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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:
SP121-25
Date:
November 1, 1990
Author(s):
G. Petkovic, R. Lenschow, H. Stemland, and S. Rosseland
Publication:
Symposium Papers
Volume:
121
Abstract:
Fatigue properties of high-strength concrete in compression were studied. Two types of normal-density concrete and one type of lightweight aggregate concrete have been tested. The numbers indicate the planned mean strength in MPa of 100 x 100 x 100 mm cubes. The influence of different moisture conditions was studied in an introductory investigation. Three different sizes of cylinder were tested for each of the three curing and testing conditions: in air, sealed, and in water. The tests showed that the fatigue properties of both the air and water conditions were scale-dependent, while the sealed condition was hardly influenced by the sizes of the specimens. The main investigation dealt with the influence of the variation in stress levels on the fatigue life. Test conditions with constant maximum stress levels showed significantly longer lives when the stress range was reduced. If the load levels were defined relative to the static strength, there was no obvious difference between the fatigue properties of the concrete qualities included in these tests. An additional investigation was performed on ND95 cylinders exposed to different combinations of cyclic load levels. It was found that initial cycling at lower load levels was beneficial for the fatigue life at the higher load levels. Based on the results of the experimental work, a design proposal for fatigue of concrete in compression was established.
DOI:
10.14359/3740
SP121-02
H. Aoyama, T. Murota, H. Hiraishi, and S. Bessho
A National Project lasting five years has been promoted by the Ministry of Construction of Japan since 1988 to develop super high-rise reinforced concrete buildings in seismic zones. The strength of concrete and reinforcing steel bars ranges from 30 to 120 MPa (4.3 to 17.4 ksi) and from 400 to 1200 MPa (58 to 174 ksi), respectively. The following is investigated in the Project: 1) production, quality control, and placement of high-strength concrete; 2) production of high-strength steel bars; 3) mechanical properties of high-strength concrete and steel bars; 4) behavior of members and subassemblages; and 5) structural design methodology.
10.14359/3638
SP121-11
K. Cederwall, B. Engstrom, and M. Grauers
The results of 18 tests on slender composite columns consisting of rectangular hollow steel sections filled with concrete are presented. The columns had a length of 3 m and a cross section of 120 x 120 mm. They were simply supported and the load was normally applied with an eccentricity of 20 mm. As a reference, the squash load was evaluated with tests on short columns (stub tests). The purpose of this study was to evaluate the possible advantages of high-strength concrete, confining effects of composite sections, and the shear transfer at the interface. Basic parameters that varied between the tests were: concrete compressive strength, steel yield stress, and thickness of the steel tube. In additional tests, the effect of load eccentricity, additional reinforcement in the column, debonded interface, and the way of load application were examined. These tests showed that the load-bearing capacity, as well as the ductility in the ultimate state, increased for these eccentrically loaded columns.
10.14359/2838
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
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
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