The influence of specimen size on the dynamic properties of lightweight concrete determined by the resonance method

Kocáb, Dalibor; Žítt, Petr; Daněk, Petr; Canek, M.; Alexa, Martin; Hanus, Petr

doi:10.1088/1757-899x/583/1/012028

Cited by 4 publications

(4 citation statements)

References 9 publications

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“…Supplementary, a non-destructive test based on the resonance method was employed to monitor the development of the dynamic modulus of elasticity of investigated composites during ageing. For more details about the principle of measurement refer to [13].…”

Section: Fracture Testsmentioning

confidence: 99%

Mechanical fracture parameters of hemp fibre reinforced cement-based composites with recycled aggregate

Šimonová

Kucharczyková

Poletanovic

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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This paper aims to evaluate the effect of replacement of aggregate by recycled one on fracture response of selected composites. These are hemp fibre reinforced cement-based composites. Four different mixtures were prepared: in reference one, the only natural aggregate was used whereas in the other three mixtures, the natural aggregate was replaced by recycled one in the amount of 10, 25 and 50 %, respectively. All mixtures contained hemp fibres with a length of 10 mm in the dosage of 1 % by volume. In order to determine the selected mechanical fracture characteristics of the investigated composites, three-point bending fracture tests were carried out on prismatic specimens with nominal dimensions 40 × 40 × 160 mm3 provided with an initial notch. During the whole course of the testing, the loading process was governed by a constant displacement increment of 0.02 mm/min. The vertical displacement (midspan deflection) was measured using the inductive sensor mounted on a special measurement frame placed on the specimens. The fracture tests were terminated when the midspan deflection reached 0.5 mm. The mechanical fracture parameters were obtained through a direct evaluation of the fracture test data via the effective crack model and the work-of-fracture method. The paper shows that composites with a higher dosage of recycled aggregate (25 and 50 wt%) achieve similar values of mechanical fracture properties, so this replacement can be recommended.

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Section: Fracture Testsmentioning

confidence: 99%

Mechanical fracture parameters of hemp fibre reinforced cement-based composites with recycled aggregate

Šimonová

Kucharczyková

Poletanovic

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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“…The natural frequency of longitudinal and torsional vibrations was measured on the specimens with dimensions of 40 × 40 × 160 mm 3 using a Handyscope HS4 oscilloscope equipped with an acoustic sensor. For more details about the principle of measurement, refer to [26]. The absolute values of E rL and µ r were calculated in compliance with the ASTM C215-19 [27] as:…”

Section: Dynamic Modulus Of Elasticity and Rigidity And Dynamic Poisson's Ratiomentioning

confidence: 99%

Mechanical Fracture and Fatigue Characteristics of Fine-Grained Composite Based on Sodium Hydroxide-Activated Slag Cured under High Relative Humidity

et al. 2020

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A typical example of an alternative binder to commonly used Portland cement is alkali-activated binders that have high potential as a part of a toolkit for sustainable construction materials. One group of these materials is alkali-activated slag. There is a lack of information about its long-term properties. In addition, its mechanical properties are characterized most often in terms of compressive strength; however, it is not sensitive enough to sufficiently cover the changes in microstructure such as microcracking, and thus, it poses a potential risk for practical utilization. Consequently, the present study deals with the determination of long-term mechanical fracture and fatigue parameters of the fine-grained composites based on this interesting binder. The mechanical fracture parameters are primarily obtained through the direct evaluation of fracture test data via the effective crack model, the work-of-fracture method, the double-K fracture model, and complemented by parameter identification using the inverse analysis. The outcome of cyclic/fatigue fracture tests is represented by a Wöhler curve. The results presented in this article represent the complex information about material behavior and valuable input parameters for material models used for numerical simulations of crack propagation in this quasi-brittle material.

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“…The natural frequency of longitudinal vibrations was measured on the specimens with nominal dimensions of 100 × 100 × 400 mm using a Handyscope HS4 oscilloscope equipped with an acoustic emission sensor, see Figure 5 left. For more details about the principle of measurement refer to Kocáb et al 20 The absolute value of E DYN was calculated in compliance with the ČSN 731372 21 as:

E_{DYN} = 4 ∙ L^{2} ∙ f_{L}^{2} ∙ ρ .

where L is the length of the specimen, f L is the natural frequency of longitudinal vibrations, ρ is the bulk density of the tested material.…”

Section: Fracture Test Programmentioning

confidence: 99%

Section: Testing Of Mechanical Parametersmentioning

confidence: 99%

Comprehensive fracture tests of concrete for the determination of mechanical fracture parameters

Lehký

Kucharczyková

Šimonová

et al. 2020

Structural Concrete

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Advanced experimental evaluation of the mechanical fracture properties of quasi‐brittle materials is an important part of the design, assessment, and computational modeling of structures made of these materials. The aim is to determine parameters independent of the test configuration or the size of the test specimens. This paper presents the results of an extensive experimental program which is part of the development of a comprehensive multilevel approach for experimental–computational determination of the mechanical fracture parameters of concrete. Three‐point bending and wedge‐splitting tests were performed simultaneously using three different geometrically similar specimen sizes and two well‐separated depths of initial notches. Before the start of the main testing program, the pilot tests that were performed were aimed at the design of the most appropriate concrete mixture. Special attention was paid to the selection of a maximum aggregate grain size. In order to study the process of concrete aging and the development of its mechanical properties, the accompanying destructive and non‐destructive tests were carried out at different ages of hardening. Fracture parameters were evaluated using the effective crack‐length formulation and work‐of‐fracture method. Finally, the size‐independent specific fracture energy was back‐calculated from the measured specific fracture energy.

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The influence of specimen size on the dynamic properties of lightweight concrete determined by the resonance method

Cited by 4 publications

References 9 publications

Mechanical fracture parameters of hemp fibre reinforced cement-based composites with recycled aggregate

Mechanical fracture parameters of hemp fibre reinforced cement-based composites with recycled aggregate

Mechanical Fracture and Fatigue Characteristics of Fine-Grained Composite Based on Sodium Hydroxide-Activated Slag Cured under High Relative Humidity

Comprehensive fracture tests of concrete for the determination of mechanical fracture parameters

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