249—FLOWABLE BACKFILL

249.01 Description

These specifications cover materials, design criteria, and mixing and testing procedures for flowable backfill used in applications where modified liquid or plastic concrete is required for backfilling pipe installations and plugging abandoned pipe lines, culverts, and conduits.

249.02 Materials

249.03 Mix Design

The Contractor shall provide the appropriate mix design for the flowable backfill application. Flowable backfill shall have a design compressive strength of 30 to 200 pounds per square inch when used as back - fill material in pipe installations or in other uses at locations as designated on the plans. Flowable backfill shall have a design compressive strength of 30 to 1200 pounds per square inch when used as backfill material for plugging pipes and culverts designated for abandonment as shown on the plans. The design compressive strength requirement shall be at 28 days when tested in accordance with ASTM D 4832. Mix design shall result in a fluid product having no less than an 8-inch slump at the time of placement. The Contractor shall submit a mix design verifying compliance with 28 day compressive strength requirements supported by laboratory test data to the Engineer for review. The Contractor must have the Engineer’ s acceptance of the Contractor’ s mix design and test data prior to placement of the flowable backfill. SECTION 250 - CARBON FIBER MESH

250.01 Description

These specifications cover carbon fiber mesh used along with EP-7 epoxy to seal joints in between box beam bridges and other bridge joints.250.01