Browsing by Author "Kuttagola, K."

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    Experimental Studies on the Mechanical and Durability Properties of Mortar Containing Waste Glass Powder as Partial Replacement of Cement
    (Springer Science and Business Media Deutschland GmbH, 2024) Chopra, S.; Kuttagola, K.; Prashanth, M.H.
    It is well known that Portland cement production is an energy-intensive industry, being responsible for about 5% of the global anthropogenic carbondioxide emissions worldwide. An important contribution to the sustainability of concrete and cement industries consists of using pozzolanic additions, especially if obtained from waste such as waste glass. In the present study, crushed waste glass was used in mortar as a partial cement replacement (0, 5, 15, 25, 35, and 45%) material to ascertain applicability in concrete. Experimental studies were carried out to determine mechanical properties like compressive strength and split tensile strength and durability properties by immersing mortar in 5% sulphuric acid and hydrochloric acid solution. Experimental results indicate better mechanical properties of mortar with 15% replacement of cement by glass powder. Further, with 15% replacement of cement by glass powder has shown better resistance to sulphuric acid attack and weight loss is comparable to weight loss in normal mortar in sulphuric acid and thus 15% replacement of cement can be considered as optimum dosage of glass powder in concrete. Also, glass powder replacement above 35% have performed poorly in all tests except in tensile strength test. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.
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    Numerical Study on Static and Fatigue Behavior of Alkali-Activated Fly Ash Concrete Modelled using Concrete Damage Plasticity (CDP) Model
    (Institute of Physics, 2024) Nandhineekrishna; Channappa, T.M.; Prashanth, M.H.; Kuttagola, K.
    Alkali-activated concretes (AAC) are considered as an alternative to Portland cement concretes because of their much lower carbon emissions. To study its characteristics is of utmost importance. In the present research, an attempt is made to create a numerical model to analyze the static and fatigue flexural behavior of alkali-activated fly ash concrete (FC) and compare them with ordinary Portland cement concrete (PCC). Three-point bending tests are simulated for the monotonic load to obtain the static behavior of a 2D notched rectangular beam. A 2D beam specimen of size 262.5 mm x 75 mm, with a notch of size 15 mm x 3 mm was provided at the bottom middle. Fly ash-based alkali-activated concrete (FC) and corresponding PCC of similar strength are modeled in ABAQUS CAE using the concrete damage plasticity (CDP) model. The ultimate loads, maximum deflection, and CMOD for each of them were obtained from the history output manager. The results of monotonic tests are utilized for creating a sinusoidal load cycle for fatigue tests with various loading frequencies and stress ratios. Different structural responses are examined under the fatigue test. The results showed that FC performs better than PCC under static and fatigue tests. Fatigue performance of both FC and PCC is influenced by the frequency of loading and fatigue life increases at higher frequencies. It is also found that stress reversal negatively impacts the fatigue life of both FC and PCC. © Published under licence by IOP Publishing Ltd.