EFFECT OF CEMENT DUST COMPOSITION AND FLY ASH INCORPORATION ON THE PHYSICAL PROPERTIES AND STRENGTH OF BLENDED CEMENT | ||||
| ERJ. Engineering Research Journal | ||||
| Article 8, Volume 31, Issue 4, October 2008, Page 377-384 PDF (450.33 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/erjm.2008.69825 | ||||
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| Author | ||||
| Sabry A. Ahmed | ||||
| Faculty of Engineering, Zagazig University, Zagazig 44519, Egypt. | ||||
| Abstract | ||||
| In this study tests were conducted with two types of blended cement; one was cement kiln dust with ordinary Portland cement (CKD-OPC) and the other was a combination of cement kiln dust and fly ash with OPC (CKD-FA-OPC). Three CKDs having different chemical compositions were collected kom three different plants and mixed with OPC to produce blended cement 5 to 50% of CKD. One of these CKDs, which satisfy the best performance in CKD-OPC blends, was used as an activator to fly ash in CKD-EA-OPC blends. In these blends the total waste materials (CKD+EA) were used as a partial replacement of 5, 10,15 and 20% of the cement content, and the CKD and'FA wewcombined at different ratios; where the percentage of CKD to the total waste ' ' materials wtis 0, 30, 50 and 70%. The blends were tested for their water requirements for normal consistency,setting times, soundness and compressive strength at 7 and 28 days age. Resdts of '' these ?;& were compared to those of OPC. It was found that the CKD with lower contents of bimi&l'b~ides (SO3, K20, Na20, Cl- and kee CaO) could be used in the production of blended cement with quantities up to 35% of the cement content. The physical properties of these blends were very close to those of OPC, and their compressive strengths were adequate. Also, when a proper CKD to FA ratio was used; the akalis kom CKD activated the hydration of FA and leading to a blend with satisfactoly performance. CKD-FA-OPC blends with 90% OPC and not more than 5% FA had physical properties and strength comparable to those of OPC. | ||||
| Keywords | ||||
| Cement kiln dust; Fly Ash; Blended cement; Chemical co'mposition; Physical properties; Compressive strength | ||||
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