Cement-Modified Soil (CMS) and Cement-Stabilized Subgrade (CSS) are two types of Soil-Cement 人行道上的应用. Both CMS and CSS improve the physical properties of native in situ soils, and both help extend the life of a pavement by providing uniform support via a durable, stable, 典型的非膨胀路基. CMS treats soils with a relatively small proportion of portland cement to provide a stable working platform by reducing the plasticity and shrink/swell potential of unstable, highly plastic, wet, or expansive soils and increasing their bearing capacity. CSS not only provides all the benefits of CMS, but also substantially increases soil stiffness and strength to the point where the treatment provides structural benefits to pavements.
Cement Modification and Stabilization of Soils
CMS is a compacted mixture of pulverized in situ soil, water, and small proportions of cement that results in an unbound or slightly bound material. The treated material is similar to a soil but has reduced plasticity and a lower susceptibility to moisture, 从而得到一种更可行的材料. The principal benefits of CMS are as follows:
- Improves the workability of subgrade soils and their ability to be used in construction
- Reduces plasticity and shrink/swell volume change potential
- Reduces moisture susceptibility and migration
- Increases the speed of construction on sites due to the reduced impact of rain
- Increases bearing capacity compared to untreated soil
- Provides a significant improvement to the working platform
- Uses on-site soil rather than costly removal and replacement with select fill material
- Provides a permanent soil modification (does not leach)
CSS是紧凑的, engineered mixture of pulverized in situ soil, water, and moderate proportions of cement (slightly more cement than CMS) that results in a semi-bound to bound material. The treated material has structural engineering properties similar to or better than those of a granular material.
除了CMS的所有好处之外, CSS substantially improves soil stiffness and strength to the point where the treatment provides structural benefits to pavement and building foundations. The degree of improvement depends on the quantity of cement used and the type of soil. Therefore, by the addition of varying amounts of cement, it is possible to produce cement-stabilized subgrade with a wide range of engineering properties. Typical 7-day unconfined compressive strengths (UCS) for CSS range from 100 to 300 psi (0.7 to 2.1 MPa).
CSS provides all the characteristics and principle benefits of CMS plus the following:
- Provides typical 7-day unconfined compressive strengths from 100 to 300 psi (0.7 to 2.1 MPa).
- Potentially allows for a reduction in pavement thickness or increased pavement life