Verification of the ability of selected acoustic methods to detect the amount of steel fibers in concrete

Plšková, Iveta; Topolář, Libor; Komárková, Tereza; Matysík, Michal; Chobola, Z.; Stonis, Patrik

doi:10.1201/9780429021596-34

Cited by 2 publications

(1 citation statement)

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“…The time of passage through the acoustic connecting material and the probe is called dead time. Dead time is determined using the standard with a known time of passage [24,25]. The standard had the value of 13.6 µs in our case.…”

Section: Testing Methodsmentioning

confidence: 99%

Comparison of Testing Methods for Evaluating the Resistance of Alkali-Activated Blast Furnace Slag Systems to Sulfur Dioxide

et al. 2022

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Alkali-activated systems (AAS) represent an ecologically and economically sustainable inorganic binder as an alternative to ordinary Portland cement (OPC). One of the main benefits of AAS is their durability in aggressive environments, which can be equal or even better than that of OPC. In this paper, the influence of the type of alkaline activator in alkali-activated blast furnace slag (AAS) in terms of resistance to sulfur dioxide corrosion was investigated. The durability testing process was based on the CSN EN ISO 3231 standard and simultaneously compared with mortar samples prepared by using Blastfurnace cement CEM III/A 32.5R. The degradation progress was evaluated by employing several different methods such as observing the compressive strength development, weight change evaluation, non-destructive testing methods like ultrasound or impact echo technique, or visual phenolphthalein technique. Subsequently, fundamental characterization of samples by the XRD method was performed during the degradation test. The obtained results indicate that none of the testing methods used could be prioritized over others to determine the resistance of AAS against the action of sulfur dioxide. For this reason, the durability testing of AAS remains an issue, and the development of specific standards considering the behavior of AAS seems necessary.

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Section: Testing Methodsmentioning

confidence: 99%

Comparison of Testing Methods for Evaluating the Resistance of Alkali-Activated Blast Furnace Slag Systems to Sulfur Dioxide

et al. 2022

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Influence of alkali-activated materials placement during curing on their dynamic parameters

et al. 2020

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The production of Portland cement has a considerable environmental impact. Its replacement with alkali-activated binders can contribute to reducing the environmental burden of building production. The paper presents partial results from our experimental research carried out on test specimens made of alkali-activated slag mortar (activated by sodium carbonate). The specimens of dimensions 40×40×160 mm differed in the manner of placement after 28 days of curing in water. The samples were tested by non-destructive methods at different ages. We observed the effect of sample storage on ultrasonic pulse velocity, dominant frequency shifts and dynamic modulus of elasticity as well as changes of these parameters over time.

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Verification of the ability of selected acoustic methods to detect the amount of steel fibers in concrete

Cited by 2 publications

References 1 publication

Comparison of Testing Methods for Evaluating the Resistance of Alkali-Activated Blast Furnace Slag Systems to Sulfur Dioxide

Comparison of Testing Methods for Evaluating the Resistance of Alkali-Activated Blast Furnace Slag Systems to Sulfur Dioxide

Influence of alkali-activated materials placement during curing on their dynamic parameters

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