Experimental Investigation on the Variation in Shear Strength of Clayey Soil Reinforced with Randomly Distributed Alkali-Resistant Glass Fiber

Geotechnical investigations are one of the most crucial parts of the construction to save the time and effort spent on the projects. Particularly, in the case of the clays with high plasticity are encountered, the analysis of bearing capacity and settlement of structures such as buildings, roads, and dams governs the design. The possible solutions can be leaving the land, reaching a strong soil bypassing the weak one, removing the weak soil by replacing it with a higher strength of the material, and applying soil improvement methods. Glass fibers are one of the synthetic additives which may be used to address improving the weak soil properties. In this study, the effect of alkaline-resistant glass fiber additive on the undrained shear strength of the clayey soils was investigated. Fibers with distinct lengths were added to the natural soil at increasing rates, and the mixtures were prepared in the optimum water content. The prepared mixtures were compacted in a compaction mold with a diameter of 50 mm and a height of 100 mm with standard energy. Unconfined compression test (UC) were conducted on a total of 210 cylindrical samples, 10 of natural clay and 200 of fiber-reinforced. The maximum increase was at 0.5% of a fiber blend of 40 mm length. As a result of 210 UC tests, it was observed that the alkaline-resistant glass fiber additive increased the shear strength of the clay soil.

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[1] A. Önalp and S. Sert, Geotechnical Information III: Building Foundation, 3rd Ed. (in Turkish), İstanbul, Birsen Publishing, 2016.
[2] E. Karakan, S. Türker and A. Balanlı, “Building Materials (in Turkish)”, Yıldız Technical University, İstanbul, pp. 45-72, 1992.
[3] N. Seventekin, Chemical Fibers (in Turkish), İzmir, Research and Application Center of Textile and Apparel Manufacturing, 2001.
[4] M. Maraşlı, “Development of predicting model of bending and compressive strength with maturity method in glass fiber reinforced concrete (in Turkish)”, M.Sc. Thesis, Düzce University Institute of Science and Technology, Düzce, 2019.
[5] F. Işık, R.K. Akbulut, Ş.A. Zaimoğlu and S. Arasan, “The usability of waste natural fibers in soil improvement of clayey soil (in Turkish)”, 6th Geotechnical Symposium, Paper No: S053, Adana, 2015.
[6] M.L. Diallo and Y.S. Ünsever, “An experimental study on the stabilization of a clay soil with construction wastes and lime (in Turkish)”, Pamukkale University Journal of Engineering Sciences, vol. 26, no 6, pp. 1030-1034, Nov 2020.
[7] N. Ural, Ü. Kut and N. Gülsevinç, “Soil Improvement with Waste PVC (in Turkish)”, El-Cezeri Journal Science and Engineering, vol. 7, no. 3, pp. 1471-1481, Sep 2020.
[8] H. Bilici, D.V. Okur, M. Türköz and H. Savaş, “Comparative analysis of the effects of fly ash and blast furnace slag admixtures on the strength of clay soil”, BEÜ Journal of Science, vol. 9, no. 2, pp. 910-919, Oct 2020.
[9] G. Bilgen, “Utilization glass powder for improving strength of bentonite clay (in Turkish)”, 6th Geotechnical Symposium, Çukurova University, Adana, 2015.
[10] TS 1500, “Classification of Soil for Civil Engineering Purposes (in Turkish)”, TSI, Ankara, pp. 25-57, 2000.
[11] ASTM D2487-06, “Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System)”, 2006.
[12] Nippon Electric Glass. (2022, 04 April). AR Cam Lif. [Online]. Available: https://www.neg.co.jp/en/product/a-chopped_strand_list/
[13] F. Küçük, “Investigation of the effect of high performance polypropylene fiber additive on the undrained shear strength of clay soil (in Turkish)”, M.Sc. Thesis, Sakarya University Institute of Science and Technology, Sakarya, 2020.
[14] S. Çaylak, “The effect of alkyl ketene dimer on the performance properties of natural fiber and glass fiber reinforced biopolymer composites (in Turkish)”, M.Sc. Thesis, Bursa Technical University Institute of Science and Technology, Bursa, 2021.