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
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.
American Concrete Institute
38800 Country Club Dr.
Farmington Hills, MI
Feedback via Email
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.
Title: Properties of Concrete Made with New Cement Dispersing Agent for Retempering
Author(s): M. Aba, M. Shoya, K. Tokuhashi, T. Kamata, and D. Mito
Publication: Special Publication
Appears on pages(s): 173-186
Keywords: cement dispersing agent; durability; freshly mixed concrete; micro structure of concrete.
Abstract: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.
Click here to become an online Journal subscriber