改性料礓石力学性质试验  

Test on mechanical characteristics of modified ginger nut

作　　者：陈卫昌[1] 王思敬[1] 李黎 张晓平 王彦兵[1,4] CHEN Wei-chang;WANG Si-jing;LI Li;ZHANG Xiao-ping;WANG Yan-bing(Key Laboratory of Shale Gas and Geological Engineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China;Institute of Heritage Restoration, Chinese Academy of Cultural Heritage, 100871, China;School of Civil and Architectural Engineering, Wuhan University, Wuhan, Hubei, 430071, China;Beijing Economic and Technical Research Institute, State Grid, Beijing, 102209 China)

机构地区：[1]中国科学院地质与地球物理研究所页岩气与地质工程重点实验室,北京100029 [2]中国文化遗产研究院文物修复所,北京100871 [3]武汉大学土木建筑工程学院,湖北武汉430071 [4]国家电网北京经济技术研究院,北京102209

出　　处：《岩土力学》2018年第5期1796-1804,共9页Rock and Soil Mechanics

基　　金：国家科技部支撑计划课题(No.2013BAK08B11;No.2014BAK16B02)~~

摘　　要：改性料礓石作为一种传统硅酸盐建筑材料,可以与修复加固的文物本体很好兼容且牢固结合,现阶段已经运用到文物保护工作中。为研究其全面的力学特性,在前人研究基础上,采用伺服刚性试验机对改性料礓石进行了不同围压下的常规三轴试验、单轴压缩试验及巴西劈裂试验。试验结果表明:材料具有较高的抗压强度和抗拉强度,同时具有韧性特征。在低围压时,试样表现为剪切破坏,当围压超过6 MPa时,试样表现出明显的塑性流动特征,且试样的峰值强度与围压近似线性关系。通过绘制莫尔圆包络线计算出抗剪强度参数c、φ值,并分析了峰值应变、弹性模量和围压的关系。分析改性料礓石结石体的微观结构及固化过程中的化学成分变化,认为水化和碳化产物包裹石英砂颗粒的特殊结构,是材料具备韧性特征的原因。研究结果对改性料礓石的应用及文物修复的现场工作具有重要的意义与价值。As the earliest concrete in the world, the modified ginger nut has been proved to be proper restoration material for restoring Chinese ancient buildings and cultural relics. In order to study mechanical properties of modified ginger nut, we carry out conventional triaxial compression tests on modified ginger nut. During triaxial test, the failure surfaces are shear failure under low confining pressure （2 MPa）. When the confining pressure increases to 6 MPa, there are no obvious failure surfaces but only volume expansion. Mohr circle envelopes are drawn to calculate shear strength parameters. The triaxial test results indicate that the peak strength, peak strain and elastic modulus linearly increased with the increase of confining pressure. The test results indicate that the modified ginger nut has strong deformation capacity as well as mechanical strength. Based on XRD diffraction results and SEM images, we find that quartz particles are covered by hydration and carbonation product and this special structure may be the likely reason to explain why the mechanical strength and deformation capacity are high. The presented results are also expected to provide useful references to the restoration of cultural relics engineering.

关 键 词：改性料礓石 力学性能 应力-应变曲线 

分 类 号：TU411[建筑科学—岩土工程]