Investigating Performance of Bonded Concrete Overlays

Abstract

A bonded concrete overlay (BCO) is a concrete pavement rehabilitation method used to extend the life of an existing concrete pavement. The BCO should bond fully with the existing concrete, leading to a thicker composite pavement section, a much stiffer pavement, and a considerable decrease in pavement stresses. For one project, cost estimates for a BCO were half as much as for full-depth replacement of a pavement. In some cases BCOs have delaminated shortly after construction. This paper proposes a framework for identifying the causes of early age delamination in BCOs. The early age behavior of newly constructed BCOs is examined. The factors affecting the long-term performance of the BCO are the quality of the surface preparation, the materials used in the BCO, and the curing of the BCO. Weather monitoring during BCO construction is recommended. Methods of detecting and mapping delarninations are discussed. Several BCO delamination case studies are analyzed using this framework. The model is useful not only for investigating BCO performance but also for understanding and preparing BCO construction specifications.

Verification of the Influence of Particle Shape on the Chemical Resistance of Epoxy Coating and Use of Waste Glass as the Filler

“…Not only the principle of the coating's degradation but also the size, type and distribution of the filler particles in the epoxy binder were monitored. The need for adhesion monitoring exists in the case of large areas of chemically stressed objects such as industrial floors, bridge decks and injected concrete structures [41]. Based on the evaluation of coating adhesion on concrete substrates using a pull-off adhesion gauge (Table 5), it can be seen that the adhesion of coatings to concrete was higher than the tensile strength of the concrete.…”

Investigation of Sasw as Evaluation Technique to Evaluate Asphalt Pavement With Utw

“…An important paper on investigating bonded concrete overlay (BCO) debonding distress was published by Delatte et al 10 In this paper, a number of nondestructive testing (NDT) technologies including, SASW, impact-echo, impulse response, FWD and the rolling dynamic deflectometer (RDD) were investigated to determine debonding in a BCO field test strip. SASW and FWD are found most useful for estimating engineering properties of layered pavement systems.…”

Ultrasonic evaluation methods applicable to polymer concrete composites

“…In this case, quality control of the repair application is one of the most important purposes for applying NDT methods. These are mainly focused on nondestructive estimation of the system geometry (layer thickness), and detection of flaws, voids and places with lower adhesion [43][44][45][46] at the interface zone of the repair material (PC/PCC) and the concrete substrate. Lack of adhesion can be a result of technological error, actual material incompatibility in the PC-CC system, as well as from the change of properties during the service time of the repair, which are termed durability problems.…”