This paper presents the findings of an investigation on calcium carbide waste (CCW) as additive in concrete and its effect on durability. The CCW used was sourced from a local panel-beating workshop. It was sundried and sieved through a 75 μm sieve and characterized by X-Ray Fluorescence (XRF) analytical method. The compressive strength of CCW-Concrete was investigated at CCW additions of 0, 0.25, 0.5, 0.75 and 1.0 %, respectively by weight of cement. A total of sixty number 150 mm cubes of CCW-Concrete of 1: 2: 4 mix and water-cement ratio of 0.5 were tested for compressive strength at 3, 7, 28 and 56 days of curing in accordance with standard procedures. Fifteen number 150 mm cubes were also tested for water absorption after curing for 28 days in water. Fifteen number 150 mm cubes were also cured in clean water for 28 days before exposed to attack from 10 % concentration of sulphuric acid and hydrochloric acid solution, respectively for 28 days and tested in compression. The concrete compressive strength in acidic solution was also modeled using Minitab statistical software. The results of the investigations showed that CCW was predominantly of calcium oxide (95.69%) and a combined SiO2, Al2O3 and Fe2O3 content of 3.14%. Addition of up to 0.5% CCW increased the compressive strength of concrete. CCW addition however decreased the resistance of concrete exposed to acidic environment and water ingress. The models of compressive strength for CCW-concrete in acidic environment were developed with R2 values of 0.816 and 0.807, and could be used to predict concrete compressive strength exposed to acidic environment.
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