An attempt to reduce moisture movements beneath pavements on expansive soils using injected grout curtains


McManus, K. J.; Evans, R. P.


Flexible pavements founded on expansive soil in temperate climates, with long dry periods interspersed with short wet spells, are subject to deformation and early deterioration due to volume changes within the subgrade. This development of road roughness can affect passenger ride and safety, as well as cause heavy vehicles to experience body bounce and increase pavement loading, thus accelerating overall pavement deterioration. One accepted technique for reducing the development of roughness due to an expansive subgrade is to install vertical moisture barriers along the pavement edges, which reduces lateral moisture movement and associated volume changes within the subgrade. Overall, the construction of impermeable fabric or plastic vertical moisture barriers has been successful, but unfortunately it cannot be applied in all circumstances. This paper reviews the possibility of injected barriers and their construction for areas of residual expansive soils that contain core stones. It also discusses a laboratory testing program undertaken on the behaviour of lime fly-ash treated soils.

Publication year


Publication type

Conference paper


10th Road Engineering Association of Asia and Australasia (REAAA) Conference, Tokyo, Japan, 04-09 September 2000, no. 1, pp. 1-6


Road Engineering Association of Asia and Australasia


Copyright © 2000.