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Ozcan Tan,Gokhan Gungormus,A. Sahin Zaimoglu 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.6
Injection is one of the methods to improve the engineering properties of bases. Various additions as well as cement are used forpreparations of injection blends in order to lower costs and reach better results. For this purpose in the preparation of the injectionblends, Bentonite (B), Fly Ash (FA) and Silica Fume (SF) were used at the ratios of 0-0.5-1-3%, 10-20-30-40% and 0-5-10-20%,respectively. Taguchi method was applied for the experiment and L16 Orthogonal Array (OA) with three factors and four levels werechosen. Granular bases having 0.70 relative density was settled into a cylindrical mold to which injection blends were injected. Effectof B, FA and SF over the uniaxial compressive strength of the samples of 7, 14, 28 days that have been prepared in this manner wasinvestigated. In results of the experiments it was observed that the most effective parameter over the uniaxial compressive strength of7, 14 and 28 days was silica fume.
Ahmet Sahin Zaimoglu,Ozcan Tan,Rahim Kagan Akbulut 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.2
It is a well-known fact that water content has a significant effect on the engineering properties of fine-grained soils. There is a close relationship between consistency limits and geotechnical parameters of fine-grained soils. This experimental study was performed to investigate the effect of randomly distributed polypropylene fibers (PP) and some additive materials [e.g., Borogypsum (BG), Fly Ash (FA) and Cement (C)] on consistency limits and plasticity index of a fine-grained soil. The Taguchi method was applied to the experiments and standard L9 Orthogonal Array (OA) with four factors and three levels were chosen. A series of consistency limits were conducted on each specimen. 0-20% BG, 0-20% FA, 0-0.25% PP and 0-3% of C by total dry weight of mixture were used in the preparation of specimens. In the tests, distilled water (DW), DW + 0.05% Air-Entrainer (AE) and DW + 0.15% AE were used as mixture liquid. Experimental results showed that the most effective material for decreasing the liquid limit and plasticity index of the samples were fly ash, polypropylene fiber respectively. The plasticity index decreased with increasing of AE. The values of plasticity index for distilled water, distilled water + 0.05% air-entrainer and distilled water + 0.15% air-entrainer in optimum conditions were 16%, 14% and 8%, respectively.