Abstract
This study investigates the compressive strengths of concrete cubes and reinforced columns cast with partial replacement of cement using 0- 25 wt.% Aluminum dross (AlDr) and cured in Lagoon water for 7-42days and 1-6 months respectively. The results indicated cubes with 5 wt.% AlDr, 10 wt. % AlDr and control possess strength of 15N/mm2,14.59N/mm2 and 13.48N/mm2 respectively at 28-day curing while at 42-day the results are 16.89N/mm2, 12.22N/mm2 and 16.96N/mm2 for control, 5 and 10 wt.% AlDr respectively. The 42-day compressive strength (79.48%) confirmed the performance at 28-day strength (75%). Control cube (74.6-95.5%) has higher crystallinity compared to cement (65.1-90.1%) and AlDr (62.4-74.0%) but at 15 wt.% AlDr concrete the crystallinity (78.1-96.2%) is superior with marginal crystal sizes variation (12.8-16.9). The strength (~9.5 N/mm2) with 10 wt. % AlDr column cured for 6 months was better than the control columns environment (~7 N/mm2) at 2-month.
Highlights
The world cement production is over 4 billion tons and this accounts for the third largest source of carbon dioxide after fossil fuels and land –use changes respectively
This may be attributed to the reaction of metallic aluminium in dross in the presence of moisture to form film of aluminium hydroxide, which has cementitious characteristics
In this study the compressive strength to failure tests were conducted on concrete cubes with partial cement replacement by Aluminum dross (AlDr) and cured in lagoon water at 7, 14, 21, 28 and 42 days
Summary
The world cement production is over 4 billion tons and this accounts for the third largest source of carbon dioxide after fossil fuels and land –use changes respectively. This contributes to greenhouse effects and acid rain with emission of SO2, NOx (Nitrous Oxide) (Valipour, 2014). Reddy and Neeraja (2016) replaced cement partially with secondary aluminium dross and found that compressive strength responses are comparable with the conventional concrete up to 15 wt.% AlDr. On the other hand, the use of concrete takes place both on land and in marine environment. Structures close to sea and lagoon water areas like bridges and buildings whether residential or commercial /institutional like University of Lagos, Nigeria location are prone to pitting corrosion
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