Browsing by Author "Mwakimi, Fadhili Simon"

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    Analyses of deteriorating structural materials: characterisation for establishment of their compatible repairs: acase study of In-situ Materials in Masonry structures in rungwe district Tanzania
    (University of Dar es Salaam, 2014) Mwakimi, Fadhili Simon
    Observations show that historic mortar masonry structures in Rungwe district continue deteriorating despite of their frequently repair interventions done by the local Authority using modern cement materials. Establishment of characteristics of in-situ historic mortar materials that were used during construction of these masonry structures and their appropriate compatible repair materials are not yet done. This study has established these characteristics through both field and laboratory characterization techniques. Field characterization was achieved through observations, investigations and sampling, oral local interviews, consultations with the Local Government officials while laboratory characterization involved testing and investigations of both in-situ and repair mix designed mortar through chemical mineralogical, physical and mechanical analyses. Characterization was achieved through observations, investigations and sampling, oral local interviews, consultations with the Local Government officials while laboratory characterization involved testing and investigations of both in-situ and repair mix designed mortar through chemical, mineralogical, physical and mechanical analyses. Characterization revealed that in-situ mortar was composed of natural sub-hydraulic lime to sand (1:2 and 1:3) mortal mixes. Investigations on mix design of repair mortar revealed that a mix of Jambo hydrated lime added with latent pozzoanic sand both from Tukuyu Mbeya were compatible and appropriate for existing in-situ substrate materials in terms of chemical, physical and mechanical properties and therefore recommended for repairs to existing buildings and as a partial replacement of modern cement in mortar for construction of one to two story masonry buildings within the region.