A study of the transport properties of emulsified asphalt powder-modified cement mortar

摘要

Emulsified asphalt powder (EAP) is a redispersible powder material prepared by spray drying process using emulsified asphalt as raw material that has been developed following the successful utilization of emulsified asphalt in the ballastless track structures of high-speed railways and in road and bridge engineering. In this study, the influence of EAP on the surface properties, transport properties and pore structure of cement mortar was investigated. The results revealed that EAP can improve the surface properties and reduce the transport properties of cement mortar. Furthermore, it was observed that there are intrinsic links between different transport property parameters of cement mortar incorporating EAP, and that the reduction of transport properties is essentially related to the increase of hydrophobicity and the improvement of pore structure afforded by EAP. The capillary water absorption and the drying mass loss of EAP-modified cement mortar decreased with the reduction of critical pore diameter, indicating that the addition of EAP beneficially reduced the transport properties of cement-based materials, thereby improving their durability. (C) 2020 Elsevier Ltd. All rights reserved.