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CHAPTER 3
Laboratory Testing Program
Introduction I. Important CLSM properties
· Flow
The key objectives of the laboratory component of · Setting time
this project were to identify the most important CLSM · Unconfined compressive strength
properties affecting performance in the four target appli- · Corrosion
cations (backfill, utility bedding, void fill, and bridge II. Potentially important CLSM properties
approaches), to develop and recommend a suite of test · Excavatability
methods to assess these properties, and to understand what · Subsidence
CLSM characteristics (e.g., materials, mixture proportions) · Freezing and thawing
most impact performance. This chapter summarizes the · Segregation and bleeding
key findings of the laboratory study performed under · Triaxial shear
NCHRP Project 24-12(01) and is aimed at meeting the above · CBR
objectives. · Resilient modulus
Information on the research approach, constituent mate- · Water permeability
rials, mixture proportions, and test methods are described · Drying shrinkage
in this chapter. A more comprehensive summary of this lab- · Leaching/environmental impact
oratory testing was provided in the NCHRP Project 24- III. Less important CLSM properties
12(01) Interim Report (Folliard et al. 2001). In addition, · Direct shear strength
more detailed information on the corrosion testing and · Air/gas permeability
service life estimation models is provided in Appendix A. · Consolidation
The main findings of this laboratory component, coupled · Thermal conductivity
with the field testing program (Chapter 4), led to the devel-
opment of appropriate test methods (Appendix B), recom- The general classification of the properties by relative im-
mended specifications (Appendix C), and recommended portance, as shown above, was then used in developing the
practices (Appendix D). laboratory testing program described in this chapter, result-
ing in significant efforts being placed on evaluating the
"important" properties, less emphasis being placed on the
Research Approach "potentially important" properties and no laboratory testing
centered on the "less important" properties. Information on
As a precursor to the laboratory program, the important specific materials and mixture proportions is provided next,
(or potentially important) CLSM properties were identified followed by discussion on the overall testing matrix, which
that may impact performance in the four target applications. was developed using the classification of the CLSM properties
These properties are identified in Table 3.1. by relative importance.
Based on the application-specific properties listed in Table 3.1
and combined with a synthesis of available literature, a gen-
Materials
eral classification of CLSM properties was developed, whereby
the various CLSM properties of interest were grouped into A range of materials, summarized in Table 3.2, was selected
three categories (important, potentially important, and less for inclusion in the laboratory study to ensure widespread
important): applicability of test results. General information about the
