1616thth Annual ICAR Symposium Annual ICAR SymposiumSession C1: DOT/Federal Agency Session C1: DOT/Federal Agency

PanelistsPanelists

Aggregate Issues in OklahomaAggregate Issues in OklahomaKenneth Ray Hobson, P.E.Kenneth Ray Hobson, P.E.QA Engineer – Materials QA Engineer – Materials

DivisionDivisionMay 14, 2008May 14, 2008

OutlineOutline

• Materials Division Web Site Materials Division Web Site – 5 Step Review of Aggregate Information5 Step Review of Aggregate Information

• Aggregate Base Research Aggregate Base Research

• AIMS ResearchAIMS Research

• Micro-Deval UsageMicro-Deval Usage

Materials DivisionMaterials DivisionWeb Site NavigationWeb Site Navigation

for Aggregate Informationfor Aggregate Information

• Step 1: Navigate to the Materials Web Step 1: Navigate to the Materials Web SiteSite

http://odot.org/materials

Materials DivisionMaterials DivisionWeb Site NavigationWeb Site Navigation

for Aggregate Informationfor Aggregate Information

• Step 1: Navigate to the Materials Web Step 1: Navigate to the Materials Web SiteSite

• Step 2: Navigate to Materials & TestingStep 2: Navigate to Materials & Testing

http://odot.org/materials

/materials.htm

Materials DivisionMaterials DivisionWeb Site NavigationWeb Site Navigation

for Aggregate Informationfor Aggregate Information

• Step 1: Navigate to the Materials Web Step 1: Navigate to the Materials Web SiteSite

• Step 2: Navigate to Materials & TestingStep 2: Navigate to Materials & Testing

• Step 3: View Approved Aggregate Step 3: View Approved Aggregate MaterialsMaterials

APL

ALL

Materials DivisionMaterials DivisionWeb Site NavigationWeb Site Navigation

for Aggregate Informationfor Aggregate Information

• Step 1: Navigate to the Materials Web Step 1: Navigate to the Materials Web SiteSite

• Step 2: Navigate to Materials & TestingStep 2: Navigate to Materials & Testing

• Step 3: View Approved Aggregate Step 3: View Approved Aggregate MaterialsMaterials

• Step 4: View Aggregate Test DataStep 4: View Aggregate Test Data

Test Data

Coarse Aggregate

Coarse Agg. Data

Materials DivisionMaterials DivisionWeb Site NavigationWeb Site Navigation

for Aggregate Informationfor Aggregate Information

• Step 1: Navigate to the Materials Web Step 1: Navigate to the Materials Web SiteSite

• Step 2: Navigate to Materials & TestingStep 2: Navigate to Materials & Testing

• Step 3: View Approved Aggregate Step 3: View Approved Aggregate MaterialsMaterials

• Step 4: View Aggregate Test DataStep 4: View Aggregate Test Data

• Step 5: Aggregate SpecificationsStep 5: Aggregate Specifications

Bases

303

Materials

703

Aggregate Base ResearchAggregate Base Research

• Team with ODOT, Contractors and Academia (OTI)Team with ODOT, Contractors and Academia (OTI)• Design New GradationDesign New Gradation

– Require High PermeabilityRequire High Permeability– Producible Producible

• Field Test ProjectField Test Project– Control SectionsControl Sections– GeotextilesGeotextiles– Various Gradations (new and existing)Various Gradations (new and existing)– Test at Various Stages Test at Various Stages

• Constructed at the University of OklahomaConstructed at the University of Oklahoma

AIMS ResearchAIMS Research

• Researchers at the University of OklahomaResearchers at the University of Oklahoma– Dr. Zaman, Dr. Laguros and Ashish GuptaDr. Zaman, Dr. Laguros and Ashish Gupta

• Coarse AggregateCoarse Aggregate– Quantify: 3-d Shape, Angularity and TextureQuantify: 3-d Shape, Angularity and Texture– Sizes 4.75 - 37.5 mmSizes 4.75 - 37.5 mm

• Fine AggregateFine Aggregate– Quantify: 3-d Shape and AngularityQuantify: 3-d Shape and Angularity– Sizes 4.75 – 0.15 mmSizes 4.75 – 0.15 mm

Micro-Deval UsageMicro-Deval Usage

• Adopted in 2003 by Special Provision for HMAAdopted in 2003 by Special Provision for HMA– Max Loss of 25 for 30 Million ESALsMax Loss of 25 for 30 Million ESALs

• Paper and Field Performance Reviewed to set Paper and Field Performance Reviewed to set SpecificationSpecification– In-House Research Varied Temperature, In-House Research Varied Temperature,

Loading and GradationLoading and Gradation• Change is not Easily AcceptedChange is not Easily Accepted• AASHTO Standard to be RevisedAASHTO Standard to be Revised

Thank you!Thank you!

khobson@odot.orgkhobson@odot.org