Novel cold-cured epoxy-silica hybrids as potential adhesives for concrete/masonry rehabilitation: environmental aging (Articolo in rivista)

Type

• Prodotto della ricerca (Classe)
• Articolo in rivista (Classe)

Label

• Novel cold-cured epoxy-silica hybrids as potential adhesives for concrete/masonry rehabilitation: environmental aging (Articolo in rivista) (literal)

Anno

• 2010-01-01T00:00:00+01:00 (literal)

Alternative label

• Lettieri M; Frigione M; Prezzi L; Mascia L (2010)
  Novel cold-cured epoxy-silica hybrids as potential adhesives for concrete/masonry rehabilitation: environmental aging
  in Restoration of buildings and monuments (Internet); Aedificatio Publishers, Freiburg (Germania)
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• Lettieri M; Frigione M; Prezzi L; Mascia L (literal)

Pagina inizio

• 353 (literal)

Pagina fine

• 365 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

• 16 (literal)

Rivista

• Restoration of buildings and monuments (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

• 14 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

• 4-5 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• M. Lettieri: Institute for Archaeological and Monumental Heritage, C.N.R. - IBAM, Lecce, Italy; M. Frigione: Department of Engineering for Innovation, University of Salento, Lecce, Italy; L. Prezzi: SAFE Marine Nanotechnologies, Ferentino (FR), Italy; L. Mascia: Department of Materials, Loughborough University, U.K (literal)

Titolo

• Novel cold-cured epoxy-silica hybrids as potential adhesives for concrete/masonry rehabilitation: environmental aging (literal)

Abstract

• Der Einfluss des Alterns in natürlicher Umgebung und bei unterschiedlichem Feuchtigkeitsniveau wurde an Laborformulierungen von Epoxi-Silica Hybridwerkstoffen untersucht. Die Werkstoffe wurden speziell entworfen für das Aushärten bei Zimmertemperatur und die Anwendung beim Instandsetzen von Beton und Mauerwerk. Die Zugabe kleiner Mengen von Amoniummolybdat zum Aminohärter wurde an dicken Schichten (Dicke = 4.5 mm) untersucht. Diese Schichten konnten eine erhebliche Menge Äthanol zurück halten, der entweder ursprünglich zur Harzmischung zugefügt wurde oder aber durch Sol-Gel Hydrolyse oder Kondensationsreaktionen entstand. Die Änderungen, die während des Alterns stattfanden wurden über die Veränderung der Glasübergangstemperatur (Tg), die Wasserabsorption und die mechanischen Eigenschaften bestimmt. Es konnte beobachtet werden, dass während des Alterns in feuchter Umgebung in den Siloxanbereichen der Epoxi-Silika Hybridwerkstoffe zusätzliche Sol-Gel Reaktionen ablaufen, die dazu beitragen, dass die Glasübergangstemperatur und der Elastizitätsmodul sowie die Biegezugfestigkeit wesentlich ansteigen. Die beobachteten Effekte wurden noch verstärkt durch Zugabe von kleinen Mengen von Amoniummolybdat. Außerdem hat die Feuchtigkeit in der umgebenden Atmosphäre zum Austreiben des verbliebenen Ethanols aus den Proben beigetragen. (literal)
• The effects of environmental aging at various levels of humidity were studied on the experimental formulations of epoxy-silica hybrids, specifically designed for curing at ambient temperature to be employed as adhesives for concrete and/or masonry structures. The addition of small amounts of ammonium molybdate to the amine hardener was investigated using thick section specimens (4.5 mm thick) capable of retaining substantial amounts of ethanol either originally added to the resin mixture or subsequently formed by the sol-gel hydrolysis and condensation reactions. The changes taking place during aging were evaluated in terms of variations in glass transition temperature (Tg), water absorption and mechanical properties. It has been found that during environmental aging in moist atmosphere the siloxane domains of the epoxy-silica hybrids undergo additional sol-gel reactions, which bring about a further increase in Tg and substantial increases in Young's modulus (Eflex) and flexural strength (?max flex). The observed effects were found to be enhanced by the addition of small amounts of ammonium molybdate to the formulation. Furthermore, the moisture in the atmosphere was found to assist the extraction of the residual ethanol in the specimens. (literal)

Editore

• Aedificatio Publishers (Editore)

Prodotto di

• Metodologie integrate di diagnostica per la conservazione del patrimonio architettonico ed archeologico nel bacino del Mediterraneo (PC.P03.001.001) (Modulo)
• Indagini Innovative per il monitoraggio delle superfici di manufatti di interesse architettonico, storico-artistico e archeologico (PC.P03.009.001) (Modulo)
• Institute of archeological heritage - monuments and sites (IBAM) (Istituto)

Autore CNR

• MARIATERESA LETTIERI (Unità di personale interno)

Insieme di parole chiave

• Keywords of "Novel cold-cured epoxy-silica hybrids as potential adhesives for concrete/masonry rehabilitation: environmental aging" (Insieme di parole chiave)

Incoming links:

Prodotto

• Institute of archeological heritage - monuments and sites (IBAM) (Istituto)
• Indagini Innovative per il monitoraggio delle superfici di manufatti di interesse architettonico, storico-artistico e archeologico (PC.P03.009.001) (Modulo)
• Metodologie integrate di diagnostica per la conservazione del patrimonio architettonico ed archeologico nel bacino del Mediterraneo (PC.P03.001.001) (Modulo)

Autore CNR di

• MARIATERESA LETTIERI (Unità di personale interno)

Editore di

• Aedificatio Publishers (Editore)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi

• Restoration of buildings and monuments (Rivista)

Insieme di parole chiave di

• Keywords of "Novel cold-cured epoxy-silica hybrids as potential adhesives for concrete/masonry rehabilitation: environmental aging" (Insieme di parole chiave)