Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5468828 | Applied Clay Science | 2017 | 14 Pages |
Abstract
Results showed that the SWP of the Belle Fourche clay (B) decreased significantly with addition of lime 4% by dry weight of soil from 235Â kPa to almost 0Â kPa. Mixing fly ashes also reduced the SWP to 47Â kPa and 100Â kPa with class C and class F fly ashes, respectively. Increase in F-T cycles reduced the SWP, whereas the SWP increased with 2 and 4 F-T cycles for the mixtures with the fly ashes. However, after 4Â cycles, the pressure of the same mixtures decreased. On the contrary, to the clay-fly ash mixtures, F-T did not affect the SWP of the clay-lime mixtures. In terms of strength, chemical treatment increased UCS. The overall effectiveness of the treatment under the curing and F-T was in the order of FC, lime, and FF. The UCSs of the clays treated with these additives were 3.58, 1.82, and 1.63 times higher than the non-treated clay. F-T reduced the UCS of the clay and the clay treated with FF. Although the UCS of the FC and lime mixtures increased within 2Â cycles of F-T, they did not show the same strength improving performance with more F-T cycles. It was observed that mixtures with higher liquid limit and plasticity index (PI) tended to have higher SWP and lower UCS. This study claimed that chemically stabilized soils with high CaO content, CaO/SiO2, CaO/Al2O3, and CaO/(SiO2Â +Â Al2O3) ratios had higher potential to decrease SWP of expansive soils and increase UCS of weak soils.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geochemistry and Petrology
Authors
Mustafa Dayioglu, Bora Cetin, Soonkie Nam,