Design highwater clearances for highway pavements appendix : volume II, appendix, August 2008.
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

For very narrow results

When looking for a specific result

Best used for discovery & interchangable words

Recommended to be used in conjunction with other fields

Dates

to

Document Data
Library
People
Clear All
Clear All

For additional assistance using the Custom Query please check out our Help Page

ROSA P serves as an archival repository of USDOT-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by USDOT or funded partners. As a repository, ROSA P retains documents in their original published format to ensure public access to scientific information.
i

Design highwater clearances for highway pavements appendix : volume II, appendix, August 2008.

Filetype[PDF-2.63 MB]


English
Details You May Also Like

Details:

  • Creators:
  • Corporate Creators:
    FAMU-FSU College of Engineering (Tallahassee, Fla.). Civil & Environmental Engineering
  • Corporate Contributors:
    Florida. Department of Transportation. Research Center
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FL/DOT/RMC/BD-543-13
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Florida
  • Edition:
    Appendix.
  • Corporate Publisher:
    FAMU-FSU College of Engineering (Tallahassee, Fla.). Civil & Environmental Engineering
  • Abstract:
    High groundwater table exerts detrimental effects on the roadway base and the whole pavement. Base clearance guidelines have been developed to prevent water from entering the pavement system in order to reduce its detrimental effects. In these guidelines a minimum height, the clearance, between a groundwater level and a particular elevation within the pavement system is specified. This report presents an experimental study to evaluate the effects of high groundwater and moisture on determining pavement base clearance for granular subgrades. Full-scale in-lab test-pit tests were conducted to simulate pavement profile and vehicle dynamic impact on the pavement. Eleven types of subgrade were tested for this study. From the test, using layer theory, the results of the resilient modulus for each layer (layer resilient modulus) can be compared with the resilient modulus results from laboratory test. The dominant factor or factors of the effect of moisture to resilient modulus will be discussed. The results showed that a 36-in. base clearance was considered adequate for the base protection of most of the A-3 and A-2-4 subgrades against high groundwater tables. The lab resilient modulus and layer resilient modulus had the same trend for each soil according to the moisture content change. The percent of fines or the percent of clays of subgrade soil was not a good indicator to measure the influence of moisture effect on the resilient modulus. The coefficient of uniformity and coefficient of curvature of the subgrade gradations, which better represent the whole shape of the gradation curve, are better indicators of the effect of moisture on modulus. The SR70 A-2-4 (14% fines), A-2-4 (30% fines), Oolite A-1, Branch A-2-4 (23% fines) soils were extremely susceptible to the change of high groundwater table; the equivalent modulus reduction rates were more than 50% for lowering the base clearance from 2 ft. to 0 ft. For the Levy A-3 (4%), SR70 A-3 (8%), A-2-4 (12%), A-2-4 (24%), and Spring Cemetery A-2-4 (15%) soils, the reduction rates were also very significant for the base clearance from 2 ft. to 0 ft. with the equivalent modulus reduction rates in the range of 21% to 45%.
  • Format:
    MPEG
  • Funding:
    FDOT BD453-13
  • Collection(s):
  • Main Document Checksum:
  • Download URL:
  • File Type:

Supporting Files

  • No Additional Files
More +

You May Also Like

Checkout today's featured content at rosap.ntl.bts.gov