In-Situ Strength Assessment of Concrete: Detailed Guidelines

Breysse, Denys; Balayssac, Jean-Paul; Alwash, Maitham; Biondi, S; Chiauzzi, Leonardo; Corbett, David; Garnier, Vincent; Gonçalves, Arlindo; Grantham, Michael; Güneş, Oğuz; Kenaï, Saïd; Luprano, V.A.M.; Masi, Angelo; Moczko, Andrzej; Qasrawi, Hicham Yousef; Romão, Xavier; Sbartaï, Zoubir Mehdi; Monteiro, André Valente; Vasanelli, Emilia

doi:10.1007/978-3-030-64900-5_1

Cited by 3 publications

(1 citation statement)

References 14 publications

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“…The review offactors affecting the reliability of assessing the concrete strength by rebound hammer and cores [94] outlined the following sources of uncertainty: measurement uncertainties [95], strength variability [96], model uncertainties [96], statistical uncertainties of sampling [97], and influence of uncontrolled factors such as concrete degree of saturation and carbonation [91,98,99], The standard EN 12504-2:2021 [100] specifies the method for determining the rebound index, whereas EN 12504-4:2021 [101] specifies the method for determining the ultrasonic pulse velocity, and EN 13791:2019 [99] summarizes guidance for the assessment of the in situ concrete compressive strength in structures. RILEM TC249-ISC also provides recommendations on non destructive in situ strength assessment of concrete [102,103], It is generally stated that the rebound hardness tests of concrete are not intended as an alternative to the compressive strength testing, but with suitable correlation, they can provide an estimate of the in situ strength, which may be sufficient for the purpose of selective demolition. Nevertheless, in the case of selective demolition, non destructive strength measurements can be verified, i.e., calibrated with results obtained on a discrete number of samples (cores) taken from the structure and tested in the laboratory, which is a common practice.…”

Section: Compressive Strength Of Concretementioning

confidence: 99%

Pre-demolition concrete waste stream identification: Classification framework

Nedeljković¹,

Tošić²,

Schlangen³

et al. 2023

Građ materijali i konstrukcije

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Demand for high quality recycled concrete aggregates (RCA) to offset the use of primary materials is significantly rising due to circular economy goals and high-value reuse of concrete. The quality of RCA significantly affects their availability for new concrete production due to the variability of parent concrete streams. The optimization of recycling procedures is under development to improve the quality of RCA, however, the costs and energy efficiency of such processes are of practical concern. With this in mind, this paper presents a new framework for reducing the variability of RCA quality by identifying concrete members before their demolition. The goal of identifying demolished concrete members from a structure is to provide groups of concrete members with similar mechanical and chemical properties through a systematic classification of the structural members. The quality assessment of concrete structures and their mechanical and chemical (composition, contamination) properties prior to demolition is generally recognized as challenging due to the absence of guidelines and the lack of easy-to-use in situ characterization techniques. This paper proposes experimental approaches that can non-destructively determine the properties of concrete structures, with a major emphasis on the measurement of the chemical composition of concrete before demolition. Characteristic quality indicators to classify concrete members are first proposed and can be instrumental in setting up future studies. A new method is proposed for in situ chemical composition testing of existing concrete structures; assuming that no records about the parent concrete are available. Next, the challenging parameters for in situ, non-destructive measurements are outlined. The practical application of the proposed method and its uptake in industry can potentially unlock a huge potential for optimized material recovery and contribute greatly to a fully circular construction industry.

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Section: Compressive Strength Of Concretementioning

confidence: 99%

Pre-demolition concrete waste stream identification: Classification framework

Nedeljković¹,

Tošić²,

Schlangen³

et al. 2023

Građ materijali i konstrukcije

View full text Add to dashboard Cite

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Critical evaluation of NDT for rapid condition assessment of existing RC buildings: A case study

et al. 2022

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There is an urgent need for rapid and reliable condition assessment of existing reinforced concrete (RC) buildings as a basis for structural safety evaluation, especially in developing countries in seismic regions such as Turkey. Traditionally, RC structures are evaluated by taking core samples from a limited number of structural elements for concrete strength and performing spot checks for the steel reinforcement by removing the concrete cover. In-situ concrete strength is determined through compression testing of core samples. Through spot checks, conformance of the existing reinforcement with the structural drawings is evaluated and a reinforcement realization factor is calculated for use in the analyses. Even though these conventional methods are relatively more accurate and reliable for condition assessment of existing RC structures, they are destructive, involved, time taking, slow and expensive. Non-destructive testing (NDT) methods are proposed as a solution to this problem. Using NDT methods in conjunction with a relatively small number of core tests potentially allows for more rapid yet still reliable condition assessment of existing structures. In this paper, a critical evaluation of rapid and reliable condition assessment methods is made through investigations on an 18-story residential RC building as a case study. Investigation results show that using NDT helps achieve time and cost savings while allowing for reliable condition assessment of existing buildings, and promises further savings through continued research and development in this area.

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Modeling Tensile Strength of Concrete Using Support Vector Regression

Guzmán-Torres¹,

Domínguez-Mota²,

Alonso-Guzmán³

et al. 2022

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In-Situ Strength Assessment of Concrete: Detailed Guidelines

Cited by 3 publications

References 14 publications

Pre-demolition concrete waste stream identification: Classification framework

Pre-demolition concrete waste stream identification: Classification framework

Critical evaluation of NDT for rapid condition assessment of existing RC buildings: A case study

Modeling Tensile Strength of Concrete Using Support Vector Regression

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