Visual inspection and non-destructive tests-based rating method for concrete bridges

Pushpakumara, B. H. J.; Silva, Sudhira De; Silva, G.H.M.J. Subashi De

doi:10.1504/ijstructe.2017.081672

Cited by 23 publications

(9 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%

“…A profile of the typology of surface pores detected in M-1 is represented according to the filter used. With the 1 mm 2 (1 × 1) filter, 312 pores were obtained with a total surface affected of 3285 mm 2 ; however, with the filter of 400 mm 2 (20 × 20) only one pore is obtained of 664 mm 2 . This profile can determine the suitability of each filter depending on the demands of the investigation and the inspection distance (Figure 8).…”

Section: Surface Finish Determination With Digital Methodsmentioning

confidence: 99%

“…This enabled the comparison of results among the three methods used, and the goodness of the methodologies used in this work to be checked. In the case of the digital analysis of images, the results of the 5 × 5 filter were shown (the surface pores smaller than 25 mm 2 were not taken into account in the analysis). With the CIB templates, M-1 and M-2 obtained a value between 3 and 4, and M-3 between 4 and 5.…”

Section: Comparison Of Three Methodsmentioning

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: Surface Finish Determination With Digital Methodsmentioning

confidence: 99%

Section: Comparison Of Three Methodsmentioning

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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“…In few countries, existing bridge condition assessment procedures include NDT surveys, but their periodical execution is still rare. NDTs results are generally used to assess in a more reliable way the most suitable condition state of a deteriorated component (Pushpakumara et al, 2017). In this regard, Gucunski et al (2012), evidenced how NDTs can be used for a proper segmentation of a bridge structure in subparts characterized by similar condition states, with the final aim of helping inspectors to make a more objective rating.…”

Section: Non-destructive Techniquesmentioning

confidence: 99%

State-Of-Research on Performance Indicators for Bridge Quality Control and Management

Zanini

Faleschini

Casas

2019

Front. Built Environ.

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The present study provides a review of the most diffused technical and non-technical performance indicators adopted worldwide by infrastructure owners. This work, developed within the European COST Action TU 1406-"Quality specifications for roadway bridges, standardization at a European level," aims to summarize the state-of-art maintenance scheduling practices adopted by bridge owners, mainly focusing on the identification and classification of the most diffused performance indicators (PIs). PIs are subdivided in technical and non-technical ones: for this latter subclass, PIs are classified in environmental, social and economic-targeted. The study aims to be a reference for researchers dealing with performance-based assessments and bridge maintenance and management practices.

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