Abstract
This study examined the effect of ferric iron inherent in mixing water on the compressive strength of concrete. Portland Limestone Cement was considered in the production of the 150mm concrete cube samples. Dirt free river sand and crushed stone with maximum size of 14mm was used as fine and coarse aggregate respectively. The water samples used for the study were sourced from the following locations as stated: Sample 1: Niger Delta University Portable water at Niger Delta University Campus, Wilberforce Island (labelled P1). Sample2: Raw water from borehole at Niger Delta University Campus, Wilberforce Island and allowed to oxidized about 3 hours. Sample 3: Raw water from borehole at Amassoma in southern Ijaw Local Area, Bayelsa state and allowed to oxidized for about 3 hours. Sample 4: Oxidized water from Ogobiri in Sagbama Local Area, Bayelsa state. Sample 5: Oxidized water from Azikoro in Yenagoa Local Area, Bayelsa state. 150mm x 150mm concrete cubes samples were prepared with the various water samples stated above. A mix ratio of 1:11/2:3 was used for this experimental study. The samples were cured in accordance with BS EN 12390-2. Compressive strength values were determined for all specimens by means of a compression testing machine. Samples were tested to failure at 7, 14, 21 and 28days. The concrete compressive strengths test results for 7, 14, 21, and 28 days for sample 1 was 24.22 N/mm2, 27.63 N/mm2, 34.04 N/mm2 and 34.59N/mm2. For sample 2 was 18.79 N/mm2, 23.55 N/mm2, 27.30 N/mm2 and 28.59N/mm2, for sample 3 was 21.12 N/mm2, 22.81 N/mm2, 25.19 N/mm2 and 26.56N/mm2, for sample 4 was 19.80N/mm2, 22.71N/mm2, 26.80N/mm2 and 27.40N/mm2and for sample was 20.89N/mm2, 21.88 N/mm2, 26.20 N/mm2 and 27.30N/mm2respectively. The test results, show a noticeable decrease in compressive strength of concrete cubes cast with water that contained ferric iron when compared with water free from ferric iron. It was concluded that Ferric iron as impurities in mixing water have significant effect on the strength of concrete.
Highlights
Concrete is one of the most durable construction materials, which constitutes Portland Lime Stone cement, fine and coarse aggregates, water, and chemical admixtures
This investigation was carried out to evaluate the effect of ferric iron present in mixing water on compressive strength of concrete
The following conclusions are drawn based on the findings of the study: Ferric iron presence in mixing water reduces the concrete comprehensive strengths
Summary
Concrete is one of the most durable construction materials, which constitutes Portland Lime Stone cement, fine and coarse aggregates, water, and chemical admixtures. The appropriateness of water can be known from previous researched to performance limits such as compressive strength and durability test. Lea, [3] stated that, pure water decomposes the set cement compounds, by liquefying the lime and alumina as of cement. (Pb+) present in mixing water on compressive strength, setting times, soundness and sodium sulfate attack of high strength cement mortar. On judgment with reference samples, at higher concentrations of lead in water, test samples had shown substantial loss of strength, and their setting times had significantly increased. Specific consideration was given on various borehole waters used for concrete mix in Amassoma, Ogobiri and Yenagoa including the campus of Niger Delta University Wilberforce Island, Bayelsa State Nigeria. The water from the research area from boreholes contains large doses of iron
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