复掺天然植物油与青麻纤维对古建筑修复灰浆抗盐冻性能的影响  

Effect of Blending Natural Plant Oil and Hemp Fiber on Salt Frost Resistance of Ancient Building Restoration Mortar

作　　者：卢喆 姚文娟 王社良[1] 王善伟 刘博 LU Zhe;YAO Wenjuan;WANG Sheliang;WANG Shanwei;LIU Bo(College of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Qingdao Beiyang Architectural Design Co.,Ltd.,Qingdao 266100,Shandong,China;School of Architecture&Civil Engineering,Liaocheng University,Liaocheng 252059,Shandong,China;Post-doctoral Research Workstation,China Railway 20th Bureau Group Co.,Ltd.,Xi’an 710016,China)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]青岛北洋建筑设计有限公司,山东青岛266100 [3]聊城大学建筑与土木工程学院,山东聊城252059 [4]中铁二十局集团有限公司博士后科研工作站,西安710016

出　　处：《材料导报》2023年第12期248-256,共9页Materials Reports

基　　金：国家自然科学基金(51678480);陕西省教育厅重点实验室科学研究计划项目(17JS071);陕西省科技统筹创新工程重点实验室项目(2014SZS04-P04)。

摘　　要：以石灰、熟桐油和青麻纤维为主要原材料,设计并制备一种适用于古建筑修复的性能增强灰浆材料。采用宏观试验与微观试验相结合的方法探究了熟桐油和青麻纤维复掺情况下石灰灰浆强度、吸水率和耐水耐盐性等各项物理力学性能增强机理及在氯盐侵蚀-冻融循环环境下的耐久性能变化规律。结果表明:桐油的掺入可有效抵御水分与氯盐对灰浆浆体的侵蚀,并调控灰浆中碳酸钙的结晶类型,使其向性能更好的球霰石和文石转变,形成更为致密的微观结构。青麻纤维可以在灰浆中起到较好的加筋与桥联阻裂作用,提升灰浆抗压强度与抗折强度,同时抑制冻融环境下灰浆裂缝的扩展,提升灰浆抗冻性。其中掺加5%桐油与1.5%麻纤维的LO5H组灰浆性能最优,其90 d抗压强度与抗折强度较石灰灰浆分别提高了45.3%与182%,在水/氯盐环境下的耐冻融循环次数较石灰灰浆均提升了约五倍,提升效果较为明显。Using lime,tung oil and hemp fiber as the main raw materials,a performance-reinforced mortar material suitable for the restoration of ancient buildings was designed and prepared.The enhancement mechanism of physical and mechanical properties such as strength,water absorp-tion,water and salt resistance of lime mortar and the change law of durability in chloride salt erosion freeze-thaw cycle environment were studied by combining macro test and micro test.The results show that the addition of tung oil can effectively resist the erosion of water and chloride on the mortar,and regulate the transformation of the crystal type of calcium carbonate in the mortar to better aragonite and aragonite to form a more dense microstructure.Hemp fiber can play a good role in reinforcing and bridging crack resistance in mortar,and improve the compressive strength and flexural strength of mortar.Moreover,the expansion of mortar cracks in freeze-thaw environment is restrained and the frost resis-tance of mortar is improved.The performance of LO5 H mortar mixed with 5%tung oil and 1.5%hemp fiber is the best.Its 90 d compressive strength and flexural strength are 45.3%and 182%higher than that of lime mortar,and its resistance to freeze-thaw cycles in water/chloride envi-ronments are both 5 times higher than that of lime mortar.The improvement effect is obvious.

关 键 词：古建筑修复 桐油灰浆 氯盐侵蚀 冻融循环 核磁共振(NMR) 微观结构 

分 类 号：TU502[建筑科学—建筑技术科学]