Development of design guidelines for proper selection of graded aggregate base in Maryland state highways.

Details

• Creators:
  Aydilek, Ahmet H. ; Haider, Intikhab ; Cetin, Altan ; Kaya, Zulkuf ; Hatipoglu, Mustafa
• Corporate Creators:
  University of Maryland (College Park, Md.)
• Subject/TRT Terms:
  Aggregate Gradation Base Course (Pavements) Deformation Drainage Field Tests Laboratory Tests Mechanistic-empirical Pavement Design Modulus Of Resilience Moisture Content Stiffness
• Publication/ Report Number:
  MD-15-SP109B4G-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  Maryland
• Corporate Publisher:
  Maryland. State Highway Administration. Office of Policy & Research
• Abstract:
  The mechanical and drainage properties of graded aggregate base material are the level one input in mechanistic
  
  pavement design. Maryland State Highway Administration (SHA) is in need of guidelines for evaluation of stiffness
  
  and drainage characteristics of graded aggregate base (GAB) stone delivered at highly variable gradations to the
  
  construction sites. To fulfill the current need, the mechanical and drainage properties of several Maryland GAB
  
  materials were evaluated in the laboratory and field. The resilient modulus and hydraulic conductivity test results
  
  obtained in the laboratory were compared to the field moduli and hydraulic conductivity. The effect of moisture
  
  content on resilient modulus was also evaluated. Summary resilient modulus, SMR values at Optimum Moisture
  
  Content (OMC) minus 2% were higher than those at OMC, with few exceptions; however, the permanent
  
  deformations increased with moisture beyond OMC. The control of moisture content within 2% of OMC would not
  
  significantly affect the resilient modulus and permanent deformation in construction. It was also concluded that an
  
  addition of 4-6% fines over the SHA specification limit of 8% resulted in 2-5 times decrease in the laboratory-based
  
  GAB hydraulic conductivities and an increase in time for 50% completion of the drainage from the highway base.
  
  The required base thickness increased 2.6 to 7 times as a result of fines increased from 2 to 14% for selected GAB
  
  materials evaluated. It is recommended that resilient modulus, permanent deformation, as well as hydraulic
  
  conductivity of GAB materials, are evaluated for designing a highway base with adequate stiffness and drainage
  
  performance
  
  
• Format:
  PDF
• Funding:
  SP109B4G
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:c10625a805d950f4617f9f2dd6f967fbbc493082f8fdb590f769b5987ab73eaf
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28445/dot_28445_DS1.pdf
• File Type:
  [PDF - 1.28 MB ]