Email Address is required Invalid Email Address
In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Learn More
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
Staff Directory
ACI World Headquarters 38800 Country Club Dr. Farmington Hills, MI 48331-3439 USA Phone: 1.248.848.3800 Fax: 1.248.848.3701
ACI Middle East Regional Office Second Floor, Office #207 The Offices 2 Building, One Central Dubai World Trade Center Complex Dubai, UAE Phone: +971.4.516.3208 & 3209
ACI Resource Center Southern California Midwest Mid Atlantic
Feedback via Email Phone: 1.248.848.3800
Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 22 Abstracts search results
Document:
SP261-15
Date:
October 1, 2009
Author(s):
E.B. Lee, G.Y. Kim, K.M. Koo, and H.J. Lee
Publication:
Symposium Papers
Volume:
261
Abstract:
An analysis method for histories of hydration heat and autogenous shrinkage at early ages is suggested in this study. The early age properties and the relation between hydration heat and autogenous shrinkage of high-strength concrete were investigated. In the results, most autogenous shrinkage of high-strength concrete occurred in a few days after casting. The shape of autogenous shrinkage history corresponded well to the shape of hydration temperature history at early ages. There was a close relation between hydration heat and autogenous shrinkage at early ages, especially between hydration heating velocity (HHV) and autogenous shrinking velocity (ASV). And it is noted that HHV can affect the ultimate autogenous shrinkage.
DOI:
10.14359/51663212
SP261-10
V. Corinaldesi and G. Moriconi
In this work, several self-compacting concretes were prepared by using three different types of fibers made of steel, poly-vinyl-alcohol (PVA), high toughness poly-propylene (PPHT), and two different types of mineral addition (limestone powder and powder from recycled concrete). The water-cement ratio (w/c) was in every case equal to 0.40. Fresh concrete behavior was evaluated by means of slump flow, V-funnel, and L-box tests while the hardened concrete behavior was evaluated by means of flexure and compression tests as well as free drying and restrained plastic shrinkage measurements. Excellent performances were generally detected, particularly for the selfcompacting concretes prepared with steel and PPHT fibers.
10.14359/51663207
SP261-13
M. Bianchi, F. Canonico, L. Capelli, M.L. Pace, A. Telesca, and G.L. Valenti
The X-ray diffraction analysis and mercury intrusion porosimetry were employed to investigate the hydration process of calcium sulfoaluminate (CSA)- portland cement blends with C4A3S mass concentration, C3S/C4A3S, and CS/C4A3S mass ratios ranging from 7.7 to 22.0%, 1.0 to 6.5, and 0.5 to 1.2, respectively. Owing to the hydration of adequate C4A3S contents and the generation of sufficient quantities of expansive ettringite, blends with C4A3S amounts as well as C3S/C4A3S and CS/C4A3S values comprised between 17.6 and 22.0%, 1.0 and 1.7, 0.5 and 1.0, respectively, showed high-early strengths and low drying-shrinkage when compared to normal portland cements. The formation of expansive ettringite was associated with concentrated pore distributions and most preferred pore radii ranging from either 47 to 225 or 367 to 896 nanometers, depending on both C3S/C4A3S and CS/C4A3S ratios.
10.14359/51663210
SP261-12
M. Aba, M. Shoya, K. Tokuhashi, T. Kamata, and D. Mito
In recent years, it has been pointed out 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. In this paper, a new cement dispersing agent for retempering, denoted as CDA was examined 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 retmpering. 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.
10.14359/51663209
SP261
Editors: P. Gupta, T.C. Holland, and V.M. Malhotra
This Symposium Publication contains the proceedings from the Tenth CANMET/ACI International Conference on Recent Advances in Concrete Technology, held in Seville, Spain, in October 2009. The 21 papers include Durability of Ultra-High-Performance Concrete; Shrinkage Reducing Effect of a Combination of Internal Curing and Shrinkage Compensating Agents on High-Performance Concrete; and Geopolymer Concrete—Sustainable Cementless Concrete. Note: The individual papers are also available. Please click on the following link to view the papers available, or call 248.848.3800 to order. SP-261
10.14359/51663169
Results Per Page 5 10 15 20 25 50 100