基于动态模量成像的硬化水泥浆体微观物相的识别  

Phase Identification in Cement Paste by Modulus Mapping

作　　者：高翔[1,2] 魏亚[1] 黄卫[2] 

机构地区：[1]清华大学土木工程系土木工程安全与耐久教育部重点实验室,北京100084 [2]东南大学教育部智能运输系统研究中心,南京210096

出　　处：《材料研究学报》2016年第5期321-328,共8页Chinese Journal of Materials Research

基　　金：国家自然科学基金51578316资助项目~~

摘　　要：使用动态力学分析的模量成像技术对硬化水泥净浆进行微观层次上的物相识别,根据不同物相弹性性质的差异得到了目标区域的储能模量图,辅以形貌观测、成分分析和原位静态压痕手段,准确识别了未水化颗粒及其周边的高密度(High density,HD)和低密度(Low density,LD)CSH凝胶。结果表明,HD CSH凝胶和LD CSH凝胶的化学成分一致,其各自的典型动态模量分别为36GPa和24GPa,具有较好的区分度,且该值与同样表征物相弹性性质的压痕模量数值近似,动态模量成像图可给出清晰的物相边界。用该方法分析硬化水泥浆体微观性能,可避免由于不能准确定位各物相而引起盲目性和重复工作,有助于有的放矢地研究目标物相。Phases in cement paste can be identified in micro scale by dynamic mechanical analysis （DMA） based modulus mapping owing to the characteristics of this technique： rapid, precise, high resolu-tion and non-destructive. According to the storage modulus mapping which reflects the differences of elastic properties, the unhydrated clinker, as well as the high density calcium silicate hydrate （CSH） gel and low density CSH gel, which surrounded the clinker can be recognized with the assistance of morphology observation, components analysis and in-situ static indentation etc. Results show that the chemical composition of HD CSH and LD CSH is the same, while their storage modulus are 36GPa and 24GPa respectively, and the phase identification can be accomplished by taking the individual storage modulus into account. Therefore, blindness and repetition in traditional experiments can be avoided by employing the method of DMA-based modulus mapping, and then the properties of interested phase can be acquired with targeted approach.

关 键 词：无机非金属材料 硬化水泥浆体 动态力学分析 模量成像 物相识别 CSH凝胶 储能模量 

分 类 号：TB321[一般工业技术—材料科学与工程]