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Showing 1 to 20 of 25 for “"concrete overlays"”.
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Tensile relaxation of bonded concrete overlays
Restrained shrinkage in bonded concrete overlays can cause stress build up, cracking and even debonding. Tensile relaxation is the main mechanism of stress relief in concrete overlays. This results in less possibility of cracking and debonding. The research described in this study presents an …
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Evaluations of concrete overlays for bridge deck applications
Protective concrete deck overlays have been successfully used by WVDOH in a number of old and new concrete bridge decks to extend their service life, but in several cases delamination and failures have been observed. A comprehensive study has been recently defined to investigate overlays …
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Evaluation of bonded concrete overlays on asphalt pavements
A field performance study of 19 bonded concrete overlays on asphalt pavements (BCOA) projects in 9 states were completed in this research study. BCOA pavements ranged in age from 7 to 26-years old and average thickness per project of 3.8 to 9.3 inches. The panel size varied from 4 ft x 4ft to 12 ft …
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Long-term performance of bonded concrete overlays subjected to differential shrinkage
The performance of bonded concrete overlays relates mainly to the resistance against cracking and debonding. The associated failure mechanisms are largely a result of differential volume changes between substrate and overlay. The objective of this research was to develop analytical tools to …
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Early Age Behavior of Bonded Concrete Overlays Due to Shrinkage and Thermal Changes
… developed to predict cracking tendency in bonded concrete overlay at early age. The design guide, implemented as an EXCEL spreadsheet, is a practical tool for pavement engineers. The design guide calculates surface stresses and interfacial debonding stress due to shrinkage and thermal changes at …
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Interlayer stress absorbing composite (ISAC) for mitigating reflection cracking in asphalt concrete overlays
"This study deals with the design of a composite material which could effectively alleviate/mitigate the problem of reflection cracking in an AC overlay. After reviewing various case histories and having identified the problem areas in the treatments currently in use, a composite material …
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Evaluation of bonding between ultra-thin portland cement concrete overlays and asphalt cement concrete
… technique for deteriorated asphalt cement concrete (ACC) pavement. Numerous UTW projects have been constructed and tested, enabling researchers to identify key elements responsible for the successful performance of UTW. These key elements include foundation support, interface bonding …
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Three-Dimensional Finite Element Analysis to Evaluate Reflective Cracking Potential in Asphalt Concrete Overlays
The study revealed that the crack treatment interlayer, ISAC, greatly reduces the tensile stresses at the bottom of the overlay after both the cooling cycle and cooling cycle plus traffic loading. On the other hand, the modified asphalt (PG 64-28) greatly reduces the tensile stresses at the top of …
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The effect of aggregate on the age at cracking of bonded concrete overlays subjected to restrained deformation
… is increasing throughout the world as existing concrete structures continue to age. The bonded concrete overlay method, where a new repair material layer is cast over an existing damaged substrate, is the most commonly utilized method of repair. However, this repair technique is prone to failure …
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The Effect of Asphalt Concrete Overlays on The Progression of Durability Cracking in Portland Cement Concrete (d-Cracking, Frost, Freeze-Thaw, Autogenous Healing)
… the progressive deterioration of Portland cement concrete (PCC) and is normally caused by winter freeze-thaw cycling. The PCC coarse aggregate source has been identified as causing well designed mixes to develop D-cracking.
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The influence of fly ash and ground granulated blastfurnace slag on restrained shrinkage cracking of bonded overlays
The concrete repair industry is driven by deterioration of, damage to, and defects in concrete structures. The impact of deterioration or damage is a reduction in the service life of the concrete structure. One of the common methods used to repair and rehabilitate damaged concrete structures is the …
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Novel applications of pulse pre-pump Brillouin Optical Time Domain Analysis for behavior evaluation of structures under thermal and mechanical loading
… a measurement approach to monitor strains in concrete and detect damage (e.g. crack and delamination) in bonded and unbonded concrete overlays; (3) characterize the strain and temperature sensitivities of distributed fiber optic sensors at elevated temperatures; (4) develop a thermal annealing …
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Shrinkage of Latex-Modified and Microsilica Concrete Overlay Mixtures
… steel in the sound chloride-contaminated concrete that is left in-place. Bridge deck overlays in Virginia are usually either latex-modified concrete or microsilica concrete, and both types of overlay are considered equivalent in terms of performance. However, the latex-modified concrete …
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Evaluation of concrete bridge deck overlays
… bond strengths between them and substrate concrete. All the materials used are of interests to WVDOH. Both fresh and hardened concrete properties of seven different overlay types were characterized. Four of the seven were selected for the study of interface bond strength, which included …
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Improving the Sustainability of Performance-Based Concrete Overlay Mix Design made with Rounded Aggregate
… accelerate damage. Conventional prescriptive concrete overlay designs are often inflexible, limiting the use of new materials and failing to address region-specific performance needs. This research aims to develop performance-based concrete overlay mix designs using locally available rounded …
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Investigating repair mortars containing superabsorbent polymers as a method of internal curing to improve concrete patch repair performance
Concrete structures are designed with a specific service life in mind and deteriorate over time due to their exposure to environmental conditions. In order to increase the service life of concrete structures, they can sometimes be rehabilitated and repaired using concrete overlays. However, …
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Assessing the age at cracking of concrete repair mortars
The amount of concrete infrastructure needing repair and rehabilitation is increasing worldwide. The bonded overlay technique, which involves removal- of a damaged concrete layer on an existing concrete base (substrate) and replacing it with a new layer is one of the most widely used techniques. …
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Influence of substrate moisture preparation on concrete overlay bond strength
… the years in understanding the fundamentals of concrete composition and performance in both safe and harsh environments. Nevertheless, premature concrete deterioration remains a concern and is often experienced either due to poor workmanship or design. The bonded concrete overlay technique has …
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Predicting and testing the tensile relaxation of concrete
… is an important property in structural concrete members such as concrete overlays and patch repairs under sustained imposed restraint. Tensile relaxation helps in reducing tensile stresses in concrete which leads to mitigation of cracking in restrained concrete members. Normally, it is …
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Blast Retrofit of Unreinforced Masonry Walls Using Fabric Reinforced Cementitious Matrix (FRCM) Composites
… methods have been proposed, including the use of concrete overlays, polyurea coatings and advanced fiber-reinforced polymer (FRP) composites. Fabric-reinforced cementitious matrix (FRCM) is an emerging material which can also be used to strengthen and remove the deficiencies in unreinforced …
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