Recommendations for stabilization of high-sulfate soils in Texas
P Harris, J von Holdt, S Sebesta… - Transportation …, 2006 - journals.sagepub.com
In an effort to construct roads more quickly, high-plasticity index soils stabilized with lime are
now routinely compacted the day after mixing. With this practice has come an increasing
number of heaves due to soluble sulfates reacting with the lime to form ettringite. Soils with
sulfate concentrations below 7,000 to 8,000 parts per million (ppm) can generally be treated
with lime. This research was performed to identify stabilizers that can be used with sulfate
concentrations above 10,000 ppm. The effectiveness of the stabilizers was determined by …
now routinely compacted the day after mixing. With this practice has come an increasing
number of heaves due to soluble sulfates reacting with the lime to form ettringite. Soils with
sulfate concentrations below 7,000 to 8,000 parts per million (ppm) can generally be treated
with lime. This research was performed to identify stabilizers that can be used with sulfate
concentrations above 10,000 ppm. The effectiveness of the stabilizers was determined by …
[BUCH][B] Recommendations for stabilization of high-sulfate soils in Texas
Over the last 15 years, the Texas Department of Transportation (TxDOT) has seen an
increase in pavement failures during and immediately after construction on roads designed
to last 20 years or more. The cause of many of these failures is sulfate-induced heave where
an expansive mineral called ettringite is formed from a calcium-based stabilizer (lime or
cement) reacting with clay and sulfate minerals (usually gypsum) in the soil. Traditionally,
TxDOT has removed and replaced soils with more than 2000 ppm sulfates. Earlier in this …
increase in pavement failures during and immediately after construction on roads designed
to last 20 years or more. The cause of many of these failures is sulfate-induced heave where
an expansive mineral called ettringite is formed from a calcium-based stabilizer (lime or
cement) reacting with clay and sulfate minerals (usually gypsum) in the soil. Traditionally,
TxDOT has removed and replaced soils with more than 2000 ppm sulfates. Earlier in this …