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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:
SP121-13
Date:
November 1, 1990
Author(s):
S.W. Shin, M. Kamara, and S. K. Ghosh
Publication:
Symposium Papers
Volume:
121
Abstract:
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.
DOI:
10.14359/2850
SP121-30
George c. Hoff
Briefly reviews five joint industry-research programs pertaining to offshore concrete structures. These programs were sponsored by the oil and gas industry and related construction industries. These studies, conducted in both North America and Norway, included the use of high-strength, lightweight aggregate concretes in both material and structural evaluations. Selected characteristics of the high-strength, lightweight aggregate concretes used in these studies (such as ductility in reinforced concrete elements, punching shear behavior, and fatigue characteristics) are summarized. Future research needs are discussed.
10.14359/3768
SP121-31
V. M. Malhotra
Reports results of a study undertaken to develop high-strength lightweight concrete having compressive strength of about 700 MPa and a density of less than 2000 kg/m3. The materials used consisted of an expanded shale lightweight aggregate of Canadian origin, ASTM Type III cement, low-calcium fly ash, and condensed silica fume. A series of 7 concrete mixtures involving 14 concrete batches were made. The cement or cementitious material content of the mixtures ranged from 300 to 600 kg/m3. All mixtures were air entrained and superplasticized. A large number of test cylinders and prisms were cast for the determination of mechanical properties and drying shrinkage of concrete. From the results of this investigation, it is concluded that concrete with a compressive strength of about 70 MPa at 365 days and density of less than 2000 kg/m3 can be made incorporating supplementary cementing materials. The highest compressive strength achieved was 69.3 MPa at 365 days for a mixture with a cementitious material content of 600 kg/m3 of concrete; the highest flexural strength obtained was 8.7 MPa at 28 days.
10.14359/2567
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
SP121-16
D. Tachibana, M. Imai, N. Yamazaki, T. Kawai, and Y. Inada
It is more difficult to obtain good workability and to assure high concrete compressive strengths for high-strength concretes than for lower strength concretes. Several admixtures are often used in combination to increase workability of the fresh concrete. Along these lines, two kinds of chemical admixtures and three kinds of mineral admixtures were selected for use in this study. The study was carried out to examine the effects of materials, particularly admixtures, and mix proportions on several properties of freshly mixed and hardened concrete having a compressive strength of more than 100 MPa. This paper reports on the contribution of silica fume to the workability and constructibility, with a focus on improvement of its compressive strength. It is also reported that ground granulated blast furnace slag can be utilized to improve several properties, e.g., control of thermal cracks due to the heat of cement hydration. Furthermore, slump loss characteristics, the resistance to segregation, tensile strength, modulus of elasticity, shrinkage, creep, and freeze-thaw durability, and the alkali-aggregate reactivity were tested.
10.14359/2510
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