Characterization of ancient, byzantine and later historic mortars by thermal and X-ray diffraction techniques

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dc.contributor.author Moropoulou, A en
dc.contributor.author Bakolas, A en
dc.contributor.author Bisbikou, K en
dc.date.accessioned 2014-03-01T01:10:53Z
dc.date.available 2014-03-01T01:10:53Z
dc.date.issued 1995 en
dc.identifier.issn 0040-6031 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/11469
dc.subject Cementitious mortars en
dc.subject Crushed brick mortars en
dc.subject Gypsum mortars en
dc.subject Historic mortars en
dc.subject Hydraulicity en
dc.subject Modern cement mortars en
dc.subject Portlandite mortars en
dc.subject TG-DTG evaluation en
dc.subject Thermal transformation en
dc.subject Typical lime mortars en
dc.subject.classification Chemistry, Analytical en
dc.subject.classification Chemistry, Physical en
dc.title Characterization of ancient, byzantine and later historic mortars by thermal and X-ray diffraction techniques en
heal.type journalArticle en
heal.identifier.primary 10.1016/0040-6031(95)02571-5 en
heal.identifier.secondary http://dx.doi.org/10.1016/0040-6031(95)02571-5 en
heal.language English en
heal.publicationDate 1995 en
heal.abstract The characterization of mortar properties can be accomplished by the use of thermal analysis. DTA can be used to identify various component materials and observe the reactions associated with controlled heating of the mortar. This method reveals thermal transformations, which include dehydration, dehydroxylation, oxidation and decomposition. In addition, crystalline transitions can be observed, which are exothermic or endothermic in nature. With TGA, thermogravimetric analysis, the mass of the sample is monitored (weight loss) as a function of temperature. Weight losses at reaction temperatures near 750°C, indicate loss of CO2 not from pure CaCO3, but from recarbonated lime. The dehydroxylated clays acted as a ""pozzolan"" which imparts early strength to the mortar. However, a more complex phenomenon occurs in crushed brick mortar, since compounds of hydraulic type occur at the brick matrix interface also. The DTA and TG-DTG analyses identify the dehydration of calcium alumino-silicate phases, giving clear evidence of a cementitious mortar rather than one of pure lime. In the present work a spectrum of thermal and XRD analysis results from ancient, Byzantine, post-Byzantine and later historic mortars from Greece is presented and the relevant information concerning the characterization of traditional mortars is validated. Generally, the CO2 bound to carbonates and the water bound to hydraulic components (in weight loss%) discern two groups of mortars, the typical lime and the hydraulic, respectively. The specific classification of mortars into groups with characteristic transformations indicated by weight loss against temperature, enables discernment of: typical lime, cementitious, with crushed brick, with portlandite, with gypsum, with modern cement or of hot lime technology, mortars. Mineralogical, microstructural, mechanical and technological data could provide further evaluation criteria. © 1995. en
heal.publisher ELSEVIER SCIENCE BV en
heal.journalName Thermochimica Acta en
dc.identifier.doi 10.1016/0040-6031(95)02571-5 en
dc.identifier.isi ISI:A1995TQ42700068 en
dc.identifier.volume 269-270 en
dc.identifier.issue C en
dc.identifier.spage 779 en
dc.identifier.epage 795 en

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