01657874

Component

Locally available soils are generally used as subgrade layer materials to decrease the construction cost. However, most of these soils do not perform well. Low quality local soils can be turned into better materials by improving their engineering properties via chemical soil stabilization. Class C fly ash has been used for chemical soil stabilization for a very long time. However, its popularity in the cement industry sometimes affects its availability and causes temporary shortages. In this research, lime sludge obtained from a water treatment plant was investigated as an alternative stabilizer due to the benefits of using waste materials and the uncertain future of class C fly ash. For this purpose, lime sludge was used alone and with class C fly ash to stabilize silty loess soil which is locally available in the State of Iowa. Unconfined compressive strength (UCS) and freeze-thaw (F-T) tests were conducted.The UCS test results of the specimens that were cured up to 90 days showed that lime sludge can be used alone to increase the strength of loess soil. The UCS test results of 7-day cured specimens pointed out that lime sludge can be mixed with class C fly ash to increase the strength of loess soil. However, F-T test results showed that there were no considerable benefits of using lime sludge either alone or with class C fly ash to increase the durability of loess soil against F-T action.

This paper was sponsored by TRB committee AFP40 Standing Committee on Geo-Environmental Processes.

18-03474

English

4p

2018

Transportation Research Board 97th Annual Meeting

Digital/other

References

Calcium oxide; Fly ash; Lime fly ash; Sludge (Deposit); Soil lime mixtures; Soil stabilization; Subgrade (Pavements); Subgrade materials

Iowa

Geotechnology; Highways; Materials; Pavements

Transportation Research Board Annual Meeting 2018 Paper #18-03474

TRIS, TRB, ATRI

Jan 8 2018 10:51AM