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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。
Aiming at the microstructure change of cement emulsified asphalt mortar (CAM) under the coexistence condition of cement and emulsified asphalt, the microcosmic structure of CAM was proposed by means of SEM, EPMA and IR. Structure. The results show that there are some voids in the cured CAM, and there are protrusions and free bitumen on the surface of the slurry. Asphalt-encased fine sand and cement hydration products CSH gel and unhydrated cement particles form a spatial network structure. Department of Ca and Si oxide and its weight ratio and atomic ratio is relatively high, cement hydration products more, the structure is loose at the contrary; CAM in the inorganic materials such as cement and emulsified asphalt emulsion does not produce chemical reaction of asphalt , No new material generated. Increasing the amount of C-S-H and other gels in the CAM, the key to improving the mortar performance is to exert the adhesive properties of demulsified asphalt.