Conference Papers

Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506

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    The limit of limits
    (School of Engineering and Technology, 2006) Babu Narayan, K.S.B.
    Throughout the history structural engineering has wrestled with the forces of nature and has accomplished the inspiring, daring and amazing feats of innovating structures of gigantic proportions. The tallest building on earth has crossed the 500m barrier and heights exceeding 800m are being ambitiously contemplated. Mind boggling spans for bridges are being suggested and possibilities are being investigated. At this most-happening juncture of time, this paper envisages to explore, with simple and familiar concepts, the limits of possibilities and the hurdles to be cleared to extend the limits. © 2006 by School of Engineering and Technology, Asian Institute of Technology.
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    Effect of grooves on the static strength of tubular T joints of offshore jacket structures
    (Elsevier Ltd, 2019) Murugan, N.; Kaliveeran, V.; Nagaraj, M.K.
    The present research work deals with effect of grooves on static strength and stiffness of tubular T joints of offshore jacket structures. Tubular structures are commonly employed in offshore jacket platforms due to better mechanical properties and economic advantages. The tubular T model considered for this study has chord dimensions of 1000 mm length, diameter 102 mm and thickness 5 mm and brace dimensions of 388 mm length, diameter 55 mm and thickness 4 mm. Material used for present analysis is Steel with Young's modulus of 210 GPa and the Poisson ratio of 0.3. Three-dimensional finite element analysis has been carried out to investigate the effect of grooves placed over thickened chord section on the static strength of tubular T joints subjected to axial compressive load. In the present study, unstiffened tubular T joint is analysed and compared with stiffened tubular T joints to observe the improvement in the static strength of the tubular T joints. The groove configurations considered are: 5 circumferential grooves at 16.5 mm spacing, 3 circumferential grooves at 16.5 mm spacing and 3 circumferential grooves at 33 mm spacing. The grooves were having the dimension of 1 × 1 mm, 2 × 2 mm were used for the analysis. The joint local stiffness of ungrooved tubular T joint is 116.43 N/mm. The grooved configuration increases the joint local stiffness by more than 250 percent. © 2019 Elsevier Ltd. All rights reserved.
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    Tensile characteristics of HDPE/Walnut shell composites
    (Institute of Physics Publishing helen.craven@iop.org, 2019) Malagi, S.; Anawal, R.; Gorabal, S.V.; Doddamani, M.
    Present work deals with tensile characterization of walnut shell (WS) powder (20, 40 and 60 volume %) reinforced High Density Polyethylene (HDPE) thermoplastic composites synthesized using injection molding. Composite density and tensile modulus increases with increasing WS content wherein tensile strength of composite samples is lower as compared to neat HDPE. Specific modulus and strength show increasing and decreasing trend with higher WS loading respectively. © 2019 IOP Publishing Ltd. All rights reserved.
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    Influence of copper slag properties on behaviour of cement mortars and concrete
    (Springer Science and Business Media Deutschland GmbH, 2021) Arpitha, D.; C, C.
    The promotion of green infrastructure as an alternative to traditional concrete, known as grey infrastructure, is not as benign as many people think. In this concern, many alternative materials have been kept in place as a solution for the problems faced by the construction industry. The knowledge of understanding the basic property of a material is significant as the characteristics cannot be directly assumed that it can be compared to FA while mixing concrete. In this work, Copper Slag (CS) is used as a partial replacement for Fine Aggregate (FA), and a major focus is to understand the behaviour of the material based on its particle size, texture shape and surface characteristics as it decides the quality of concrete. Also, the importance of optimizing water/cement ratio (w/c) and dosage of Superplasticizer (SP) is a major consideration in this work which has a great impact on workability and strength parameter as it affects durability performance of concrete. Marsh cone test to decide optimum SP was carried out for PCE-based SP and Portland Pozzolana Cement (PPC). Optimal w/c ratio was decided based on the trials carried out using flow test for mortars, and mortar cubes were prepared and tested for 3, 7 and 28 days compressive test. In order to check the behaviour of CS in concrete, cubes were prepared and subjected to compressive strength for 7, 28 and 90 days based on the ideal water–cement ratio (w/c) and SP obtained from various trials conducted to achieve required workability and strength. Test results revealed that CS mortars and concrete exhibited higher strength than the control mix. The chemical reaction between the cement matrixes, incorporation of CS and SP for optimized w/c and dosage of SP not only enhanced the strength but also provided the required workability though CS has less water absorption capacity. © Springer Nature Singapore Pte Ltd 2021.
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    Alkali Activated Black Cotton Soil with Partial Replacement of Class F Fly Ash and Areca Nut Fiber Reinforcement
    (Springer Science and Business Media Deutschland GmbH, 2023) Chethan, B.A.; Ravi Shankar, A.U.; Chinnabhandar, R.K.; Kumar, D.H.
    Alkali activation has received great attention for improving the soil properties with suitable precursor materials. Industrial byproduct class F fly ash was suitably utilized to improve Black Cotton (BC) soil properties along with ordinary Portland cement by various researchers. However, the CO2 emission associated with cement production has enforced the evaluation of alternative binders. Laboratory investigations were conducted on BC soil by admixing various fly ash dosages (0–50%) and reinforcing the mix with 0.5% areca nut fiber. Alkali activator solution prepared using 8 molar sodium hydroxide solution (SH) and sodium silicate solution (SS) at 1.5 SS/SH ratio showed significant improvement in Unconfined Compressive Strength (UCS) of stabilized BC soil on 7 and 28 days curing. The reinforcement was effective in improving the flexural strength of stabilized mixes. Exorbitant unsoaked California Bearing Ratio (CBR) values were observed on 28 days of curing. However, the samples could retain low soaked CBR values despite reinforcement. Scanning Electron Microscope (SEM) images showed the reduction of shrinkage cracks and strong bonding of fibers in the stabilized mix. X-Ray Diffraction (XRD) patterns evidenced the formation of various hydration products due to the alkali reaction, which resulted in the high strength gain of mixes at ambient temperature curing. The leaching of mineral constituents from the set mix lead to the failure of durability samples. Due to nondurability, the alkali activation with a selected precursor cannot suit pavement materials requirements. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.