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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 39 Abstracts search results
Document:
SP121-18
Date:
November 1, 1990
Author(s):
Hocine Djellouli, Pierre-Claude Aitcin, and Omar Chaalaar
Publication:
Symposium Papers
Volume:
121
Abstract:
High-performance concrete has been made using different cementitious combinations: portland cement and fly ash; portland cement and silica fume, and portland cement, ground granulated slag, and silica fume. The use of a supplementary cementitious material like fly ash or ground granulated slag is not only interesting from an economical point of view but also from a rheological point of view. Replacing in some cases up to 20 percent of cement by a less reactive cementitious material like fly ash or up to 50 percent by ground granulated slag can solve the slump loss problem observed with some very reactive cements when used at water/cement ratios ranging from 0.25 to 0.30. Moreover, the use of a supplementary cementitious material results in a significant decrease in the superplasticizer dosage needed to achieve a given workability. In terms of rheology, compressive strength, and cost, one of the most promising combinations of cementitious materials for high-performance concrete is a mixture of ground granulated slag, silica fume, and portland cement, when ground granulated slag is available at a reasonable price.
DOI:
10.14359/2531
SP121-17
M. K. Gopalan and M. N. Haque
Compressive strength and water penetration of three grades of high-strength concretes with cement contents ranging from 400 to 500 kg/m3 and a proprietary superplasticizer are reported. The control mixes were redesigned by adding a Class F-type fly ash at fly ash/cementitious ratios of 0.15 and 0.35. All concretes were designed for a similar workability. The strength development was monitored in three curing regimes. It is concluded that the superplasticized concrete developed a higher strength than that predicted from a reduction in the water/cement ratio. The curing conditions significantly influenced the strength development and the water penetration of the concretes. An optimum fly ash/cementitious ratio of 0.15 was found to be appropriate for the concretes; larger amounts of fly ash were found undesirable for higher strength development.
10.14359/2525
SP121-38
Kaare K. B. Dahl
Presents the results of an investigation undertaken at the Technical University of Denmark to determine the parameters that affect the ultimate load capacity of a concrete structure subjected to concentrated loads originating from reinforcement bars bent 90 deg. The following parameters have been found to have a decisive influence on the ultimate load capacity of the concrete bar: bar diameter, internal height of the specimen, side concrete cover, and concrete compressive strength. The results show that the relative load-carrying capacity of the concrete åc / fc decreases for increasing concrete compressive strength. However, the use of high-strength concrete (HSC) still results in an increase in the absolute load-carrying capacity of the concrete whencompared to normal strength concrete (NSC).
10.14359/2870
SP121-13
S.W. Shin, M. Kamara, and S. K. Ghosh
The flexural ductility of ultra-high-strength concrete members (concrete strength ranging up to 15 ksi or 103.4 MPa) under monotonic as well as reversed cyclic loading is experimentally investigated. The investigation under reversed cyclic loading included an examination of the hysteretic behavior of ultra-high-strength concrete members. The applicability of the equivalent rectangular compression concrete stress block of the ACI Building Code to the prediction of flexural strength of ultra-high-strength concrete members is also investigated.
10.14359/2850
SP121-12
L. Bjerkeli, A. Tomaszewicz, and J. J. Jensen
Paper summarizes results obtained as part of a recent research program on high-strength concrete (HSC). In this research, normal density concrete (mean cube strength of 65 to 115 MPa) and lightweight aggregate concrete (mean cube strength of 60 to 90 MPa)
10.14359/2844
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