulfate content, the more effective is the slump increase of the concrete caused by the superplasticizer addition. Moreover, the lower is the clinker sulfate content, the lower is the slump-loss rate of the superplasticized concrete mixture. Finally, at a given water-cement ratio, there is a reduction in the compressive strength at early ages (</= 3 days) when the low sulfate clinker is used to manufacture portland cements. These results are related to the effect of the clinker sulfate content on the degree of cement hydration: the lower the clinker sulfate content, the lower the early cement hydration in terms of gypsum consumption, ettringite formation, and tricalcium silicate (alite) hydration.","PeriodicalId":255305,"journal":{"name":"SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology","volume":"520 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":"133631588","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

Cracking Tendency of High Strength Lightweight Aggregate Concrete at Early Ages 高强轻骨料混凝土早期开裂倾向研究

SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology Pub Date : 1998-06-01 DOI: 10.14359/6031

T. A. Hammer, Ø. Bjøntegaard, E. J. Sellevold

{"title":"Cracking Tendency of High Strength Lightweight Aggregate Concrete at Early Ages","authors":"T. A. Hammer, Ø. Bjøntegaard, E. J. Sellevold","doi":"10.14359/6031","DOIUrl":"https://doi.org/10.14359/6031","url":null,"abstract":"The use of high strength normal weight and lightweight aggregate concrete (i.e., with water/binder ratios below 0.40) have shown that the concrete may be more sensitive to cracking the first hours and days after casting (due to autogenous shrinkage and thermal strains) than normal strength concretes. Two test rigs have been built in order to investigate the problem. The \"Shrinkage-Rig\" determines the \"free\" deformations (e.g., autogenous and thermal deformations), and the special \"Stress-Rig\" determines the stresses when the concrete is restrained against the deformations. The paper presents the results from testing of one high strength normal weight concrete and one high strength lightweight aggregate concrete, both with water/binder ratio 0.38, in the test rigs. Both concretes were exposed to two different temperature histories generated from heat of hydration. The normal weight concrete developed relatively high tensile strains during cooling phase. The corresponding stresses in the Stress-Rig became very high, and in one case the concrete failed. The lightweight aggregate concrete, however, did not develop any tensile strain, due to a lack of autogenous shrinkage caused by the water supply from the lightweight aggregate grains. Consequently, no severe tensile stresses were built up in the Stress-Rig.","PeriodicalId":255305,"journal":{"name":"SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology","volume":"29 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":"114682215","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

Some Durability Considerations in the Design of the Confederation Bridge 联邦大桥耐久性设计中的一些考虑

SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology Pub Date : 1998-06-01 DOI: 10.14359/6028

W. Langley, G. Forbes, E. Tromposch

{"title":"Some Durability Considerations in the Design of the Confederation Bridge","authors":"W. Langley, G. Forbes, E. Tromposch","doi":"10.14359/6028","DOIUrl":"https://doi.org/10.14359/6028","url":null,"abstract":"Transportation to and from Prince Edward Island, Canada's smallest province, has been by ferry for the past century. The cost to operate the ferry system became an increasing burden for the Canadian government and a proposal call was solicited in 1987 to the private sector to construct and operate an alternate system to the Province of Prince Edward Island. A proposal was accepted for a private consortium to build a 12.9 km bridge from the mainland to Prince Edward Island. The bridge was completed in May, 1997. A precast concrete, post-tensioned segmental box girder structure was selected for the site. A requirement of the Government of Canada was that the design and construction of the bridge provide a structure with a design life of 100 years. The bridge is located in a harsh marine environment, with some 100 annual cycles of freezing and thawing. Ice floes which originate in Northern waters pass through the Northumberland Strait in the winter and early spring months. Water temperatures vary from about -2 deg C in the winter months to +18 deg C in the summer. The salinity of the water in the Northumberland Strait is approximately 3.5%. This paper presents some of the durability concerns which were considered during the design and construction of the bridge and describes how these concerns were addressed. The discussion covers concrete materials and mixtures, air content and slump, chloride ingress, alkali-aggregate reactivity, sulphate attack, freezing and thawing resistance, ice abrasion, salt scaling, thermal cracking, and concrete curing.","PeriodicalId":255305,"journal":{"name":"SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology","volume":"57 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":"130539120","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

Performance of Solid Concrete Pavers Under Freeze-Thaw and Deicing Salt Environments of Newly Adopted ASTM C 1262 Test Method 新采用的ASTM C 1262试验方法在冻融和除冰盐环境下固体混凝土摊铺机的性能

SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology Pub Date : 1998-06-01 DOI: 10.14359/6073

N. Ghafoori, S. Kassel

引用次数: 0

Punching Shear Resistance of High Strength Concrete Flat Slabs Reinforced with Steel Fibers and Transverse Reinforcement 钢纤维加横向配筋高强混凝土平板抗冲剪性能研究

SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology Pub Date : 1900-01-01 DOI: 10.14359/6054

J. B. Hanai, Enz Vargas

引用次数: 1

Influence of Desalination on Behavior of Prestressing Steel 脱盐对预应力钢性能的影响

SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology Pub Date : 1900-01-01 DOI: 10.14359/6045

T. Ueda, A. Hattori, T. Miyagawa, M. Fujii, S. Mizoguchi, M. Ashida

引用次数: 0

Effects of Protective Methods Against Salt Damage for New Prestressed Concrete Bridge 新型预应力混凝土桥梁防盐损伤防护措施的效果

SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology Pub Date : 1900-01-01 DOI: 10.14359/6046

Y. Takizawa

引用次数: 0