Faculty Publications
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Item Influence of Granulated Blast Furnace Slag and Cement on the Strength Properties of Lithomargic Clay(Springer India sanjiv.goswami@springer.co.in, 2017) C. Sekhar, D.C.; Nayak, S.; Preetham, H.K.Utilizing industrial byproducts in soil stabilization benefits the economic, environmental and social benefits. Granulated blast furnace slag is a byproduct of iron and steel industry having oxides similar to that of cement but in different proportions. This study describes experimental results achieved by the use of granulated blast furnace slag (GBFS) and cement in stabilizing lithomargic clay for geotechnical applications. Soil was replaced by GBFS in percentages of 10, 15, 20, 25, 30, 35, 40, 45, 50% and cement of 2, 4, 6, and 8% by dry weight of soil is added. Various experimental studies like specific gravity, Atterberg limits, compaction, UCS, CBR and triaxial compression test, were performed on samples to understand the effect of these mixes on their few index and strength properties. The study also includes an investigation on a combination of optimum percentage of GBFS with varying percentage of cement and lime on their shear parameters. The study result shows significant improvement in the strength properties of the mixes. Hence it can be concluded that lithomargic clay stabilized with GBFS and cement/lime satisfy the strength requisite to be employed in the numerous geotechnical applications. © 2017, Indian Geotechnical Society.Item Utilization of granulated blast furnace slag and cement in the manufacture of compressed stabilized earth blocks(Elsevier Ltd, 2018) C. Sekhar, D.; Nayak, S.This study involves the investigation on utilization of granulated blast furnace slag (GBFS) and cement in the manufacture of compressed stabilized earth blocks (CSEB). Two locally available soils from Dakshina Kannada district, Karnataka, India were tested for their index and strength properties with replacement of granulated blast furnace slag (GBFS). An optimum percentage of replacement of GBFS was established and then varying percentages of cement was added for the production of compressed stabilized earth blocks (CSEBs). This stabilized soil was used for the manufacture of blocks of size 305 mm × 143 mm × 105 mm. All the blocks were cast to a target density, followed by the curing for 28 days. The blocks were subjected to compression test and water absorption test according to Indian Standard (IS) specifications. The test results showed that the CSEBs prepared with GBFS and cement can be utilized in masonry for load bearing wall construction. A small percentage of cement is sufficient for manufacturing the CSEBs when optimum GBFS content is replaced with that of soil, thereby reducing the energy consumption. © 2018 Elsevier LtdItem Geotechnical Investigations on Marine Clay Stabilized Using Granulated Blast Furnace Slag and Cement(Springer, 2019) Preetham, H.K.; Nayak, S.Marine clay is present along the coastal region all around the world. This soil is highly problematic and unfit to support any engineering structures. They are characterized by high liquid limit, high plasticity index with low shear strength and high compressibility. The primary by-product generated from the ferrous industry is granulated blast furnace slag (GBFS), and CaO present in GBFS acts as a binding agent. This paper describes the detailed experimental results by incorporation of GBFS and cement to the marine clay. Soil was replaced by GBFS in various percentages (10%, 20%, 30%, 40% and 50%) and addition of cement (2%, 4%, 6%, 8% and 10%) in percentage of dry weight of soil. Soil and various mixtures are examined for its geotechnical properties, which include specific gravity, consistency limits, compaction characteristics, unconfined compression strength and strength parameters. From the unconfined compression test results, 40% GBFS replacing the marine clay is concluded as the optimum mix. Improvement in the strength is due to the formation of CSH, CAH, CASH and other cementitious compounds which are observed in SEM and XRD studies. From the investigation, it is concluded that GBFS with or without cement can be used as a potential stabilizer for soft marine clay. © 2019, Springer Nature Switzerland AG.