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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 33 Abstracts search results
Document:
SP109-22
Date:
August 1, 1988
Author(s):
A. K. Haug and M. Sandvik
Publication:
Symposium Papers
Volume:
109
Abstract:
To meet the development in structural design and construction methods, a continuous effort has been made to advance the concrete mix design process. Paper gives a survey of the research work in this process. The mix design has to take care of several contradictory requirements, such as high strength and low permeability on one side and moderate heat development and extraordinary workability on the other. From 1972 to 1986, the concrete grade has been increased from C45 to C70 while the workability (slump) has been increased from 120 to 240 mm mainly due to extreme dense reinforcement (above 1000 kg/m3 in local areas). The chemical composition of the cement is aimed at an optimized 28 day compressive strength with moderate heat development. The fine aggregates are produced through a hydraulic process to obtain the desired particle distribution. Minor changes in the finer part of the grading have resulted in remarkable improvements in the workability and pumpability by stabilizing the paste-aggregate matrix. The practical use of very high strength normal density concrete (C80-C100) and high-strength concrete with lightweight aggregates are new challenges for the concrete mix design so as to satisfy new advancements in construction methods.
DOI:
10.14359/2037
SP109-23
G. Singh and L. Ip
Ferrocement has attracted world-wide interest because of its proven suitability for marine structures as well as its potential as a repair material. The first part of the paper describes methodology for accelerated exposure of specimens to the marine environment simulated in the laboratory. The main features of this methodology were: the cyclic temperature and moisture environment, and the preloading of specimens up to the state of cracking before placing them in this environment. The second part reports and discussed the influence of the duration of load and the cyclic environment on the fatigue properties measured from tests performed under cyclic loading. These properties are compared with those of the specimens stored in a normal curing room. Fatigue results obtained from the ferrocement specimens are compared with those from the reinforcing wires tested in the air. The fatigue performance of reinforcement in the air was found to be considerably lower than that in the composite.
10.14359/2048
SP109-24
S. Nishibayashi, S. Inque ,and K. Yamura
Fatigue characteristics of concrete beams were determined under water and in air. Significant differences were observed in the fatigue strengths between the beams tested in water and those in air. The failure pattern of a reinforced concrete beam tested in water occurs as a shear failure but as flexural failure in air. At the same upper load level, the fatigue life of the beam with web reinforcement was approximately 100 times that of the beam without it. The flexural crack width of the specimen in water was lower than that exposed to air. At the same upper load level, however, the deflection and the rate of propagation of the diagonal crack were larger in air.
10.14359/2061
SP109-12
Y. Takagishi, H. Ichikawa, H. Tabuchi, and A. Moriwake
Load-carrying capacity and fatigue strength before and after repairing were investigated for a coastal structure in Tokyo Bay, which was subjected to serious damage by chloride for 15 years. Static and cyclic load tests together with investigation on effectiveness of repair were carried out on specimens taken from the site. It was found that the bearing and yielding capacities of deteriorated slab are 90 and 80 percent, respectively, of those of sound structure. These losses were mainly caused by 10 percent loss of reinforcement corrosion. The specimens repaired by material with high tensile strength suggested brittle failure in static load tests. It was also found that fatigue failure of deteriorated reinforcements was accelerated by pitting corrosion.
10.14359/2761
SP109-30
T. A. Holm, T. W. Bremner, and A. Vaysburd
Concrete ships and bridges incorporating structural lightweight concrete were examined for durability with particular attention given to depth of carbonation. The profile of the carbonation front was determined for these mature structures in or over sea water, and the carbonation front was found not to approach the steel reinforcing even after several decades of exposure. Factors affecting the rate of carbonation are discussed and recommendations are given to limit the extent of carbonation.
10.14359/2114
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