Yazar "D'Ayala, Dina" seçeneğine göre listele

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    Climate threats to the earth-built heritage of Scotland
    (Ice Publishing, 2015) Parkin, Simon J.; Adderley, W. Paul; Kennedy, Craig J.; Aktaş, Yasemin Didem; D'Ayala, Dina; Erkal, Aykut
    The most significant concentration of surviving vernacular mudwall structures in Scotland is found in and around the town of Errol in the Carse of Gowrie. Mudwall, or cob, is particularly susceptible to climate-related impacts such as water ingress and freeze-thaw cycles. A lack of recognition can exacerbate the effects of these factors significantly. Using two sites as representative case studies, this paper considers the issues typically encountered. The procedures used in monitoring the performance of each building within a regional climate context are outlined. Using climate models and current weather data, the local climatic context within which these structures exist is considered. Climate-related impacts can then be considered for future scenarios. Temperature and humidity data were collected concurrently from targeted areas within the walls of both structures for over a year from April 2012, a period that exhibited a range of extreme weather events in the Carse of Gowrie. The system of datalogging at each structure is discussed and results considered against external weather conditions using decomposed time series statistical analysis. Recommendations are offered considering how an integrated approach to the analysis of historic mudwall structures can be achieved.
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    Environmental performance assessment using monitoring and DVS testing
    (Ice Publishing, 2015) Aktaş, Yasemin Didem; D'Ayala, Dina; Erkal, Aykut; Stephenson, Victoria
    It is now widely accepted that the adverse effects of climate change have become more visible over recent last decades, and current climatic trends suggest that more severe conditions are to follow. In relation to extreme weather events due to climate change, various material degradation phenomena and loss of structural integrity, due mostly to moisture-related deteriorating agents, have been observed on the existing building stock, especially historic buildings. The identification and quantification of such adverse effects is therefore of utmost importance, and environmental monitoring is one of the strongest tools to achieve this aim. This paper provides detailed information regarding on-site environmental monitoring work carried out on a sixteenth century timber frame cottage in Tewkesbury, Gloucestershire, England, along with hygroscopic characterisation using the dynamic vapour sorption (DVS) technique. The results obtained from monitoring and DVS testing are discussed to give detailed insight into hygrothermal damage mechanisms and the resulting loss of strength/physical integrity due to adverse environmental impacts on historic building envelopes.
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    Evaluation of environmental impact on historical stone masonry through on-site monitoring appraisal
    (Geological Soc Publ House, 2013) Erkal, Aykut; D'Ayala, Dina; Stephenson, Victoria
    This paper presents the design and application of an environmental monitoring system on the historical site of Odda's Chapel in Deerhurst, Gloucestershire, UK, and the determination of hygroscopic behaviour of the original building materials to obtain long-term moisture content variation. The monitoring system provides a comprehensive profile of hygrothermal conditions in the walls at the locations where moisture conditions are potentially causing decay and damage. The system makes use of temperature and relative humidity sensing technology placed on the wall construction, providing continuous data including rainfall, wind-driven rain and runoff rain measurements. The relative merits and results of the designed system are evaluated and discussed, as well as the implications of its application in the conservation of historical structures. The environmental monitoring results show general deterioration in the shell of the building. Internal wall surface measurements are essential for the documentation of wall interior response and should be conducted across the wall section at several locations. The fact that 91% of in-wall recorded relative humidity (RH) values are greater than 75% RH throughout the monitoring period demonstrates the need for measures to conserve this historical stone masonry.
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    Laboratory testing of non-standard original historic building materials and related implications for conservation
    (Geological Soc Publ House, 2015) Erkal, Aykut; D'Ayala, Dina
    For an assessment or an analysis of a historic building, determination of the material properties is always crucial. However, this is usually a challenging issue because material extraction from a historic building for standard laboratory testing is usually not allowed or the amount of material available for testing is very limited. Lack of comprehensive standards for testing irregularly shaped and non-standard-size specimens, taken from historic buildings, unfortunately compounds the uncertainty. This paper offers a discussion of such issues by using the case study of Odda's Chapel in Gloucestershire, UK, and describing the systematic examination of a total of six lime mortar and Blue Lias stone samples extracted from this Grade I listed building. The programme of testing and the results obtained are compared with the latest European standards relating to sampling and testing of material of cultural properties. Internal microstructure, hygroscopic sorption and water absorption characteristics, and the density and mechanical properties of the materials are documented and alternative testing techniques are compared. Identification of some of the above-mentioned material properties shows that the agreement between results obtained from the various test methods is considered satisfactory, depending on the testing approach and material heterogeneity.