Geosynthetic Reinforced Construction Platforms Cost Information
<p><p><h2>Commentary</h2>Typical contract pay items and units of measurement used for geosynthetic reinforced construction platforms include:<br><ul> <li>Geosynthetic (fabric or grid) measured by the square yard in-place</li> <li>Granular material measured by the ton</li> <li>Embankment measured by the cubic yard</li></ul>The equipment used to construct geosynthetic-reinforced construction platforms is common to highway construction projects; therefore, additional mobilization costs are negligible.<br><
Geosynthetic Reinforced Construction Platforms Fact Sheet
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Geosynthetic Reinforced Construction Platforms Specifications
Summary of Example Specifications
<p><p><h2>Summary of Example Specifications</h2><div class="grayed-title subsection"><strong>Specification Name/Number:</strong> Kansas DOT Specification</div><strong>Reference(s):<br></strong><em>KDOT (2007)</em></p><p>The Kansas DOT provides this specification for geosynthetics used for subgrade stabilization and it includes general requirements (composition of geosynthetics and types of seam used for joining two pieces of geosynthetics), strength properties of geotextile, geogrid and geotextile/geogrid combinations, test methods, prequalification, and basis of acceptance. The specification is classified as method approach specification since it provides information regarding different ASTM test methods and some information regarding the properties, proportions, and composition of geosynthetics.<br>The specification does not provide information regarding site conditions, minimum contractor qualifications, or design. However, the information provided is easy to read, logically ordered, and provides clear instructions for completing the work. There are no conflicting statements. The responsibilities of the contractor and the owner are not clearly described. Hence, the risk is inappropriately allocated to the owner. The specification requirements favor certain contractors or products. Contractors may find it difficult to create realistic bids because some information, like minimum contractor qualifications, maintenance, measurements, payments etc., is lacking. The specification does not include anything regarding construction requirements.</p></p>
Laboratory Test
<p><p><strong>Reference(s):</strong></p><p><em>Kim et al. (2005)</em></p><p><strong>Method Summary</strong></p><p>The study was conducted to quantify and evaluate the structural contribution of reinforced granular working platforms used for constructing highway pavements over soft subgrade using Large-Scale Model Tests (LSME). The effect of geosynthetics was expressed in terms of the reinforcement factor.
Material Properties Verification
<p><p><strong>Reference(s):</strong></p><p><em>Geosynthetic Design and Construction Guidelines (Holtz et al. 2008)</em></p><p><strong>Method Summary</strong></p><p>The geosynthetic must survive the construction operations and must have the required properties to perform its intended function. Enough cover should be provided to prevent it from being damaged.
Material Properties Verification
<p><p><strong>Reference(s):</strong></p><p><em>KDOT (2007)</em></p><p><strong>Method Summary</strong></p><p>Several DOTs has provided specification for material properties verification and KDOT (2007) specification is described here. Material specification must be prequalified through the Engineer of Tests, Materials and Research Center, 2300 SW Van Buren Street, Topeka, KS 66611-1195.
Stress Distribution Approach
<p><p><strong>Current FHWA Reference(s):<br></strong><em>Holtz et al. (2008)</em><strong>Supporting Reference(s):<br></strong><em>Giroud and Noiray (1981)<br>Giroud and Han (2004a, b)</em></p><p>This method calculates the required construction platform aggregate thickness for an unreinforced and a reinforced unpaved road.
Temporary Access Road, Irwin Lake, Monroe, Louisiana
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