Soil cement is a construction material. It is a mix of pulverized natural soil with small amounts of Portland cement and water. Soil cement is processed in the same manner as Roller Compacted Concrete (RCC) or Cement-Treated Base (CTB) using a twin-shaft continuous mixing plant and later compacted to form a high density base. The dense, hard and semi-rigid durable material is formed by hydration of the cement particles. The engineered mix is a stronger, permanent sub-grade for enhanced pavement support and capacity and will provide the following benefits:
Improved characteristics for marginal on-site soils
Reduced plasticity and improved strength
Less susceptible to damaging effect of water
Can create an all-weather work platform
Use of on-site soil rather than removal and replacement with expensive select fill material
Permanent soil modification (does not leach)
No mellowing period required
Soil cement is frequently used as a construction material for pipe bedding, slope protection, and road construction to reinforce and protect the sub-grade. It has good compressive and shear strength, but is brittle and has low tensile strength, so it is prone to forming cracks.
Soil cement mixtures differ from Portland cement concrete in the amount of paste (cement-water mixture). Where in Portland cement concrete the paste coats all aggregate particles and binds them together; soil cement uses a reduced amount of cement and voids are left in the material which results in a cement matrix with nodules of un-cemented material.
Four variables control the properties and characteristics of Soil cement:
(1) the nature of the soil material-whether it's clay, silt, sand, coarse aggregate, or a combination;
(2) the proportion of cement in the mix;
(3) moisture conditions, such as the moisture content of mix at the time of compaction and curing conditions (moisture, temperature and time); and
(4) the degree of compaction.
Silt and clay soils, particularly when they are wet, can lead to construction problems. These soils can often be soft, plastic, and difficult to compact. Using our high-intensity, high-output, twin-shaft continuous mixing plant, Soil cement can be mixed and used to improve the properties and construction characteristics of silt and clay soils by reducing this plasticity and enhancing the compaction and strength of the treated soil.