Abstract
One of the most important properties of concrete is its strength. However, in certain circumstances, like urban sewage systems, concrete is attacked and corroded, being exposed to the sulfuric acid produced from H2S in a biological process, thereby undergoing a decrease in its strength. This paper studies the effect of concrete admixtures on surface strength of concrete in acidic environments, using Twist-Off method. In order to investigate the corrosion process in concrete and consequent decrease in its strength, the calibration curve for the partially destructive twist-off method was firstly determined. Then, 15 concrete samples mixed with air-entraining admixtures, plasticizers, and micro-silica were prepared and placed in acidic and neutral PH environments in sewer pipes and sewage treatment plant. Using twist-off method and calibration curve, surface strengths of the samples were measured in a 135-day period and compared with one another.
Highlights
The larger the cities of our country and their populations get, the more important the issue of environmental pollution becomes
The Having done the experiments discussed later in detail, the following preliminary results are drawn; Admixture-free Concrete In aeration basin number 1: The concrete strength has decreased by 2%
Discussion laboratory program Since this study introduces a laboratory method and aims to investigate the effect of wastewater on concretes without admixtures and those with admixtures, it is essential that a sufficient number of samples be prepared
Summary
The larger the cities of our country and their populations get, the more important the issue of environmental pollution becomes. Sewage, which is one of the main causes of environmental pollution, needs to be collected and removed from cities, purified, and returned to the water cycle in the nature. Sewage treatment plants and sewer pipes are mostly made of concrete. Biogenic sulfuric acid corrosion of concrete as a result of the waste present in sewers poses a problem to the sewer pipes. Following from the corrosion process, the firm structure of the concrete pipes is seriously weakened, which leads to spending huge costs on early replacement of the corroded pipes. The chief cause of the corrosion is M.I.C.C, which is a process whereby sulfuric acid is produced in sewer systems from the reaction between hydrogen sulfide (H2S) gas and Thiobacillus bacteria[1]
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