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This study aims to characterize the behavior of blended concrete, including metakaolin (MK) and quarry dust (QD), as supplementary cementing materials. The study focuses on evaluating the effects of these materials on the fresh and hardened properties of concrete.

MK, a pozzolanic material, and QD, a fine aggregate by-product, are potentially sustainable alternatives for enhancing concrete performance and reducing environmental impact. The addition of different percentages of MK enhances the pozzolanic reaction, resulting in improved strength development. Furthermore, the optimum dosage of MK, mixed with QD, and mechanical properties like compressive, flexural and split tensile strength of concrete were evaluated to investigate the synergetic effect of MK and quarry dust for M20-grade concrete.

The results reveal the influence of metakaolin and QD on the overall performance of blended concrete. Cost analysis showed that the optimum mix can reduce the 7%–8% overall cost of the materials for M20-grade concrete. Energy analysis showed that the optimum mix can reduce 7%–8% energy consumption.

The effective utilization is determined with the help of the analytical hierarchy process method to find an optimal solution among the selected criteria. According to the AHP analysis, the optimum content of MK and quarry dust is 12% and 16%, respectively, performing best among all other trial mixes.

The objective of this paper is to find out the rationale for institutional repository (IR) categories, and the challenges in sustainable development of open scholarship to facilitate scholarly communication.

This is a critical study method adopted to find out the categories of IR and various developmental challenges with the aid of related literature.

IR categories and their nomenclature are found to be overlapping when used by repository registries and librarians alike. As the digital objects in the repositories are expanding, with a requirement to store new entities as diverse as linked data and web archives, IR categorization becomes difficult to determine. Even though the growth of IRs in India is phenomenal, concerted research and development efforts to strengthen digital infrastructure and repository solutions in multilingual settings are slow.

With the rapid growth of IRs worldwide, the categories with which these are classified is examined. As a contentious player in scholarly communication process, the challenges of IRs' development are underlined. The prospects and deployment of IRs requires funding and an appropriately skilled workforce, along with government support. This is viewed from global and Indian perspectives.