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| Author | : Shiraz D. Tayabji |
| Publisher | : |
| Total Pages | : 124 |
| Release | : 1986 |
| Genre | : Pavements |
| ISBN | : |
Field load testing was conducted by CTL at five sites in Iowa during April 1986. This report presents the results of field testing, analysis of results, and recommendations to incorporate study results in Iowa's design procedure for bonded concrete overlays.
| Author | : Gordon Daring |
| Publisher | : |
| Total Pages | : |
| Release | : 1983 |
| Genre | : Pavements, Concrete |
| ISBN | : |
| Author | : Lucas Agustin Lahitou |
| Publisher | : |
| Total Pages | : 53 |
| Release | : 2009 |
| Genre | : Pavements |
| ISBN | : |
| Author | : Hamdi Celik Ozyildirim |
| Publisher | : |
| Total Pages | : 24 |
| Release | : 1993 |
| Genre | : Concrete bridges |
| ISBN | : |
This study evaluated concretes containing silica fume for use in overlays as a suitable alternative to the widely used latex-modified concrete (LMC). A two-lane, four-span bridge deck was overlaid with concrete containing silica fume at 7 percent or 10 percent by mass of the Portland cement as an additional cementitious material. The results of laboratory tests on field concretes containing silica fume were satisfactory. Silica fume concrete (SFC) bonds well with the base concrete and has very low permeability, high strength, and satisfactory freeze-thaw resistance. In the field, over the 5-year evaluation period, cracking and increases in half-cell potentials and chloride content indicated a tendency to corrosion. However, such increases are also evidenced with LMC overlays. Thus, the results indicate that SFC can be effectively used in thin overlays as an alternative to LMC. SFC, as LMC, is prone to plastic shrinkage; therefore, immediate and proper curing must be provided to avoid the shrinkage cracking that can occur under adverse curing conditions.
| Author | : |
| Publisher | : |
| Total Pages | : 128 |
| Release | : 1989 |
| Genre | : Ground penetrating radar |
| ISBN | : |
The purpose of this project was to evaluate the location and quantities of debonding in selected portland cement concrete (PCC) overlays. The project entailed an infrared thermographic survey and a ground penetrating radar survey of the PCC overlays to locate areas of debonding between the overlays and the original pavement. An infrared scanner is capable of locating these areas because of the temperature differential which is established between bonded and debonded areas under certain environmental conditions. A conventional video inspection of the top surface of the pavement was also completed in conjunction with the infrared thermographic survey to record the visual condition of the pavement surface. The ground penetrating radar system is capable of locating areas of debonding by detecting return wave forms generated by changes in the dielectric properties at the PCC overlay original pavement interface. This report consists of two parts; a text and a set of plan sheets. The text summarizes the procedures, analyses and conclusions of the investigation. The plan sheets locate specific areas of debonding, as identified through field observations.
| Author | : Yu T. Chou |
| Publisher | : |
| Total Pages | : 38 |
| Release | : 1985 |
| Genre | : Concrete |
| ISBN | : |
The nature of the design equations for the nonbonded concrete overlays currently used by the US Army Corps of Engineers was examined and the original source of the equation was also examined. Using simple mechanics, new overlay equations were developed which are suitable for different thicknesses and elastic properties in the overlay and base concrete slabs. The difference in the computed overlay thickness between the new and existing equations is not large when the overlay thickness is equal to or greater than the base slab. The difference can become excessive when the overlay thickness is much less than that of the base slab. The new equations were compared with the finite element computer program for concrete overlays with various combinations of slab thickness, elastic property, and subgrade modulus. The comparisons were very favorable, indicating that the overlay equations developed in this report are analytically correct. The validity of the equations was also examined using the field full-scale accelerated traffic tests on concrete overlays. It was difficult to judge whether the new equations are superior to the existing equation. This conclusion was expected because for all the seven test sections analyzed, the overlay thicknesses were either equal to or greater than those of the base slabs.
