2013
DOI: 10.4028/www.scientific.net/kem.592-593.545
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Monitoring of the Damage in Stone Blocks by Means of Non-Destructive Methods

Abstract: This paper deals with the damage assessment in stone blocks dismantled from a historic bridge construction. Nonlinear ultrasonic spectroscopy and impact echo methods were used for evaluating the stone block integrity structure. Harmonic analysis of the sample response on well defined ultrasonic excitation was used in the case of nonlinear ultrasonic method application. The amplitude dependent spectral changes of the probing signals were measured in the damaged blocks. Measurement results showed that the analys… Show more

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Cited by 5 publications
(5 citation statements)
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“…It should also be noted that increased fineness of grinding results in greater consistency of product structure and fewer adverse effects associated with any impurities of raw materials [19]. In this way, NDT techniques are intended for the identification of fabricated defects and not for the quality assessment of the material [20]. However, as will be pointed out below, real defects created during the fabrication process can also be identified, such as some cracks resulting from mix shrinkage.…”
Section: Description Of the Sample Testedmentioning
confidence: 99%
“…It should also be noted that increased fineness of grinding results in greater consistency of product structure and fewer adverse effects associated with any impurities of raw materials [19]. In this way, NDT techniques are intended for the identification of fabricated defects and not for the quality assessment of the material [20]. However, as will be pointed out below, real defects created during the fabrication process can also be identified, such as some cracks resulting from mix shrinkage.…”
Section: Description Of the Sample Testedmentioning
confidence: 99%
“…The method overcomes many of the barriers associated with flaw detection in concrete based on ultrasonic methods. Its principle is based on that the mechanical characteristics of a specimen affect its spectral properties [1][2][3].…”
Section: Introductionmentioning
confidence: 99%
“…The success of the technique relies on description changes in the frequencies in the spectra between the reference element and the element containing defects. The signal is digitized by means of a data processing system to be transferred into a computer memory [1,4,5].…”
Section: Introductionmentioning
confidence: 99%
“…The hydration rate is also influenced by the crystal size, type and amount of ions in the crystal structure, the crystal defect type and concentration and, finally, the clinker phase composition (for example, the hydration rate of belite is higher if alite is present in the process). [6][7][8][9] The hydration rate itself is a time-dependent process. In addition to the chemical and mineralogical composition, it also results from the cement grinding fineness, the water-cement ratio, the admixtures and additives and the ambient conditions (temperature and degree of wetness).…”
Section: Introductionmentioning
confidence: 99%