31_05_19_Geosynthetics_for_Earthworks-Rev20161103.pdf

U.S. General Services Adminstration Mid-Atlantic Region

Public Buildings Service

SECTION 31 05 19

GEOSYNTHETICS

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PART 1 – GENERAL

1.01 SECTION INCLUDES:

A. Summary B. Law and Regulations C. Safety D. References E. Submittals F. Delivery, Storage, and Handling G. Geotextile H. Geotextile Placement

1.02 SUMMARY:

A. The work under this Section includes the furnishing of all labor, equipment and materials, and performing all operations in connection with the installation of geosynthetic materials as shown on the Drawings and as specified herein.

B. Geosynthetic materials include non-woven Geotextile fabric used for separation, filter, and structural support.

C. Geotextile will be used for the following design features:

1. Haul Roads

2. AOC 15 Consolidation Area Drainage Structures

3. Drainage Swales

4. Constructed Wetlands

1.03 LAWS AND REGULATIONS:

A. All work under this Contract shall be accomplished in accordance with regulations of local, county, State and Federal agencies and utility authority standards as they apply.

1.04 SAFETY:

A. Methods of operation utilized in work related to these specifications shall be such as to provide maximum protection against injury or death to workmen or the public.

Requirements of the United States and New Jersey Occupational Safety and Health Acts as to safety regulations and procedures shall be adhered to for all work covered under these specifications.

1.05 REFERENCES:

A. AASHTO M288 – Geotextile Specification for Highway Applications.

Public Buildings Service

SECTION 31 05 19

GEOSYNTHETICS

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B. STM D3786 – Hydraulic Bursting Strength of Knitted Goods and Non-Woven Fabrics:

Diaphragm Bursting Strength Tester Method.

C. ASTM D 4491 – Water Permeability of Geotextiles by Permittivity.

D. ASTM D4533 – Standard Test Method for Trapezoid Tearing Strength of Geotextiles.

E. ASTM D4632 – Standard Test Method for Grab Breaking Load and Elongation of Geotextiles.

F. ASTM D4751 – Determining the Apparent Opening Size of a Geotextile.

G. ASTM D4833 – Standard Test Method for Index Puncture Resistance of Geotextiles, Geomembranes, and Related Products.

H. ASTM D4873 – Standard Guide for Identification, Storage, and Handling of Geosynthetic Rolls and Samples.

I. ASTM D5199 – Standard Test Method for Measuring the Nominal Thickness of Geosynthetics.

J. ASTM D5261 – Test Method for Measuring Mass per Unit Area of Geotextiles.

1.06 SUBMITTALS:

A. Contractor shall submit to the Engineer for review and approval the following documentation on Geosynthetic production:

1. Certificate shall include:

a. Roll numbers and identification;

b. Sampling procedures; and

c. Results of quality control tests, including descriptions of the test methods used (the Manufacturer’s quality control tests to be performed are given in Part 2 of this Section).

2. Manufacturer’s recommended material handling and storage procedures.

3. Manufacturer’s product information including the physical properties as listed in this Section.

4. Manufacturer’s warranty as specified in this Part.

B. Contractor shall submit for review and approval the following information:

1. Installation warranty as specified in this Part.

C. Contractor shall submit the following upon Geosynthetic installation completion:

Public Buildings Service

SECTION 31 05 19

GEOSYNTHETICS

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1. Installer’s Certification that material installation is complete and in accordance with the Construction Drawings.

2. Manufacturer’s material warranty and Installer’s installation warranty.

3. CQA documentation for material installation.

1.07 DELIVERY, STORAGE, AND HANDLING:

A. Mark or tag rolls with: manufacturer's name, product identification, lot number, roll number, and roll dimensions.

B. Handle and store the rolls in accordance with ASTM D4873 and as recommended by the manufacturer.

PART 2 PRODUCTS

2.01 GEOTEXTILE:

A. Geotextile Usage:

1. Haul Roads

2. AOC 15 Consolidation Area Drainage Structures.

3. Drainage Swales

4. Constructed Wetlands

B. The Geotextile shall be a non-woven, needle-punched filament made of 100% polypropylene. The Geotextile shall be inert to biological degradation and naturally encountered chemicals, alkalines, and acids. The material shall meet the requirements of Standard Specification for Geotextile Specification for Highway Applications (AASHTO Designation: M 288) for a Class I fabric for subsurface drainage. The material shall conform to the following minimum average roll values (weakest principal direction) requirements (unless specified otherwise).

C. The Geotextile shall be free of metal.

D. Geotextile properties:

1. Contractor shall furnish Geotextile having properties that comply with the minimum required values shown below in Table 02 070 00-2.

Public Buildings Service

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GEOSYNTHETICS

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TABLE 020 70 00-2

REQUIRED GEOTEXTILE PROPERTIES

Property Unit Test Method Requirement

California Bearing Ratio lbs. ASTM D6241 650

Permittivity sec-1 ASTM D4491 1.2 min.

Trapezoidal Tear Strength lbs. ASTM D4533 95

Grab Elongation Percent ASTM D4632 >/=50

Grab Tensile Strength lbs. ASTM D4632 230

AOS U.S. Sieve No. ASTM D4751 100 max.

Puncture Resistance lbs. ASTM D4833 120

Weight oz./yd2 ASTM D5261 8.0

PART 3 EXECUTION

3.01 GEOTEXTILE PLACEMENT:

A. Subgrade Preparation:

1. Surfaces to receive Geotextile shall be smooth and compact, free of litter, sharp protrusions (exceeding 1 inch from the ground surface), and large stones.

B. Installation:

1. The Geotextile shall be placed on the prepared subgrade at the locations and to the dimensions shown on the Drawings and as specified in this Section. The Installer shall provide and maintain the necessary means for controlling water.

2. The Installer shall roll the Geotextile out as smoothly as possible and not drag the Geotextile across the subgrade. The Geotextile shall be placed loosely but without wrinkles and creases which shall be removed by stretching manually as required.

3. The Geotextile installation should be conducted using procedures which prevent damage to underlying materials.

4. The Geotextile shall be weighted with sandbags (or an Engineer approved equivalent) during deployment in a manner which prevents wind damage. The weights shall remain in place until the Geotextile is covered.

5. The Geotextile shall be protected at all times during construction against contamination with mud or dirt, damage and ultraviolet light (sunlight). The Geotextile shall not be exposed to sunlight for more than two (2) days prior to placement of cover material. Geotextile material contaminated with runoff or sediment shall be completely removed and replaced with new, clean material at the expense of the Installer.

Public Buildings Service

SECTION 31 05 19

GEOSYNTHETICS

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6. Should the installation items as described in this Section contradict those of the Manufacturer as specified in the submittal, the Installer shall seek clarification from the Engineer.

C. Seaming Procedure:

1. Seaming shall be placed with a minimum of a six (126) inch overlap.

2. Unseamed joints to be approved by CM must have a minimum overlap of 18-inches.

2.3. When overlapping Geotextile, the upstream sheet shall be placed over the downstream sheet.

D. Cover Aggregate Placement:

1. The cover materials shall be placed carefully to avoid damage and/or displacement of the geosynthetic materials. The material shall not be dumped onto the surface of the geosynthetics, but rather carefully placed and spread using low impact, wide-track dozers.

2. Contractor shall fill beginning with the sheets overlapped above subsequent sheets to avoid displacement of material.

3. Tire-mounted trucks and end-dumped material shall be kept off geosynthetics until twelve (12) inches of cover material has been placed.

C. Repairs:

1. If any defect is observed, such defect shall be repaired by replacing the damaged fabric or by placing a new layer of Geotextile extending a minimum of three (3) feet beyond the defect in all directions.

END OF SECTION