SP-261: 10th ACI International Conference on Recent Advances in Concrete Technology and Sustainability Issues最新文献

Hydration Properties of Calcium Sulfoaluminate-Portland Cement Blends 硫铝酸钙-硅酸盐水泥共混物的水化性能

SP-261: 10th ACI International Conference on Recent Advances in Concrete Technology and Sustainability Issues Pub Date : 2009-10-01 DOI: 10.14359/51663210

M. Bianchi, F. Canonico, L. Capelli, M. Pace, A. Telesca, G. Valenti

引用次数: 11

Properties of Concrete Made with New Cement Dispersing Agent for Retempering 新型水泥分散剂再回火混凝土性能研究

SP-261: 10th ACI International Conference on Recent Advances in Concrete Technology and Sustainability Issues Pub Date : 2009-10-01 DOI: 10.14359/51663209

M. Aba, M. Shoya, K. Tokuhashi, T. Kamata, D. Mito

{"title":"Properties of Concrete Made with New Cement Dispersing Agent for Retempering","authors":"M. Aba, M. Shoya, K. Tokuhashi, T. Kamata, D. Mito","doi":"10.14359/51663209","DOIUrl":"https://doi.org/10.14359/51663209","url":null,"abstract":"This paper describes how it has been pointed out in recent years that many concrete structures are likely to accrue the initial defects in construction work because of the massive and complicated configuration and function of concrete structures. The service life of concrete structures and the structural performance will be lowered due to loading and environmental attack such as carbonation, frost action, and drying shrinkage. In the last few decades, various types of chemical admixtures have been developed, with emphasis on making highly durable concrete and on producing highly flowable concrete for self-compacting. A new cement dispersing agent for retempering, denoted as cement dispersing agent (CDA) was examined in this paper to confirm its effect on fundamental properties of concrete. This chemical agent is used not only to improve the performance on vibrating consolidation of fresh concrete, but also to increase the resistance to segregation of concrete. The addition of agent will promise the dispersion of cement particles and the reduction of bleeding of concrete. The CDA is a negative ion type cement dispersing agent having a main component of Polyester fiber. The benefit of CDA is given in the dosage of a small amount of agent (0.5~1.0g/m3). The improvement in vibrating consolidation of fresh concrete was depended on late addition for retempering. It was observed by the vibrating table-type consistency meter. From the tests for bleeding, setting, mechanical properties, durability, and micro structures of concrete such as Vickers hardness and pore size distribution, the benefit of CDA was also confirmed.","PeriodicalId":232163,"journal":{"name":"SP-261: 10th ACI International Conference on Recent Advances in Concrete Technology and Sustainability Issues","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131055665","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

Durability of Ultra-High-Performance Concrete 超高性能混凝土的耐久性

SP-261: 10th ACI International Conference on Recent Advances in Concrete Technology and Sustainability Issues Pub Date : 2009-10-01 DOI: 10.14359/51663198

C. Pfeifer, B. Moeser, C. Giebson, J. Stark

引用次数: 40

Investigation of the Type of Supplementary Cementing Materials on the Durability of Self-Consolidating Concrete 补充胶凝材料对自固结混凝土耐久性的影响研究

SP-261: 10th ACI International Conference on Recent Advances in Concrete Technology and Sustainability Issues Pub Date : 2009-10-01 DOI: 10.14359/51663208

M. Sonebi, S. Stewart, J. Condon

{"title":"Investigation of the Type of Supplementary Cementing Materials on the Durability of Self-Consolidating Concrete","authors":"M. Sonebi, S. Stewart, J. Condon","doi":"10.14359/51663208","DOIUrl":"https://doi.org/10.14359/51663208","url":null,"abstract":"This paper describes how self-consolidating concrete (SCC) is designed to exhibit high deformability and moderate viscosity to maintain homogeneity and adequate stability to fill the formwork, and encapsulate the reinforcement without any mechanical vibration. Any concrete should have high impermeability and low chloride diffusion to reduce the risk of corrosion and enhance service life. In this study, the effect of the replacement content of cement by supplementary cementing materials (SCM) and fillers. Limestone powder (LSP) replacement of 15% to 30%, ground granulated blast furnace slag (GGBS) of 40% to 60%, and pulverized fly ash (PFA) of 20% to 35% is evaluated on the durability of SCC of grade C40/50. Fresh concrete properties and development of compressive strength were also evaluated. For the durability performance, all mixtures were tested at 28 days for the air permeability, water permeability, sorptivity, and chloride diffusion which were assessed by Autoclam, and Permit tests. The chloride migration coefficient was dependent on the type SCM and filler in use. The most durable SCC mixture, taking into consideration overall properties, was found to be the one containing 20% PFA, which showed low capillary water absorption, water and air permeation, and lower ionic diffusivity in comparison to the other mixtures. In general, SCC mixtures containing GGBS exhibited inferior performance regarding air and water permeability and sorptivity, but had satisfactory chloride resistance. SCC with 50% of GGBS demonstrates the lowest chloride diffusivity.","PeriodicalId":232163,"journal":{"name":"SP-261: 10th ACI International Conference on Recent Advances in Concrete Technology and Sustainability Issues","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114952939","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

The Role of Paste Volume on Performance of Concrete 膏体体积对混凝土性能的影响

SP-261: 10th ACI International Conference on Recent Advances in Concrete Technology and Sustainability Issues Pub Date : 2009-10-01 DOI: 10.14359/51663211

G. Hermida, M. Moranville, R. Flatt

引用次数: 9

Compressive Strength of Lightweight High-Strength Concrete Subjected to High Temperatures 高温下轻质高强混凝土的抗压强度

SP-261: 10th ACI International Conference on Recent Advances in Concrete Technology and Sustainability Issues Pub Date : 2009-10-01 DOI: 10.14359/51663218

Gyuyong Kim, Y. S. Kim, T. G. Lee

引用次数: 1

Optimization of Self-Consolidating Pastes Containing Limestone Powder and Chemical Admixtures 石灰石粉与化学外加剂自固结膏体的优化

SP-261: 10th ACI International Conference on Recent Advances in Concrete Technology and Sustainability Issues Pub Date : 2009-10-01 DOI: 10.14359/51663205

J. Kwasny, M. Sonebi, P. Basheer

引用次数: 3

Rheology and Pumping of Self-Compacting Concrete 自密实混凝土流变学与泵送

SP-261: 10th ACI International Conference on Recent Advances in Concrete Technology and Sustainability Issues Pub Date : 2009-10-01 DOI: 10.14359/51663203

D. Feys, G. Schutter, R. Verhoeven

{"title":"Rheology and Pumping of Self-Compacting Concrete","authors":"D. Feys, G. Schutter, R. Verhoeven","doi":"10.14359/51663203","DOIUrl":"https://doi.org/10.14359/51663203","url":null,"abstract":"Self-compacting concrete is a very flowable cementitious material, which does not need external vibration during casting. On the other hand, somewhat surprisingly, pumping of self-compacting concrete requires higher pumping pressures than traditional concrete. This paradox can be fundamentally explained by studying the rheological properties of self-compacting concrete and linking them to pumping operations. \u0000This paper describes full-scale pumping tests on self-compacting concrete. The first part deals with the influence of the rheological properties of the concrete on the pumping process, showing that viscosity and shear thickening have a major importance. The second part discusses the influence of pumping on the rheological properties of the concrete, clearly showing a decrease in viscosity due to pumping. Structural breakdown and air content change the rheological properties of the SCC. If structural breakdown dominates the effects of the air content, the yield stress and plastic viscosity will decrease, and the SCC will show a larger tendency to segregate. If the effects of the air content dominate, the yield stress of the SCC will increase, possibly leading to improper filling of the formwork.","PeriodicalId":232163,"journal":{"name":"SP-261: 10th ACI International Conference on Recent Advances in Concrete Technology and Sustainability Issues","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123602350","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

Effect of Different Fibers and Mineral Additions on the Performance of FRSCC 不同纤维和矿物添加量对FRSCC性能的影响

SP-261: 10th ACI International Conference on Recent Advances in Concrete Technology and Sustainability Issues Pub Date : 2009-10-01 DOI: 10.14359/51663207

Corinaldesi, G. Moriconi

引用次数: 4

Slab-on-Ground Case Studies about Synthetic Fiber-Reinforced Concrete 合成纤维增强混凝土楼板地面工程实例研究

SP-261: 10th ACI International Conference on Recent Advances in Concrete Technology and Sustainability Issues Pub Date : 2009-10-01 DOI: 10.14359/51663202

C. Macdonald

引用次数: 0