An evaluation of geology and weathering in the preservation of marl objects

摘要: Publisher Summary Marl is a sedimentary rock with composition between that of claystone and carbonate rocks. rarely encountered in artworks tends to show marked deterioration poses significant problems for conservation. The chapter describes the research on an Italian marl fireplace Victoria Albert Museum. purpose was study geology weathering explain poor state preservation such objects develop suitable conservation strategy. can be attributed combination mechanisms: due mineralogy, wetting-drying cycles, temperature variations, relative humidity (RH), overconsolidation. Variations had most dramatic influence degradation fireplace. focuses conducted determine response establish appropriate guidelines Experiments were designed examine sample extreme cycles humidity. experimental arrangement consisted micro-climate generator provided humidities measuring device recording dimensional change. deforms RH changes. experiments confirm responds ambient variations museum environment especially susceptible wetting by liquid water. This demonstrates effective related requires which kept relatively constant water should not used during treatment.