Experimental Study of Strengthening an RC Bridge Deck by Adding a Concrete Overlay

Theiner, Y.; Hart, H. L.; Drexel, Martin; Hofstetter, Günter

doi:10.1111/str.12044

Cited by 7 publications

(6 citation statements)

References 15 publications

(30 reference statements)

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“…These recommendations focus on limiting moisture losses in properly designed concrete mixes. The most accepted way to do it is to cure concrete carefully, especially in structures with high surface‐to‐volume ratio, rather than using methods, which only prevent moisture loss, as protecting from wind or sunshine by plastic sheeting, monomolecular films, windbreaks and/or shades . Also, revibration and refinishing of the fresh concrete tends to close early shrinkage cracking, because of the destruction of the growing tensile stress and the fill of cavities under horizontal reinforcing bars.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Techniques to Mitigate Early Shrinkage Cracking through an Image Analysis Methodology

Ruiz-Ripoll

Barragán

Moro³

et al. 2016

Strain

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Nowadays, new products are introduced in concrete mixes to reduce the effects of shrinkage, which are the main reason of most of early age cracking phenomena, especially when curing is not performed in accordance to best practices. The lack of a standardized methodology to quantify concrete cracking complicates the determination of the effectiveness of different solutions and comparison between them. This research presents an evaluation through images of the suitability of fibres and shrinkage‐reducing admixtures to control early shrinkage cracking in slab‐type concrete elements. The use of this technique has permitted quantifying the typical cracking parameters objectively and analyse probabilistically the average crack width. Results show a delay and reduction of cracking after adding shrinkage‐reducing admixtures and fibres in concrete, especially 1 kg m−3 of polymeric microfibres. The incorporation of these components directly into the mix modified the behaviour of concrete, reducing shrinkage cracking from the beginning of moisture losses.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the Techniques to Mitigate Early Shrinkage Cracking through an Image Analysis Methodology

Ruiz-Ripoll

Barragán

Moro³

et al. 2016

Strain

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“…As is well known and has been confirmed by the experimental investigations, [56,57,66] due to the low permeability of concrete, moisture migration in the specimen and moisture transfer to the environment are extremely slow processes. For instance, according to Bažant [70] moisture equilibrium in a specimen of 25 mm of thickness will be reached after about 2 years of drying from 100% ambient relative humidity to 50%.…”

Section: Tests On Unsealed Loaded Specimensmentioning

confidence: 55%

“…The measuring accuracy of the MRS is about 0.30%. In addition, measurements of mass water contents by MRSs were conducted by the authors and described in previous papers, [56,57] dealing with the evaluation of the effects of drying shrinkage on the behaviour of concrete structures strengthened by overlays, where more details concerning nondestructive measurements with MRSs are provided.…”

Section: Measurement Of Mass Water Contentsmentioning

confidence: 99%

Comprehensive study of concrete creep, shrinkage, and water content evolution under sealed and drying conditions

Theiner

Drexel

Neuner

et al. 2017

Strain

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A comprehensive study of the time-dependent behaviour of concrete, enhanced by measuring the evolution of the respective mass water content, is presented. Compressive creep as well as shrinkage are investigated on sealed and unsealed specimens in terms of the concrete age at loading of 2, 7, and 28 days, respectively, at a loading level of 30% of the compressive strength at loading. In addition, on the basis of the collected measurement data, the impact of load application on the moisture content is studied and the Pickett effect is re-examined. The obtained set of material data consists of basic and drying creep strains for different concrete ages at loading, autogenous shrinkage strains as well as combined autogenous and drying shrinkage strains, the evolution of the mass water content, the water desorption isotherm, and the time-dependent evolution of Young's modulus and the compressive strength. It provides a consistent set of material data for a particular concrete grade and will be available for calibrating and validating concrete models. KEYWORDS basic and drying creep, concrete, mass water content, Pickett effect, shrinkage

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“…The composition of the investigated concrete mixture is given in Table 1 . It has been used for the strengthening of an existing reinforced concrete bridge deck by adding a concrete overlay [ 46 ].…”

Section: Methodsmentioning

confidence: 99%

Investigation of Tensile Creep of a Normal Strength Overlay Concrete

2018

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The present contribution deals with the experimental investigation of the time-dependent behavior of a typical overlay concrete subjected to tensile stresses. The latter develop in concrete overlays, which are placed on existing concrete structures as a strengthening measure, due to the shrinkage of the young overlay concrete, which is restrained by the substrate concrete. Since the tensile stresses are reduced by creep, creep in tension is investigated on sealed and unsealed specimens, loaded at different concrete ages. The creep tests as well as the companion shrinkage tests are performed in a climatic chamber at constant temperature and constant relative humidity. Since shrinkage depends on the change of moisture content, the evolution of the mass water content is determined at the center of each specimen by means of an electrolytic resistivity-based system. Together with the experimental results for compressive creep from a previous study, a consistent set of time-dependent material data, determined for the same composition of the concrete mixture and on identical specimens, is now available. It consists of the hygral and mechanical properties, creep and shrinkage strains for both sealed and drying conditions, the respective compliance functions, and the mass water contents in sealed and unsealed, loaded and load-free specimens.

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Experimental Study of Strengthening an RC Bridge Deck by Adding a Concrete Overlay

Cited by 7 publications

References 15 publications

Evaluation of the Techniques to Mitigate Early Shrinkage Cracking through an Image Analysis Methodology

Evaluation of the Techniques to Mitigate Early Shrinkage Cracking through an Image Analysis Methodology

Comprehensive study of concrete creep, shrinkage, and water content evolution under sealed and drying conditions

Investigation of Tensile Creep of a Normal Strength Overlay Concrete

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