CRTSⅠ型水泥乳化沥青砂浆的毛细吸水特性

Capillary Water Absorption Behavior of CA Mortar

为探讨CRTSⅠ型水泥乳化沥青砂浆中水的迁移规律,对水在不同表面的接触角和毛细吸水质量随吸水时间的变化进行了测定,并对不同砂浆断面进行了扫描电子显微镜(SEM)和能谱(EDS)分析.结果表明:与普通多孔材料一样,水泥乳化沥青砂浆单位面积的吸水质量与吸水时间的1/2次方成正比;CRTSⅠ型水泥乳化沥青砂浆与灌注袋界面处的"三明治"结构是其毛细吸水系数随吸水时间延长而大幅度降低的原因;CRTSⅠ型水泥乳化沥青砂浆表面打磨可形成富沥青膜层,增大水在其表面的接触角,并使毛细吸水系数降低45%以上;施工时,灌注袋袋口砂浆的自然断面宜进行处理,以降低其毛细吸水系数.

In order to investigate the character of water transportation in cement-emulsified asphalt mortar（CA mortar） for CRTS（China railway track system） Ⅰ-type slab ballastless track（CRTS Ⅰ-type CA mortar）,changes in the contact angle of water and mass of capillary water adsorption with time were tested,and the SEM（scanning electric microscopy） and EDS（energy dispersive spectrometer） were used to detect the fracture surfaces of the CA mortar.The research results show that like a normal porous material,the mass of capillary water adsorption of the CA mortar has a linear relationship with the extraction of time.The ＂sandwich structure＂ of the interface between CRTSⅠ-type CA mortar and a pouring bag is the reason for the large decrease of the capillary water adsorption coefficient.From the SEM analysis,an asphalt-rich film can be formed on the surface of the CA mortar by polishing to increase the contact angle of water and reduce about 45% of the capillary water adsorption coefficient.In addition,the nature fracture surface of the CA mortar at the perfusion port should be processed during the construction.