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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 62 Abstracts search results
Document:
SP179
Date:
June 1, 1998
Author(s):
Editor: V.M. Malhotra
Publication:
Symposium Papers
Volume:
179
Abstract:
This Symposium Publication contains the proceedings of the Fourth CANMET/ACI/JCI International Conference held in Tokushima, Japan, in June 1998. Sixty-two refereed papers were accepted for presentation at this conference and for this publication. Note: The individual papers are also available as .pdf downloads.. Please click on the following link to view the papers available, or call 248.848.3800 to order. SP179
DOI:
10.14359/14172
SP179-49
M. Eto, K. Maruyama and S. Ono
The authors have proposed a partially pre-cooling system for massive structures, such as gravity concrete dams. It is discussed in this paper how the effectiveness of the proposed method is discussed using the finite element analysis. In the ordinary pre-cooling system, pre-cooled concrete is placed in the entire region (width and depth) of a massive structure. In the proposed system , pre-cooled concrete is placed only in the surface layer. In order to evaluate the effectiveness of this system, a thermal stress analysis was conducted by the finite element method. The key parameters were the dimensions of the cooling system and cooling temperatures. The results show that the proposed system is rather effective than the conventional cooling system in terms of the thermal stress condition of massive concrete structures. In addition, the cost benefit is adequately expected.
10.14359/10135
SP179-61A
Y. Dosho, M. Kikuchi, M. Narikawa, A. Ohshima, A. Koyama and T . Miura
A study on application of recycled concrete for structural concrete was carried out under the concept of life cycle assessment (LCA) for environmental management of construction utilizing recycled products. Such products are often discarded, when existing electric power plants are rebuilt or upgraded in order to meet increasing power demands. In pursuing the reuse of these recycled materials, the basic policy was composed of three items: (1)the assurance of quality; (2)the reduction of environmental impact; and, (3)construction cost. The study is divided into two main parts: feasibility study on the reuse of recycled concrete and, experimental study on the quality of recycled aggregate and recycled aggregate concrete. This quality o Paper aper presents the result of the experimental study on the recycled aggregate and recycled aggregate concrete. Based on the investigation and the analysis of results, valuable data were obtained regarding concept and practice as to the reuse of construction debris based on LCA.
10.14359/6087
SP179-60
J. Nakamoto, K, Togawa, T. Miyagawa, M. Fujii and S. Nagaoka
It is essential that concrete structures should withstand the conditions for which it has been designed for long periods of time. The lack of durability may be caused either by the environment to which the concrete is exposed or by the concrete itself. In this study, the resistance to freezing and thawing of high-slag content concrete(HSC concrete), which is one of the external causes, have been discussed for the purpose of utilizing the ground granulated blast furnace slag (GGBS) as an ingredient of cement. The slag content in cement ranged from 0 to 9.5 % by weight of total cementitious materials and the fineness of slag was 816 m*/kg. The resistance of air entrained (AE) concrete with a slag content of 70% was superior or comparable to that of slag free concrete, whereas AE concretes have questionable performance in the case of slag content of 85%, and have less ability in the case of 95% slag content with respect to freezing and thawing resistance. HSC concretes could have satisfactory high resistance to freezing and thawing by using an air-entraining high range water-reducing admixture(AEHW admixture), even if the slag content was 95%. Then, the concretes with AEHW admixture, which is called SP concrete, would be recommended for freezing and thawing conditions with respect to the use of HSC concrete.
10.14359/6086
SP179-59
K. Sakata and T. Ayano
Concrete creep and shrinkage strain obtained in constant temperature and constant humidity room are different from those observedinthe actual condition. Most of creep and shrinkage strain prediction equations predict the creep coefficient and shrinkage strain under the constant temperature and constant relative humidity. The effects oftemperaturehistory andrelativehumiditychange of atmosphere are not consideredinthese equations. In this study, the effect of the change of atmosphere condition on creep and shrinkage strain is discussed. It is shown that the concrete creep and shrinkage strain in actual ambient are influenced by casting season of concrete. Creep and shrinkage strain of concrete cast in winter aremuchbigger than those in summer. The significance to consider the effect of environmental change on concrete creep and shrinkage strain is emphasized in this paper.
10.14359/6085
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