SYMPOSIA PAPER Published: 01 January 1992

Comparison of High Calcium, Soft Burned Dolomitic and Hard Burned Dolomitic Quicklimes for Soil Stabilization Use


A locally available clay, with an initial plasticity index of 63, was treated with high calcium, and soft and hard burned dolomitic quicklimes. The amount required for treatment was determined, using the Eades-Grimm pH test, to be 3 % for the high calcium quicklime, and 5 % for both the soft and hard burned dolomitic quicklimes. CBR (California bearing ratio) swelling and penetration tests were run on treated clay samples. The high calcium quicklime treated sample swelled 0.45 % while the soft and hard burned dolomitic quicklime treated samples swelled 1.2 and 1.3 % respectively. The CBR values were 65 for the high calcium sample and 60 and 56 for the soft and hard burned dolomitic samples.

Several tests were done to measure reaction rates of quicklime with the clay. The high calcium and soft burned dolomitic quicklimes reacted rapidly while the hard burned quicklime was somewhat slower.

A mathematical equation has been developed that defines the relationship of pH to quicklime dosage more accurately than the Eades-Grimm test method.

Temperature of the solutions at the time of the pH measurements can have a significant affect on the amount of lime required for stabilization. One illustration shows that the dosage of quicklime, as determined by the Eades-Grimm test method, could be in error by as much as 250 %.

Author Information

Oliphant, JL
Chemstar Lime Company, BMI Complex, Henderson, NV
Walker, DD
Chemstar Lime Company, BMI Complex, Henderson, NV
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Developed by Committee: C07
Pages: 23–31
DOI: 10.1520/STP15527S
ISBN-EB: 978-0-8031-5196-3
ISBN-13: 978-0-8031-1436-4