Soil Stabilization
Over Weak Subgrades
Over Saturated Subgrades
Over Sabkha Soils
over Weak Subgrades
One of the principal applications of geosynthetics in road pavements has been as a separator and reinforcement between the base course or subbase and subgrade. ALFGRID is a multifunctional geocomposites that provides SEPARATION, FILTRATION and REINFORCEMNT. ALFGRID is composite made through thermal lamination of a reinforcing BiAx geogrid with a polyester filter fabric. The polyester filter fabric provides the functions of separation and filitration. The BiAx reinforcement geogrid with its 3-D rib geometry and stiff integral junctions provides mechanical interlock of the overlying material.
over Weak Subgrades
One of the principal applications of geosynthetics in road pavements has been as a separator and reinforcement between the base course or subbase and subgrade. ALFGRID is a multifunctional geocomposites that provides SEPARATION, FILTRATION and REINFORCEMNT. ALFGRID is composite made through thermal lamination of a reinforcing BiAx geogrid with a polyester filter fabric. The polyester filter fabric provides the functions of separation and filitration. The BiAx reinforcement geogrid with its 3-D rib geometry and stiff integral junctions provides mechanical interlock of the overlying material.
over Saturated Subgrades
Design of pavements in hot and arid climates need to address the problem of capillary rise of ground water. In this environment, moisture rises up into the base course through capillary function leading to saturation of the base courses. Saturation of the base course changes the dynamics of vertical stress distribution, and may allow transfer of traffic loads directly to subgrade soil,eliminating the benefits of the structural layers leading to rapid pavement damage. ALYAF has launched a new generation of geocomposite capillary break layers that replace the traditional open graded aggregate layers and the geotextile filters.
over Saturated Subgrades
Design of pavements in hot and arid climates need to address the problem of capillary rise of ground water. In this environment, moisture rises up into the base course through capillary function leading to saturation of the base courses. Saturation of the base course changes the dynamics of vertical stress distribution, and may allow transfer of traffic loads directly to subgrade soil,eliminating the benefits of the structural layers leading to rapid pavement damage. ALYAF has launched a new generation of geocomposite capillary break layers that replace the traditional open graded aggregate layers and the geotextile filters.
over Sabkha Soils
Embankments constructed over Sabkha terrains suffer different classes of deterioration due to the low load-bearing capacity of these soils especially when wet. Sabkha soils are well known for their extremely low strength. In addition, there are two other concerns when dealing with sabkha soils. Firstly the concentrated nature of the sabkha brines which is often four to six times that of a sea water from the same vicinity, which can be drawn into the structural layers of the pavement by capillary action and can recrystallize therein, causing expansion and blistering at the surface. Secondly, the acute water sensitivity of sabkha characterized by a complete loss of strength. ALYAF has pioneered techno-commercially viable geosynthetics solutions for stabilizing sabkha soil. While ALYAF recommends a site-specific design; a typical solution includes the following component.
over Sabkha Soils
Embankments constructed over Sabkha terrains suffer different classes of deterioration due to the low load-bearing capacity of these soils especially when wet. Sabkha soils are well known for their extremely low strength. In addition, there are two other concerns when dealing with sabkha soils. Firstly the concentrated nature of the sabkha brines which is often four to six times that of a sea water from the same vicinity, which can be drawn into the structural layers of the pavement by capillary action and can recrystallize therein, causing expansion and blistering at the surface. Secondly, the acute water sensitivity of sabkha characterized by a complete loss of strength. ALYAF has pioneered techno-commercially viable geosynthetics solutions for stabilizing sabkha soil. While ALYAF recommends a site-specific design; a typical solution includes the following component.
ALYAF SALT BARRIER
Orbital Highway Project at Qatar
ALFGRID geocomposite
A single product to provide the critical multifunction of separation, filtration and reinforcement.
Layer of Design
Well graded aggregate layer of designed thickness as working platform
SALT BARRIER
Geocomposite capillary break layer to prevent the rise of the saline ground water into the structural layers.
ALYAF SALT BARRIER
Orbital Highway Project at Qatar