Abstract
A combined laboratory and field study was undertaken to assess the suitability of pile run chat as a roadway base material. Chat is mine tailings from the abandoned mines in the Tri-State Mining District involving Oklahoma, Kansas and Missouri. The chat does not have any cohesion and consequently no compressive strength in unconfined form. In this study, pile run chat was stabilized with 10% class C fly ash (CFA) and 10% cement kiln dust (CKD), separately. Results from the laboratory study showed an appreciable increase in the unconfined compressive strength (UCS) and elastic modulus of pile run chat due to cementitious stabilization. CFA stabilized specimens exhibited higher strength than the CKD stabilized specimens. Results from the field tests, namely, Spectral Analysis of Surface Waves (SASW) and Falling Weight Deflectometer (FWD), showed that stabilized chat base layer perform well as part of a pavement structure. It was also found that the field modulus of elasticity, determined from both SASW and FWD, of CFA-stabilized chart base layer were higher than the corresponding values of CKD-stabilized chat base layer.
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