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A laboratory study was undertaken to evaluate the effectiveness of different percentages of hydrated lime, class C fly ash (CFA), and cement kiln dust (CKD) as soil stabilizers. Cylindrical specimens were compacted and cured for 28 days in a humidity room having a constant temperature and controlled humidity. At the end of the curing period, specimens were tested for resilient modulus (Mr), modulus of elasticity (ME), and moisture susceptibility using tube suction test. The study revealed that the values of Mr, ME, and unconfined compressive strength (UCS) for the stabilized specimens increased with the increase in the amount of the stabilizing agent. It was also found that the increase in Mr, ME, and UCS values varies with the type of stabilizing agents. The CKD-stabilized specimens exhibited a higher increase in Mr, ME, and UCS values than the corresponding values of lime- and CFA-stabilized specimens. Additionally, CKD-stabilized specimens exhibited the least moisture susceptibility in terms of lowest dielectric values as compared to lime- and CFA-stabilized specimens. [ABSTRACT FROM AUTHOR]

The present study focuses on investigating the effect of freeze–thaw (FT) cycles, referred to as environmental effect in this paper, on aggregates stabilized with various stabilizing agents, namely, cement kiln dust (CKD), Class C fly ash (CFA), and fluidized bed ash (FBA). Cylindrical specimens were compacted and cured for 28 days in a moist room with a constant temperature and controlled humidity. After curing, specimens were subjected to 0, 8, 16, and 30 FT cycles, and then tested for resilient modulus (Mr). Results showed that Mr values of stabilized specimens decreased with increasing FT cycles up to 30. The reasons for such changes are explained by the increase in moisture content during thawing and the formation of ice lenses within the pores during freezing, causing distortion of the matrix of particles. It was also found that the decrease in Mr values varied with the type of stabilizing agents. The CKD-stabilized Meridian and Richard Spur aggregates exhibited a higher reduction in Mr values than the corresponding values of CFA- and FBA-stabilized specimens. The CFA-stabilized Sawyer specimens performed better than their CKD- and FBA-stabilized counterparts. [ABSTRACT FROM AUTHOR]