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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 53 Abstracts search results
Document:
SP172-46
Date:
December 1, 1999
Author(s):
Byung-Hwan Oh, WonKi Chung, Seun-Yup Chang and Kyu-Jung Lee
Publication:
Symposium Papers
Volume:
172
Abstract:
The present study was to develop high-durability concrete(HDC) and to apply it to actual structures. For the improvement of durability of concrete structures, the appropriate mixture proportions with mineral admixtures or slag (fly ash, silica fume, blast-furnace slag) have been selected and applied to various experimental studies. Two ievels of strength such as high and normal strength concretes have have been considered. Various durability tests including resistance to freezing and thawing, resistance to steel corrosion, resistance to sulfate attack, and permeability were performed and the durability characteristics for each mixture proportion have been analyzed to develop high-durability concrete. In addition, several in-situ applications of HDC, i.e., tetrapod at Tangjin power plant, a reinforced concrete slab bridge at Euwang, and sewage treatment structure at Gayang, were executed and investigated. Then, the results of field applications were discussed with those of laboratory tests.
DOI:
10.14359/6168
SP172-27
Sidney Mindess, Perry Adebar and Julien Henley
An experimental study aimed at investigating the influence of hooked steel fibers on improving the structural performance of high strength concrete (HSC) members is described. Six columns were tested to investigate the ability of fibers to prevent premature cover spalling in HSC columns. While the final appearance of the columns was influenced by the presence of fibers, the axial capacity was unaffected. Eight elements constructed with concretes ranging in strength from 25 to 95 Mpa were tested under shear dominated loading. The addition of fibers changed the failure mode from brittle shear to a more ductile flexure/shear mode (diagonal cracking after significant flexural ductility). Eleven large size (600 mm deep) beam elements were also tested. Due to the addition of fibers, shear strength increases as high as 117 % were observed in these members.
10.14359/6149
SP172-48
E. P. Kearsley and H. F. Mostert
Foamcrete, also known as foamed or cellular concrete is a lightweight material that can be used for the development of infrastructure to the benefit of disadvantaged communities. The objective of this paper is to discuss the tests conducted on foamcrete using South African materials. The cost of foamcrete can be reduced by replacing large percentages of the cement with ungraded ash. This replacement does not lead to noticeable reductions in compressive strength, but the shrinkage is markedly reduced. Reinforcing bars can be used in foamcrete but although no problems have been encountered with bond, the low shear strength of foamcrete can lead to premature failure. The use of chopped polypropylene fiber improves the shear behavior of small structural elements to the extend that the load-deflection behavior of foamcrete beams are similar to that of comparable normal concrete beams.
10.14359/6170
SP172-16
Sun Wei, Pan Ganghua and Ding Dajun
In this paper, a technic of both adding ultra-fine fly ash(UFFA) and silica fume(SF) for preparing high performance concrete(HPC) of C150~200 is presented. Under the condition of replacing 15% cement with UFFA or SF or their composite respectively, the strength characters of HPC with the same proportion of both UFFA and SF were systematically studied by comparing adding-both UFFA and SF sample(HPFASFC--- high performance’ fly ash and silica fume concrete) with adding only UFFA sample(HPFAC---high performence fly ash concrete) and adding only SF sample(HPSFC---high performence silica fume concrete). The experimental results showed that the strength of HPFASFC may be higher than that of HPSFC or HPFAC because of existence of effects of promoting and making up each other in strengthening of mineral admixture. The results of micro tests and analysis for the mechanism of composite effects proved the conclusion. It follows that there is a possibility for preparing high performance concrete with UFFA.
10.14359/6138
SP172
Editor: V.M. Malhotra
SP-172 The theme of the Third ACI International Conference in Malaysia in 1997 was "High-Performance Design and Materials and Recent Advances in Concrete Technology". Over 90 papers were submitted and reviewed, and 52 were accepted for this publication.
10.14359/14170
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