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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 65 Abstracts search results
Document:
SP164-52
Date:
November 1, 1996
Author(s):
Gilbert T. Blake and Donald W. Pfeifer
Publication:
Symposium Papers
Volume:
164
Abstract:
Preformed fabric (commonly known as "cotton duck") material made to Mil-C-882E specifications has been used for years as vibration isolation pads in structures. High strength characteristics and resistance to bulging make this material well suited for slide bearing and fixed bearing applications. Published behavior data and design guidelines have not been readily available for the use of preformed fabric material. This paper describes the results of a comprehensive test program designed to provide potential users with test data for uniform and nonuniform compression, creep and shear behavior. Based on the resulting data, the authors suggest design parameters for the use of preformed fabric material in structural applications.
DOI:
10.14359/14338
SP164-53
S. M. Sandrossadat-Zadeh
Changes in the temperature and in the moisture content of the concrete cause dimentional changes which , if resisted externally may crack the concrete. The distribution and width of such cracks can he controlled by reinforcement together with the provision of movement joints.The effect of contraction joints on the degree of restraint has been studied by modelling walls with different length to height ratios through a Finite Element pakage.Three different wall end houndry• conditions have been considered .It has been shown that for walls with lower values of length to height ratio implementing partial contraction joint , instead of full contraction joint can result in a more economical design.
10.14359/14339
SP164-47
Till Boettger and Hartmut Bolte
At present, in our research group at the University of Leipzig the following tests are being carried out on selected elastomeric sealants (polysulphide. polyurethane. silicone. and for comparing EPDM and polychloroprene): alternate aging with fluorenscent UV lamps alternate aging with xenon arc lamps thermal aging open air weathering room storage We characterise the change in materials properties through mechanical test methods (tensile strength and elongation at break). thermoanalysis (DSC) and chemical spectroscopy (FT-IR. PAS). The intermediate evaluation of the results shows, that the similarity of the curves of artificial aging and the open air weathering is clearly visible. Additional series of tests have been started with the following goals: prolonging the stress period for artificial aging, so as to better evaluate the long-term curve raising the stress temperature so as to reduce the test time combination of artificial weathering with acid rain combination of artificial weathering with extension and compression verification trials on joint models The tests should be continued until a rapid aging method is found, which produces virtual agreement with that of natural aging.
10.14359/14333
SP164-48
Agostino Marioni
The paper describes an innovative antiseismic device based on steel elements subject to yielding. Through a peculiar geometry of the dissipators and the selection of a particular type of steel the device can grant superior performance for fatigue life and regularity of the hysteresis cycles. The paper describes the tests at reduced and full scale to assess the behaviour of the device and an important application under execution in Turkey.
10.14359/14334
SP164-49
Charles W. Dolan, Rodd W. Merchant and Jay A. Puckett
Standard tests for the evaluation of bridge joint sealants include conditioning of the sealant to simulate in-service environmental exposure. Samples are then tested at room temperature. This research examined the behavior of sealants at environmental working temperatures and reviewed the testing parameters of the ASTM C 719 Specification. The research concluded that many sealants perform poorly at low temperature and that standard specifications should be modified to include low temperature testing and validation of total strain capacity.
10.14359/14335
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