• NCDOT Geotech Alerts

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Summary of Changes
SP04 R002BAlternate Bridge Approach Fills for Integral AbutmentsNew1/16/2018Provision
  • ​Addresses new bridge approach fill for integral abutments (2018 Roadway Standard Drawing No. 422.03)
  • Includes Contractor's option for new Type A Alternate Approach Fill for Integral Abutments
SP04 R002ABridge Approach FillsRevised1/16/2018Provision
  • ​Addresses new bridge approach fills (2018 Roadway Standard Drawing No. 422.01 and 422.02 and Roadway Detail Drawing No. 422D10)
  • Includes 3 new bridge approach fill types (Type I Standard Approach Fill, Type II Modified Approach Fill and Type III Reinforced Approach Fill for MSE Abutments)
SP05 R017Class IV Subgrade Stabilization in Lieu of Chemical StabilizationRevised1/16/2018Provision
  • ​Adds substitution is not allowed for chemically stabilized sections with geotextile for pavement stabilization
  • Makes minor updates for 2018 Standard Specifications
16Compaction GroutingNew1/16/2018Provision
  • Addresses compaction grouting to stabilize subgrades and embankments and prevent future subsidence
  • Requires the use of a prequalified Subsurface Grouting Contractor
  • Pays for compaction grouting in cubic feet of grout pumped and linear feet of grout pipe installed
SP09 R005Foundations and Anchor Rod Assemblies for Metal PolesRevised1/16/2018Provision
  • ​Adds standard foundation for light standards
  • Makes minor updates for 2018 Standard Specifications
Geotechnical Design Cell LibraryNew1/16/2018Cell
  • Removes Standard Embankment Monitoring and Rock Plating Details because these details are Roadway Standard Drawings No. 235.01 and 275.01, respectively, in the 2018 Roadway Standard Drawings
  • Revises Standard CIP and Segmental Gravity Wall Detail Nos. and CIP, Segmental and Precast Gravity Wall Cells and Notes because these wall types are Sections 453, 454 and 455, respectively, in the 2018 Standard Specifications
  • Revises Notes for the Concrete Barrier Rail with Moment Slab Cell because barrier rails with moment slabs are incorporated into Section 460 in the 2018 Standard Specifications
  • Revises Soldier Pile Wall Cell and Note because Section 442 is rewritten in the 2018 Standard Specifications
  • Revises MSE Wall Notes and MSE Abutment Wall Cells because bridge approach fill details and provisions will be significantly changed for 2018 lettings
Geotechnical Summary TablesRevised1/16/2018Form
  • ​Revises footnote for Summary of Aggregate Subgrade/Stabilization table
  • Adds Class IV Subgrade Stabilization to Summary of Geotextile for Pavement Stabilization table
7Geotextile for Pavement StabilizationRevised1/16/2018Provision
  • ​Adds Class IV Subgrade Stabilization over Geotextile for Pavement Stabilization for pavement sections with asphalt base or surface course
  • Makes minor updates for 2018 Standard Specifications
4MSE Retaining Walls (LRFD)Revised1/16/2018Provision
  • ​Revises provision for new Type III Reinforced Approach Fill for MSE Abutments
  • Removes restriction for 57 stone with geosynthetic reinforcement since Geogrid Evaluation Program includes full scale damage testing from NTPEP Evaluations
  • Makes minor updates for 2018 Standard Specifications
8,9Reinforced Soil Slopes, Cellular Confinement SystemsRevised1/16/2018Provision
  • ​Makes minor updates for 2018 Standard Specifications and other Department changes
  • Revises material requirements for geocell tendons and crest anchorages
  • Expands and further defines design requirements for cellular confinement systems
SP14 R004Roadway Lighting FoundationsNew1/16/2018Provision
  • ​Combines 2012 Roadway Standard Provision "High Mount Foundations" with Section 1405 "Standard Foundation" that was removed from the 2018 Standard Specifications
  • Addresses High Mount Foundation (2018 Roadway Standard Drawing No. 1402.01) and Standard Foundation (2018 Roadway Standard Drawing No. 1405.01)
Standard Foundation Notes (LRFD)Revised1/1/2018Notes
  • ​Adds new note for MSE abutment walls
  • Updates notes for 2018 Standard Specifications
Summary of Quantities WorksheetRevised11/29/2017Form
  • ​Updates pay item information for 2018 Standard Specifications and Special Provisions
  • Adds Class IV Subgrade Stabilization for geotextile for pavement stabilization
3,9,10Anchored Retaining Walls (LRFD), Soil Nail Retaining Walls (LFD-ASD), Soldier Pile Retaining Walls (LRFD)Revised5/16/2017Provision
  • ​Revises materials for most recent Geosynthetics (Section 1056) Provision
  • Updates geocomposite drains for most recent Geosynthetics (Section 1056) Provision
Anchored, Soil Nail and Soldier Pile Wall TypicalsRevised5/16/2017Cell
  • ​Updates geocomposite drains for most recent Geosynthetics (Section 1056) Provision
Drilled Piers (LRFD)Revised5/16/2017Provision
  • ​ Replaces Table 411-3 from the Standard Specifications with specific polymer slurry requirements for each approved polymer
  • Adds exception to method of measurement for SPT testing
6MSE Retaining Walls (LRFD)Revised5/16/2017Provision
  • Clarifies and improves wording
  • Adds electrochemical testing requirements for coarse aggregate from coastal plain sources
  • Adds exceptions to FHWA requirements for rubber bearing pads
  • Adds minimum gauge thickness for steel strip reinforcement
  • Adds aluminized coating as an option for steel strip reinforcement
  • Removes geostrips
  • Replaces prequalification with other requirements for engineers designing MSE panel walls
  • Addresses gap between concrete barrier and MSE wall facing
  • Adds corrugated steel pipes for pile sleeves
  • Adds polypropylene geogrid reinforcement for MSE abutment walls with polyester type (PET) geogrid reinforcement connected to SRW units
  • Adds materials for PET geogrid reinforcement vertical obstruction detail
MSE Wall Typicals and DetailsNew5/16/2017Cell
  • ​Adds 2 new abutment wall cells with pile sleeves
  • Adds polypropylene geogrid reinforcement to abutment wall cells for MSE abutment walls with polyester type (PET) geogrid reinforcement connected to SRW units
  • Adds geogrid cap connection detail to MSE abutment wall with SRW units cells
  • Adds a new cell for PET geogrid obstruction details for MSE segmental walls and moves leveling pad detail for SRW units to this cell
Piles (LRFD)Revised5/16/2017Provision
  • Adds requirement for when to use AASHTO driving stress limits for severe corrosive environments
  • Adds new pile driving equipment setup pay items​
7,8,10Precast Gravity Retaining Walls (LRFD), Segmental Gravity Retaining Walls (LRFD), Soldier Pile Retaining Walls (LRFD)Revised5/16/2017Provision
  • ​Addresses gap between concrete barrier and wall facing
Precast Gravity, Segmental Gravity and Soldier Pile Wall TypicalsRevised5/16/2017Cell
  • ​Addresses gap between concrete barrier and wall facing
453.01Standard CIP Gravity Retaining WallRevised5/16/2017Detail
  • ​Adds label to top of footing for payment purposes
Standard MSE Wall NotesRevised5/16/2017Notes
  • ​Adds new pile sleeve notes
Geotechnical Design Cell LibraryRevised1/20/2017Cell
  • Adds a new cell for private engineering box (PEF) insert
  • Updates borders and cells for PEF box placeholder location
  • Makes all notes in cells independent of each other to make drafting easier and adds note placeholders that do not print
Geotechnical Cell LibraryNew9/20/2016Cell
  • ​Adds a new cell for a private engineering box (PEF) insert
  • Adds a new supplemental legend for Geological Strength Index (GSI) Tables for both 11x17 & 8.5x11 sheets
  • Updates title sheets for PEF box placeholder location and index lists for GSI supplemental legend
  • Revises Appendix Cover Sheet to be both an Appendix Cover Sheet and a Divider Sheet for separate PDF files
20,21Slab Jacking, PolyurethanesNew9/20/2016Provision
  • ​Addresses slab jacking with cementitious grout and polyurethane foam
  • Requires the use of a prequalified Subsurface Grouting Contractor
  • Pays for slab jacking in square feet of slab raised but also includes estimated quantities of grout and foam for bidding purposes
  • Addresses polyurethane foam materials for slab jacking, void filling, leak sealing, permeation grouting, subgrade stabilization and other applications
  • Specifies 3 types of polyurethane with various components and properties
  • Requires the use of an approved foam from the Approved Products List based on polyurethane type
13Cellular Confinement SystemsNew4/19/2016Provision
  • ​Addresses geocells on slope faces for erosion control
  • References Roadside Environmental’s Compost Blanket provision for filling geocells
12Reinforced Soil SlopesRevised4/19/2016Provision
  • Formats provision for electronic plans
  • Addresses additional preconstruction meetings
  • Removes permanent soil reinforcement matting (PSRM)
  • Adds coir fiber mat and matting for erosion control with shoulder and slope borrow and geocells with compost blanket for slope erosion control
  • Removes restriction on Class II and III select material in the reinforced zone
14Rock EmbankmentsRevised4/19/2016Provision
  • ​Formats provision for electronic plans
  • Revises construction methods and adds rip rap for filling voids in top of rock embankments
1803.01,02Standard Reinforced Soil Slope with High Groundwater, Standard Reinforced Soil Slope with Low GroundwaterRevised4/19/2016Detail
  • ​Removes permanent soil reinforcement matting (PSRM)
  • Adds coir fiber mat and matting for erosion control with shoulder and slope borrow and geocells with compost blanket for slope erosion control
  • Removes restriction on Class II and III select material in the reinforced zone
  • Renames standard drawing to standard detail
  • Revises LTDS and L/H Ratio table ranges to 12 ft increments
  • Creates 2 standard RSS details, one for high groundwater and another for low groundwater
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