International Journal of Technology

S. S. Saravanan ¹, P. Jagadeesh ¹

Affiliations
1 School of Mechanical and Building Sciences, VIT University, IN

Abstract

This paper presents the performance of compressive strength of M40 Grade artificial sand concrete with replacement of river sand to manufactured/Artificial sand. This necessitates huge demand of concrete for infrastructure development worldwide and extreme scarcity of natural sand availability. Investigation carried out by varying 0 to 100% replacement of natural sand using manufactured sand in M40 mix with super plasticizer as an admixture. The super plasticizer is used as admixture of dosage 0.5% volume fraction in all concrete mixes. The concrete specimens were cured on normal moist, curing under normal atmospheric temperature. The compressive strength, split tensile Strength, and flexural strength were determined at 7, 14 and 28 days. Current investigation revealed that M 40 Grade concrete using complete manufactured sand with super plasticizer yielded an excesses compressive strength of 9.50%, 9.80% and 10.45% compared to conventional concrete for 7 days, 14 days and 28 days respectively. It also revealed that workability of concrete with manufactured sand could be increased considerably with super plasticizer. Hence M40 Grade concrete with manufactured sand was found to increase the compressive strength of concrete on all ages when compared to conventional concrete with river sand. Split Tensile Strength and Flexural Strength also increased to 10.61%, 9.49% more at 28 days respectively compared to conventional concrete.

Keywords

Admixture, Compressive Strength, Cement, Manufactured/Artificial Sand, M40 Grade Concrete, Natural River Sand.

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Debalina Banerjee ¹, P. Jagadeesh ², P. Rama Mohana Rao ³

Affiliations
1 Department of Civil Engineering, ICEAS, Bangalore, IN
2 School of Mechanical and Building Sciences, VIT University, Vellore, IN
3 Centre for Disaster Mitigation and Management, VIT University, Vellore, IN

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.

Keywords

Megaprojects, Risk Assessment, System Dynamics, STEEP Risks.

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