Materials selection for concrete overlays : the final report Page: 1
xviii, 192 p. : col. ill. ; 28 cm.View a full description of this report.
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Chapter 1. Introduction
1.1 Research Background
The infrastructure of the state of Texas is in poor condition, and in the 2011 Texas
Infrastructure Report Card Update, the state's roads and bridges were give a grade of D.
However, increases in the expected capacity of the state roads will put an enormous demand on
the transportation infrastructure. Thus, it is important that roadway constructed repairs are done
quickly so that traffic congestion in minimized. Portland cement concrete overlays (herein
referred to as concrete overlays) constructed on top of existing concrete pavement or asphalt
concrete pavement are cost-effective rehabilitation strategies. Concrete overlays are simply an
additional layer of concrete placed on top of existing pavements to increase the load bearing and
serviceability capacity. When properly constructed, overlays provide an optimum utilization of
the qualities of the existing pavement, by increasing the structural capacity, improving the
durability, and providing increased serviceability.
1.2 Research Objectives
The goal of this research was to investigate and recommend materials for concrete
overlays and to provide construction guidelines that can produce a good performing concrete
overlay. In order to achieve this goal, the following objectives were set:
* Conduct a comprehensive literature review to capture the existing knowledge on
concrete overlay usage, materials selection, and performance.
* Perform condition surveys on existing concrete overlays in Texas to gather
information regarding durability and conditions surveys and identify the role of
material constituents, bonding agents, mixture design, and concrete placement
factors that have major influence on the performance of concrete overlays.
* Select candidate materials for our laboratory study, based on our literature review
and condition surveys.
* Develop a laboratory process to evaluate overlay mixture proportioning.
* Evaluate data with a performance prediction model.
* Develop guidelines for materials selection.
* Develop guidelines for construction procedures.
1.3 Scope of Study
Based on the literature review and the condition surveys and recommendations from
TxDOT personnel, candidate materials were selected and mixture designs were developed.
Mixture designs included statistically based variations in varying the cement content, fly ash
content, and aggregate ratios. In addition, the effect of different types of fibers was also
examined. Tests performed were compressive strength, flexural strength, modulus of elasticity,
coefficient of thermal expansion, drying shrinkage, average residual strength for fiber in concrete,
and bond strength.
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Kim, Dong H.; Fowler, David W.; Ferron, Raissa P.; Trevino, Manuel M. & Whitney, David P. Materials selection for concrete overlays : the final report, report, July 2012; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth303706/m1/21/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.