ReCon Retaining Wall Unit: Concrete, segmental facing block provided by an authorized manufacturer under license to ReCon Retaining Wall Systems, Inc.
Geogrid: A geosynthetic material manufactured of high tensile materials specifically for the purpose of reinforcing and creating a structural soil mass.
Drainage Aggregate: Clean, crushed rock located within and immediately behind ReCon units to facilitate drainage and avoid compaction in close proximity to ReCon wall units.
Reinforced Backfill: Soil zone extending from the Drainage aggregate zone to the back of the embedded geogrid.
Foundation Soil: Soil zone immediately beneath the retaining wall facing units, the wall leveling pad and the reinforced soil zone.
Retained Soil: Soil immediately behind retaining wall facing and drainage aggregate or reinforced backfill if present.
Construction Drawings: Approved final plan for construction prepared and stamped by the wall design engineer licensed to practice in the state where the retaining wall is located.
Contractor shall submit Manufacturer’s product data and installation instructions for approval.
Contractor shall submit Manufacturer’s test reports certifying that the ReCon units manufactured at their production facility meet the requirements of this specification and the requirements of the Construction Drawings.
Unless provided within these project documents and/or the project drawings, contractor shall submit two sets of the Construction Drawings for all ReCon retaining walls on the project.
The design must be prepared by a Professional Engineer licensed to practice in the state where the retaining wall is located.
The design shall be per NCMA Design Guidelines for Segmental Retaining Walls, or the AASHTO Standard Specifications for Highway Bridges, whichever is applicable as determined by the retaining wall design engineer.
Construction Drawings shall include:
The retaining wall layout and retaining wall heights.
Proper placement, lengths and types of geogrid reinforcement where necessary.
Typical wall sections.
Types, locations and properties of all drainage materials, appurtenances and special installation requirements not covered in this specification.
Retaining wall elevation views.
Any soils reports or testing conducted in addition to that included within the project drawings and specifications.
If geogrid reinforcement is required in the final engineered construction drawings, submit manufacturer's product literature, product testing reports and a twelve by twelve inch or larger sample of each type to be used in wall construction.
Testing reports shall include:
Connection strength data for each combination of ReCon segmental unit and geogrid used as determined by NCMA SRWU-1.
Long-term design strength as determined by GG4-91.
Geogrid soil pullout as determined by ASTM D-6706.
Submit gradation reports for aggregates used for the wall leveling pad, unit / drainage fill and for select reinforced fill if required in the final engineered wall design.
All submittals must be provided and reviewed prior to the start of retaining wall construction.
DELIVERY, STORAGE, AND HANDLING
Contractor shall inspect all products at delivery to determine that the proper materials have been delivered and are useable. Damaged material shall not be incorporated into the work.
ReCon retaining wall units shall be stored in a location and manner that protects against excessive weathering and damage.
Contractor shall prevent ReCon units from excessive soiling and coming in contact with substances which may stain or adhere to the finished visual surfaces of the unit.
Faces of the ReCon shall be free of excessive chipping, cracking and stains.
Installer Qualifications: Contractor shall have successfully installed at least three projects similar to that of this project within the last two years. Contractor shall maintain at least one mechanic on site at all times that worked on one or more of these previous installations.
Owner shall employ the services of an independent geotechnical or materials engineering firm to provide soil testing and quality assurance inspection for wall construction and soils work. Contractor shall provide any quality control testing or inspection not provided by the Owner.