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An examination of the suitability of paperclay as a gap filler for ceramic artefacts

Srinivasan, Jaishree

Description

Paperclay is a composite made by the addition of paper pulp to any type of clay. This thesis examines the suitability of paperclay as a detachable gap filler to repair lost sections in earthenware ceramic artefacts. Normal clay fills used in ceramic conservation have high shrinkage rates between production and end, fired stage. While paper pulp in the clay would not improve shrinkage, it is postulated that it would improve its working properties and green strength, resulting in a more versatile...[Show more]

dc.contributor.authorSrinivasan, Jaishree
dc.date.accessioned2018-11-22T00:05:17Z
dc.date.available2018-11-22T00:05:17Z
dc.date.copyright2011
dc.identifier.otherb2638800
dc.identifier.urihttp://hdl.handle.net/1885/150260
dc.description.abstractPaperclay is a composite made by the addition of paper pulp to any type of clay. This thesis examines the suitability of paperclay as a detachable gap filler to repair lost sections in earthenware ceramic artefacts. Normal clay fills used in ceramic conservation have high shrinkage rates between production and end, fired stage. While paper pulp in the clay would not improve shrinkage, it is postulated that it would improve its working properties and green strength, resulting in a more versatile fill material. Properties of paperclay, namely, shrinkage, green and fired strength, porosity, working properties and resistance to mould growth were tested. All tests were conducted on six earthenware clay samples with incremental additions of 0%, 1%, 2%, 3%, 4%, and 5% w/w paper pulp, fired to three temperatures (790{u00BA} C, 945{u00BA}C and 1101{u00BA}C). Percentage shrinkage was calculated by measuring the volumes of dry and fired samples. Green strength was tested by performing flexural strength tests on unfired, dry samples. Compressive strength tests were performed on fired and unfired samples. Porosity tests were conducted on fired samples to examine the relationship between porosity and fired strength. The susceptibility of the unfired composite to mould growth at elevated relative humidity levels and warm temperatures was also examined. Analysis of the data showed a two-fold improvement in raw strength and a five{u00AD}fold improvement in working properties of paperclay with 2% w/w paper pulp. Shrinkage rates were close to 0% at 1040{u00BA}C (Cone 05) for this percentage composition. The compressive strength of the raw and fired 2% composite (3.8 MPa and 20.4 MPa) equates to its ability to withstand a load of approximately 40 kg/cm{u00B3} for the raw composite and 200 kg/cm{u00B3} for the sample fired to Cone 06. Thus the 2% paperclay composite fired to Cone 05, satisfied all the requirements of a gap filler in a museum environment. Additions of paper pulp in the raw composite make it susceptible to mould attack under elevated humidity conditions. Further research is recommended to find a mould inhibitor or a conservation grade coating/varnish that would act as a barrier to moisture and mould attack.
dc.format.extentx, 269 leaves.
dc.language.isoen_AU
dc.rightsAuthor retains copyright
dc.subject.lccTP811.S75 2011
dc.subject.lcshPaper clay Analysis
dc.subject.lcshCeramics Conservation and restoration
dc.titleAn examination of the suitability of paperclay as a gap filler for ceramic artefacts
dc.typeThesis (MPhil)
local.description.notesThesis (M.Phil.)--Australian National University, 2011
dc.date.issued2011
local.type.statusAccepted Version
local.contributor.affiliationAustralian National University. College of Engineering & Computer Science
local.identifier.doi10.25911/5d611a23c97d4
dc.date.updated2018-11-20T06:25:10Z
dcterms.accessRightsOpen Access
local.mintdoimint
CollectionsOpen Access Theses

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