This work studied the use of metallurgical wastes as fine aggregate replacement for the production of high strength concrete (HSC). This will offer greater benefits in promoting material greenness and natural resource conservation. The wastes were graded to meet concrete application.250 g, 500 g and 750 g of wastes aggregate were made to replace laterite in concrete mixes. The Uniaxial Compressive Strength (UCS) revealed that the concrete mix containing varying grams of the wastes have higher strength values than laterite as aggregate. Therefore, steel slag (SS) and ironore tailings (IOT) have good potential in the production of HSC. The UCS of the concrete block made with IOT increased with increasing proportion of IOT in the mixes giving 40.0, 42.5, and 44.5 MPa however SS strength drops sharply at 750 g replacement giving 44.5, 47 and 33.3 MPa respectively.In another test, the wastes were made to replace the fine aggregate by 50 % and 100 % by wt. The UCS after 21 days of curing was 43.5 and 47.5 MPa for IOT, while for SS are 40.8 and 30 MPa. UCS of mixture containing only laterite and gravel was 28.3 MPa. Optimal ratio of SS to fine aggregateis obtained at 1:5 while IOT ratio is 1:3.
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