ABSTRACT
Road rehabilitation and reconstruction generate large supplies of reclaimed asphalt pavement (RAP) aggregate. Recycling into asphalt paving mixtures is the predominant application. Cement by-pass dust (CBPD) or cement kiln dust (CKD) is a by-product material generated during the production of Portland Cement. This study investigated the potential use of CBPD-stabilized RAP and RAP/virgin aggregate mixtures in road bases. Compaction and unconfined compressive strength tests were conducted on RAP/virgin aggregate blends with different percentages. Specimens were cured for 3, 7 and 28 days. A CBPD content of 15% seems to be the optimum for achieving maximum strength. The optimum moisture contents for those blends stabilized using up to 7% CBPD are higher than those stabilized using 10-20% CBPD. Pavement design undertaken for the different combinations of CBPD-stabilized RAP/virgin aggregate indicated that with the increase of CBPD or virgin aggregate contents, a lower base thickness is required.
