Title page for ETD etd-05072002-155528

Type of Document Master's Thesis
Author Jacobson, Jesse Richard
Author's Email Address jjacobso@vt.edu
URN etd-05072002-155528
Title Factors Affecting Strength Gain and Development of a Laboratory Testing Procedure
Degree Master of Science
Department Civil Engineering
Advisory Committee
Advisor Name Title
Filz, George M. Committee Chair
Mitchell, James K. Committee Co-Chair
Brandon, Thomas L. Committee Member
  • strength gain
  • laboratory mix design
  • lime-cement columns
Date of Defense 2002-05-02
Availability unrestricted
Lime-cement columns were constructed to improve soft ground at the I-95/Route 1 Interchange in Alexandria, Virginia. As part of the test embankment program, two different commercial laboratories performed laboratory tests on treated soil, and they produced strikingly different unconfined compression test results. Further, both sets of results are different from test results for similar soils available in the published literature. This situation created uncertainties and a conservative design philosophy, accompanied by increased construction costs compared to typical lime-cement column projects. The goals of this research project were to assess factors that influence strength gain of lime-cement-soil mixtures and to develop a detailed laboratory test procedure that produces consistent results. Key findings from the research are that a laboratory test procedure that produces consistent results has been developed, drying and subsequent restoration of soil moisture prior to treatment can decrease the strength of the mixture, the mixture strength decreases as the ratio of soil water content to cement content increases for 100 percent cement-soil mixtures, the addition of lime can increase the mixture strength for some soils and decrease the strength for others, and presenting the test results in the form of contour plots of unconfined compressive strength can be very useful.
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