Acoustic Emission and Modal Frequency Variation in Concrete Specimens under Four-Point Bending

Lacidogna, Giuseppe; Piana, Gianfranco; Carpinteri, Alberto

doi:10.3390/app7040339

Cited by 42 publications

(24 citation statements)

References 48 publications

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“…At a curing age of 90 days, the four-point flexural beam test was conducted, since it is considered the best test to replicate the long-term performance of the cement-treated layers under traffic loads [18,36,39,57,58].…”

Section: Methodsmentioning

confidence: 99%

Flexural Strength Prediction Models for Soil–Cement from Unconfined Compressive Strength at Seven Days

et al. 2019

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Soil–cement is an environmentally friendly road construction technique for base and subbase materials, which allows employing soils placed in the right-of-way of the road or in the surroundings, by improving its engineering properties. With this technique, it is possible to reduce the over-exploitation of quarries, the necessity of landfills and the pollutant gas emission due to the reduction of aggregate fabrication and transport. The manufacturing of soil–cement is generally controlled by means of the Uniaxial Compressive Strength (UCS) test at seven days, according to the regulations of each country. Nonetheless, one of the properties that best defines the performance of soil–cement is the Flexural Strength (FS) at long term, usually at 90 days. The aim of this paper is to develop new equations to correlate the UCS and the FS at long term and the UCS at seven days and at 90 days. Obtained results validate the proposed models and, hence, the flexural strength can be predicted from the Uniaxial Compressive Strength at seven days, allowing, if necessary, correcting measures (recalculation or rejection) in early stages of the curing time to be taken.

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Section: Methodsmentioning

confidence: 99%

Flexural Strength Prediction Models for Soil–Cement from Unconfined Compressive Strength at Seven Days

et al. 2019

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“…As an example, time reverse modeling using the AE test is applied in RC specimens and confirmed to be capable of localizing AE activity caused by concrete cracking [23]. In addition, the combination of AE signals and digital imaging can reveal and possibly characterize damage in concrete [24]. (b) Size of specimens-Reinforced beam specimens of three sizes of scales are made to investigate the size effect of concrete beams when the bending test is introduced using digital image correlation (DIC) and AE.…”

Section: Factors Affecting Acoustic Emission Testsmentioning

confidence: 99%

Monitoring Damage Using Acoustic Emission Source Location and Computational Geometry in Reinforced Concrete Beams

2018

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Non-destructive testing in reinforced concrete (RC) for damage detection is still limited to date. In monitoring the damage in RC, 18 beam specimens with varying water cement ratios and reinforcements were casted and tested using a four-point bending test. Repeated step loads were designed and at each step load acoustic emission (AE) signals were recorded and processed to obtain the acoustic emission source location (AESL). Computational geometry using a convex hull algorithm was used to determine the maximum volume formed by the AESL inside the concrete beam in relation to the load applied. The convex hull volume (CHV) showed good relation to the damage encountered until 60% of the ultimate load at the midspan was reached, where compression in the concrete occurred. The changes in CHV from 20 to 40% and 20 to 60% load were five and 13 times from CHV of 20% load for all beams, respectively. This indicated that the analysis in three dimensions using CHV was sensitive to damage. In addition, a high water-cement ratio exhibited higher CHV formation compared to a lower water-cement ratio due to its ductility where the movement of AESL becomes wider.

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“…However, the use of acoustic emission [11][12][13] presents itself as a method fit to gain a deeper understanding and achieve better identification of material disruption as it was used for concrete in selected cases [14] and [15]. The utilization of AE can also be important as a control element for the optimization of technologies [16].…”

Section: Introductionmentioning

confidence: 99%

Measurement and Utilization of Acoustic Emission for the Analysis and Monitoring of Concrete Slabs on the Subsoil

Pazdera

Čajka

Topolář

et al. 2019

Period. Polytech. Civil Eng.

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The article deals with the field of use of acoustic emission (AE) measurement in engineering structures. The research particularly focuses on the assessment of acoustic emission during an experimental test of the load-carrying capacity of concrete slabs on the ground. A wider field of research includes structural and material optimization of advanced engineering structures. The tests of concrete slabs are then carried out in an alternate solution which differs in the used concrete or steel fibre reinforced concrete (FRC). The experimental program then includes typical measurement methods using displacement sensors and strain gauges. Non-destructive methods of measurement including acoustic emission have been used with an eye to the configuration of the experiment and deeper understanding of the actual behaviour and damage to the structure allowing for subsequent optimization and non-linear simulation of slab computation. The aim of the submitted article is to present and assess the acoustic emission as a non-destructive method which can be used to detect damage and determine the load-bearing capacity of the selected type of a FRC structure.

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Acoustic Emission and Modal Frequency Variation in Concrete Specimens under Four-Point Bending

Cited by 42 publications

References 48 publications

Flexural Strength Prediction Models for Soil–Cement from Unconfined Compressive Strength at Seven Days

Flexural Strength Prediction Models for Soil–Cement from Unconfined Compressive Strength at Seven Days

Monitoring Damage Using Acoustic Emission Source Location and Computational Geometry in Reinforced Concrete Beams

Measurement and Utilization of Acoustic Emission for the Analysis and Monitoring of Concrete Slabs on the Subsoil

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