Abstract
This research aimed to clarify the role of by-product materials, such as CKD with SF as partial replacement by weight of cement in concrete manufacturing and inclusion on different characteristics of concrete. Concrete test specimens were mixed with 0%, 5%, 10%, 15%, 20% and 25% (CKD) with 15% (SF) as partial replacement by weight of Cement (CEM I-52.5N). Fresh concrete properties have been evaluated by workability measurement slump test. While hardened concrete properties have been evaluated by compressive, split tensile and flexural strengths tests at ages 7, 28 and 56 days, but evaluated for bond strength, modulus of elasticity and chemical composition measurement with X-Ray Fluorescence at age of 28 days. The test results have revealed that the increase of CKD amount with fixed amount of SF in concrete mixtures as partial replacement by weight of cement leads to gradual decrease of fresh concrete workability. In concrete mixtures, 20% CKD in the presence of 15% SF as partial replacement by the weight of cement are the optimum ratios which can be used without any negative effect on mechanical properties compressive, indirect tensile, flexural and bond strength at all the ages of concrete. Also modulus of elasticity and bond strength increased by 8.81% and 0.69% respectively at the age 28 days compared with control mixture.
Highlights
Cement Kiln Dust (CKD) is an industrial by-product material during cement manufacturing that is not returned to the process but disposes of them by landfill
The test results have revealed that the increase of CKD amount with fixed amount of silica fume (SF) in concrete mixtures as partial replacement by weight of cement leads to gradual decrease of fresh concrete workability
Silica fume is an industrial by-product material derived during production of elemental silicon where it is defined as an alloy containing silicon; its noncrystalline silica is very fine which is produced in electric arc furnaces [1]
Summary
CKD is an industrial by-product material during cement manufacturing that is not returned to the process but disposes of them by landfill It was found from the experimental tests and previous research, the utilization of CKD individually as the partial replacement of cement in concrete leads to decreases in all types of strength. The use of CKD as a partial replacing of cement possible in the combination with pozzolanic materials in the certain mortar mixed designs without decreasing in the main characteristics of the product [3]. The pozzolanic material such as SF is an ultra-fine powder and very reactive pozzolana; it is used in concrete because of its fine particles, large surface area and higher SiO2 content [4]. One part of cement can be replaced with 0.25 to 0.33 part of silica fume (mass to mass) without losing in the strength, provided the content of water remains constant [6]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Minerals and Materials Characterization and Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
