1706 – ABUTMENT STRIP DRAIN 1700-11
1706.1 Description
The abutment strip drain is a prefabricated geocomposite system used to provide drainage behind abutment backwalls, wing walls, retaining walls or under slopes.
1706.2 Requirements
a. General. The system is preformed using a lightweight, high impact polymeric core with an attached geotextile (filter fabric). The composite polymer core is bonded to the geotextile at intervals not exceeding 1 1/8 inch in any direction. The preformed system permits the flow of water through the core. The geotextile fabric is thermal (heat) bonded or fungicide glue bonded to the polymeric core. The composite product sheets or rolls have a minimum width of 3 feet with a minimum area of 40 square feet. Store and handle the system in accordance with manufacturer's recommendations, except that in no case may geotextile be exposed to direct sunlight, ultraviolet rays, temperature greater than 140ºF, mud, dirt, dust, and debris. Do not use any core section that becomes torn or punctured. All material delivered to the project must meet or exceed the physical requirements based on minimum average roll or sheet values in TABLE 1706-1. TABLE 1706-1: COMPOSITE SYSTEM PROPERTIES Property Requirement Test Method Thickness (mils) 250 min., 500 max ASTM D 1777 Peel Strength (lbs/ft) 5 minimum ASTM D 1876 Transmissivity at hydraulic gradient of 1.0 and normal stress of 3,600 lbs / sq ft Wall Drain (gals/min/ft) 7 minimum ASTM D 4716 Slope Drain (gals/min/ft) 10 minimum ASTM D 4716 b. Core . The core is a lightweight polymer plastic co mposition of either poly styrene, polyethylene, polypropylene, or PVC, with a convexity structure and complies with TABLE 1706-2. TABLE 1706-2: CORE PROPERTIES Property Requirement Test Method Std. Crush Strength: Wall Drain (lbs/sq ft) Min. 8,000 ASTM D 1621 Slope Drain (lbs/sq ft) Min. 17,000 ASTM D 1621 Deflections (%) Max. 20 ASTM D 1621 Thickness (mils) Min. 230 ASTM D 1777 c. Geotextile Filter Fabric . Provide fabric that complies with AASHTO M 288 for subsurface drainage geotextiles with properties for Class 2 geotextile with elonga tion greater than or equal to 50%, and percent in-situ soil passing the No. 200 sieve of greater than 50%. NOTE: Use backfill soils with a liquid limit less than 50.
1706.3 Test Methods
Test the composite and individual components according to the standards cited in subsection 1706.2. 1706 – ABUTMENT STRIP DRAIN 1700-12
1706.4 Prequalification
For prequalification, supply samples of the finished product from production to the KDOT Engineer of Tests for testing and evaluation. Submit separate samples of the core material and the filter fabric. All samples must be 10 feet long by nominal roll width. Submit a manufacturer’s or independent laboratory test report addressing the properties in subsection 1706.2. When it becomes available, test results for th e product will be accepted from the AASHTO National Transportation Product Evaluation Program (NTPEP) without submitting samples. Forward an official copy of the test report to the Bureau Chief of Construction and Mate rials for evaluation. Prequalification will be based on satisfactory compliance of NTPEP results with this specification. If the KDOT test or NTPEP results comply with subsection 1706.2, the name of the product will be placed on a list of prequalified products maintained by the Bureau of Construction and Materials. No geocomposite drainage system will be used on KDOT projects unless it has been prequalified.
1706.5 Basis of Acceptance
Prequalification as specified in subsection 1706.4. Receipt and approval of a Type C certification as specified in DIVISION 2600. A visual inspection in the field for damage an d to verify compliance with these specifications.
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