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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 61 Abstracts search results
Document:
SP94-53
Date:
July 1, 1987
Author(s):
V. Kazakavich
Publication:
Symposium Papers
Volume:
94
Abstract:
The principal cause of deterioration to the superstructure and substructure are the expansion joint systems. Bridge engineers and maintenance personnel have long advocated longer spans with fewer and maintenance-free expansion joints. With longer spans, expansion joints have become greater. In 1978, the New York State Department of Transportation invited manufacturers of six different types of modular expansion systems to install their devices on a new structure crossing the Hudson River at Troy, N.Y. This paper is an up-to-date condition survey of the performance conducted on a regular basis of the six different modular expansion joints.
DOI:
10.14359/3440
SP94-60
P. Smith and D. Manning
A research and development session was held at the conclusion of the Second World Congress on Joint Sealing and Bearing Systems for the purpose of identifying the outstanding issues. This paper provides a summary of the proceedings of the session. Needed work on joints and bearings was identified within the following subject areas: bearings, bridges, base isolation, materials, movements, buildings, and pavements. The session concluded by endorsing the concept of a Joint and Bearings Research Council to act as a liaison group between all segments of the industry.
10.14359/3447
SP94-43
W. Berchou
The importance of effectively sealed expansion joints in all types of structures has been recognized for a long time. Bridges, buildings, dams, water/sewage treatment facilities, etc., require weatherproofing expansion joints. This task has become even more difficult, particularly in buildings, with the incorporation of seismic considerations and the increased awareness of "life safety" with regard to pyrogenics. In the event of fire, the expansion joints are primary candidates for the rapid spread of fire and toxic/noxious fumes. Protection is of particular importance in hospital/medical facilities and high-rise structures. The need not only to confine the fire to the point of origin, but to inhibit the spread of fumes, is most crucial. It is estimated that 80 to 90 percent of fire victims succumb to inhalation of smoke/noxious/toxic gases well before the flames reach them. In those cases where the heat and flames reach the victims, the first signs of incapacitation result from toxic fumes. The major North American manufacturers of expansion joint sealing systems are developing composite fire resistive/weatherproof expansion joint sealing systems incorporating a noxious fume barrier that will resist the impact of the "hose stream" from fire-fighting equipment.
10.14359/1682
SP94-32
H. Eggert
Since some national standards on bridge bearings have been issued and a certain level of knowledge seems to have consolidated, the time has come to prepare an ISO Standard. The most important elements that should be part of such an ISO Standard are listed. Contradictions between existing national standards should be clarified and eliminated. Outlived technology should not be part of an international standard while national standards still may specify such bearings for local reasons.
10.14359/3757
SP94-47
T. Hara and T. Otsuka
Tests for four circular segmented tunnel linings are described. Two single-ring specimens had the conventional flat joint and the tongue-and-groove joints at the key segment. The three-ring specimens used a staggered arrangement and had circumferential joints with and without tongue-and-groove configurations. The load was applied from the top and the side wall on the single-ring specimens. The measurements of overall deformation, joint slip at the key segment, and joint opening were used in studies of waterproofing joints of several linings. The type of joint configurations that has been proven satisfactory is the key segment with the tongue-and-groove for the longitudinal joint. This selection is based largely on economic factors. Documented field cases observed in the underground excavations carried out for the electric utility tunnels in the urban areas were presented to investigate the applicable watertightening joint of segmented linings.
10.14359/3364
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