Using Kiln Dust to Improve Weak Subgrades for Pavement Construction: A Field Verification in Michigan, USA

Remove-and-replace with suitable material has been the primary solution used for improving subgrades in Michigan, USA, when weak are encountered road construction. Considering large extent of silty and clayey soils found southeastern where much population roads located within state, earthwork associated this is massive expensive. The use cement kiln dust (CKD) or lime (LKD) as a subgrade stabilizer can be cost-effective if there sufficient evidence to prove that such stabilization climate Michigan. This became subject field laboratory investigation carried out Michigan sponsored by Department Transportation. findings from portion research (which were published separate manuscript) proved CKD’s suitability long-term LKD’s capacity being short-term modifications study covers testing investigation. Two CKD-stabilized another two LKD-stabilized subgrades, which already 4–6 years, tested strength, using dynamic cone penetration (DCP) tests. California bearing ratios estimated DCP tests showed could offer strength gains high 200–515% 149–257% compared situ soils, respectively, even after years use.