Please see the chart to the right for assistance with selecting the most appropriate geotextile fabric which meets certain specific testing specifications. Additional information and pricing for each fabric can be found below.
Case Studies Featuring AASHTO M288 Geotextiles
Mirafi 160N Case Study
Application: Filtration, Drainage, & Vegetation Location: Fort Bliss, El Paso, TX Product: Mirafi® 160N
TenCate® produces materials designed to improve performance, bring down costs, and deliver excellent results to customers looking for landscaping solutions.
Installing Mirafi 160N
Ford Bliss is situated in the very arid region of El Paso, Texas. Landscape architects have spent decades working to develop sustainable growth of vegetation in difficult areas like this.
The U.S. Military's approach to the expansion of the Fort Bliss military base led to new challenges for the growth of vegetation. The new construction of military housing and the overall growth of the base have created enormous areas of land needing landscaping. The landscape architects realized the least expensive and pleasing appearance would be covering the areas with different kinds of crushed rock but would lead to high maintenance and long-term issues in preventing the growth of weeds.
TenCate Mirafi® 160N is a nonwoven geotextile chosen for use under crushed rocks.
The architects knew using crushed rock would inhibit the growth of vegetation throughout these rocks. Many years earlier, the application of a thin sheet of impermeable polyethylene was the answer. The liner worked to prevent vegetation from growing through the rock but when it rained, the product would collect water. At times, the water along with gravity would cause the crushed rock to move downhill creating maintenance issues. The architects concluded they had to use an absorbent product that would be strong and thick enough to prevent vegetation from growing but not create other issues including continual maintenance. They decided to go with the moderate-weight 5 oz nonwoven permeable geosynthetic Mirafi® 160N.
The construction of the area was simple enough. The subgrade had to be leveled then Mirafi® 160N was applied over the subgrade, overlapping by 2 inches at the geosynthetic's adjacent panels. The crushed rock was evenly spread across the Mirafi® 160N by 3 inches and then slightly compacted.
When the project was completed, it was a huge success. Mirafi® 160N was installed over millions of square yards over a period of 10 years. The architects in El Paso have continued to stand by Mirafi® 160N for the Fort Bliss project as well as other metropolitan projects in El Paso.
Mirafi FW700 Case Study
Application: Drainage and Filtration Location: Thermal, CA Product: Mirafi ® FW700
TenCate® has created materials that increase overall performance, reducing costs, and providing excellent results for their customers looking for solutions.
Mirafi FW700 at Jobsite
The City of Thermal, California was in dire need of water and sewer advancements. Coachella Valley was looking for geotextile material that was durable while providing a controlled flow rate. They needed the new sewer system to last a very long time so using the right material was extremely important.
TenCate Mirafi ® FW700 geotextile was selected by the Coachella Valley Engineering Department for this project. Mirafi ® FW700 is extremely durable and its water flow rate is 18 gal/min/ft2. The durability and flow rate offered by Mirafi ® FW700 seemed like the ideal choice. The engineer chose this woven geotextile and was positive it would give them the required amount of flow required for this project. Not only would it offer the needed durability but would last for many years. The components were very important by offering good drainage for this project.
The contractor dug up the old sewer pipes and installed sheer walls for protection while they were working. They used a pipe rail device then over that, they slid the roll cores. The product was brought down and a layer of Mirafi® FW700 was placed at the bottom of the trench on the subgrade.
The contractor filled 8 inches of ¼ inches of crushed aggregate on top of the geotextile. The new sewer pipe was lowered into the trench on top of the Mirafi® FW700 along with ¾ inch of crushed rock. After securing the pipes, ¾ inch of crushed aggregate was placed on top of the pipe (8 inches) and then filled the trench. The Mirafi® FW700 was then cut and wrapped around the remaining fragments and particles creating an unbroken layer between the soil up above and the fragments and particles down below. This gave the raised platform what was needed for drainage and filtration needed.
TenCate Mirafi® FW700 provided strength, drainage, and filtration to the city of Thermal's water and sewage improvements.
Mirafi® FW700 's strength guaranteed the ¾ inch aggregate would remain in place.
The 18 gal/min/ft2 flow provided good filtration and drainage.
Mirafi® FW700 separated the soil and the ¾ inch aggregate properly.
The final results for the water and sewer project showed it will last for many years while giving the City of Thermal improved water and sewer services.
TenCateTM offers materials that will improve performance, reduce costs, and give customers excellent solutions for their projects.
Rolling Out FW700 at Beach Project
The Department of Conservation and Recreation in the Commonwealth of Massachusetts, awarded a $20 million, 3-year contract to Phl Inc for the Rehabilitation Project in Nahant, Massachusetts as of June 2010.
One of the leading issues of the project was the reconstruction of the old armored revetment system that served to protect the 1,5-mile causeway and beachfront parking areas.
The new revetment design would include 3 different armor stone configurations. The plan was to remove the current revetment and build up the sloping subgrade areas to the design elevations.
TenCate Mirafi ® FW700 was the product chosen for the Geotextile Filter Fabric to wrap the 6 to 12-inch layer of 3/4” crushed stone bedding beneath the armor stone. The 1.5-mile revetment included sections of reinforcement concrete seawall behind the heavy armor stone facing.
The combination of Mirafi ® FW700 geotextile wrapped bedding stone, along with heavy armor stone, and the concrete seawall was created to stop erosion of the subgrade from tidal waves and lessen the impact of increased waves during severe storms.
Construction of the new revetment started in the fall of 2010 by removing the old revetment and reshaping the subgrade slope in order to replace the bottom layer of woven geotextile filter fabric. Mirafi ® FW700 was chosen because of its excellent filtration, drainage, and strength. The thickness of the crushed stone bedding was placed on Mirafi ® FW700 then the top layer of Mirafi ® FW700 was wrapped. The armor stone ranged from 3.2 tons down to 250 lbs each then placed on Mirafi ® FW700 in layers from 2.3 feet to 7 feet in thickness depending on the configuration of the revetment. The construction ran from 2010 to its completion in August 2011.
The remaining work of the Nahant Beach restoration project was scheduled to be completed in 2013.
The contractor's general manager said that Mirafi ® FW700 wrapped stone bedding layers were the most important part of the revetment design because they allowed for both filtration and exfiltration of seawater from behind and under the armoring stone to prevent erosion of the subgrade. This was the reason why the original revetment was washed away. The reconstruction of the revetment system is currently protecting the Nahant Beach causeway and is operating as planned.
Headquartered in Pendergrass, Georgia, TenCate Geosynthetics offers commercial and technical services. They have two divisions, TenCate Geosynthetics and TenCate Industrial Fabrics.
Through synthetic processing, they have produced reliable textiles that improve the performance of many products. For the best results for drainage and filtration issues, TenCate has the answer: