Predicting the loss in compressive strength concrete as a result of the effect of chlorides and sulfates using the Matlab program
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compressive strength concrete, chlorides, sulfates, losses, gases, Matlab program.
Abstract
The building and construction sector witnessed a civil and industrial boom and renaissance that included many areas and development sectors in residential buildings and given the presence of most of these installations in coastal areas and near the sea as well as industrial complexes and the presence of these buildings in the lands in different environments and therefore these installations are exposed to damage and erosion and recently increased problems The concrete in these buildings resulting from the influence of chlorides and sulfates, especially in areas exposed to moisture, high temperatures and gases released from industrial complexes. Combined, these conditions increase the loss of concrete's compressive strength, increase the rate of cement hydration and corrosion of concrete, and consequently damage the quality of hard and hard concrete. Since the compressive strength of concrete assesses the quality of concrete without regard to the effect of sulfates, chlorides, and harmful gases on it, it is necessary there fore to find another relationship that connects the compressive strength in concrete when it is exposed to sabotage media, including air exposed to gases and fossil areas or near the seashore to know the media that affects the loss In the strength. In this study, a laboratory study was conducted in order to know the effect of gases, moisture, and other sabotage causes that affect the loss of concrete strength as a result of these media. Therefore, samples of concrete cubes from ordinary Portland cement were prepared and tested in 28 days, 60 days, 90 days, and 365 days, subjected to conditions similar to the conditions of sabotage, compare the results with each other in terms of compressive strength of concrete, and perform chemical analyzes on them to find out the content of chlorides and sulfates. After performing laboratory tests, a relationship was linked between the content of chlorides and sulfates in the concrete with the compressive strength concrete using the MATLAB program for predicting the loss in compressive strength concrete An equation was developed linking the content of chlorides or sulfates with compressive strength to obtain the loss in compressive strength in each case exposed to concrete.
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