Specification for Geofill LD Low Density Cellular Concrete (Non-Pervious) For Filling Abandoned Pipes & Structures

I – SCOPE OF WORK

This work consists of providing Geofill LD, a non-pervious, low density cellular concrete to fill abandoned pipes or other structures at the location shown in the plans in accordance with plan details and these specifications.

II – MATERIALS

• Fly ash shall be Class C or Class F and compatible with foaming agent.
• Water shall be free from deleterious substances.
• Foaming agent shall be Geofill Concentrate by MixOnSite, LLC (#800-559-3511) or Geofoam by Cellular Concrete LLC (#610-398-1833) conforming to ASTM C796.
• Admixtures for water reducing, retarding, accelerating, and other specific properties may be used when recommended by the manufacturer of the foaming agent.
• Geofill LD shall have the following properties:
  • Range of Cast Density, PCF 24 - 30
  • Minimum Compressive Strength (28 Days), PSI 40
  • Flow Consistency per ASTM D6107 Greater than 7”

III – SUBMITTALS

• Mix design for Geofill LD, including materials to be used and the sources.
• Resume of contractor showing qualifications as specified below, including qualifications of contractor’s superintendent and/or foreman.
• Description of equipment and placement methods to verify compliance with specifications.

IV - PRODUCTION

• Foam generating equipment shall be used to produce a predetermined quantity of pre-formed foam which shall be mixed and blended with cementitious slurry. Equipment shall be calibrated to produce a consistent foam with stable, uniform cellular structure.
• Geofill LD shall be produced utilizing specialized automated proportioning, mixing, and foam producing equipment, which is capable of meeting the specified properties.
• Avoid excessive handling of the material. After sufficient mixing of the foam with slurry, the material shall be conveyed promptly in its final location. Concrete piston pumps may be used to place finished Geofill LD.

V – INSTALLATION

• All bulkheads and injection points installed shall be capable of withstanding a minimum of 30 PSI or the allowable maximum pressure, whichever is greater and shall be water tight.
• Injection ports and pipes must be securely installed and be able to receive a minimum 2” male threaded NPT.
• Space injection points at intervals to allow adequate inspection ports so material may be forced from one injection point to the next at pressures below maximum allowable pressure.
• All water and other residual materials must be removed from pipe prior to initiating filling procedure. If required, de-watering shall be continuous during installation of cellular concrete.

VI – QUALITY CONTROL AND QUALITY ASSURANCE

Contractor shall have a record of experience and quality of work placing Geofill LD that is satisfactory to the Engineer including the following:

• Shall be capable of developing a mix design, batching, mixing, handling, and placing this material.
• Shall be regularly engaged in the production and pumping of materials for filling abandoned pipes or other structures.
• Shall have satisfactory completed during the last twelve (12) months at least five (5) similar projects.
• Workers including the contractor’s superintendent and/or foreman, shall be fully qualified to perform the work and have had previous experience under similar conditions.

Testing

• A minimum of four (4) 3”x 6” cylinders shall be molded for each shift of operation.
• Geofill LD may be tested at any age after three (3) days for compressive strength. At least two (2) specimens from each set should be tested at 28 days in accordance with ASTM C-495.
• Contractor shall record and measure wet cast densities at the point of placement regularly. Mix shall be adjusted as required to obtain the specified cast density at the point of placement.
• Contractor shall record and measure flow consistency regularly in accordance with ASTM D6107.

VII – MEASURMENT AND PAYMENT

• A. Geofill LD shall be paid for at the contract unit price per cubic yard for materials produced.

Geofill LD Abandonment Specs

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