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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 64 Abstracts search results

Document: 

SP70

Date: 

January 1, 1981

Author(s):

Editor: Stewart C. Watson

Publication:

Symposium Papers

Volume:

70

Abstract:

SP70 The proceedings of the World Congress on Joint Sealing and Bearing Systems for Concrete Structures reports on new developments and case histories. General subjects include: movements and forces, bearings, joints, materials, architectural applications, seismic considerations, pavements, and research and development.

DOI:

10.14359/14122

Document: 

SP70-27

Date: 

January 1, 1981

Author(s):

Joe T. Baker, Richard W. Kinchen, and Norval P. Knapp

Publication:

Symposium Papers

Volume:

70

Abstract:

In the decade of the '70s, the Louisiana Department of Transportation and Development began sealing almost all its bridge deck joints to stop leakage and thus prevent structural and aesthetic degeneration of its sub-structures. Research sponsored by the State and Federal Governments revealed that neoprene compression seals out-performed pourable ones in sealing bridge deck joints two inches (five cm) or less in width. Technology then lured the Department towards longer span lengths susceptible to greater thermal- and deflection-related movements. Industry took the hint and responded with an array of metal-reinforced or metal-retained neoprene joint assemblies intended to accommodate bridge movement in a watertight fashion. By 1979 the Department had specified approximately a dozen different models of these proprietary bridge deck joint assemblies, observed both good and bad field performance therefrom, and knew that additional products would yet be marketed. The Department then resolved that a joint state and federal team would be formed to (1) evaluate the sealing properties, rideability, and maintenance requirements of available joint seal systems, (2) develop and maintain a qualified products list for the subject seal systems, and (3) develop and maintain a standard plan listing approved seals, installation procedures, and other necessary notes. This team concept has been implemented, with members representing design through maintenance. Although in its infancy, the idea holds great promise as a clearinghouse for communications and decisions regarding bridge deck joint seal sys terns.

DOI:

10.14359/17425

Document: 

SP70-23

Date: 

January 1, 1981

Author(s):

E. Cziesielski

Publication:

Symposium Papers

Volume:

70

Abstract:

The standards governing construction joint seals are discussed and the demands placed on them described. The present methods of sealing joints to prevent rain penetration are discussed in terms of their advantages and drawbacks. The following joint constructions are described: mastic seals, tape seals, gaskets, open joints and two-stage joints. When a joint of whatever kind is properly constructed, loss of heat by transmission and by air leakage may be neglected. A method is discussed to determine the influence of joints on noise reduction. By filling joints with flexibld asbestos foam a fire resistance time of over 90 minutes can be achieved. Finally, experiences made in West Germany with various types of joint are described: mastic seals have shown a high rate of damage, while two-stage joints have performed well -- no damage reports have come in. Tape seals are expected to show high life-expectancy.

DOI:

10.14359/17421

Document: 

SP70-24

Date: 

January 1, 1981

Author(s):

C. R. Cook and A. P. Goel

Publication:

Symposium Papers

Volume:

70

Abstract:

This paper discusses the various joints in use in water retaining structures with particular reference to those in the water and sewage treatment plants and structures. The location and spacing of both construction and movement joints from both the viewpoint of structural requirements and construction practices are considered. Joint materials are discussed and present practices regarding their use are reviewed.

DOI:

10.14359/17422

Document: 

SP70-25

Date: 

January 1, 1981

Author(s):

Joseph F. Lamond

Publication:

Symposium Papers

Volume:

70

Abstract:

This paper presents the state of the art in sealing joints in tunnels using precast concrete segments. With the development of the tunnel boring machine initial and final lining of a tunnel can be accomplished in a single operation using precast concrete segments. Factors which effect the joint sealing are the alignment accuracy of the tunnel boring machine; the geometry of the joints; and the joint sealing system. The manufacturing tolerances, particularly at the edges and corners, have to be considered in both design and construction. The use of precast concrete segments for tunnel lining is anticipated to be the most economical tunneling method in the future. The proper design and construction of the joint sealing system are the most important features in the precast concrete tunnel lining method.

DOI:

10.14359/17423

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