Experimental fast-assessment of post-fire residual strength of reinforced concrete frame buildings based on non-destructive tests

Alcaíno, Pablo; Santa-María, Hernán; Magna-Verdugo, C.; López, Luis Fernando de Mingo

doi:10.1016/j.conbuildmat.2019.117371

Cited by 14 publications

(13 citation statements)

References 7 publications

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“…The visual inspection checks found the presence of efflorescence, permeable, and unsound concrete, cracks, and gradual disintegration of concrete, spalling of concrete and cracking, etc. The flow chart of the visual inspection is shown in Figure 2 [19][20][21][22][23][24][25]. Different types of distresses such as cracks, spalling, and corrosion in the building are shown in Figure 3.…”

Section: Visual Investigationmentioning

confidence: 99%

Structural Health Monitoring of Existing Reinforced Cement Concrete Buildings and Bridge Using Nondestructive Evaluation with Repair Methodology

Kumar¹,

Rattan²,

Kapoor³

et al. 2021

Advances and Technologies in Building Construction and Structural Analysis

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Sustainable development means the utilization of resources at a rate less than the rate at which they are renewing. In India infrastructure industry is growing rapidly due to globalization and raising awareness. In the present study, challenges faced by countries like India are to sustain the existing expectations with limited resources available. Reinforced Concrete (RC) structure may suffer several types of defects that may jeopardize their service life. This chapter deals with condition assessment and repair of RCC (G+3) building situated at Northern part of the country. There are various techniques available for repair and rehabilitation of reinforced concrete structures. From a maintenance point of view, it is essential to take up the strength assessment of an existing structure. So, to find out the reason behind the deterioration of the concrete structures some of the NDT and partially destructive technique are used. The NDT tests conducted during this study are Rebound Hammer, Ultra-sonic Pulse Velocity, Concrete resistivity Meter, Ferro-scanning and Carbonation, etc. This chapter helps to explains, how identified the different parameters of distress building like strength, density, level of corrosion and amount of reinforcement. On basis of these results, apply a repair methodology to revert back the strength parameters of the buildings.

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Section: Visual Investigationmentioning

confidence: 99%

Structural Health Monitoring of Existing Reinforced Cement Concrete Buildings and Bridge Using Nondestructive Evaluation with Repair Methodology

Kumar¹,

Rattan²,

Kapoor³

et al. 2021

Advances and Technologies in Building Construction and Structural Analysis

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show abstract

“…In recent times, studies [18][19][20] have reported the use of GEP for modelling complex relations between experimental data, and it was established that GEP was more efficient than the traditional regression and machine learning techniques. Numerous studies [8,9,13,21] have reported measures for the determination of residual strengths in fire-damaged structures, but not so much have been related to temperature in such buildings. However, in this study, we modelled the probable temperature that fire-damaged structures have been subjected in GEP, using laboratory simulated fire experiments and field forensic investigation of selected fire-damaged structures.…”

Section: Buffmentioning

confidence: 99%

“…Moreover, the coring of concrete requires a high level of safety precautions and expertise, as the tested concrete could be further weakened or lead to collapse. Various research efforts [5][6][7][8][9][10][11] have attempted to explore the residual strengths of fire-damaged concrete buildings and structural steel elements. The studies have utilised concrete coring and NDT methods, such as Schmidt rebound hammer and ultrasonic pulse velocity testers.…”

Section: Introductionmentioning

confidence: 99%

Modeling Temperature of Fire-Damaged Reinforced Concrete Buildings Based on Nondestructive Testing and Gene Algorithm Techniques

Awoyera

Olalusi

2021

Fire Technol

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It is a daunting task to ascertain the level of deterioration in structural concrete and embedded reinforcing steel after fire damage. Thus, this study focuses on modelling the temperature of fire-damaged reinforced concrete buildings based on nondestructive and Gene algorithm techniques. The study employed nondestructive data (rebound hammer number (RH) and ultrasonic pulse velocity (UPV)) from laboratory simulation tests on concrete elements and field forensic investigation of firedamaged buildings to develop mathematical models. Other data used for the model was the thickness of the member. The input parameters for the model were: RH, UPV, and breadth of the member, while the temperature was the output data. The study proposed a model based on genetic expression programming (GEP), with a correlation coefficient of 0.9895. The developed model generalised the data correctly with a high degree of accuracy; it would be a useful tool for the field assessment of fire-damaged reinforced concrete buildings.

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“…Even if the Fc remains the same or decreases, it does so solely to the degree that does not adversely affect the safety of concrete. However, at temperatures higher than 300 °C, the dehydration of Ca(OH) 2 occurs, and the C-S-H decomposition accelerates, which causes the strength to start decreasing, especially rapidly after the 400-500 °C range [9,10]. Therefore, via UPV analysis, research has been conducted to estimate the mechanical properties at high temperatures, depending on the materials mixed in cement, including aggregates and admixtures, and the mechanical properties.…”

Section: ) 1 Introductionmentioning

confidence: 99%

Analysis of Ultrasonic Pulse Velocity Correlations for Estimating Residual Compressive Strength of Concrete Subjected to High-Temperature Hysteresis: Influence of Various Aggregates

Kim

Jeong²,

Choi³

et al. 2022

Int J Fire Sci Eng

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In this study, the compressive strength and ultrasonic pulse velocity (UPV) behaviors of concrete at high temperatures by aggregate type were comparatively analyzed in accordance with the CEN and CEB Codes. The aggregates adopted were divided into limestone, granite, river gravel, and crushed stone, and the target temperatures were set to 100 °C, 200 °C, 300 °C, 400 °C, 500 °C, and 600 °C. The analysis items were specified as compressive strength (Fc), UPV, ratio of compressive strength (Fcratio), and UPV ratio (UPVratio); in addition, the correlations between Fcratio and UPV were analyzed and compared to the previously proposed estimation equations for concrete at room temperature. Accordingly, the Fcratio of limestone and river gravel aggregates exceeded the UPVratio at temperatures lower than 300-400 °C; however, UPVratio tended to be higher at subsequent temperatures. For granite aggregates, UPVratio was higher than Fcratio over the entire temperature range, while crushed stone aggregates exhibited higher Fcratio than UPVratio. Both Fcratio and UPVratio of granite aggregates exceeded those of limestone aggregates, while the UPVratio and Fcratio of river gravel aggregates were higher and lower than those of crushed stone aggregates, respectively. Consequently, a strength estimation equation was proposed by analyzing the correlations between Fcratio and UPV, and was inferred to be better than the existing strength estimation equations.

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Experimental fast-assessment of post-fire residual strength of reinforced concrete frame buildings based on non-destructive tests

Cited by 14 publications

References 7 publications

Structural Health Monitoring of Existing Reinforced Cement Concrete Buildings and Bridge Using Nondestructive Evaluation with Repair Methodology

Structural Health Monitoring of Existing Reinforced Cement Concrete Buildings and Bridge Using Nondestructive Evaluation with Repair Methodology

Modeling Temperature of Fire-Damaged Reinforced Concrete Buildings Based on Nondestructive Testing and Gene Algorithm Techniques

Analysis of Ultrasonic Pulse Velocity Correlations for Estimating Residual Compressive Strength of Concrete Subjected to High-Temperature Hysteresis: Influence of Various Aggregates

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