Evaluating concrete surfaces using an image analysis process

Lemaire, Guillaume; Escadeillas, Gilles; Ringot, Erick

doi:10.1016/j.conbuildmat.2005.01.025

Cited by 59 publications

(36 citation statements)

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“…The first step of the method is to identify the size of each pore and the second is to add up its surfaces. To do so, in general, five groups of pores are formed according to diameter (2,4,6,8, and 10 mm). To include the pores in one of the groups, it must be possible to inscribe it in the circumference of diameter of each group chosen and not belong to a smaller group (Figure 2).…”

Section: Qsi Methodsmentioning

confidence: 99%

“…Mention must be made the QSI [3] method proposes a simplified method to quantify the surface occupied by the pores in relation with the total surface inspected, analyzing groups of pores by their diameter. The three main advantages of the QSI method, with respect to other methods of the literature [4,8,15], is its simplicity in determining and quantifying the surface quality of concrete; it does not require high knowledge in digital processing, can be applied on curved surfaces, and even with different shades or surface spots. The QSI method can simplify quality control of surface finish in architectural concrete.…”

Section: Introductionmentioning

confidence: 99%

“…This method eliminates the subjectivity of the results [4], but introduces variables that must be analyzed correctly to obtain results that correspond to the reality. These variables can vary for each concrete element (luminosity, roughness, geometry, etc.).…”

Section: Introductionmentioning

confidence: 99%

“…The digital processing of images [4,10,15] allows the zones with surface defects to be delimited and quantified according to premises of quality introduced into the control software. This method eliminates the subjectivity of the results [4], but introduces variables that must be analyzed correctly to obtain results that correspond to the reality.…”

Section: Introductionmentioning

confidence: 99%

“…There are several investigations [1][2][3][4][5][6][7][8][9][10], that developed methods of visual inspection and non-destructive tests. None of them, except the QSI method [3], is a simple method to be used in the work by a non-specialist operator.…”

Section: Introductionmentioning

confidence: 99%

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QSI Methods for Determining the Quality of the Surface Finish of Concrete

et al. 2018

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Abstract:The surface finish of a concrete element may become an index of its quality, relating the external and internal porosity with the mechanical and durability properties. Few methods are used to determine the surface quality of concrete elements. Mention must be made the Quality Surface Index (QSI) proposes a simplified method to quantify the surface occupied by the pores in relation with the total surface inspected, analyzing groups of pores by their diameter. The method of the CIB W29 (Commission W29 "Concrete Surface Finishings") proposes an inspection of the concrete element and its visual comparison with some standard templates. Finally, the digital processing of images allows the zones with surface defects to be delimited and quantified according to premises of quality introduced into the control software. These three methods are employed in this work and are applied in three concrete walls situated three meters from the observer (M-1, M-2 and M-3). Following the conversion of the results of the method with ImageJ and QSI, the results suppose differences that go from 0.1 tenths (2%) for M-3 up to 0.3 tenths (8%) for M-1. All values are within the obtained range with CIB W29 templates. This can validate the QSI and digital processing methods and allows a quick verification of the results. With the digital method, it is obtained that 23.5% of the total pores of M-1 have a diameter of less than 10 mm 2 and 44% of less than 100 mm 2 . For M-2 and M-3 the proportions of pores with a dimension below 10 mm 2 is of 43.1% and 27.7%, respectively, and that 77.5% and 60.7% are smaller than 100 mm 2 . From all the above it can be highlighted that M-1 is the one with the lowest amount of pores, however the proportion of the largest is greater than for M-2 and M-3. In the case of M-3, although it has a lower proportion of larger pores than M-1, its greater amount means it is the worst in terms of surface finish of the three.

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Section: Qsi Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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QSI Methods for Determining the Quality of the Surface Finish of Concrete

et al. 2018

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A Bughole Detection Approach for Fair-Faced Concrete Based on Improved YOLOv5

Li,

Di,

et al. 2023

Communications in Computer and Information Science

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Synthesis and characterization of release agent from used cooking oil at the concrete/formwork interface

Libessart

Anceur

Djelal

et al. 2023

Int. J. Environ. Sci. Technol.

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For this preliminary study, the lubricating properties of six formulations containing used cooking oils were tested. The physicochemical properties involved were determined by measuring viscosities at temperatures between 0° and 40°C as well as by calculating adhesion energies. The formwork/concrete interface was then studied on the steel surface by means of both tribological measurements and analysis of facing quality at 1 day and 7 days after stripping. The results obtained were compared with a marketed vegetable-based oil. The physicochemical results revealed attractive parameters despite a viscosity that remained high. The liquid/vapor surface tensions and wettabilities measured satisfied the recommendations, i.e. greater than 30 mN/m and less than 30°. The selected formulation offered the best compromise between composition and the physicochemical recommendations. At the formwork/concrete interface and for a scraped application, satisfactory criteria were derived, with a 35% reduction in friction and an acceptable facing quality for this initial study.

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Evaluating concrete surfaces using an image analysis process

Cited by 59 publications

References 0 publications

QSI Methods for Determining the Quality of the Surface Finish of Concrete

QSI Methods for Determining the Quality of the Surface Finish of Concrete

A Bughole Detection Approach for Fair-Faced Concrete Based on Improved YOLOv5

Synthesis and characterization of release agent from used cooking oil at the concrete/formwork interface

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