National Academies Press: OpenBook
Page i
Suggested Citation:"Front Matter." National Academies of Sciences, Engineering, and Medicine. 2009. Recommended Practice for Stabilization of Subgrade Soils and Base Materials. Washington, DC: The National Academies Press. doi: 10.17226/22999.
×
Page R1
Page ii
Suggested Citation:"Front Matter." National Academies of Sciences, Engineering, and Medicine. 2009. Recommended Practice for Stabilization of Subgrade Soils and Base Materials. Washington, DC: The National Academies Press. doi: 10.17226/22999.
×
Page R2
Page iii
Suggested Citation:"Front Matter." National Academies of Sciences, Engineering, and Medicine. 2009. Recommended Practice for Stabilization of Subgrade Soils and Base Materials. Washington, DC: The National Academies Press. doi: 10.17226/22999.
×
Page R3
Page iv
Suggested Citation:"Front Matter." National Academies of Sciences, Engineering, and Medicine. 2009. Recommended Practice for Stabilization of Subgrade Soils and Base Materials. Washington, DC: The National Academies Press. doi: 10.17226/22999.
×
Page R4
Page v
Suggested Citation:"Front Matter." National Academies of Sciences, Engineering, and Medicine. 2009. Recommended Practice for Stabilization of Subgrade Soils and Base Materials. Washington, DC: The National Academies Press. doi: 10.17226/22999.
×
Page R5
Page vi
Suggested Citation:"Front Matter." National Academies of Sciences, Engineering, and Medicine. 2009. Recommended Practice for Stabilization of Subgrade Soils and Base Materials. Washington, DC: The National Academies Press. doi: 10.17226/22999.
×
Page R6
Page vii
Suggested Citation:"Front Matter." National Academies of Sciences, Engineering, and Medicine. 2009. Recommended Practice for Stabilization of Subgrade Soils and Base Materials. Washington, DC: The National Academies Press. doi: 10.17226/22999.
×
Page R7

Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

ACKNOWLEDGMENT This work was sponsored by the American Association of State Highway and Transportation Officials (AASHTO), in cooperation with the Federal Highway Administration, and was conducted in the National Cooperative Highway Research Program (NCHRP), which is administered by the Transportation Research Board (TRB) of the National Academies. COPYRIGHT PERMISSION Authors herein are responsible for the authenticity of their materials and for obtaining written permissions from publishers or persons who own the copyright to any previously published or copyrighted material used herein. Cooperative Research Programs (CRP) grants permission to reproduce material in this publication for classroom and not-for-profit purposes. Permission is given with the understanding that none of the material will be used to imply TRB, AASHTO, FAA, FHWA, FMCSA, FTA, Transit Development Corporation, or AOC endorsement of a particular product, method, or practice. It is expected that those reproducing the material in this document for educational and not-for-profit uses will give appropriate acknowledgment of the source of any reprinted or reproduced material. For other uses of the material, request permission from CRP. DISCLAIMER The opinion and conclusions expressed or implied in the report are those of the research agency. They are not necessarily those of the TRB, the National Research Council, AASHTO, or the U.S. Government. This report has not been edited by TRB.

i TABLE OF CONTENTS ACKNOWLEDGMENTS………………………………………………………………………..V ABSTRACT……………………………………………………………………………………..VI EXECUTIVE SUMMARY……………………………………………………………………..VII INTRODUCTION .......................................................................................................................... 1 MECHANISMS OF STABILIZATION ........................................................................................ 2 TRADITIONAL STABILIZERS ......................................................................................................... 2 BY-PRODUCT STABILIZERS .......................................................................................................... 4 NON TRADITIONAL STABILIZERS ................................................................................................. 5 SOIL CLASSIFICATION .............................................................................................................. 5 SOIL EXPLORATION................................................................................................................... 7 PRELIMINARY DATA COLLECTION ............................................................................................... 7 SUBSURFACE INVESTIGATIONS .................................................................................................... 7 Sampling Plan ...................................................................................................................................... 8 Sampling of Soils ................................................................................................................................. 8 Frequency and Depth of Sampling ....................................................................................................... 8 GUIDELINES FOR SOIL STABILIZATION ............................................................................... 9 GUIDELINES FOR STABILIZER SELECTION .................................................................................. 11 Lime Stabilization .............................................................................................................................. 11 Cement Stabilization .......................................................................................................................... 12 Fly Ash Stabilization .......................................................................................................................... 12 TECHNIQUES FOR STABILIZER SELECTION ................................................................................. 13 ADDITIONAL TESTS INVOLVED IN STABILIZER SELECTION ........................................................ 15 VALIDATION OF STABILIZER SELECTION ......................................................................... 15 LIME STABILIZATION FOR SOILS ................................................................................................ 15 Mix Design Considerations ................................................................................................................ 15 LIME TREATMENT OF BASE COURSES ........................................................................................ 18 CEMENT STABILIZATION ............................................................................................................ 19 Mix Design Considerations ................................................................................................................ 20

ii CEMENT TREATMENT OF BASE COURSES .................................................................................. 23 FLY ASH STABILIZATION FOR COARSE GRAINED SOILS AND AGGREGATES .............................. 23 Mix Design Considerations ................................................................................................................ 24 LIME-FLY ASH TREATMENT OF SOILS TO ACHIEVE A TARGET STRENGTH ................................ 26 SUMMARY .................................................................................................................................. 28 REFERENCES ............................................................................................................................. 30 STANDARD RECOMMENDED PRACTICE FOR STABILIZATION OF SUBGRADE SOILS AND BASE MATERIALS ........................................................................................................... 30

iii LIST OF FIGURES Figure 1. Guideline for Stabilization of soils & base materials for use in pavements…….. 10 Figure 2. Decision tree for selecting stabilizers for use in subgrade soils …… 13 Figure 3. Decision tree for selecting stabilizers for use in Base materials …… 14

iv LIST OF TABLES Table1. Guideline regarding spacing between sampling locations …….. 8 Table 2. Compressive strength recommendations for lime stabilized sections …….. 18 Table 3. Cement requirement for AASHTO soil Groups …….. 20 Table 4. Range of compressive strength in soil cements …….. 22 Table 5. U.S Army Corps of Engineers unconfined compressive strength criteria …….. 22

v ACKNOWLEDGMENTS The research reported herein was performed under NCHRP Project 20-07 by the Texas Transportation Institute, Texas A&M University. The Texas Transportation Institute was the contractor for this study. Dallas N. Little, E.B. Snead Chair Professor, Texas A&M University, was the principal investigator. The author of this report is Syam Nair, Graduate Research Assistant, Texas Transportation Institute. The work was done under the general supervision of Dr. Dallas Little.

Next: ABSTRACT »
Recommended Practice for Stabilization of Subgrade Soils and Base Materials Get This Book
×
MyNAP members save 10% online.
Login or Register to save!
Download Free PDF

TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 144: Recommended Practice for Stabilization of Subgrade Soils and Base Materials explores a methodology to determine which stabilizers should be considered as candidates for stabilization for a specific soil, pavement, and environment.

  1. ×

    Welcome to OpenBook!

    You're looking at OpenBook, NAP.edu's online reading room since 1999. Based on feedback from you, our users, we've made some improvements that make it easier than ever to read thousands of publications on our website.

    Do you want to take a quick tour of the OpenBook's features?

    No Thanks Take a Tour »
  2. ×

    Show this book's table of contents, where you can jump to any chapter by name.

    « Back Next »
  3. ×

    ...or use these buttons to go back to the previous chapter or skip to the next one.

    « Back Next »
  4. ×

    Jump up to the previous page or down to the next one. Also, you can type in a page number and press Enter to go directly to that page in the book.

    « Back Next »
  5. ×

    To search the entire text of this book, type in your search term here and press Enter.

    « Back Next »
  6. ×

    Share a link to this book page on your preferred social network or via email.

    « Back Next »
  7. ×

    View our suggested citation for this chapter.

    « Back Next »
  8. ×

    Ready to take your reading offline? Click here to buy this book in print or download it as a free PDF, if available.

    « Back Next »
Stay Connected!