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Sulphur polymer concretes (SPC) are widely used in construction technologies as building materials in recent years. Knowing the strength changes of SPCs used in structural members during their service life is of great importance in terms of building health. Therefore, it is aimed to determine the long-term strength changes of bitumen modified SPCs within the scope of this study. First, the sulphur modification was made using 2.5% by weight of bitumen. Modified sulphur (MS) samples were examined with DSC and SEM to see if the modification was realized. Compressive, flexural and splitting tensile strength tests were carried out on SPC samples prepared with MS at the end of 1-hour, 1-day, 7, 28 and 360 days. Traditional Portland cement concrete (PCC) was prepared to be the same as the 28-day compressive strength of SPC, and the same tests were carried out to examine the results found comparatively. It was determined that the compressive, flexural and splitting tensile strength values of SPCs at the end of 1-hour reached 78%, 86% and 84%, respectively. It was determined that while the long-term strength values of PCCs increased, the long-term strength of SPCs decreased.

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