On-site strength assessment of limestone based concrete slabs by combining non-destructive techniques

Craeye, Bart; Laar, H. van de; Eijk, J. van der; Gijbels, Wilfried; Lauriks, Leen

doi:10.1016/j.jobe.2017.08.006

Cited by 20 publications

(5 citation statements)

References 14 publications

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“…Hence, it is recommended to treat the surface with an abrasive stone preceding the test to minimize these influences. Furthermore the type and the hardness of the aggregate (rebound number is false if used over an exposed aggregate) and the carbonation degree, as it increases the surface hardness of the concrete, will have a big influence on the rebound readings [1].…”

Section: Rebound Hammermentioning

confidence: 99%

“…Ultrasonic pulse velocity testing (UPV) is applied by measuring the propagation speed of ultrasound waves through the material. It can be used for the appraisal of uniformity, the location of defects or cavities, for the determination of the depth of fractures and for the assessment of the elastic modulus and therefore of the compressive strength of the concrete [1]. The path of the ultrasonic pulse depends on the position of the wave emitter and the signal receiver: these can be placed in a direct, semi-direct or indirect position.…”

Section: Ultrasonic Pulse Velocitymentioning

confidence: 99%

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In-depth defect inspection of precast double walls using non-destructive techniques

Craeye

Vos

2023

MATEC Web Conf.

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Precast double walls are frequently used for building applications and consist of a pair of precast reinforced concrete shells connected by a lattice girder creating an inner cavity. Once placed at its final position this cavity is filled with freshly cast and compacted concrete. Aside from benefits such as increased ease in installation, reduced cost and shorter construction time also some pitfalls are recognized. Due to the restrained space and the presence of the truss girder undesired defects (e.g. voids, honeycombing, etc.) might occur without being noticed, as the outer wall elements also act as formwork. This actually might reduce the load capacity and jeopardize the structural integrity of the concrete structure. Therefore, different non-destructive tests are being used in order to assess the filling degree of the cavity in the double walls and to localize defects, with varying success ratio (i.e. the detectability). Different techniques were applied on a test wall with intentionally embedded defects (polystyrene blocks) with varying diameter: rebound hammer, ultrasonic pulse velocity via direct transmission, ultrasonic shear-wave tomography, ground penetrating radar and active infrared thermography. The success and the limits of these techniques for in depth defect localization are being discussed in this paper. The effect of the selected detection method and the surface-on-depth ratio of the defect itself has an effect on its detectability.

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Section: Rebound Hammermentioning

confidence: 99%

Section: Ultrasonic Pulse Velocitymentioning

confidence: 99%

In-depth defect inspection of precast double walls using non-destructive techniques

Craeye

Vos

2023

MATEC Web Conf.

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“…The study was initiated in 2013, with the casting of 14 non-reinforced slabs using 7 concrete mixtures with strength classes varying from C12/15 up to C50/60. For each mix two slabs (600 x 100 x 100 mm³) were cast and tested (destructive compressive strength and various non-or semi-destructive techniques, as mentioned in (Craeye et al, 2017)). The properties of these mixtures are given in Table 1.…”

Section: Concrete Compositionmentioning

confidence: 99%

Comparative Study on (Non-)Destructive Techniques for On-Site Strength and Durability Assessment of Limestone Based Concrete Slabs

Craeye¹,

Keijzerswaard²,

Maeijer³

2020

XV International Conference on Durability of Building Materials and Components. eBook of Proceedings

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For rehabilitation of existing concrete structures, strength and durability related properties of the reinforced element are of high importance. Assessment of these properties of existing structures can be performed by (i) destructive testing of drilled cores and testing the extracted samples in lab environment and (ii) indirect methods by using non-or semi-destructive techniques on site. The use of core-drilling is a time-consuming and labour-intensive method that weakens the existing concrete structure, leaving a lasting impression on it. As an alternative, many different non and semi-destructive techniques are available for the in-situ determination of compressive strength and durability related properties. An experimental program is conducted on concrete slabs of different strength classes intended for various exposure classes (according to EN206), based on a limestone aggregate matrix, which is typically used for Belgian applications. The plates have an age of approximately 5 years, which were also characterized at younger stage (in 2014). Besides destructive core drilling and testing (compressive strength tests, chloride migration testing, and determination of carbonation rate), several non-destructive techniques were selected for this study: the rebound hammer, the ultrasonic pulse velocity tester, the Wenner probe for concrete resistivity and the air permeability tester. Best fit correlations between the output of these different techniques were established. The effect of age (e.g. carbonation) on the established predictive models is being evaluated.

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“…A Schmidt hammer, also known as rebound hammer is a device used to estimate the in-situ concrete strength in relation to surface hardness. Schmidt hammer is the most commonly used NDT technique to estimate concrete strength and its uniformity within a structure owing to its ease of use and low cost [8]. The Schmidt hammer basically measures the surface hardness from the rebound of a plunger that strikes the concrete surface ( Fig.…”

Section: Schmidt Hammermentioning

confidence: 99%

Estimation of In-situ concrete strength using drilling resistance

2019

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Rapid and reliable condition assessment of reinforced concrete structures in high seismicity regions is a priority task in estimating their seismic safety. Non-destructive testing (NDT) methods may contribute to the condition assessment practice by providing fast and reliable strength estimation while causing minimal or no damage to the structure. Drilling resistance is an NDT method that has been used for mechanical characterization of natural stone and wood by measuring the force response for constant penetration rate and rotational speed. This paper focuses on the relationship between drilling resistance and compressive strength of concrete, including when it is combined with other NDT methods. Concrete cube samples produced using 6 different concrete mixtures were tested. Correlation equations were then obtained using statistical analysis. The results reveal that it may be possible to reliably estimate the compressive strength of concrete using drilling resistance method.

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On-site strength assessment of limestone based concrete slabs by combining non-destructive techniques

Cited by 20 publications

References 14 publications

In-depth defect inspection of precast double walls using non-destructive techniques

In-depth defect inspection of precast double walls using non-destructive techniques

Comparative Study on (Non-)Destructive Techniques for On-Site Strength and Durability Assessment of Limestone Based Concrete Slabs

Estimation of In-situ concrete strength using drilling resistance

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