Presentation on theme: " 120-8.1 Embankment Construction – LOTs What is the maximum length of a LOT? Mainline pavement lanes, turn lanes, ramps, parking lots, concrete box."— Presentation transcript:
Embankment Construction – LOTs What is the maximum length of a LOT? Mainline pavement lanes, turn lanes, ramps, parking lots, concrete box culverts and retaining wall systems A LOT is defined as a single lift of finished embankment not to exceed 500 feet. Shoulder-Only areas, bike/shared use paths, and sidewalk areas A LOT is defined as 2000 feet or one Day’s Production, whichever is greater.
Question from Industry – How is Independent Verification processed. Section Independent Verification ◦ In addition to the Verification testing, the Engineer may perform additional Independent Verification (IV) testing. The Engineer will evaluate and act upon the IV test results in the same manner as Verification test results.
QC Sample pcf VT Proctor pcf IV Proctor – 116 pcf Resolution Proctor 116 pcf What proctor should we use? Should they resample the material?
Where is RAP prohibited? ◦ Construction areas that are below the seasonal high groundwater table elevation. ◦ The top 12 inches of embankment. ◦ MSE Wall backfill. Minimize RAP content to avoid possible long term settlement
Specifications ◦ Soil & RAP mixture Prohibited in Retaining Wall Systems ◦ Alternate Layer Construction ◦ Shoulder Base 283 ◦ Stabilizing Material 914
Test Strip Requirements for 12 inch thick compacted lifts. – In the soil envelope - maximum allowed thickness of backfill is 6 inches. Requirements for max. 12 inch thick compacted Earthwork SectionEmbankment Pipe Backfill A-3 and A-2-4 soils with up to 15% fines No Test strip required Test strip required A-1, Plastic materials, and A-2- 4 Materials with greater than 15% fines Test strip required
Bedding Zone 4” below the pipe PIPE Top Zone - Up to the base or final grade Cover Zone 1 foot above pipe Lowest Zone Bottom of Trench Soil Envelope (No Thick Lift)
How many passing density tests are required before the contract allows Reduced Frequency Density Testing for; Pipe backfill Embankment
Reduced Frequency Testing is allowed after 12 passing tests with no Resolution tests in favor of Verification. Required to use similar compaction effort on the untested LOT Select test location randomly from one of the two LOTs under consideration. Requires Engineer’s permission to place material over untested LOT Not allowed in shoulder only areas, sidewalks bike/shared use paths. (LOT size)
Reduced Frequency Testing is allowed after 6 passing tests with no Resolution tests in favor of Verification. Required to use similar compaction effort on the untested LOT Select test location randomly from one of the two LOTs under consideration. Requires Engineer’s permission to place material over untested LOT
Plastic and Metal pipe backfill requires 95% of Standard Proctor for density. Concrete pipe backfill requires 100% of Standard Proctor. Structure backfill requires 100% of Standard proctor regardless of the type of pipe joining the structures.
Metal pipe requires 95% maximum density Structure requires 100% maximum density The pipe and structure require separate density tests because of different density requirements. This will be clarified in the July 2013 specifications
Commercial Material - Approved Source (usually Aggregate Base) Requires a Cert from the Mine No field sampling or testing required Existing Base No testing requirements IV testing is encouraged and should be performed on any material if there are concerns i.e. bad clay or organic materials … Local Materials Acceptance requires: Source investigation (440 /440A– Projects let after 3/1/11 ) Sample & test from the roadway for material acceptance (440/440B - Projects let after 3/1/11)
Meet the requirements of Section (440/440A) Local material may be clay from on-site, material from another construction project, or possibly byproducts from a process. The Specifications require testing of the material before it is brought to the roadway and spread. Sampling Section 914 requires a minimum of 3 organic content test results and one LL/PI test result per source. The Engineer should partner with the contractor to investigate the source or stockpile and evaluate each material. (best practice) Use one sample card for each source or stratum of material Provide a minimum of 3 - ½ bags of material for each source
“Material ID” - Enter 440 for projects let prior to March 1, 2011 and 440A if the project is let after March 1, 2011 (This will show in the project job guide schedule) “Remarks” - Enter “Source testing “ “Sample Number – Enter “C001”, “C002”, “C003”, etc and either “Q” or “V” 1- 16
Sampling and Testing of Local Materials - Section (440/440B) Requires Sampling after spreading and before mixing QC 1 per 2 LOTs – VT 1 per 8 LOTs “Sample Numbering” - “C001”, “C002”, “C003”, etc and “Q” or “V” Collect three pint size bags of material across the roadway (FM 1 – T267) Engineer Verification, Resolution and Acceptance Stabilizing materials require acceptance before the material is mixed into the Subgrade 1- 17
“Material ID” - Enter 440 for projects let prior to March 1, 2011 and 440B if the project is let after March 1, 2011 (This will show in the project job guide schedule) “Sample Number” – Enter “C001”, “C002”, “C003”, etc and either “Q” or “V” “Plant or Pit No.” Enter “ROADWAY“ “QUANT REP” Enter “LOTS 1 thru 8” “Remarks” Enter “LL/PI and ORGANIC TEST” 1- 18
◦ Source Investigation (440/440A) Evaluate the stockpile as a local material If failing organic content is due to the asphalt content of RAP or RAP Blended material the department may modify acceptance (after careful evaluation) Modified Acceptance for RAP or RAP Blend (440/440B) ibrary/materialsbulletins/topics/2011/mb02-11.pdf Sample for LL/PI before mixing Sample and test for Asphalt Content (FM 5-563) (NCAT) after Mixing The upper limit for FM in the mixed Subgrade is 4.7% Failure may indicate too much Asphalt or the presence of a material with a high organic content 1- 20
Sample after spreading and before mixing according to (440/440B) Sample Transmittal Card Example: “Remarks” “RAP Premixing no organic test” “ LL/PI test only” Sample size is ½ bag 1- 21
Sample the material after mixing in (440/440B) Sample size is 1 bag Sample Transmittal Card Example Use the same sample number as used for LL/PI testing “remarks” “RAP - Substitute FM for FM1-T267” 1- 22
Standard Proctor Maximum Density Determination: The Engineer will verify the Quality Control results if the results compare within 4.5 lb/ft 3 of the Independent Verification Verification test result. Otherwise, the Engineer will take one additional sample of material from the soil type in question. The State Materials Office or an AASHTO accredited laboratory designated by the State Materials Office will perform Resolution testing. The material will be sampled and tested in accordance with AASHTO T-99, Method C. The Engineer will compare the Resolution Test results with the Quality Control test results. If all Resolution Test results are within 4.5 lb/ft 3 of the corresponding Quality Control test results, the Engineer will use the Quality Control test results for material acceptance purposes for each LOT with that soil type. If the Resolution Test result is not within 4.5 lb/ft 3 of the Contractor’s Quality Control test, the Independent Verification Verification Test result will be used for material acceptance purposes. A1
1- 27 NameOfficeTelephone Timmy MeeksDistrict 1 & Larry KeenDistrict Tonya MyersDistrict Ernst RegistreDistrict 4 & Joe OwensDistrict Ed CuetoFlorida Turnpike Daniel PitocchiState Materials Office A4
1- 28 NameOfficeTelephone Barbara Beacham District 1 & Vacant Position District T.B.D. Chad MillerDistrict Ron ArcalasDistrict 4 & Jody CliftonDistrict 5 Materials Todd KellyFlorida Turnpike Ben WatsonState Materials Office A5