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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 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
SP181-06
S. Grater, F. McCullough, and D. Zollinger
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.
10.14359/5517
SP181-05
J. Soares, D. Zollinger, and T. Tang
The tensile strength used in the design of concrete structures, such as concrete pavement systems, has typically been determined based on small test specimens such as split tension cylinders and bending beams. It has been well known that strength values obtained from different specimens can be largely different. Naturally, one must question the applicability of strength values obtained from these conventional specimens to an actual structure. This deficiency is encompassed within effects of specimen (or structure) size and geometry on the strength. Given that fracture parameters can be used to determine the tensile strength of concrete structures, a simplified tension test method, based on the size effect law, is presented in this paper to determine fracture parameters. Cylindrical specimens are incorporated in the proposed method since such specimens have the advantage of being easily cast or cored. Special emphasis is given to concrete pavement systems where tensile strength is particularly important since most distresses in concrete pavements are due to tension-induced cracking.
10.14359/5516
SP181-04
A. Gurjar and T. Tang
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.
10.14359/5515
SP181-03
N. Buch
This paper presents preliminary results of a laboratory and a finite element investigation of the behavior of joints in jointed concrete pavement systems in terms of load transfer derived through aggregate interlock. The results have thus far revealed that aggregate type, texture and shape have a pronounced effect on the load transfer mechanism of an undoweled joint in a concrete pavement system. Pure aggregate interlock is not sufficient to provide adequate load transfer over a long period of time. The load transfer mechanism of an undoweled joint was modeled by a two-phase system (cement matrix and aggregates). This approach produced results that were confirmed by experimental results. The finite element analysis demonstrated that the load transfer mechanism is sensitive to slab thickness, modulus of subgrade support, and joint stiffness (aggregate interlock factor). This analysis also indicates that the shear capacity of a joint is a function of the aggregate interlock factor, subgrade modulus, magnitude of load, and crack width. The finite element modeling indicated that undoweled joints in thinner pavements resting on weak subgrades tend to develop high shear stresses (and load transfer efficiencies) and subsequently a lower Endurance Index.
10.14359/5514
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