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EFFECT OF USING CEMENT KILN DUST AS A NANO-MATERIAL ON THE STRENGTH OF CEMENT MORTARS
Wael Alnahhal,Ramzi Taha,Hammad Al-Nasseri,Safna Nishad 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.4
In this experimental study, the effects of using nano-sized Cement Kiln Dust (CKD) as a partial replacement for Ordinary PortlandCement (OPC) on the strength of cement mortars is investigated. The CKD was milled up to 4 hours in a planetary ball mill. Inaddition to the control cement mortar mixture with 0% CKD, a total of 28 concrete mortar mixtures were prepared with four differentreplacement percentages of nano-CKD (5, 10, 15, and 20 %), and seven different milling times (1, 1.5, 2, 2.5, 3, 3.5, and 4 hours). The compressive strengths of all cement mortar mixtures were evaluated after curing periods of 7, 28, and 56 days. In addition, thechemical, physical and microscopical properties of the nano-CKD were evaluated using Scanning Electron Microscope (SEM),Transmission Electron Microscope (TEM) and X-ray diffraction (XRD). The experimental results showed that the partialreplacement of the OPC with the nano-CKD enhanced the compressive strength of the cement mortar by about 15-30% comparedwith normal mortar without CKD. Moreover, the experimental results indicated that no change was observed in the chemicalcomposition of CKD after 4 hours of milling. However, there was a decrease in the Portlandite content in parallel with an increase inthe density and the surface area.