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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:
SP94-47
Date:
July 1, 1987
Author(s):
T. Hara and T. Otsuka
Publication:
Symposium Papers
Volume:
94
Abstract:
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.
DOI:
10.14359/3364
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
SP94-56
J. Bugler
This paper describes field application problems experienced during the execution of a joint resealing program initiated within the limits of Region 10 (Nassau and Sufflok Counties) in the early 1980s. It describes what was done to overcome these problems. Solutions to such problems involved equipment modification and improved inspection technique. These modifications resulted in the virtual elimination of joint overfilling and a ten-fold performance improvement with regards to first-year intermittent bond adhesion failure. Worker safety and protection are discussed.
10.14359/3767
SP94-57
J. Breen
The paper is the text of the keynote address presented at the Second World Congress on Joint Sealing and Bearing Systems for Concrete Structures. The speech centers on Breen's structural engineering experience with reinforced and prestressed concrete and long-span bridges.
10.14359/3777
SP94-41
R. Price
The Texas State Department of Highways and Public Transportation has developed through laboratory testing a material specification for elastomeric concrete and for use as expansion joint nosing material. The elastomer is specified by physical properties such as tensile stress, elongation, bond strength, and compressive resilience. Physical properties are determined after short-term curing and long-term oven aging. To date, approximately 4000 ft (1219 m) of joint has been placed according to this specification. Although the oldest installation is only one year old, the performance of the joints has been excellent. An experimental installation, scheduled for August 1986, includes four different elastomeric concretes in approximately 1500 ft (457 m) of joint. The performance of these joints will be correlated with physical property testing and used to improve the existing specification.
10.14359/3408
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