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

Pazdera, Lubos; Čajka, Radim; Topolář, Libor; Matečková, Pavlína; Bílek, Vlastimil; Sucharda, Oldřích

doi:10.3311/ppci.12695

Cited by 18 publications

(13 citation statements)

References 22 publications

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“…Compared with polypropylene fiber, steel fiber has higher tensile strength and elastic modulus. Adding steel fibers to concrete can improve the compressive strength and toughness of concrete [ 1 , 2 , 3 , 4 ]. With the addition of a 1.5% volume fraction of steel fiber in concrete, steel fiber-reinforced concrete has the greatest compressive and flexural strengths [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Aramid/Carbon Hybrid Fiber-Reinforced Concrete

Wang

Syu

et al. 2021

Materials

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In this study, aramid fiber (Kevlar® 29 fiber) and carbon fiber were added into concrete in a hybrid manner to enhance the static and impact mechanical properties. The coupling agent presence on the surface of carbon fibers was spotted in Scanning Electron Microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS) graphs. The carbon fiber with a coupling agent affected the mechanical strength of the reinforced concrete. At 1% fiber/cement weight percentage, the hybrid fiber-reinforced concrete (HFRC) prepared using Kevlar fiber and carbon fiber of 12 and 24 mm in length under different mix proportions was investigated to determine the maximum mechanical strengths. From the test results, the mechanical strength of the HFRC attained better performance than that of the concrete with only Kevlar or carbon fibers. Foremost, the mix proportion of Kevlar/carbon fiber (50–50%) significantly improved the compressive, flexural, and splitting tensile strengths. Under different impact energies, the impact resistance of the HFRC specimen was much higher than that of the benchmark specimen, and the damage of the HFRC specimens was examined with an optical microscope to identify slippage or rupture failure of the fiber in concrete.

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Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Aramid/Carbon Hybrid Fiber-Reinforced Concrete

Wang

Syu

et al. 2021

Materials

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“…Acoustic emission (AE) technology has been proved as an effective nondestructive testing method, which is of great help in detecting tiny deformation and damage inside materials and has been gradually applied to the researches including rock, structure, and concrete in recent years [ 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. The principle of AE is the transient elastic wave generated by the friction, cracking, deformation, and other activities inside the material; the elastic wave propagates to the sensors; and the signals are converted and then showed as AE parameters.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Basalt Fiber Crack Resistance of Asphalt Concrete Based on Acoustic Emission

Yang

et al. 2021

Materials

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In this study, the semicircle three-point bending tests of ordinary asphalt concrete and basalt fiber asphalt concrete were carried out and acoustic emission parameters were collected during the test. The differences of the characteristics of acoustic emission parameters between basalt fiber asphalt concrete and ordinary asphalt concrete were analyzed, and the damage stages were divided based on the variation of acoustic emission parameters; Rise Angle and Average Frequency were introduced to study the cracking mode and crack resistance mechanism of asphalt concrete with basalt fiber. The results show that the acoustic emission parameters can well represent the toughening and crack resistance effect of basalt fiber in asphalt concrete, and the damage stages can be divided into three stages: microcrack initiation stage, fracture stage, and residual stage. The duration of the fracture stage and the load resistance time of the specimen were greatly prolonged. The proportion of shear events in the whole failure process increased greatly after the basalt fibers were added, especially in the fracture stage, which reduced the tensile failure tendency of the specimens, and thus improved the bending and tensile performance of the specimens and played a toughening and crack resistance role in the fracture stage.

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“…In the solved area, slabs in interaction with the subsoil, extensive research is underway both in the field of concrete [12] and geotechnics -subsoil analysis [13][14][15]. In some cases, it is necessary to deal with the effects of undermining structures [16].…”

Section: Introductionmentioning

confidence: 99%

Experimental Tests of Fiber-Reinforced Concrete Slabs and Comparison of Deformations Using 3D Graphs

Čajka

Marcalíková

2021

Civil and Environmental Engineering

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The presented article deals with experimental testing of fiber-reinforced concrete slabs using a specialized testing device, the so-called Stand. The experimental testing involved a total of three slabs with different fiber dosing. Dosing was chosen of 25, 50, and 75 kg/m3. In the case of fiber dosing of 75 kg/m3, the concrete recipe was changed with regard of fiber dosing. The test equipment allows vertical loading of the elements and, together with the installed track sensors and computer technology, records the vertical deformations. The deformation of the slabs was evaluated using 2D deformation sections in the slabs of mounted sensors and using 3D deformation sections with the use of interpolation of intermediate values. The article is supplemented by a test evaluation of the mechanical properties. These were concrete compressive strength, modulus of elasticity, and tensile strength. The mechanical properties were also tested and evaluated for plain concrete (dosage 0 kg/m3). By evaluating the mechanical properties and deformations, it is possible to observe differences in the behavior of fiber-reinforced concrete elements for different degrees of fiber reinforcement. The article evaluates the positive effect of fibers on the load capacity and the deformations of slabs.

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

Cited by 18 publications

References 22 publications

Mechanical Properties of Aramid/Carbon Hybrid Fiber-Reinforced Concrete

Mechanical Properties of Aramid/Carbon Hybrid Fiber-Reinforced Concrete

Experimental Study on Basalt Fiber Crack Resistance of Asphalt Concrete Based on Acoustic Emission

Experimental Tests of Fiber-Reinforced Concrete Slabs and Comparison of Deformations Using 3D Graphs

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