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Abstract:Samples of pebble quicklime were obtained from each of the six major
lime producers' plants in Texas. These samples were used for laboratory
testing which determined chemical composition of the dry lime, physical
properties of slurries prepared from the quicklime, and reaction properties
of the lime with soil.
Preparation of slurries with the six materials using the same methods
and material quantities yielded viscosities ranging from 13 to 165 poises
at 77 F with solids contents between 28.5 and 32.4 percent solids.
Adjustment of the high viscosity slurries to the range of 25-30 poises
resulted in solids contents between 18.5 and 26.0 percent.
Wet sieve analyses of slurries prepared using two methods were performed.
Residues retained on the No. 6 and No. 30 screens were weighed. Residues
on the No. 30 ranged from 5.5 to 32.8 percent using the standard test
method and 1.2 to 10 percent using a different slurrying method.
Quicklime/soil mixes were prepared and subsequently compacted into 4 x 6
cylinders and cured under moist conditions. These cylinders were tested
at intervals for compressive strength and unreacted lime content. These
tests showed no consistent difference in the stabilizing performance of
the different producers' materials. Samples prepared using quicklime
passing the 1/4-inch sieve and hydrated lime showed more stabilizing
effect than the coarsely graded quicklime.
Recommendations for changes to the existing lime specification and test
procedures are made within this report. It is recommended that the residue
requirement for the No. 30 sieve be removed and the limit for the No. 6
sieve be lowered. It is also recommended that a separate grade of quicklime
be established solely for slurrying purposes which has no limit on
fines content.
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