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Title: Copper Slag Cold-Bonded Aggregate Concrete Exposed to Elevated Temperature

Author(s): Job Thomas, Ardra Mohan, and Dhannya K. K.

Publication: Materials Journal

Volume: 117

Issue: 6

Appears on pages(s): 215-230

Keywords: copper slag fly ash aggregate; durability; prediction model; strength

Date: 11/1/2020

Abstract:
In this study, copper slag and lime-activated fly ash were used for the manufacturing of cold-bonded aggregates. Cold-bonded copper slag fly ash (CSFA) aggregates were manufactured by varying copper slag content. The aggregate type with 37.5% copper slag and 62.5% fly ash showed optimum strength properties and was selected for the production of CSFA aggregate concrete. The strength and durability properties of concrete with a varying replacement ratio of CSFA aggregate from 0 to 100% at normal temperature and at elevated temperatures of 200, 400, and 600°C were investigated. The results show that concrete containing CSFA aggregate can be ideally used as a construction material up to a temperature of 400°C and as 100% replacement for coarse aggregate. A prediction model has been formulated using multiple regression analysis for the mechanical strength properties of concrete at different replacement ratios and exposure temperatures. A mixture design methodology is also proposed for the concrete containing CSFA aggregates.


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