The Objective - With the continual growth in Manchester, New Hampshire area which is near the greater Boston area, the Manchester Boston Regional Airport took on the expansion that included facility upgrades. The upgrades also included a runway expansion.
Segmental Retaining Wall - TenCate is a manufacturer that develops and generates materials for greater performance, and a reduction in cost, while delivering exceptional results by working with their customers to offer the best products.
The Design - Held back by the current airport entrance roadway, it was decided to create a segmental retaining wall using Keystone Compac and Miragrid® XT geogrids to increase the length of the available runway. A unanimous agreement declared the wall must be structurally sound and aesthetically appealing.
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The Construction - During the construction phase of the project, it was determined the retaining wall had to be 28 feet high. A section of one wall had 2 14-feet tiered retaining walls that blended into a third wall. All three of these walls merged at the end of the span to form a structure with approximately 100,000 square feet of frontage.
Performance - The Keystone Compac walls implementing Miragrid® XT geogridsprovided a structural portion of the retaining wall (SRW) that blended with the existing walls. The combination offered an excellent alternative to conventional poured-on concrete walls.
The Objective - San Antonio, Texas has been called home to Tesoro Corporation since . Since then, the current facility has become too small for their operations so Tesoro decided to relocate their headquarters to the intersection of U.S. Highway 281 and Redland Road, just north of Loop at Ridgewood Park.
Geogrid Reinforcement For MSE Wall - TenCateTM is a manufacturer that develops and produces materials for greater performance, a reduction in cost, while delivering exceptional results by working with their customers to offer excellent solutions. The new property is owned by Patrinely Group, LLC and constructed on 122 acres along with a 618,000 sq. ft leasing office. San Antonio's landscape consists of rolling hills and steep cliffs with exposed limestone. The location for the headquarters, Ridgewood Park, offers the same post-card appeal.
The Objective - Approximately 300,000 cubic yards of mass grading was necessary for the building's location and two engineered bridges were required for access to the site. The developer needed access to the site from the south off of Sonterra Boulevard. The problem, the access road would be a 75-foot elevation difference from the top of the street down to the existing grades on the property. Also, there is a limited amount of space in that area so constructing a steepened slope would be out of the question and the retaining wall was necessary on the east side of the access road. More explicitly, a Keystone-engineered wall system using Miragrid® geogrid was the most economical and architecturally attractive alternative.
The Design - The engineers working on the project brought in the owner to decide which MSE wall should be used to meet their goals for an aesthetically appealing structure that would be able to handle the loading conditions of the access road. Finally, the Keystone wall system was chosen not just for its aesthetic appeal, but the wall's height-to-depth ratio delivered the engineers' structurally sound wall system with outstanding stability, durability, and strength.
Geogrids are a critical reinforcing component in the Keystone wall system. Miragrid® 3XT, 5XT, and 8XT geogrids were designed into the system due to their high long-term and creep-reduced design strengths along with the compatibility of the connection features of the Miragrid® products to the Keystone wall blocks.
Miragrid® geogrids used in the Keystone wall system provided an adorned wall design by creating a considerable amount of soil behind the wall. Using Miragrid® products in the wall system, created the needed internal stability causing less pressure from the soil on the back of the soil blocks which in turn decreased bulging and other stability issues.
Construction - The landscape of the site came with several challenges for constructing the wall system and the access road. Due to extreme changes to the elevation, the Keystone-engineered wall system was designed and created into a three-tiered system with the tallest part rising to 43 feet.
Constructing the foundation of the wall system required compacting a TXDOT aggregate to a level grade.
The contractor installed Miragrid® 3XT, 5XT, and 8XT at the calculated elevations in order to reinforce the soil structure. Due to Miragrid® XT geogrids’ excellent flexibility, the contractor could maneuver and connect the geogrid between the individual Keystone blocks making it easier than using a stiffer reinforcement geogrid.
Performance - The final outcome of the project was a total success. The contractor was able to complete the Keystone wall system on time. The entire system reached the developer's goal of an aesthetically appealing system which offered a solution to constructing a critical access road into the property. All those involved with the design, construction, and the end results of the wall were totally satisfied.
The Objective - The owner of a shopping mall in Roanoke, VA needed a parking area for the new Home Depot®, Chick-fil-A®, and other businesses while keeping the existing road that services the area above the site. There were several significant grade problems that would require special construction procedures to keep construction down in the cut areas behind the wall.
The Design - To keep down excavation, the crew decided to use a soil nail design in the most prominent cut areas. The design included soil nails drilled into the slope and the geogrid attached to the header beam. In the balance of the site where they had fills or minimum excavation, standard SRW geogrid designing was used. The wall behind the Home Depot®is a Century Wall by Keystone offering multi-colors while the wall at Chick-fil-A® is the Compac 2 design.
Construction - A drill attachment on a small track hoe was used to drill holes into the existing grade. Mechanical soil nails were inserted into the holes. A header pipe was connected to the set of nails and the correct strength of Miragrid® geogrid was wrapped around the pipe and attached to the wall face. After the soil's nail section of the wall was finished, the balance of the SRW walls on both sides of the roadway, in the fill area, were brought up simultaneously.
HDPE Uniaxial Geogrid vs.HDPP Uniaxial Geogrid
Plastic uniaxial geogrids play a crucial role in modern geotechnical engineering, renowned for their efficiency in soil reinforcement and load distribution. HDPE (High-Density Polyethylene) uniaxial geogrids and HDPP (High-Density Polypropylene) uniaxial geogrids are the two most commonly used types in the market. This article provides a detailed comparison of their performance, applications, and considerations for international procurement, helping buyers make informed decisions.
Plastic uniaxial geogrids are mesh-like structures made from polymer materials, designed to exhibit high tensile strength in a single direction through a specialized stretching process. Their unique characteristics make them suitable for:
Soil reinforcement: Enhancing the stability of foundations and preventing settlement.
Slope stabilization: Reducing the risk of landslides and controlling soil erosion.
Retaining wall support: Improving wall stability and extending service life.
Landfill reinforcement: Providing structural support for liner and cover systems.
HDPE uniaxial geogrids are produced by extrusion, perforation, and unidirectional stretching. This process aligns the molecular chains of polyethylene along the stretching direction, resulting in superior tensile properties.
Exceptional Tensile Strength: Provides excellent load-bearing capacity in the primary direction, ideal for long-term stability.
Chemical and Durability Resistance: Highly resistant to acids, alkalis, and various environmental factors.
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Resistance to Environmental Stress Cracking: Maintains stability under prolonged loads and external stress.
UV Protection: Designed for outdoor installations with a lifespan extending several decades.
Roads and Railways: Reinforcing soft subgrades to reduce deformation and settlement.
Retaining Walls and Reinforced Slopes: Supporting soil structures and improving stability.
Dams and Channels: Controlling soil and water erosion while enhancing foundation stability.
HDPP uniaxial geogrids are manufactured using high-density polypropylene through extrusion, perforation, and stretching processes similar to HDPE. However, the different molecular structure of polypropylene leads to distinct tensile properties and application scenarios.
Higher Impact Resistance: Suitable for dynamic load conditions, such as ports and airports.
Excellent Chemical Resistance: Particularly effective in environments with highly corrosive substances, such as landfills.
Superior Flexibility: More adaptable to complex terrains compared to HDPE.
Lightweight Design: Easier to transport and allows for faster installation.
Landfills: Reinforcing liners and cover systems for additional protection.
Bridge Abutments and Slopes: Ideal for conditions requiring impact resistance and adaptability.
Ports and Airport Runways: Providing reliable support in areas with repeated heavy loads.
Both geogrids are supplied in roll form. However, HDPP geogrids are more compact due to their flexibility, potentially reducing shipping costs in some cases.
For environments exposed to prolonged sunlight or corrosive substances, buyers should prioritize products with superior UV and chemical resistance.
For static loads or projects requiring long-term reinforcement, HDPE geogrids are more cost-effective.
For dynamic loads or projects involving complex environments, HDPP geogrids are the better choice.
HDPE and HDPP uniaxial geogrids both excel in soil reinforcement and load distribution, yet their differences make them suited to distinct applications. Buyers should select the product that aligns with their project’s specific needs and budget. HDPE geogrids are more cost-effective for static and long-term applications, while HDPP geogrids offer superior performance under dynamic loads and challenging conditions.
Partnering with reputable suppliers ensures access to high-quality products, detailed specifications, and technical support, helping buyers achieve stability, longevity, and cost efficiency in their projects.
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