Jagadeesh P

Bio: Jagadeesh P is an academic researcher from VIT University. The author has contributed to research in topics: Durability & Aggregate (composite). The author has an hindex of 2, co-authored 7 publications receiving 11 citations. Previous affiliations of Jagadeesh P include K L University.

Influence of Quarry Dust on Compressive Strength of Concrete

Abstract: Objectives: In the present study, by-product of stone crushed, quarry dust is replaced as a fine aggregate with 20%, 30%, 40%, 50% replacement. Methods/Analysis: The fine aggregate is being replaced with fine aggregate and the compressive strength is determined for the concrete by testing the sample cube. The properties such as the specific gravity, fineness modulus, moisture content etc. are determined for the sample. Findings: Quarry dust is a decent option for normal sand and it is likewise very temperate, as quarry dust is a waste left from quarries. Novelty/Improvement: The quarry dust displays better quality because of good holding attributes.

Investigation of trends and its magnitude by non-parameteric Mann-Kendall and Sen's slope methods

Abstract: Present study aims to determine trends and inconsistency in the magnitude of annual and seasonal rainfall using Mann-Kendall and Sen's slope non-parametric analyses. The rainfall data used in this study includes 35 years of monthly rainfall at eight rain gauge stations of Bharathapuzha catchment, Kerala. Mann Kendall analysis revealed that, out of eight stations only 25% of stations showed a positive trend in annual and south-west monsoon rainfall. And all stations showed a positive trend for pre-monsoon, while only 37.5% of stations showed a positive trend in north-east monsoon. From Sen's analysis, it was observed a decrement of 32.67 mm/yr and 23.87 mm/yr in annual and south-west monsoon in Eland. A decrement of 15.79 mm/yr was observed in Pazhaynur Seed for south-west season, while 5 mm/yr for annual monsoon. At Pokkunni an increment of 16.30 mm/yr was observed for annual and 9.33 mm/yr increment for south-west monsoon. A decrement of 6.55 mm/yr and 1.88 mm/yr was observed respectively at Walayar for annual and southwest monsoon. An overall trend analyses reflect increasing trend in the east and more decreasing trend in the south and west compared to north of the catchment.

A review of system dynamic model for risk assessment in construction of megaprojects in India

Abstract: Project Risk Management is one of the critical components of Project management as the risks for any project and in particular construction of megaprojects, if not addressed and managed may lead to project failures. Mega construction projects deploy complex technologies, which make it vulnerable to failure in terms of time, cost and quality achievement. As per Baker et al (1998) [1]"there is no global (project risk management) industrial standard" or procedures that exist for what constitutes a risk assessment. This implies that there is a wide range of risk management standards discussed in literature within the domain of project management. However the conventional standards still lack systematic approach to describe all the interactions among Social, Technical, Economic, Environmental, Political (STEEP) risks with regard to all complex and dynamic conditions through megaproject construction that can be disastrous and cause chronic project failure. This paper presents a concise review of the different risks that may arise during a megaproject construction and how they can be modelled using System dynamics.

A Hybrid Fuzzy TOPSIS – Best Worst Method for Risk Prioritization in Megaprojects

Abstract: Megaprojects are usually complex and in many cases encounter failure in terms of finish late or overspent. This study aims to investigate the critical risk factors behind these projects as well as their priority. Project risk management is a mature research stream. But when focus on megaprojects the amount of research decreases significantly. This research provides a hierarchy of risk structure in Tehran-Rasht railway megaproject and prioritizes the risk factors through a two-phase methodology. This method is a new hybrid MCDM technique consist of group fuzzy TOPSIS and fuzzy Best-Worst Method. BWM is the latest MCDM technique which in this paper, its fuzzy version combined with fuzzy TOPSIS is employed. This research also considers all the project success criteria including time, cost and quality simultaneously and calculates the risk priority Index (RPI) accordingly. The results imply that quality is the most important project success factor and the risk elements with greater impact on project quality, get higher PRI. The identified and ranked risk factors help practitioners and academics to follow the subsequent steps of the risk management process of Iranian transportation megaprojects.

Quarry dust fine powder as substitute for ordinary portland cement in concrete mix

Abstract: Tremendous efforts have been done in the area of concrete technology to study the utilization of by-products and waste materials which can be used as a partial cement replacement in concrete production as well as identifying the benefits of these alternative materials as cement in concrete. Quarry dust as a by-product from crushing of coarse aggregates during quarrying activities has received considerable attention to enhance the properties of concrete. Thus, this paper reports the research conducted on the suitability of quarry dust fine powder (QDFP) as cementitious material in concrete. The performance in terms of its mechanical and durability index were evaluated on concrete composed of various w/b ratios (0.3, 0.4, 0.5 and 0.6) for replacement level of 3%, 5%, 10% and 15%, and with the inclusion of superplasticizer (Sp) to enhance the workability of concrete. The performance was measured at 7, 28, 60, 90 and 120 days of age. The results show that inclusion of QDFP did not enhance the compressive strength of concrete. Rebound number (RN) for QDFPSp concrete made of 0.3 and 0.4 w/b ratios achieved good quality, while for those made of 0.5 and 0.6 w/b ratios, it falls under category poor and fair respectively. In terms of durability index performance, the QDFP concrete in higher proportion (up to 15%) and with increasing w/b ratio from 0.3 to 0.6 increase the coefficient of permeability, while QDFP concrete can be considered as good concrete since the water absorption recorded below than 10% by mass.

Strategies for Waste Recycling: The Mechanical Performance of Concrete Based on Limestone and Plastic Waste

Abstract: Recycling is among the best management strategies to avoid dispersion of several types of wastes in the environment. Research in recycling strategies is gaining increased importance in view of Circular Economy principles. The exploitation of waste, or byproducts, as alternative aggregate in concrete, results in a reduction in the exploitation of scarce natural resources. On the other hand, a productive use of waste leads to a reduction in the landfilling of waste material through the transformation of waste into a resource. In this frame of reference, the paper discusses how to use concrete as a container of waste focusing on the waste produced in limestone quarries and taking the challenge of introducing plastic waste into ordinary concrete mixes. To prove the possibility of reaching this objective with acceptable loss of performance, the mechanical characteristics of concrete mixed with additional alternative aggregates classified as waste are investigated and discussed in this paper through the presentation of two experimental campaigns. The first experimental investigation refers to concrete made with fine limestone waste used as a replacement for fine aggregate (sand), while the second experimental program refers to the inclusion of three types of plastic wastes in the concrete. Different mixes with different percentages of wastes are investigated to identify possible fields of application. The experimental results indicate that use of limestone quarry waste and use of plastic waste are possible within significant percentage ranges, having recognized a limited reduction of concrete strength that makes concrete itself appropriate for different practical applications.