开封城墙修复土配合比试验  

Experimental on Mix Proportion of Restoration Soil for Kaifeng City Wall

作　　者：岳建伟[1,2] 杨雪 赵丽敏[1,2] 张大伟[1] YUE Jianwei;YANG Xue;ZHAO Limin;ZHANG Dawei(School of Civil Engineering and Architecture,Henan University,Kaifeng 475004,China;Key Laboratory for Restoration and Safety Evaluation of Immovable Cultural Relics in Kaifeng,Henan University,Kaifeng 475004,China)

机构地区：[1]河南大学土木建筑学院,河南开封475004 [2]河南大学开封市不可移动文物修复与安全评价重点实验室,河南开封475004

出　　处：《建筑材料学报》2022年第5期532-536,544,共6页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51978634);河南大学学科培育项目(2019YLZDCG05);河南省科技发展计划项目(212102310287,212102310271)。

摘　　要：为提高开封城墙抵御环境侵蚀的能力,采用甲基硅酸钠.石灰和胶粉作为外加剂,通过正交试验,对不同配合比修复土试样进行直接剪切试验、毛细吸水试验和扫描电镜测试,优化修复土的配合比.结果表明:甲基硅酸钠、石灰、胶粉的加入能有效提高修复土的力学性能和耐水性能;外加剂对修复土黏聚力的影响顺序为石灰>胶粉>甲基硅酸钠,对内摩擦角及耐水性能的影响顺序为甲基硅酸钠>石灰>胶粉;当甲基硅酸钠掺量为2.0%、石灰掺量为5.0%、胶粉掺量为2.0%时,修复土配合比最优.In order to improve the ability of Kaifeng city wall to resist environmental erosion,sodium methyl silicate,lime and rubber powder were used as admixtures,direct shear test,capillary absorption test and scanning electron microscopy test were carried out on the samples of restoration soil with different mix proportion through orthogonal tests to optimize the mix proportion of the restoration soil.The results show that the addition of sodium methyl silicate,lime and rubber powder can effectively improve the mechanical property and water resistance of the restoration soil.The influence order of admixtures on the cohesion of the restoration soil is lime>rubber powder>sodium methyl silicate.The influence order of admixtures on the internal friction angle and water tolerance is sodium methyl silicate>lime>rubber powder.The optimum mix proportion of restoration soil is 2.0% of sodium methyl silicate,5.0% of lime and 2.0% of rubber powder.

关 键 词：城墙修复 极差分析 力学性能 毛细吸水 

分 类 号：TU57[建筑科学—建筑技术科学]