On the dispersion of data collected by in situ diagnostic of the existing concrete

Fiore, Andrea; Porco, Francesco; Uva, Giuseppina; Mezzina, Mauro

doi:10.1016/j.conbuildmat.2013.05.001

Cited by 53 publications

(27 citation statements)

References 8 publications

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“…As shown in previous studies [18][19], estimating the CoV fc |N using a small sample of results from concrete core tests may lead to estimates that do not reflect the real variability of the concrete strength. This fact is even more relevant due to the high value of the concrete strength CoV fc |N that is usually found in existing buildings [20][21][22][23], often exceeding a value of 0.20 [24].…”

Section: Comparison Between the Ec8/3 Cf Values And The Proposed Valuesmentioning

confidence: 99%

Material strength safety factors for the seismic safety assessment of existing RC buildings

Pereira

Romão

2016

Construction and Building Materials

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h i g h l i g h t sSafety factors are proposed to characterize material strength in existing buildings. The uncertainty due to the number of tests and strength variability are considered. The safety factors are compatible with EC8/3 seismic safety assessment methods. Safety factors and survey plans are defined for concrete compressive strength. Safety factors and survey plans are defined for reinforcing steel yield strength. a r t i c l e i n f o b s t r a c tNew material safety factors (CF mat ) are proposed to characterize material strength in existing buildings. These safety factors are developed in order to be compatible with seismic safety assessment procedures defined by current standards such as Eurocode 8 Part 3. The general theory behind the development of the CF mat safety factors considers the uncertainty associated to the number of surveyed structural elements and the inherent variability of the material strength under analysis. The CF mat safety factors are developed using a finite population approach where the material properties in a building are discretized by considering one value per element. The proposed theory is used to define specific CF mat values and survey plans for the concrete compressive strength and for the reinforcing steel yield strength.

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Section: Comparison Between the Ec8/3 Cf Values And The Proposed Valuesmentioning

confidence: 99%

Material strength safety factors for the seismic safety assessment of existing RC buildings

Pereira

Romão

2016

Construction and Building Materials

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“…According to some authors, see [42], a significant decrease in de-hydroxylation onset temperature of portlandite occurs in thermally-altered samples.…”

Section: Microstructural and Colorimetry Analysismentioning

confidence: 99%

“…One of the most interesting and effective non-destructive tests is called SonReb (SONic + REBound) and consists of the combined use of the sclerometer test and the ultrasonic one (see [42] and [37]). Indeed, this technique is capable of quite accurate assessment of concrete strength in a very short time.…”

Section: Non-destructive Testsmentioning

confidence: 99%

Integrated Approach for Post-fire Reinforced Concrete Structures Assessment

Stochino

Meloni

Carcangiu

2017

Period. Polytech. Civil Eng.

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“…Often, standards regulating the assessment of existing buildings require a limited number of tests/inspections to be performed at each storey and for each type of primary component that is part of the building in order to obtain estimates of the mean values of the material properties. Nonetheless, as referred in [14], current building codes do not address the uncertainty level in the survey results and neglect the impact that sampling may have on the estimate of the dispersion of concrete strength (specifically on the estimate of the CoV) and on the corresponding estimate of the mean value. Therefore, controlling the epistemic uncertainty about the CoV of the concrete strength is a key component of a survey framework since it will affect the variability of the estimate (i.e.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the concrete strength in existing buildings using a finite population approach

Pereira

Romão

2016

Construction and Building Materials

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h i g h l i g h t sA new method to assess concrete strength in existing building is presented. The method disaggregates the concrete variability into finite populations. The CoV of the concrete strength is evaluated using the CoV of rebound hammer tests. The method controls the uncertainty in the estimate of concrete strength variability. The method controls the uncertainty in the estimate of the mean concrete strength. a r t i c l e i n f o b s t r a c tA framework is defined to evaluate the concrete compressive strength in existing buildings and control the uncertainty associated to the survey planning and to the concrete strength randomness. The framework proposes the discretization and disaggregation of the concrete strength in a building into finite populations of elements. Finite population statistics are used to correlate the number of tests performed in each population with the uncertainty about the mean and the coefficient of variation (CoV) of the concrete strength. A method to estimate the CoV of the concrete strength using the CoV of rebound hammer test results is also proposed to overcome the need for a high number of destructive tests. Results show that the proposed approach effectively controls the uncertainty in the estimate of the variability of the concrete strength in a population as well as the uncertainty in the estimate of the mean value of the concrete strength.

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On the dispersion of data collected by in situ diagnostic of the existing concrete

Cited by 53 publications

References 8 publications

Material strength safety factors for the seismic safety assessment of existing RC buildings

Material strength safety factors for the seismic safety assessment of existing RC buildings

Integrated Approach for Post-fire Reinforced Concrete Structures Assessment

Assessment of the concrete strength in existing buildings using a finite population approach

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