Ground Reinforcement & Subgrade Stabilisation
Geosynthetics provide many benefits over traditional construction techniques where soils, subbases, subgrades, foundations, slopes and trafficked surfaces are constructed. By reducing traditional stone construction layers; the use of geogrids, geocells and geotextiles have become the engineered, environmental and cost-effective solution for such civil engineering projects.
Subgrade Stabilization
Stabilization refers to a subgrade treatment intended to provide structural stability for improved long-term performance. Removal and replacement, as the name indicates, involves removal of the unsuitable subgrade soil and replacement with a select material (usually granular backfill).
Subgrade Stabilization is the use of geosynthetic reinforcement elements to provide constructability and access over very soft soils. Its use establishes a well-compacted non-yielding platform with uniform load support.
How do you stabilize subgrade?
stabilization. This is achieved through addition of lime, Portland cement, fly ash and/or other chemicals to the soil to change the chemical and physical properties of the subgrade.
What are the types of subgrade materials?
The most commonly used methods of chemical stabilization of subgrade soils are cement, lime, fly ash, lime-fly ash, cement-lime, and salts. These materials are mixed with the subgrade soils and are allowed a curing period to react with the soil and harden.
How can I improve my subgrade strength?
[4] found that adding 20% to 40% sand mixed with 2% cement increased the soil resistance strength. Other researchers have added CKD to swelling soil, as Keerthi et al. [5] found that using up to 50% CKD added to swelling soil could increase its strength [5].
What is a subgrade in construction?
Subgrade is that portion of the earth roadbed which after having been constructed to reasonably close conformance with the lines, grades, and cross-sections indicated on the plans, receives the base or surface material. In a fill section, the subgrade is the top of the embankment or the fill.
What is the function of subgrade in railway track?
Their function is to improve load spreading and increase track stiffness, as well as providing a free draining formation. The subgrade is the upper part of the earthworks or natural ground upon which the capping layers and ballast layers are placed.