Page 130 - RoadCem Manual - PCT BV

Generally, the thinner the surfacing layer is, the more likely the damage, primes being the most susceptible and thick, impermeable seals the least susceptible.
Figure 5.23 Saline soils
RoadCem/Cement offers an opportunity to avoide these saline effects as it will prevent salt migration to the surface of the pavement structure.
5.3 Making Good” Pavement Materials “from “Bad” Pavement Materials
Most of the time suitable naturally occurring gravels are not available within an economical haulage distance.
The In-situ material can be transformed through stabilization into a suitable material. Economically, stabilization of insitu material becomes the method of choice. Stabilization is the process by which additives are used to enhance the properties of subgrade and pavement materials - in order to improve the materials’ properties, including strength, volume stability, durability and permeability.
The additives in traditionally used are:
• Portland cement.
• Lime (quicklime and hydrated lime).
• Pozzolans (fly-ash, pumice, scoria).
• Bitumen and tar.
• More recently to the above we can now add.
• Portland cement and/or Fly-Ash in combination with RoadCem.
The following factors influence the selection of the most suitable method of treatment:
• Site constraints.
• Materials.
• Climate and drainage.
• Economics of the various options (performance, durability, maintenance, cost). 130