Influence of the Ratio of Chalked Lime on the Performance of Pastes in the Restoration of Ancient Buildings
ZHANG Dian1, WANG Hui1, CHEN Shaohua2,3, WANG Julin2,3,*
1 The Palace Museum, Beijing 100009, China 2 School of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China 3 Key Research Base of State Administration of Cultural Heritage for Evaluation of Science and Technology in Cultural Relics Protection Field, Beijing 100029, China
Abstract: At the restoration site of ancient building, it is inevitable that the raw material of lumpy quicklime will be chalked and deteriorated, and it is also inevitable to mix chalked lime in the actual construction. In order to explore the influence of the ratio of chalked metamorphic lime on the performance of paste, the purity and metamorphism degree of lumpy quicklime and chalked lime were qualitatively and quantitatively analyzed by X-ray diffraction (XRD), X-ray fluorescence spectrum (XRF) and thermogravimetric analysis (TG). Then samples were prepared with the same water-binder ratio and different proportions of chalked lime for performance comparison and mechanism research. The results show that the raw material lime has high purity, the lumpy quicklime is pure CaO without metamorphism. The chalked lime was partially deteriorated, and the content of CaCO3 was 17.93%. The increase in the ratio of chalked lime reduces the surface hardness of the sample, has little effect on the mecha-nical strength of the sample cured for 28 days, and there is a tendency to increase the mechanical strength of the sample after curing for 60 days. When the proportion of chalked lime reaches 50%, the water resistance and freeze-thaw resistance of sample are reduced. According to the analysis of dry apparent density, porosity, water absorption, carbonation depth and scanning electron microscope (SEM) results, it is concluded that the difference in performance is mainly due to the decrease of cementation of chalked lime, less water needed for sample preparation, and more residual free water in the same water-binder ratio, which leads to low density, high porosity and water absorption of samples containing chalked lime, thus accelerating carbonation. In the actual construction, the ratio of chalked lime should be controlled within 40%.
通讯作者:
*王菊琳,北京化工大学材料科学与工程学院教授、博士研究生导师。1989年南京化工学院(南京工业大学)腐蚀与防护专业本科毕业,2000年北京化工大学材料学专业硕士毕业,2004年北京化工大学材料物理博士毕业后留校工作至今。目前主要从事文物保护、材料劣化机理研究。发表论文80余篇,包括在Corrosion Science、Applied Surface Science、Rare Metals、Construction and Building Materials等期刊上发表的论文。julinwang@126.com
张典, 王辉, 陈绍华, 王菊琳. 古建筑修缮中粉化石灰的占比对灰浆性能的影响[J]. 材料导报, 2023, 37(10): 21070075-6.
ZHANG Dian, WANG Hui, CHEN Shaohua, WANG Julin. Influence of the Ratio of Chalked Lime on the Performance of Pastes in the Restoration of Ancient Buildings. Materials Reports, 2023, 37(10): 21070075-6.
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