Ageing and Deterioration of Materials in the Environment – Application of Multivariate Data Analysis

Smidt, E.; Schwanninger, Manfred; Tintner, Johannes; Böhm, Katharina

doi:10.5772/53984

Cited by 9 publications

(6 citation statements)

References 89 publications

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“…Santos et al [24] used PCA algorithm for early damage detection. Applications of PCA for separation of decayed samples by various fungi or at different degradation stages were also presented by several authors [25,[29][30][31]. …”

Section: Principal Components Analysismentioning

confidence: 99%

Multivariate analysis of multi-sensor data for assessment of timber structures: Principles and applications

Sandak

2015

Construction and Building Materials

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Section: Principal Components Analysismentioning

confidence: 99%

Multivariate analysis of multi-sensor data for assessment of timber structures: Principles and applications

Sandak

2015

Construction and Building Materials

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“…Acetyl groups can be seen as one of the weakest parts of the molecules. For wood, the deterioration of this molecular group during aging has been observed a number of times [8,11,13,21,22]. Methylene groups (band maxima 2920 and 2850 cm −1 ) play only a subordinate role in the molecular changes over time.…”

Section: Molecular Changes Over Timementioning

confidence: 99%

“…Therefore, even huge sample sets can be assessed with a considerable number of replicates covering material heterogeneity. This is a standard method for investigations of aging processes of organic matter in the environment [13].…”

Section: Introductionmentioning

confidence: 99%

Straw in Clay Bricks and Plasters—Can We Use Its Molecular Decay for Dating Purposes?

et al. 2020

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Dating of clay bricks (adobe) and plasters is a relevant topic not only for building historians in the Pannonian region. Especially in vernacular architecture in this region, clay with straw amendments is a dominant construction material. The paper presents the potential of the molecular decay of these amendments to establish prediction tools for age based on infrared spectroscopic measurements. Preliminary results revealed spectral differences between the different plant parts, especially culms, nodes, and ear spindles. Based on these results, a first prediction model is presented including 14 historic samples. The coefficient of determination for the validation reached 62.2%, the (RMSE) root mean squared error amounted to 93 years. Taking the limited sample amount and the high material heterogeneity into account, this result can be seen as a promising output. Accordingly, sample size should be increased to a minimum of 100 objects and separate models for the different plant parts should be established.

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“…Such distinctions may be caused by fundamental differences in the chemical compositions of wood. However, aging can also mean the formation of new substances and stabilization, which can, in some cases, be a desirable effect [ 4 ]. The critical wavelengths to break the most important chemical bonds in wood polymers are 346, 334, and 289 nm.…”

Section: Introductionmentioning

confidence: 99%

Aging of Wood for Musical Instruments: Analysis of Changes in Color, Surface Morphology, Chemical, and Physical-Acoustical Properties during UV and Thermal Exposure

et al. 2023

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The acoustic features of old resonance wood in violins exhibit a superior quality when compared to those from new resonance wood. This study focuses on an assessment of the sound quality of two types of wood for musical instruments, spruce and maple (class A and D), before and after aging via thermal and UV exposure. The samples were characterized before and after UV aging in terms of color change (using a Chroma meter), surface morphology (using a MarSurf XT20 instrument), chemical changes (monitored by FTIR spectroscopy), and sound propagation speed (using an ultrasound device). After UV treatment, the wavier surface increased the area of exposure and degradation. Also, the color changes were found to be more accentuated in the case of spruce compared to sycamore maple. The FTIR results indicated more advanced aging processes for spruce when compared to maple under the same experimental conditions. This difference resulted mostly from the increased formation of carbonyl-containing chromophores via oxidative processes in spruce rather than in maple, which is in agreement with the color change findings. Exposure of both species to thermal and UV radiation led to an increase in sound propagation speed, both longitudinally and radially, and to a greater extent in wood quality class A when compared to quality class D.

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Ageing and Deterioration of Materials in the Environment – Application of Multivariate Data Analysis

Cited by 9 publications

References 89 publications

Multivariate analysis of multi-sensor data for assessment of timber structures: Principles and applications

Multivariate analysis of multi-sensor data for assessment of timber structures: Principles and applications

Straw in Clay Bricks and Plasters—Can We Use Its Molecular Decay for Dating Purposes?

Aging of Wood for Musical Instruments: Analysis of Changes in Color, Surface Morphology, Chemical, and Physical-Acoustical Properties during UV and Thermal Exposure

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