Field Demonstration of Blended Base Courses

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Soil and Materials Engineers, Inc.

Field Demonstration of Blended

Base Courses Containing Recycled Concrete Aggregate and

Foundry Sand

11/28/2012

consultants in the geosciences, materials and the environment

Presented By: John E. Dingeldein, P.E.

consultants in the geosciences, materials and the environment

Acknowledgements :

Grant Funded by EPA

Sponsored by AFS First - Mike Lenahan President

Administered by – Elizabeth Olenbush

Project Provided by Village of Cuyahoga Heights – Paul Dey, P.E.

Materials & Technical Support - Kurtz Bros. - John Kurtz

Field and Laboratory Services by SME – John Dingeldein, P.E.

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STATEMENT

Highway administrations are moving more

and more to construction green highways using more and more recycled materials. By

combining two of the largest recycling

streams in the region, Recycled Concrete

(RCA) and Foundry Sand (FS), a successful

blend of materials can be produced for

roadway base and other uses.

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PROJECT OBJECTIVES

� Enlarge the market for recycled materials.

� Compare the performance of a RCA/FS blended to

a ODOT 304 gradation with that of the standard

ODOT 304 crushed limestone base.

� Expand business for recycled materials generators.

� Generate data to help develop future standards

and specifications for the use of recycled

materials.

� Develop and disseminate a case study.

Field Demonstration of Blended Base Courses

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Project Location – Village of Cuyahoga Heights, OH

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Site Plan with Test Locations

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TEST SECTIONS

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Typical Boring Log

Field Demonstration of Blended Base Courses

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Typical CPT Log

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DESIGN PAVEMENT TEST SECTION

� 1 ¼ inches of ODOT Item 448 Asphalt Concrete Surface Course

� 2 ¾ inches of ODOT Item 448 Asphalt Concrete Intermediate

Surface Course, Type 2

� 6 inches of ODOT Item 301 Bituminous Base

� 10 inches of ODOT 304 Aggregate Base

� Calculated Equivalent Structural Number , SN = 5.08

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Boxes like this one maybe used for photo captions,

or for text in combination with images.

Project Location – Village of Cuyahoga Heights, OH

SAMPLE DESCRIPTION CBR P200MAX DRY DENSITY, PCF

ASTM D698

OPTIMUM MOISTURE

CONTENT, %

8521Subgrade FILL: Cinders, gravel,

brick & slag2 23 101 18

8454 Recycled Concrete --- 4.4 --- ---

8428 Foundry Sand 18 9.5 114 15

8525 304 RCA/FS Blend 34 7.9 119 13

8522 304 Crushed Limestone 55 11 141 6

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GRAIN SIZE DISTRIBUTIONS

Field Demonstration of Blended Base Courses

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BASE & ASPHALT COMPACTION

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Boxes like this one maybe used for photo captions,

or for text in combination with images.

Project Location – Village of Cuyahoga Heights, OH

MATERIAL COMPACTION MOISTURE

SUBGRADE 81% 20%

304 LIMESTONE 95% 5.60%

304 RCA/FS 99% 11%

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FWD EQUIPMENT

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FWD EQUIPMENT

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FWD SECTION – IDEALIZED

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Average SN for LS 4.28 Average SN for RCA/FS 4.32

FWD RESULTS

LS RCA/FS

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SAMPLING LYSIMETERS

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Water Quantity Data Water Quality Parameters Analytical Data

Sample

Location,

Date

Height of

water in

lysimeter

(ft)

Estimated

Volume of

water in

lysimeter

(gal)

pHConductivity

(µS/cm)

Temperature

(Deg C)Arsenic (mg/l) Barium (mg/l)

Cadmium

(mg/l)

Chromium

(mg/l)

Lysimeter A,

12/23/2011 1.5 5 6.93 3,160 5.6 0.308 0.0134 <0.0010 <0.010

Lysimeter B,

12/23/2011 1.04 4.95 12.45 3,820 5.7 0.959 0.0794 0.00152 0.0369

Lysimeter A,

1/23/2012 1.34 5 7.42 929 5.5 0.154 <0.10 <0.10 <0.10

Lysimeter B,

1/23/2012 0.44 2.09 12.26 3,930 5.6 0.761 <0.10 <0.10 <0.10

Lysimeter A,

2/27/2012 1.34 5 6.87 766 6.2 0.102 <0.10 <0.10 <0.10

Lysimeter B,

2/27/2012 0.79 3.76 12.59 3,480 6.3 0.354 <0.10 <0.10 <0.10

Lysimeter A,

3/23/2012 1.21 5 8.08 637 17.0 0.227 <0.10 <0.10 <0.10

Lysimeter B,

3/23/2012 0.14 0.67 12.13 1,695 17.0 0.839 <0.10 <0.10 <0.10

ANALYTICAL RESULTS FROM LYSIMETERS

Field Demonstration of Blended Base Courses

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SUMMARY

� The FWD data indicates that the RCA/FS blend for

base course functions as well as standard ODOT

304 crushed limestone when placed over the same subgrade materials.

� Refining of the RCA/FS gradation by more

controlled processing may produce an even better

base.

� The analytical results for metals are very similar for both materials but are higher for the RCA/FS

base. This may be due to less water flow through

the base.