Abstract Historical structure properties and indoor requirements should be taken into consideration in plaster layer mixture type selection during the historical building restoration. In the research, it has been aimed to increase the sound absorption coefficient in plaster layers with the direction of accurate restoration application decisions. In the plaster content, natural hydraulic lime binder which is frequently used in historical building restoration was researched and the pumice aggregate type instead of river sand aggregate was investigated to show the effect of lightweight aggregate type. The experimental analyses which are sound absorption, compressive strength, flexural strength, capillarity of water absorption and open porosity, were performed to compare different plaster layer types. The effects of aggregate combination volumetric ratio, polypropylene fiber ratio, flax fiber ratio, and crumb rubber additive ratio were analyzed. It was understood that sound absorption coefficients can be enhanced by means of the mortar mixture content changes and the use of lightweight aggregate type. Especially, the use of pumice aggregate instead of river sand aggregate in the mortar mixture can significantly increase the sound absorption coefficient in the range of 1400–2700 Hz. Also, the use of pumice aggregate instead of river sand aggregate has increased compressive strength and flexural strength remarkably in this research. It was especially observed that the use of additives which are listed as polypropylene fiber, flax fiber and crumb rubber in the mortar mixture, can be a very effective method to increase sound absorption performance not only in high frequencies but also low frequencies. As a result, the sound absorption research based on different mortar mixture types in plaster layers were systematically conducted to increase sound absorption coefficients in accordance with the historical building requirements.

中文翻译：

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浮石骨料和天然水硬石灰粘合剂制备的石膏吸声性能的研究与开发

摘要 在历史建筑修复过程中，石膏层混合料类型选择应考虑历史结构特性和室内要求。在研究中，以准确的修复应用决策为方向，旨在提高石膏层的吸声系数。在石膏含量方面，研究了历史建筑修复中经常使用的天然水硬性石灰粘合剂，并研究了浮石骨料类型代替河砂骨料，以展示轻质骨料类型的效果。进行了吸声、抗压强度、抗弯强度、吸水毛细作用和开孔率的实验分析，以比较不同的石膏层类型。分析了骨料组合体积比、聚丙烯纤维配比、亚麻纤维配比和胶粉添加剂配比的影响。据了解，可以通过改变砂浆混合物含量和使用轻骨料类型来提高吸声系数。特别是在砂浆混合物中使用浮石骨料代替河砂骨料可以显着提高1400-2700Hz范围内的吸声系数。此外，在这项研究中，使用浮石骨料代替河砂骨料显着提高了抗压强度和抗弯强度。特别观察到，在砂浆混合物中使用被列为聚丙烯纤维、亚麻纤维和碎胶的添加剂，是一种非常有效的方法，不仅可以提高高频吸音性能，还可以提高低频吸音性能。因此，根据历史建筑的要求，系统地进行了基于不同砂浆混合物类型的抹灰层吸声研究，以提高吸声系数。