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International Concrete Abstracts Portal

Showing 1-5 of 23 Abstracts search results

Document: 

SP181-04

Date: 

March 1, 1999

Author(s):

A. Gurjar and T. Tang

Publication:

Symposium Papers

Volume:

181

Abstract:

This paper develops a finite-deformation viscoelastic material model to characterize the behavior of a silicone-based sealant material. A series of relaxation tests were performed on the test specimens for different levels of age and unit extension. Based on the experimental results, a master relaxation modulus curve is constructed. Unit extension and age effects are incorporated in the master relaxation curve by using the superposition principle. The shift factor equations developed were based on the relationship first suggested by William, Landel and Ferry (WLF Equation) and traditionally used for incorporating temperature effect. The unit extension and age dependence are accounted in the “reduced time”. The material model derived is of the generalized Maxwell (in parallel) type, which is simple and can be easily applied in finite element programs for stress analysis of joint sealants in concrete pavement.

DOI:

10.14359/5515


Document: 

SP181

Date: 

March 1, 1999

Author(s):

Editor: D.G. Zollinger / Sponsored by: ACI Committee 214 and ACI Committee 325

Publication:

Symposium Papers

Volume:

181

Abstract:

The six papers in this Symposium Publication address many different aspects of mechanistic design, such as environmental stress, improved pavement design methodology, approaches to performance-based specification, characterization of joint sealants for design purposes, characterization of concrete strength based on fracture properties, and others. Note: The individual papers are also available as .pdf downloads.. Please click on the following link to view the papers available, or call 248.848.3800 to order. SP181

DOI:

10.14359/14174


Document: 

SP164V2

Date: 

November 1, 1996

Author(s):

Editor: Barrie Atkinson

Publication:

Symposium Papers

Volume:

164

Abstract:

SP-164 (V2) Although bearing and joint systems comprise only a small percentage of the construction cost of highways, buildings, and bridges (1 percent, typically), their importance to the functioning of those structures is vastly greater. For without adequate engineering effort in design of these vital elements to account for the many, sometimes conflicting, requirements of loading and/or movement, the integrity of the entire structure may be compromised. Our increased understanding of seismic activity has made us more aware of the wider area of this activity as the greater demand placed on support and joint systems. This Fourth (quinquennial) World Congress on Joint Sealing and Bearing Systems in Concrete Structures will enhance the general understanding of these systems and introduce entirely new concepts developed to cater to the latest seismic code requirements. As with the first two Congresses, this is V.2 of a two-volume set. V.1 contains 22 papers, plus the abstracts ofpapers presented at the Third Congress.

DOI:

10.14359/14214


Document: 

SP164V1

Date: 

November 1, 1996

Author(s):

Editor: Barrie Atkinson

Publication:

Symposium Papers

Volume:

164

Abstract:

SP-164(V1) The Fourth World Congress on Joint Sealants and Bearing Systems in Concrete Structures will enhance the general understanding of these systems and introduce entirely new concepts developed to cater to the latest seismic code requirements. This conference was held in Sacramento, California on September 29 through October 3, 1996.

DOI:

10.14359/14204


Document: 

SP164-30

Date: 

November 1, 1996

Author(s):

Moussa A. Issa, Brenda Robinson, Moshen Shahawy

Publication:

Symposium Papers

Volume:

164

Abstract:

To assist bridge engineers in the State of Florida in selecting expansion joint systems, the Florida Department of Transportation/Structural Research Center (FDOT/SRC) concluded a two year bridge expansion joint evaluation program. This program consists of three components: I) Performance Evaluation, 2) Load Test Evaluation, and 3) Installation & Maintenance Evaluation. The test elements include seals. compression seal joints, strip seal joints, and buried joint systems. Twelve (12) joint suppliers volunteered to participate in the program. A total of seventeen (17) joints (or seals) were installed in eight (8) bridges on I-95 in Saint Lucie County, District IV. All bridges in the test program have prestressed concrete AASHTO girders and concrete deck slabs. All the bridges had armored compression seals at the end bents. In general, the test joint systems or seals were installed at the end bent joints (replacing the original material). The original design joint opening at 70 "F was one inch (1") for the end bent joints. Using criteria recommended by FDOT engineers and the Structures Design Guidelines, the SRC evaluated the test expansion joint sealants or systems. This paper presents the results of the test program. Also, it provides guidance concerning the selection of expansion joint systems for both new and existing bridges.

DOI:

10.14359/14316


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