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49 research outputs found

Behavior of Mono Helical Pile Foundation in Clays under Combined Uplift and Lateral Loading Conditions

Author: Muthukumar Mayakrishnan
Vignesh Venkatesan
Publication venue
Publication date: 06/07/2022
Field of study

Offshore wind energy development is driven by ongoing research and development to determine technological issues connected with offshore wind turbines. A fundamental design difficulty is the offshore wind turbine foundations. By far, one of the most commonly practiced foundation systems is mono helical pile foundations because of their simplicity and resilience. Most of the studies on mono helical piles were focused on granular soils and few studies were on clayey soils. However, mono helical piles in clayey soils under combined loading remain to be examined. Hence, a series of three-dimensional finite element analyses were carried out to predict the uplift and lateral capacity of the helical pile embedded in soft clay. The numerical model is verified using the results from the analytical results and a small-scale laboratory test. The verified model is used to simulate the helical pile behavior under the combined uplift and lateral loading condition considering the pile with a different number of helical plates. The results of the combined loading analyses reveal that the lateral capacity decreased when the pile was subjected to uplift load, and a maximum reduction of 12% is observed in mono helical piles provided with a single plate for an applied 50% of the ultimate uplift load. The influence of uplift load also increased the bending moment of the helical pile. Finally, it is suggested that the helical piles should be designed considering the aspects for combined loading conditions

Multidisciplinary Digital Publishing Institute

Influence of fibres on volume change attributes of expansive soil blended with lime

Author: Mayakrishnan Muthukumar
Sanjay Kumar Shukla
Publication venue
Publication date: 01/02/2019
Field of study

Expansive soils are considered to be highly problematic due to their dual swell–shrink behaviour. In recent years, polymeric fibres are used to control the volume change behaviour of expansive soils. In this study, different proportions of lime and fibres were used to study the swelling and shrinkage behaviour of expansive soils. The test results showed that swelling tended to decrease slightly with an increase in the fibre content, whereas shrinkage decreased significantly with the addition of fibres. The optimum fibre content was found to be 2%. Both swelling and shrinkage tended to decrease significantly with increasing the lime content. It was also found that the optimum lime content is different for controlling swelling and shrinkage. Therefore, expansive soil specimens blended with 2% fibre and with varying lime contents were tested. The addition of 2% fibre helped to reduce the content of lime required for controlling shrinkage. It was found that blending 2% fibres and 5% lime together in expansive soils is effective for controlling both swelling and shrinkage behaviour. </jats:p

Crossref

Statistical Optimization of Blending Conditions and Performance Evaluation of Optimal Bio-Asphalt Content

Author: T.H. Varun Kumar
Somasundaram Murugavelh
Mayakrishnan Muthukumar
Publication venue
Publication date: 01/08/2025
Field of study

To mitigate environmental impacts and promote sustainability in highway construction, this study investigates the optimization of blending conditions and the performance evaluation of bio-modified asphalt binder incorporating bio-asphalt derived from the pyrolysis of waste cooking oil (WCO) and low-density polyethylene (LDPE). A response surface approach was employed to optimize key blending parameters—temperature, speed, and time—based on critical physical properties of the binder. Furthermore, the optimized bio-asphalt binder was further evaluated through rheological performance tests (multiple stress creep recovery and linear amplitude sweep) and mechanical performance tests (Marshall stability, tensile strength ratio, resilient modulus, indirect tensile fatigue, and dynamic creep). The optimal conditions were identified as 130°C, 1000 rpm, and 42.37 min. Statistical validation using ANOVA, residual analysis, leverage, and Cook’s distance confirmed the model’s reliability, with prediction errors remaining below 5%. The bio-modified asphalt binder exhibited enhanced elastic recovery and reduced non-recoverable creep compliance (Jnr), indicating superior resistance to permanent deformation in comparison with the control asphalt binder. Additionally, the bio-modified asphalt mixture demonstrates superior Marshall stability, resilient modulus, tensile strength ratio, retained stability, and resistance to deformation in comparison with the control asphalt binder. These results demonstrate the potential of bio-asphalt as a viable, eco-friendly modifier for asphalt binders in tropical climates

Civil Engineering Journal (C.E.J)

Civil Engineering Journal

Production Processing and Aanalysis of Animal Research Diets

Author: Swaminathan R.
Publication venue
Publication date: 2009
Field of study

This Dissertation / Report is the outcome of investigation carried out by the creator(s) / author(s) at the department/division of Central Food Technological Research Institute (CFTRI), Mysore mentioned below in this page

Central Food Technological Research Institute, New Delhi: ePrints@CFTRI