Improvement of coagulating strength and toughness of alkoxysilanes for conservation of cultural heritage
Improvement of coagulating strength and toughness of alkoxysilanes for conservation of cultural heritage
复制标题
提高烷氧基硅烷的凝结强度和韧性以保护文化遗产
DOI：
10.1002/app.53214
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发表时间：
2022
影响因子：
3
通讯作者：
Fujii Syuji
中科院分区：
文献类型：
--
作者：
Nakamura Yoshinobu;Nagao Asuha;Kontani Ryo;Nakane Yuta;Nakamura Takashi;Tsuruta Hiroaki;Suemori Kaoru;Suita Hiroshi;Hirai Tomoyasu;Fujii Syuji
研究了位于沙漠地区地下的4400年前建于埃及塞加拉的Idout墓的脆弱墙壁的最佳修复剂。从对坟墓附近收集的沙子的X射线衍射分析来看，主要成分是二氧化硅。使用烷氧基硅烷及其低聚物是因为其烷氧基可容易地与二氧化硅反应。对以白炭黑为主要成分的固化模型砂进行了抗压试验。低聚物分子量的增加和高分子量低聚物含量的增加有效地发展了压缩力。当地震发生时，希望加强墙的延性被压碎。将二烷氧基型烷氧基硅烷添加到低聚物中将失效模式从脆性改变为韧性，因为网络变得更松散。当适量的二烷氧基类型添加到低聚物中时，固化的模型砂以更大的位移变形，同时保持高的压缩力。从断口的扫描电镜观察，烷氧基硅烷起到了粘结剂的作用，使砂粒间相互连接。在粘合剂层中清楚地观察到许多裂纹。而对于二烷氧基添加的体系，形成的裂纹要小得多。
The optimal restoration agent for the brittle walls of Idout's tomb built 4400 years ago in Saqqara, Egypt, which is located underground in a desert area, was investigated. From x‐ray diffraction analysis of the sand collected near the tomb, the main ingredient is silica. Alkoxysilane and its oligomer are used because its alkoxy groups can react readily with silica. The compressive test of solidified model sand its main component is silica was done. The increase of both molecular weight of oligomer and the content of oligomer with higher molecular weight effectively developed the compressive force. When an earthquake occurs, it is desirable that the reinforced wall will be crushed in ductility. The addition of di‐alkoxy type alkoxysilane to oligomers changed the failure mode from brittle to ductile, because the network becomes looser. When a moderate quantity of di‐alkoxy type is added to oligomers, the solidified model sand deforms with greater displacement, while maintaining a high compressive force. From scanning electron microscopic observation of fractured solidified specimen, alkoxysilane was making the sand particles connect as a binder. Many cracks were clearly observed in the binder layer. Whereas, the formed crack was far smaller for di‐alkoxy added system.
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DOI：
10.21608/arcs.2020.111205
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