In landfill, it was found that the majority of the plastic items are not biodegradable and very gradually degrade. With reprocessed consumer plastics, many attempts have been made to reduce the impact on the environment and to avoid the consumption of virgin plastics. The plastic blend of 50% reprocessed high density polyethylene (HDPE) and 50% virgin HDPE has been used purposely for this study. Usability of reprocessed HDPE as alternative for virgin HDPE is investigated. This paper investigates the influence of the process parameters melt temperature, holding pressure, and cooling time on tensile strength and flexural strength through Taguchi methodology and grey relational analysis in Injection moulding machine. Multi response characteristics like tensile and flexural strengths are selected to evaluate the process performance and the corresponding moulding parameters of the melt temperature, holding pressure, and cooling time. Optimal combination of injection moulding parameters is determined using Taguchi and Grey relational analysis. Tensile and flexural strengths of the reprocessed HDPE are found close to that of virgin HDPE. Hence, reprocessed HDPE is found a good alternative for virgin HDPE. The confirmation results reveal that, there is significant progress in tensile strength and flexural strength of reprocessed HDPE and Grey relational grade are improved by 6%, 5% and 74% respectively. Optimal combination of the process parameters for the multi-performance characteristics of the reprocessed HDPE is the set with melting temperature at 235 °C, holding pressure at 250 N/m2 and cooling time at 25 s.
The Concrete is one of the most important products which are efficiently and effectively used in the field of construction. The usage of natural aggregates in the process of production of concrete was high which lead to huge deficiency of availability of the natural aggregates. At the same time production of cements leads to more environmental pollution. Therefore, the production of concrete was altered by vast usage of admixtures and replacements for natural aggregates. In this paper M60 grade concrete is prepared by using GGBS as a partial replacement of cement which is a good strength building mineral admixture, the steel fibers were also introduced in the concrete to improve the strength parameter and for ease of work with concrete and addition of AUROMIX – 400 which is provided by FOSROC chemicals Bengaluru as super plasticizers. The concrete specimens like Cubes and Cylinders were casted and allowed to curing over a nominal curing period of 7, 14 and 28 days to know the basic mechanical properties of the concrete with the above replacements and at the same time RCC beams were also casted and cured, then post tensioned to know the flexural details of this special concrete.
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