摘要
针对水泥和乳化沥青共存条件下,水泥乳化沥青砂浆(CAM)微观结构的变化,采用扫描电镜(SEM)、电子探针(EPMA)和红外光谱(IR)等微观试验手段,提出了CAM的微观结构特征。结果表明,硬化后的CAM内部存在一定的空隙,浆体表面存在突起和自由沥青,沥青包裹的细砂、水泥水化产物C-S-H凝胶和未水化水泥颗粒组成空间网络结构;CAM中结构致密处Ca和Si及其氧化物的重量比和原子比相对较高,水泥水化产物较多,结构疏松处则相反;CAM中的水泥等无机材料不与乳化沥青破乳产生的沥青发生化学反应,没有新物质的生成。增加CAM中C-S-H等凝胶体的数量,发挥破乳沥青的粘附性能是改善砂浆性能的关键。
As to micro structure change of cement emulsified asphalt mortar （CAM） with two kind of binding materials, cement and asphalt emulsion, some micro-test methods were adopted, such as Scanning Electron Microscope （SEM）, Electron Micro-probe Analysis （EPMA） and Infrared Spectroscopy （IR）, to analyze CAM microstructure and microstructure characters were put forward. The results indicates that there exited some voids in the CAM and much free asphalt on the mortar surface, which is not even. A net structure is developed being composed of fine sand packed with asphalt, C-S-H gel, a cement hydration product and non-hydration cement particle. Mass percent and atom percent of Ca, Si and their oxides in dense CAM were higher relatively and there are more cement hydration products, while they are not so in loose mortar. Because there is not any reaction between cement and asphalt made from asphalt emulsion de-emulsification, no new substance is made, Quantity increases of gels, such as C-S-H and adhesion improvement of asphalt are the key measures to improve performance of CAM.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2009年第14期23-26,共4页
Journal of Wuhan University of Technology
基金
长安大学科技发展基金(2008Q2)
