Assessment of fire-damaged concrete using crack density measurements

Short, N. R.; Purkiss, J. A.; Guise, S. E.

doi:10.1680/stco.3.3.137.38957

Cited by 4 publications

(5 citation statements)

References 6 publications

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“…1). The results concerning some well-established techniques (Schmidt's rebound hammer and Ultrasonic Pulse Velocity, UPV) showed a remarkable dispersion, [7,12]. This evidence is probably ascribable to a number of differences in the operational parameters (specimens' size, experimental procedure, material porosity and initial moisture content), bringing to light the need for standardised calibration procedures.…”

Section: Uniformly Damaged Concrete Cubes For Calibration Testsmentioning

confidence: 99%

“…The possible approaches to this problem (Table 1) involve either the inspection of the average response of the concrete cover [4,5], a point-by-point analysis of small samples taken at different depths [6][7][8] or some special techniques for the interpretation of the overall response of the concrete member [8][9][10]. However, the majority of these methods are usually not very practical for in situ applications, being either fast but sketchy (e.g.…”

Section: Introductionmentioning

confidence: 99%

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New NDT techniques for the assessment of fire-damaged concrete structures

Colombo

Felicetti

2007

Fire Safety Journal

109

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Section: Uniformly Damaged Concrete Cubes For Calibration Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New NDT techniques for the assessment of fire-damaged concrete structures

Colombo

Felicetti

2007

Fire Safety Journal

109

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“…A similar conclusion could be inferred if crack density is employed instead of crack length. Crack density is defined by the ratio between the crack length and the surface area of the respective slab (Short et al , 2002; Litorowicz, 2006; Torrijos et al , 2010). Since both slabs had similar surface area, the shape of the curves obtained (shown in Figure 8(b)) is similar to those, respectively, obtained in Figure 8(a).…”

Section: Resultsmentioning

confidence: 99%

Damage assessment of reinforced concrete flat slabs through modal tests using impact excitation

Ferreira

Guedes

Melo

et al. 2019

IJSI

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Purpose In reinforced concrete (RC) structures, an evidence of damage is the presence of cracking. In order to evaluate the effect of damage on cracking pattern and natural frequency in RC slabs, two of such structures with different dimensions and reinforcement ratios were tested, in which cracks were induced through application of static load, followed by modal tests using impact excitation. The paper aims to discuss this issue. Design/methodology/approach The gradient of the fundamental natural frequency along the decay, the crack opening rate and also a global damage index based on changes of the fundamental natural frequency were evaluated. Findings The behaviour of the aforementioned gradient was distinct for both slabs, increasing monotonically with the cracking level for the slab with lowest reinforcement ratio, and increasing until 33 per cent of the collapse load and then decreasing afterwards for the slab with the highest ratio. Changes of the gradient were consistent with changes of the crack opening rate. Both results of gradient changes and cracking pattern brought evidence that the balance between open (old) and breathing (new) cracks differed between the slabs, and may be responsible for such differences. Originality/value Damage assessment in RC structures using vibration tests is mostly concentrated on beams. In this work, an advance is made by investigating slabs. The lack of a unique pattern of changes of the gradient implies that its absolute value is not generally suitable for the association with the damage level. However, the impact tests can be effectively used to detect early damage on slabs using this proposed parameter.

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“…52,53 An additional way to use core samples in the post-fire assessment is to conduct a petrographic analysis of them. As most of the fire-induced damage is cracks at a microscopic level, microscopy can be used to examine in detail all the damage that occurred due to the fire, 54 but also parameters, such as crack density, 55,56 can be measured to obtain the width of the damaged zone. A commonly used technique is measuring the color change.…”

Section: Destructive Techniques-core Samplesmentioning

confidence: 99%

State‐of‐the‐art review on the post‐fire assessment of concrete structures

Jovanović

Caspeele

Lombaert

et al. 2023

Structural Concrete

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Fires are rare events, but in the case of their occurrence, they can have a significant effect on the structure. Concrete is a durable noncombustible material but can be damaged by fire. This damage does not often lead to structural collapse, but can significantly hinder the structure's future performance. A thorough post‐fire assessment of concrete structures is essential to determine the condition of the structure and select the best course of action to take. This paper reviews the current state of knowledge on the post‐fire assessment of concrete structures. The techniques that are commonly used are presented and discussed, highlighting their advantages and disadvantages. Furthermore, based on the literature case studies, an overview of different approaches and techniques is presented. Finally, the framework and goals of the post‐fire assessment are investigated. The paper concludes with a summary of the current state of knowledge and a list of key research needs.

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Assessment of fire-damaged concrete using crack density measurements

Cited by 4 publications

References 6 publications

New NDT techniques for the assessment of fire-damaged concrete structures

New NDT techniques for the assessment of fire-damaged concrete structures

Damage assessment of reinforced concrete flat slabs through modal tests using impact excitation

State‐of‐the‐art review on the post‐fire assessment of concrete structures

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