Sekizinci Ulusal Geosentetikler Konferansı, İstanbul, Turkey, 16 - 17 May 2019, vol.1, pp.297-306
In this experimental study, 8-shaped direct tensile test and split tensile test (Brazilian test) were used to measure the tensile strength of compacted clay soil. The unconfined compressive strengths of the same clay samples were also determined. Laboratory tests were performed on Ankara clay and Kaolin clay with the addition of various proportions of synthetic polypropylene fiber, pulverized rubber, and bentonite. This usage of different stabilizing agents enabled the authors to observe the reliability of the tensile strength measurement methods when soils’ mechanical properties were significantly changed and to develop universal equations which also can be applied on stabilized soils. The data between the results of 8-shaped direct tensile tests, split tensile tests, and unconfined compression tests were correlated. The ratio of direct tensile strength to split tensile strength and to unconfined compressive strength was calculated to be 1.9 and 0.4, respectively. Also, the ratio of split tensile strength to unconfined compressive strength was calculated to be 0.2. Three empirical equations were developed according to the Ankara clay and Kaolin clay mixtures’ tensile strengths, index properties, and compaction characteristics and they were proposed to estimate the tensile strength of fine-grained soils.