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Durability and strength assessment of copper slag concrete



Author(s): D. M. Boakye, H. C. Uzoegbo
Paper category: Workshop
Book title: RILEM International workshop on performance-based specification and control of concrete durability
Editor(s): D. Bjegović, H. Beushausen, M. Serdar
ISBN: 978-2-35158-135-3
e-ISBN: 978-2-35158-136-0
Pages: 647 - 654
Total Pages: 8
Language: English


Abstract: 
This paper presents results of a research project into the effect of using pulverised copper slag (CS) as partial replacement of Portland cement (PC) in the order of 0, 2.5, 5, 10 and 15% on the strength and durability of conventional concrete. Test performed included XRF oxide composition, setting time, compressive strength, oxygen permeability, water sorptivity and chloride conductivity.
In comparison with the chemical composition of natural pozzolans, the summation of the three oxides (silica, alumina and iron oxide) in copper slag was nearly 72%, which exceeds the 70% percentile requirement for Class F raw and calcined natural pozzolans. Therefore, copper slag is expected to have good potential to produce high quality pozzolan.
In assessment of the hydraulic properties of slags, the hydraulic activity index of the copper slag was approximately 0.66, less than the recommended requirement to be used as constituent for cement. As expected, there was observed a delayed in the initial and final setting time of cement pastes as the substitution level of the copper slag increases. The results of the compressive strengths showed a reduction of the copper slag concrete compared to control samples. However, for all percentage replacement of Portland cement with copper slag, the samples generally performed better in all the three durability tests.


Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00