Material Characterization

Material Acceptance & Characterization

The materials selected for the construction of CC8 included:

 

  • P-152M subgrade,
  • P-154M subbase,
  • P-306MR lean concrete base course,
  • P-404MR bituminous bondbreaker layer;
  • and P-501MR PCC surface course.

 

As part of the CC8 construction, material characterization was performed on the different material layers.

Acceptance and characterization tests were performed on subgrade, subbase, base and Portland Cement Concrete (PCC) materials.

 

A brief description of the acceptance and material characterization tests performed is provided below.

Acceptance Tests

  • California Bearing Ratio (CBR) - was performed in accordance with ASTM D4429.
  • Sand Cones - were performed in accordance with ASTM D1556.
  • Nuclear Density Gauge (NDG) - tests were performed in accordance with ASTM D6938.

 

Material Characterization Tests

  • Drive Cylinder - performed along with each CBR test performed and in accordance with ASTM D2937.
  • Plate Load Test - performed in accordance with ASTM D1195.
  • Vane Shear performed at each CBR location and in accordance with ASTM D2573.
  • Lightweight Deflectometer (LWD) - performed in accordance with ASTM E2583.
  • Dynamic Cone Penetrometer (DCP) - performed in accordance with ASTM D6951.
  • Portable Seismic Properties Analyzer (D-PSPA/PSPA) - performed to measure the seismic modulus of the material. 

Pre-Construction Tests

Prior to the construction of CC8, tests were performed on the P-152M subgrade and P-154M subbase material. Pre-construction tests were as followed:

 

Subgrade (DuPont Clay):  Two sets of Modified Proctor and laboratory CBR tests were conducted on the P-152M subgrade (DuPont Clay). CBR tests were performed on the proctor sample by turning the sample in the mold up-side down.

 

P-154M Subbase Material: Two sets of Modified Proctor and Gradation analysis were performed on the P-154M subbase material. Gradation tests were conducted to ensure the material met the required specifications of P-154M. The Modified Proctor test provided the necessary moisture and density criteria for obtaining the compaction required for the P-154M material.

 


To view the Material Characterization tests performed on the P-152M subgrade and P-154M subbase materials click here.


For more information on the Material Acceptance & Characterization for CC8 click on the links in the table below.  

 

P-152M Subgrade (DuPont Clay)

Acceptance tests

 

CBR Tests: Three CBR tests were conducted on the top of every subgrade lift at random locations.

 

Density & Moisture: Drive Cylinder tests were performed at the same location and time as the CBR tests.

 

Elevation Survey: An elevation survey was performed to determine the grade, thickness and smoothness of each material layer placed. The top of the subgrade layer was graded within tolerance (± 3/4 in.) and then surveyed to obtain the final elevations.

 

Characterization test

 

Vane Shear Tests: Tests were performed on the surface of the top layer at offsets -25 ft., -15 ft., -5 ft., +5 ft., +15 ft. and +25 ft. at STA 345, 360 and 375.

 

Plate Load Tests & CBR Tests: Tests were conducted on the top of the subgrade surface at offsets -15 ft. and +15 ft. at STA 360.

 

DCP, LWD & D-PSPA Tests: Tests were performed on the top of the subgrade at offsets -25 ft., -15 ft., -5 ft., +5ft., +15 ft. and +25 ft. at STA 345, 360 and 375.

 

Resilient Modulus Tests: Four Shelby Tubes were taken from the top of the subgrade to perform resilient modulus tests and unconfined compressive strength tests.

P-154M Subbase Material

Acceptance tests

 

Density Tests: Three 6-inch Sand Cone tests were performed on each lift of material at random locations.

 

Elevation Survey: An elevation survey was performed to determine the grade, thickness and smoothness of each material layer placed. The top of the subbase layer was graded within tolerance (± 3/8 in.) and then surveyed to obtain the final elevations.

 

Characterization Tests

 

Nuclear Density Gauge: Tests were performed at locations near the sand cone tests as well as at offsets -25 ft., -15 ft., -5 ft., +5 ft., +15 ft. and +25 ft. at STA 345, 360 and 375.

 

Plate Load Tests & CBR Tests: Plate Load and CBR tests were performed on the top of the subbase layer at offsets -15 ft., and +15 ft. at STA 360.

 

DCP, LWD & D-PSPA Tests: DCP, LWD and D-PSPA tests were performed on the top of the subbase layer at offsets -25 ft., -15 ft., -5 ft., +5ft., +15 ft. and +25 ft. at STA 345, 360 and 375.

 

Resilient Modulus Tests: Resilient Modulus tests were performed on samples that were collected from the subbase material.

P-306MR Lean Concrete Base Course

NAPTF NextGen Pavement Materials Laboratory Tests

 

Material characterization testing was performed at the 7 and 28 days of curing for the P-306MR material. The tests consisted of:

 

  • Free Free Resonant Column (FFRC)
  • Density
  • Compressive Strength

 

Acceptance Testing consisted of:

  • Slump
  • Air Content
  • Unit Weight
  • Temperature of fresh concrete

P-404MR Bituminous Bondbreaker

No in-house material characterization was performed on the P-404MR material.

P-501MR Portland Cement Concrete (PCC) Surface Course

Field Characterization Tests

 

PSPA: These tests were performed on the top of the P-501MR at offsets -25 ft., -15 ft., -5 ft., +5ft., +15 ft. and +25 ft. at STA 345, 360 and 375.

 

NAPTF NextGen Pavement Materials Laboratory Tests

Gradation of the P-501MR material was performed to confirm the aggregates in the concrete mix.

 

Material characterization testing was performed at the 7 and 28 days of curing for the P-501MR material. The tests consisted of:

 

  • Free Free Resonant Column (FFRC)
  • Density
  • Compressive Strength/Flexural Strength
  • Tensile Strength
  • Static Modulus

 

*FFRC and Flexural Strength tests were performed prior to trafficking for each phase of CC8.

 

Acceptance Testing consisted of:

  • Slump
  • Air Content
  • Unit Weight
  • Temperature of fresh concrete

Return to Construction Cycle 8 Overview