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Showing 1-5 of 7 Abstracts search results

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: 

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: 

SP181-02

Date: 

March 1, 1999

Author(s):

E. Owusu-Antwi and M. Darter

Publication:

Symposium Papers

Volume:

181

Abstract:

Concrete pavement design is still largely empirical, although, there are instances where analytical methods based on theoretical principals have been used. This paper presents the results of work to formulate the concepts for the development of a unified pavement analysis and design system for the improved performance of airport concrete pavements. The improved analysis and design system takes into account realistic material behavior over service life; environmental efffects; realistic pavement loading and a realistic assessment of pavement damage in the anlysis and design prcess, to come up with better performing pavements. Theses concepts are to form the basis of a pavement analysis and design system to be developed in subsequent applied research. A central component of the system proposed is a 3-dimensional finite element analysis based primary response model, applicable to the nonlinear analysis of concrete pavements. This primary response model incorporates the appropriate material constituitive models that will permit a realistic representation of the behavior of hte current and future materials used in concrete pavements. Using this primary response model, a data base of the outputs of nodal displacements, stresses, strains and local damage measures can be generated for a given pavement structure, for the applicable traffic and environmental loading conditions. The data generated is then used in a damage assessment procedure the results of which are used to predict the development of the key distress types and roughness for concrete pavements. This provides for greater design reliability and cost-effective pavement design. A major advantage of the mechanistic design procedure envisaged is its applicability to realistic rehabilitation design, which is likely to become very important in the coming decades, during which the demand for rehabilitation design is expected to supersede that for new construction design. The unified pavement analysis and design concept provides an effective system for the evaluation of the performance of existing concrete pavements from nondestructive testing results. This includes the evaluation of the in-situ material properties of existing pavements from the results of such nondestructive testing, using backcalculation procedures.

DOI:

10.14359/5513

Document: 

SP181-06

Date: 

March 1, 1999

Author(s):

S. Grater, F. McCullough, and D. Zollinger

Publication:

Symposium Papers

Volume:

181

Abstract:

More and more today’s engineers are finding a growing need to develop and implement construction specifications that are characteristic of the distress mechanisms apparent in the performance of pavements. Such specifications will inherently motivate and empower contractors to seek for improved methods to narrow the deviation of quality and enhance the potential to construct longer lasting pavements at a lower cost.

DOI:

10.14359/5517

Document: 

SP181-01

Date: 

March 1, 1999

Author(s):

J. Silfwerbrand

Publication:

Symposium Papers

Volume:

181

Abstract:

Thermal stresses in concrete pavements might be calculated according to a procedure developed by professor J. Eisenmann. The thermal stresses are dependent on the subgrade stiffness. Soft subgrades result in lower stresses. The Eisenmann procedure has been developed to cover square shaped slabs. This procedure is presented and discussed. in this paper. Two calculation examples are also presented

DOI:

10.14359/5512

12

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