Corrosion studies of Self Compact Concrete with dilute Hydrochloric Acid in Chemical Industries
Appanna Babu.Gunta
Appanna Babu.Gunta, Department of Chemical Engineering, Dire Dawa Institute of Technology, Dire Dawa University, Dire Dawa – 1362, Ethiopia.
Manuscript received on December 02, 2016. | Revised Manuscript received on December 24, 2016. | Manuscript published on December 25, 2016. | PP: 12-18 | Volume-4 Issue-7, December 2016. | Retrieval Number: F1131094616
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Abstract: Corrosion is the deterioration or destruction of material by chemical or electro chemical reaction with its environment. The effect of the effluent dilute Hydrochloric acid on self compact concrete was cured using concrete with waterbinder ratio 0.5, of after making there to shape of cubes. Silica fume content was 7.5% by weight of cement & fly ash content 17.5% by weight of cement. High range water reducing agent (HRWRA) was to ensure the better workability. For each mix sample, the effect of the variable parameters like p H value of the acid & its concentration, time of exposure, were studied. Also the effects of sea water & air on these mixes were studied. In this study the concrete cubes were exposed to hydrochloric acid (HCl) of different concentrations like (25 ppm, 50 ppm, and 100ppm), seawater, open air and pure water. The amount of acid consumed by concrete per unit surface area, variation of concrete strength and weight with time for different concentrations of hydrochloric acid was summarized. The tests revealed that self compacting concrete (SCC) cubes consumed acid, in all concentrations for 90 days, in increasing order with increase in concentration of acid, The rate of consumption of acid is higher initially and then decreases gradually with age. With 25 ppm concentration of hydrochloric acid in contact , the concrete cubes shows a slight gain in weight as well as strength where as, in all remaining concentrations Hydrochloric acid, the weight and the strength followed a decreasing trend with increase in concentration of Hydrochloric acid studied. The consumption of acid on concrete cubes increased with increase in time. The percentage decrease in strength increased with increase in the hydrochloric acid concentration. The use of both silica fume, fly ash resulted in drastic reduction in chloride permeability at all the ages.
Keywords: Compressive strength, silica fume, durability, fly ash, corrosion, and self compacting concrete.