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Title: Influence of the composition of cement kiln dust on its interaction with fly ash and slag

Cement kiln dust (CKD), a by-product of the cement industry, contains significant amounts of alkali, free lime, chloride and sulfate. Wide variation reported in the chemical composition of CKDs limits their potential application as a sustainable binder component in concrete. In the current study, the performance of two different CKDs as components in a novel binder is evaluated. Several binders are developed by blending CKDs with fly ash or slag. Binders with 70% CKD were prepared at a water-to-binder ratio of 0.4, and heat-cured at 75 °C to accelerate the strength development. The hydration progress was monitored using X-ray diffraction, and morphological examination was performed using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Ettringite and calcium aluminosilicate hydrate (C-A-S-H) were identified as the main hydration products in the hardened binder system. Strength development of CKD-based binder was found to be significantly influenced by its free lime and sulfate contents. -- Highlights: •Interaction of cement kiln dust with fly ash and slag was explored. •CKD with higher free lime and sulfate content increased the strength of binder. •C-S-H like reaction gel with fibrillar morphology is observed in CKD-based binders.
Authors:
 [1] ;  [2]
  1. Department of Civil and Environmental Engineering, University of Illinois, Urbana-Champaign, IL 61801 (United States)
  2. Department of Civil and Environmental Engineering, Clarkson University, Potsdam, NY 13699 (United States)
Publication Date:
OSTI Identifier:
22220827
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 54; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BINDERS; CALCIUM; CEMENT INDUSTRY; CEMENTS; CHEMICAL COMPOSITION; CONCRETES; DUSTS; FLY ASH; INTERACTIONS; SCANNING ELECTRON MICROSCOPY; SLAGS; SULFATES; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION