Strength property of unbound aggregate is critical for designing base and subbase layer thicknesses. Unsoaked California bearing ratio (CBR) is commonly used by the state agencies in quality control and design. However, depending on the amount of fines content (i.e. passing No. 200 sieve), the strength characteristics of unbound aggregate layers may severely be impacted after soaking. This study investigates the correlation between soaked and unsoaked strength for crushed gravel and limestone aggregates. The effects of including 5% and 12% fines content, 5% and 9% plasticity index (PI), and 0.4, 0.6 and 1.0 dust ratio (DR) on aggregate strength was also considered. DR is the ratio of percent passing No. 200 sieve to percent passing No. 40 sieve. Most of the configurations with 5% fines content were not sensitive to soaking in terms of CBR index. However, a significant reduction in soaked and unsoaked CBR values were observed when fines content increased from 5% to 12% and specially for configurations with DR value of 0.4 and 5% PI. The crushed limestone aggregates were affected more by soaking than the crushed gravel aggregates. A prediction model was proposed to predict soaked CBR values from unsoaked CBR tests considering material type, fines content, plasticity index and dust ratio.
|Commitee:||Cross, Brad, Fries, Ryan|
|School:||Southern Illinois University at Edwardsville|
|School Location:||United States -- Illinois|
|Source:||MAI 57/01M(E), Masters Abstracts International|
|Subjects:||Engineering, Civil engineering|
|Keywords:||Dust ratio, Fines content, Plasticity index, Soaked CBR, Unbound aggregate, Unsoaked CBR|
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