The properties of lightweight geo-materials have been studied. The available studies, however, are not sufficient to determine their dynamic properties. This paper focuses on the effect of cyclic loading on air foam-cement treated soil (ACS). The behavior of ACS subjected to cyclic loading was variable during the initial 10 loading cycles and with a cyclic stress level exceeding 0.4. The strength did not seem to change, and the modules of deformation became greater in the static triaxial compression test after cyclic loading whenever the ACS failed during cyclic loading. The failed specimen ratio during cyclic loading became greater with increasing the cyclic stress level.
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