Abstract
Using additives like chemical materials have been determined to be an important procedure forimproving some properties of expansive soils. The present work had attempted to study the influence of addingvarious percentages of Polyacrylamide (PAM) polymer on the clayey expansive soil properties mixed withlime (L) and finely divided particulate Cement Kiln Dust (CKD), which is collected during the production ofPortland cement. The properties are investigated under the influence of adding many percentages ofPolyacrylamide polymer (i.e., 1%, 3% and 5%) with lime and cement kiln dust mixture of (3% lime and 8%cement kiln dust). The Atterberg limits, compaction, swelling potential, unconfined compression strength(UCS) and California Bearing Ratio (CBR) tests are carried out on the prepared samples. The results showedthat addition of Polyacrylamide (PAM) polymer with (LCKD) has improved expansive clay soil propertiesmore than adding (LCKD) alone. The optimum percentage for (LCKD-PAM) that achieves the lower free swellvalue and the maximum UCS and CBR values is at (3% L+8% CKD +5% PAM) which shows reducing in freeswell by about 94.5%, increasing in UCS worth by about 262% and 400% for curing period of 7 and 28 daysrespectively and improving CBR value to 27 from 5.45.
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