Studying the Feasibility of Using Roller Compacted Concrete with Partial Replacement of Cementitious Materials by Cement Kiln Dust in Airport Aprons
Abstract
Roller compacted concrete (RCC), is known as, concrete compacted by roller compaction that, in its unhardened state, will support a roller while being constructed. RCC is a reliable material used successfully in the construction of heavy-duty low speed pavements.
The aim of this research was to study the characteristics of RCC in which, different percentages (0, 5, 10 and 20) % of cementitious materials (CMs) were replaced by cement kiln dust (CKD).
. The results indicated that the mechanical properties of the RCC control mix (with 0 % CKD) fulfilled the requirements of concrete used for airport pavements. It was proved that the RCC specimens in which 5% of the CMs (6.67 % of cement) was replaced by CKD possessed the best properties in comparison with other specimens with 10, and 20% replacement percentages. The study showed that the RCC with 5%, partial replacement of CMs by CKD could fulfill the requirements of the surface layer of airport apron pavements, while RCC with 10% replacement could be used for the construction of subsurface layers of these pavements. A new usage of RRC was confirmed, lowering the negative environmental impact of CKD, and achieving the production of sustainable pavements in airports,.