Soil Stabilization with Waterproof Cement for Road Applications

Sand and clay soils are the most usually common soils that constitute the subgrade of roads in northern parts of Iran. The clay soil has high plasticity index. Also they have high strength in dry condition, in saturated state; they lose most of strength and during this time, sustain much swelling which is dangerous for pavement. Sandy soils in coastal zones are termed Beach sand and have considerable strength in confined state. However In unconfined state, because of their uniform gradation and lack of cohesion,
they will be washed out by water flow. In this research, the effects of Waterproof cement on engineering properties of these soils compared to Type 2 cement and Lime have been considered. In order to investigate the effects of the above materials on improving soil properties, Atterberg limit, Unconfined Compressive Strength and CBR tests have been carried out. It was found that the Waterproof cement has superior effect on strength properties of soils compared to the two other additives. The tests have also shown the average effect of this additive on the Plastic properties of soils.