The aim of the present study is to assess if recycled gypsum from plasterboard waste can be added to earth plastering mortars instead of raw calcium sulphate hemihydrate when a mineral binder addition is foreseen to improve durability. Earth mortars with additions of 0 %, 5 %, 10 % and 20 % vol. of raw hemihydrate, gypsum milled from plasterboards with and without thermal treatment were produced and tested. In general, the additions led to an overall improvement in mechanical strength and resistance to water and did not significantly influence the hygroscopicity of the earth plaster. In general, earth mortars with untreated gypsum waste achieved comparable to superior results compared to mortars with treated gypsum waste, indicating the viability of using recycled gypsum from plasterboard without thermal treatment as earthen plaster addition.

中文翻译：

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土石膏的湿热和机械性能：添加石膏板和生半水物回收石膏的效果


本研究的目的是评估当预计添加矿物粘合剂以提高耐久性时，是否可以将石膏板废料中回收的石膏添加到土坯灰泥中，而不是生硫酸钙半水合物中。生产和测试了添加 0 %、5 %、10 % 和 20 % 体积的生半水物、石膏，石膏在经过和未进行热处理的情况下研磨而成。一般来说，添加导致机械强度和耐水性的整体提高，并且没有显着影响土石膏的吸湿性。一般来说，与使用处理过的石膏废料的砂浆相比，使用未经处理的石膏废料的土砂浆取得了相当的卓越效果，这表明使用未经热处理的石膏板回收石膏作为土制石膏添加物的可行性。