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Papers by Corrado Cremonini

Proceedings of the 2022 IMEKO TC4 International Conference on Metrology for Archaeology and Cultural Heritage

In the frame of an experimental study focused on structural reinforcement of wood by consolidatio... more In the frame of an experimental study focused on structural reinforcement of wood by consolidation, developed during two master's theses in Conservation and Restoration of Cultural Heritage (Turin Universiy in collaboration with Centro Conservazione e Restauro La Venaria Reale), the potentials and limits of possible investigation techniques to verify the performances of the treatments, both superficially (optical and electron microscopy) and in terms of penetration (microtomography) were evaluated. This paper discusses the main preliminary results, with particular attention to the micro-CT measurements, carried out for detecting the penetration of consolidating materials into the wood. The results appear particularly encouraging in terms of potentialities of the diagnostic technique, taking also into consideration its non-invasiveness and, in perspective, of possible applications to real case studies, boosted in the case of addition of nanocomposites (metal particles) to traditional materials for consolidation.

For sound control in closed spaces, perforated wood-based panels are widely used as walls and cei... more For sound control in closed spaces, perforated wood-based panels are widely used as walls and ceilings covering for their sound absorption properties in the low frequency range. Despite the high interest in this products, accurate estimation models of their properties are still unavailable. This paper reports the sound absorption properties determined for drilled okoumé plywood intended for interiors covering. The drilling percentage was fixed at 1.5, while different cavity sizes were arranged behind the specimens to evaluate their influence on the sound absorption. Tests were performed by means of the impedance tube method. The experimental data obtained can be used for the development of new estimation models with increased accuracy.

Wood-based lightweight composites are widely used and appreciated in marine craft, being suitable... more Wood-based lightweight composites are widely used and appreciated in marine craft, being suitable for meeting the requirements of such a high-challenging application, due to their high strength to density ratio. While marine plywood represents a consolidated product for skins formation, the research is today focused on new high-performing composites with special cores. In this context, the paper reports the development and testing of an innovative wood-based composite. This is in the form of a sandwich panel made of okoume (Aucoumea klaineana Pierre) plywood skins bonded to an innovative honeycomb core constituted by lozenge-shaped, okoume plywood cells. A physical-mechanical characterization was performed, aimed to obtain an overview of the performances achieved by the panel; moreover, a preliminary investigation of the sound absorption properties was carried out. On the whole the results promote further developments, in particular regarding the optimization of the sound absorption properties in the low frequency range.

Holzforschung, Jul 31, 2019

Poplar cultivation is enduring a long-lasting crisis in Italy, but it is still playing a relevant... more Poplar cultivation is enduring a long-lasting crisis in Italy, but it is still playing a relevant role in the Italian and European wood sectors. To improve its prospects, the manufacturers of poplar plywood have recently activated various strategies to make it a distinguished panel with specific performances. In this frame, thermo-treatment could open new applications and markets. The present study investigates the physico-mechanical properties of thermo-treated poplar plywood. For this purpose, panels were manufactured with urea-melamine-formaldehyde adhesive, both in a standard mixture and added with resorcinol. They were then treated by the Termovuoto®process at 170, 190 and 210°C for 2 h. Changes in density, bonding quality, bending strength, modulus of elasticity, color and durability related to the aforementioned temperatures were investigated. Overall, the bonding quality of treated panels complied with the requirements of EN 314-1 and 2; bending strength and modulus of elasticity decreased, color darkened and durability increased. The latter is particularly important, because poplar wood is not durable and this process makes it suitable for use in humid conditions, offering new prospects for poplar plywood applications.

European Journal of Wood and Wood Products, 2011

In this work the effectiveness of potassium sorbate and condensed tannins against mycelial growth... more In this work the effectiveness of potassium sorbate and condensed tannins against mycelial growth and sporulation of some widespread moulds of High-Density Fibreboards (HDF) for crate production was tested. Laboratory inoculation tests were performed on 130 treated and untreated samples of HDF using the European Standard EN 15457. Potassium sorbate was more effective than condensed tannins and significantly reduced (P<0.05) both mycelial growth and mitospore (conidia) production of mould fungi compared to controls.

Proceedings of the 2022 IMEKO TC4 International Conference on Metrology for Archaeology and Cultural Heritage

In the frame of an experimental study focused on structural reinforcement of wood by consolidatio... more In the frame of an experimental study focused on structural reinforcement of wood by consolidation, developed during two master's theses in Conservation and Restoration of Cultural Heritage (Turin Universiy in collaboration with Centro Conservazione e Restauro La Venaria Reale), the potentials and limits of possible investigation techniques to verify the performances of the treatments, both superficially (optical and electron microscopy) and in terms of penetration (microtomography) were evaluated. This paper discusses the main preliminary results, with particular attention to the micro-CT measurements, carried out for detecting the penetration of consolidating materials into the wood. The results appear particularly encouraging in terms of potentialities of the diagnostic technique, taking also into consideration its non-invasiveness and, in perspective, of possible applications to real case studies, boosted in the case of addition of nanocomposites (metal particles) to traditional materials for consolidation.

For sound control in closed spaces, perforated wood-based panels are widely used as walls and cei... more For sound control in closed spaces, perforated wood-based panels are widely used as walls and ceilings covering for their sound absorption properties in the low frequency range. Despite the high interest in this products, accurate estimation models of their properties are still unavailable. This paper reports the sound absorption properties determined for drilled okoumé plywood intended for interiors covering. The drilling percentage was fixed at 1.5, while different cavity sizes were arranged behind the specimens to evaluate their influence on the sound absorption. Tests were performed by means of the impedance tube method. The experimental data obtained can be used for the development of new estimation models with increased accuracy.

Wood-based lightweight composites are widely used and appreciated in marine craft, being suitable... more Wood-based lightweight composites are widely used and appreciated in marine craft, being suitable for meeting the requirements of such a high-challenging application, due to their high strength to density ratio. While marine plywood represents a consolidated product for skins formation, the research is today focused on new high-performing composites with special cores. In this context, the paper reports the development and testing of an innovative wood-based composite. This is in the form of a sandwich panel made of okoume (Aucoumea klaineana Pierre) plywood skins bonded to an innovative honeycomb core constituted by lozenge-shaped, okoume plywood cells. A physical-mechanical characterization was performed, aimed to obtain an overview of the performances achieved by the panel; moreover, a preliminary investigation of the sound absorption properties was carried out. On the whole the results promote further developments, in particular regarding the optimization of the sound absorption properties in the low frequency range.

Holzforschung, Jul 31, 2019

Poplar cultivation is enduring a long-lasting crisis in Italy, but it is still playing a relevant... more Poplar cultivation is enduring a long-lasting crisis in Italy, but it is still playing a relevant role in the Italian and European wood sectors. To improve its prospects, the manufacturers of poplar plywood have recently activated various strategies to make it a distinguished panel with specific performances. In this frame, thermo-treatment could open new applications and markets. The present study investigates the physico-mechanical properties of thermo-treated poplar plywood. For this purpose, panels were manufactured with urea-melamine-formaldehyde adhesive, both in a standard mixture and added with resorcinol. They were then treated by the Termovuoto®process at 170, 190 and 210°C for 2 h. Changes in density, bonding quality, bending strength, modulus of elasticity, color and durability related to the aforementioned temperatures were investigated. Overall, the bonding quality of treated panels complied with the requirements of EN 314-1 and 2; bending strength and modulus of elasticity decreased, color darkened and durability increased. The latter is particularly important, because poplar wood is not durable and this process makes it suitable for use in humid conditions, offering new prospects for poplar plywood applications.

European Journal of Wood and Wood Products, 2011

In this work the effectiveness of potassium sorbate and condensed tannins against mycelial growth... more In this work the effectiveness of potassium sorbate and condensed tannins against mycelial growth and sporulation of some widespread moulds of High-Density Fibreboards (HDF) for crate production was tested. Laboratory inoculation tests were performed on 130 treated and untreated samples of HDF using the European Standard EN 15457. Potassium sorbate was more effective than condensed tannins and significantly reduced (P<0.05) both mycelial growth and mitospore (conidia) production of mould fungi compared to controls.