| SP05 R008 | Aggregate Subgrade | Memo Link | Revised | 3/21/2023 | Provision | - Renames "Subbase" as "Subsoil" defined as the portion of the roadbed below the Class IV subgrade stabilization
- Replaces "Geotextile for Soil Stabilization, Type 4" with "Geotextile for Subgrade Stabilization, Type 5" and adds pay item for Geotextile for Subgrade Stabilization
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| SP05 R017 | Aggregate Subgrade in Lieu of Chemical Stabilization | | Revised | 3/21/2023 | Provision | - Renames provision from "Class IV Subgrade Stabilization in Lieu of Chemical Stabilization" to "Aggregate Subgrade in Lieu of Chemical Stabilization"
- Adds reference to Type 2 Aggregate Subgrade
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| SP10 R056 | Geosynthetics | | New | 3/21/2023 | Provision | - Updates Type 5 Geotextile to Class 4A Geotextile in accordance with AASHTO M288 and incorporates new AASHTO NTPEP SSGEO Work Plan
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| SP05 R009 | Geotextile for Subgrade Stabilization | | New | 3/21/2023 | Provision | - Renames "Geotextile for Pavement Stabilzation" as "Geotextile for Subgrade Stabilization"
- Turns geotextile 90 degrees, parallel to survey line, with the minimum roll width required under roadway edges and shoulders nearest to fill slopes
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| Geotechnical Summary Tables | | Revised | 2/3/2023 | Form | - Updates tables for Geotextile for Subgrade Stabilzation changes
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| Summary of Quantities Worksheet | | Revised | 2/2/2023 | Form | - Updates pay item information for Aggregate Subgrade changes
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| Concrete Barrier Rail With Moment Slab Details | | Revised | 10/19/2021 | Cell | - Adds note to align joints in rail with joints in wall facing
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| Geotechnical Design Cell Library | | Revised | 10/19/2021 | Cell | - Adds Wall ID with corresponding instructions to structure borders
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| Geotechnical Foundation Tables | Memo Link | New | 10/19/2021 | Form | - Microsoft Excel sheet with geotechnical foundation tables for the Structure plans
- Includes tables for pile, drilled pier, spread footing and micropile foundations
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| 17 | Micropiles (LRFD) | | Revised | 10/19/2021 | Provision | - Adds option for ASTM A252 reinforcing casing with 80 ksi yield strength
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| 3,4,5,6 | MSE, Anchored, Soil Nail and Soldier Pile Retaining Walls (LRFD) | | Revised | 10/19/2021 | Provision | - Redefines H, "Design Height and "Wall Height"
- Adds geostrip reinforcement for MSE walls
- Adds black base cap for paving on aggregate above and behind MSE, anchored and soldier pile walls
- Changes pH requirement for PET geogrid reinforcement for MSE walls from 5-8 to 4.5-9
- Updates seismic design criteria for MSE walls to be consistent with other previously updated wall provisions and current AASHTO & NCDOT Structures Management policies/guidelines
- Adds requirement that PP geogrids for MSE walls be made in the USA
- Eliminates HDPE bearing pads from MSE walls with panels
- Sets minimum steel gauge and grade for steel strip connectors for MSE walls with panels
- Clarifies measurement and payment for backfilling behind MSE, anchored and soldier pile walls
- Updates Soil Nail Retaining Walls provision for the latest editions of the AASHTO LRFD Bridge Design Specifications and AASHTO LRFD Bridge Construction Specifications
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| SP04 R005 | Piles | Memo Link | New | 10/19/2021 | Provision | - Makes changes to Section 450 to implement new geotechnical foundation tables and pile order lengths for all prestressed concrete piles
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| 10 | Rock Embankments | | Revised | 10/19/2021 | Provision | - Updates measurement and payment to avoid duplicate pay items in contracts
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| 453.01 | Standard CIP Gravity Retaining Wall | | Revised | 10/19/2021 | Detail | - Redefines H, "Design Height" and "Wall Height"
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| Standard Foundation Notes (LRFD) | | Revised | 10/19/2021 | Notes | - Adds new reworded pile sleeves note that was removed from MSE wall notes
- Removes about half the standard foundation notes and rewords some others for the new geotechnical foundation tables
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| Standard MSE, Anchored, Soil Nail, Soldier Pile, Precast and Segmental Gravity Wall Cells | | Revised | 10/19/2021 | Cell | - Redefines H, "Design Height" and "Wall Height"
- Relabels "Backfill" material as "Retained" material for MSE, precast and segmental gravity walls
- Adds geostrip reinforcement for MSE walls
- Adds black base cap for paving on aggregate above and behind MSE, anchored and soldier pile walls
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| Standard MSE, Anchored, Soil Nail, Soldier Pile, Precast and Segmental Gravity Wall Notes | | Revised | 10/19/2021 | Notes | - Redefines H, "Design Height" and "Wall Height"
- Relabels "Backfill" material as "Retained" material for MSE, precast and segmental gravity walls
- Adds seismic note for MSE walls for consistency with changes to MSE Wall provision for seismic criteria
- Removes pile sleeves note from MSE wall notes and adds new reworded pile sleeves note to standard foundation notes
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| 454.01,02 | Standard Segmental Gravity Retaining Walls | | Revised | 10/19/2021 | Detail | - Redefines H, "Design Height" and "Wall Height"
- Increases maximum wall height to 5 ft by increasing minimum wall batter and moving traffic surcharge further behind wall face
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| 11,12 | Standard Shoring and Temporary Soil Nail Walls | | Revised | 10/19/2021 | Provision | - Updates Temporary Soil Nail Walls provision to reflect previous and current applicable updates in the Soil Nail Retaining Walls provision
- Adds hollow bar nails as an option for temporary soil nail walls
- Updates neat cement grout requirements for temporary soil nail walls to be consistent with changes made previously in the Soil Nail Retaining Walls provisions
- Updates Standard Shoring provision for changes to NCDOT Geosynthetic Reinforcement Evaluation Program
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| 1801.02 | Standard Temporary Wall | | Revised | 10/19/2021 | Detail | - Updates notes on sheet 2 to reflect changes to NCDOT Geosynthetic Reinforcement Evaluation Program
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| SP11 R002 | Temporary Shoring | | Revised | 10/19/2021 | Provision | - Updates neat cement grout requirements to be consistent with changes made previously in the Anchored Retaining Walls provision
- Updates Standard Shoring provision for changes to NCDOT Geosynthetic Reinforcement Evaluation Program
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| 17 | Micropiles (LRFD) | | New | 4/21/2020 | Provision | Standardizes
current Micropiles Project Special Provision Requires the
use of a prequalified Micropile Contractor and a prequalified Micropile Design
Consultant Conforms to
current AASHTO LRFD Bridge Design Specifications for LRFD micropile design Uses nominal wall thickness for reinforcing casings
Conforms to
current AASHTO LRFD Bridge Construction Specifications for micropile load
testing Specifies prime mill certified steel pipes for reinforcing casings that meet NCDOT
"Buy American" requirements
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| Standard Micropile Notes | | New | 4/21/2020 | Notes | - Standardizes current micropile notes on plans to be consistent with new Micropiles (LRFD) provision
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| Anchored and Soil Nail Retaining Wall Cells | | Revised | 12/17/2019 | Cell | - Adds seismic note to Anchored Wall and Soil Nail Wall Cells with standard notes
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| 3,5,6 | Anchored, Soldier Pile and Soil Nail Retaining Walls (LRFD) | | Revised | 12/17/2019 | Provision | - Updates Anchored and Soil Nail Wall Provisions for 2018 Standard Specifications
- Updates Soildier Pile Wall Provision for consistency with Anchored Wall and Soil Nail Wall Provisions
- Revises seismic criteria for anchored and soil nail walls to meet AASHTO and Structure Management Unit requirements
- Changes grout requirements for ground achors and soil nails to be consistent with Structure Bulletin and AASHTO soil nail wall ballot items
- Incorporates LRFD design for soil nail walls through AASHTO soil nail wall ballot items
- Incorporates Slide and new Snail software programs for soil nail wall analysis and design verification
- Incorporates AASHTO LRFD Bridge Construction Specifications for soil nail wall materials, corrosion protection and nail testing through AASHTO soil nail wall ballot items
- Clarifies traffic impact requirements for soil nail wall design
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| Geotechnical Summary Tables | | Revised | 12/17/2019 | Form | - Adds new table for horizontal drains
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| SP08 R017 | Horizontal Drains | | New | 12/17/2019 | Provision | - Creates new provision for horizontal drains with or without drain pipes to drain water from slopes and rock cuts and from behind retaining walls
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| 8 | Reinforced Soil Slopes | | Revised | 12/17/2019 | Provision | - Revises provision for new Geosynthetic Reinforcement Evaluation Program (formerly called Geogrid Evaluation Program)
- Updates link for list of approved geosynthetic reinf. (list was moved from the M&T website to the Geotech website) for primary geogrids
- Adds requirement for American made biaxial geogrids for secondary geogrids
- Increases minimum width/length of secondary/primary geogrids to 6'
- Removes option for splicing primary geogrids
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| Standard Anchored and Soil Nail Retaining Wall Notes | | Revised | 12/17/2019 | Notes | - Adds seismic note for consistency with changes to Anchored Wall and Soil Nail Wall provisions for seismic criteria
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| 817.01 | Standard Horizontal Drain | | New | 12/17/2019 | Detail | - Creates new standard detail for horizontal drains with or without drain pipes to drain water from slopes and rock cuts and from behind retaining walls
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