TY - GEN
T1 - A comparative study of soluble sulfate measurement techniques
AU - Talluri, Nagasreenivasu
AU - Gaily, Ahmed
AU - Puppala, Anand J.
AU - Chittoori, Bhaskar
PY - 2012
Y1 - 2012
N2 - Sulfate heave in chemically treated soils has been recognized as a major concern in pavement construction projects. Sulfate measurements on pavement subgrade soils are an important step in designing an appropriate soil stabilization scheme. Various methods have been developed for measuring soluble sulfates based on gravimetric and turbidity procedures. Variations have been observed in measuring soluble sulfate levels among these methods, hence a need arises to compare and validate each of these methods. In the present paper a comparative study of three methods namely AASHTO method, modified UTA method and TxDOT method is made for determining soluble sulfates of natural clayey soils. Two natural clayey soils are mixed with known amounts of sulfates in the form of sodium sulfate at four different concentrations of 1500, 3000, 5000 and 10000 ppm. Measurement of soluble sulfates is carried out using the above three methods. Test results are fully analyzed and evaluated for repeatability of each method in measuring true amounts of sulfates in soils. Methods are also evaluated in providing realistic measurements with respect to sulfate levels.
AB - Sulfate heave in chemically treated soils has been recognized as a major concern in pavement construction projects. Sulfate measurements on pavement subgrade soils are an important step in designing an appropriate soil stabilization scheme. Various methods have been developed for measuring soluble sulfates based on gravimetric and turbidity procedures. Variations have been observed in measuring soluble sulfate levels among these methods, hence a need arises to compare and validate each of these methods. In the present paper a comparative study of three methods namely AASHTO method, modified UTA method and TxDOT method is made for determining soluble sulfates of natural clayey soils. Two natural clayey soils are mixed with known amounts of sulfates in the form of sodium sulfate at four different concentrations of 1500, 3000, 5000 and 10000 ppm. Measurement of soluble sulfates is carried out using the above three methods. Test results are fully analyzed and evaluated for repeatability of each method in measuring true amounts of sulfates in soils. Methods are also evaluated in providing realistic measurements with respect to sulfate levels.
KW - Soil stabilization
KW - soluble sulfates
KW - sulfate measurement
UR - http://www.scopus.com/inward/record.url?scp=84888388562&partnerID=8YFLogxK
UR - http://dx.doi.org/10.1061/9780784412121.345
U2 - 10.1061/9780784412121.345
DO - 10.1061/9780784412121.345
M3 - Conference contribution
AN - SCOPUS:84888388562
SN - 9780784412121
T3 - Geotechnical Special Publication
SP - 3372
EP - 3381
BT - GeoCongress 2012
T2 - GeoCongress 2012: State of the Art and Practice in Geotechnical Engineering
Y2 - 25 March 2012 through 29 March 2012
ER -