INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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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,*
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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 |
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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%.
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Published: 25 May 2023
Online: 2023-05-23
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Fund:Scientific Research Funds of the Palace Museum in 2019 (KT2019-11). |
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1 Shan J X. Palace Museum Journal, 2015, 181(5), 6 (in Chinese). 单霁翔. 故宫博物院院刊, 2015, 181(5), 6. 2 Xu S Q. Study of hydration and carbonation mechanism of natural hydraulic lime and modification of its mortars. Master's Thesis, Beijing University of Chemical Technology, China, 2015 (in Chinese). 徐树强. 天然水硬性石灰固化机理及其砂浆改性研究. 硕士学位论文, 北京化工大学, 2015. 3 Lan M Z, Nie S, Wang J F, et al. Materials Reports, 2019, 33(9), 1512 (in Chinese). 兰明章, 聂松, 王剑锋, 等. 材料导报, 2019, 33(9), 1512. 4 Luo K. Research on the preparation and performance of natural hydraulic lime. Master's Thesis, Southwest University of Science and Technology, China, 2020 (in Chinese). 罗凯. 水硬性石灰的设计制备及性能天然研究. 硕士学位论文, 西南科技大学, 2020. 5 Xu S Q, Wang L L, Ma Q L, et al. Sciences of Conservation and Archaeo-logy, 2017, 29(4), 1 (in Chinese). 徐树强, 王乐乐, 马清林, 等. 文物保护与考古科学, 2017, 29(4), 1. 6 Yang J L, Song W W, Wang L G, et al. Bulletin of the Chinese Ceramic Society, 2018, 37(8), 2633 (in Chinese). 杨建林, 宋文伟, 王来贵, 等. 硅酸盐通报, 2018, 37(8), 2633. 7 Liu X B. Investigation of the chemical characteristics and bonding mec-hanism of Chinese traditional lime mortars, Master's Thesis, Zhejiang University, China, 2015 (in Chinese). 刘效彬. 中国传统灰浆的化学组成特征及粘结机理研究. 硕士学位论文, 浙江大学, 2015. 8 Lucía Garijo, Xiaoxin Zhang, Gonzalo Ruiz, et al. Construction and Building Materials, DOI:10.1016/j.conbuildmat.2019.117573. 9 Zhang Q, Li B, Zeng Q, et al. Advances in Cement Research, 2019, 32(8), 343. 10 Liang B, Wang J L. Science Technology and Engineering, 2019, 19(35), 322 (in Chinese). 梁波, 王菊琳. 科学技术与工程, 2019, 19(35), 322. 11 Sánchez J A, Barrios J, Barrios A, et al. Materiales de Construccion, 1997, 47(245), 17. 12 Xu S, Wang J, Jiang Q, et al. Journal of Cleaner Production, 2016, 119, 118. 13 Sandra Cunha, José Barroso Aguiar, Victor Ferreira, et al. Advanced Materials Research, 2013, 687, 255. 14 Arandigoyen M, Pérez Bernal J L, Bello López M A, et al. Applied Surface Science, 2005, 252(5), 1449. 15 Anna Arizzi, Javier Martínez Martínez, Giuseppe Cultrone, et al. Key Engineering Materials, 2011, 465, 483. 16 Sung-Hoon Kang, Yang-Hee Kwon, Juhyuk Moon. Construction and Building Materials, DOI:10.1016/j.conbuildmat.2020.118749. |
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