Research on water seepage of cement asphalt emulsified (CA) mortar: Fid-Bau Portal

Research on water seepage of cement asphalt emulsified (CA) mortar

Wang, Tao / Jia, Hengqiong / Li, Honggang / Li, Haiyan / Shao, Piyan

Highlights•The seepage rate of CA mortar is closely related to the environment temperature.•The seepage rate in small scale mortar shows “size effect”.•The seepage rate of the CA mortar is positively correlated to its expansion rate.•The early expansion of CA mortar is caused by the gas generation of aluminum powder.•The effects of the seepage on CA mortar composition can be neglected.

AbstractIn this paper, water seepage of cement asphalt emulsified mortar (CA mortar) was studied in a small-scale track model, including the seepage rate, the chemical composition of the seeping water and its effects upon CA mortar. It is shown that the seepage time is negatively correlated to the environment temperature. A higher temperature would lead to a shorter seepage time, while the cumulative amount of seepage is similar. Seepage may be induced by the volume expansion of CA mortar in the early age, which is evidenced by a positive correlation between the seepage rate of the small-scale mortar sample and the expansion rate measured on a cylindrical sample. The solid components in the seeping water is low, initially less than 12% and ultimately at 3–4%, thus has negligible effect on the mix proportion. In addition, a “size effect” is noted, in which the water seepage is more significant in the field, compared with the small-scale model.