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Daily Archives: September 13, 2025

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Public-Private Partnerships: Catalyzing Sustainable Infrastructure and Service Innovation

Authors: Podapala Siva Reddy, Ch. V. Radhika, Gadiraju Parvathi

Abstract: Public-private partnerships (PPPs) have changed over centuries, notably since the Roman Empire, to modern forms of infrastructure production and public service delivery. There has been a resurgence of interest beginning in the late twentieth century in seeing PPPs as a way to engage in infrastructure development via viable financing alternatives and efficient risk sharing. This study examined whether PPPs are effective in both mobilizing private-sector capital for infrastructure development, whether they do so through-efficient risk allocation, and also whether this risk allocation model for service delivery yields improved and responsive public service delivery within the context of infrastructure production. The study considered international examples of implementation, the most salient contractual and other governance characteristics of PPPs, and critically examined factors that impact sustainability of PPPs. The study was mixed-methods and underscored how PPPs can enhance infrastructure production/quality and that future research should focus on sectoral frameworks, the socio-economic implications of PPPs for communities, and advancements of the governance framework for PPPs.

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Comparative Review On Self-Healing Concrete Using Bacteria And Crystalline Admixtures

Authors: Mrs. Vandana Rahul Shah

Abstract: Concrete, though the most widely used construction material, is prone to cracking, which compromises durability, service life, and sustainability of structures. Conventional repair methods are temporary, costly, and labor-intensive. In recent years, self-healing concrete has emerged as a promising alternative, capable of autonomously repairing cracks and enhancing long-term performance. This review focuses on two major self-healing approaches: bacterial concrete, where microorganisms such as Bacillus subtilis precipitate calcium carbonate within cracks, and crystalline admixture-based concrete, where chemical additives react with unhydrated cement particles and moisture to form insoluble crystals. A comparative analysis of past studies indicates that bacterial concrete can effectively heal cracks up to 0.8 mm, providing superior strength and durability improvements, though at higher cost. Crystalline admixtures, on the other hand, are economical, commercially available, and suitable for healing micro-cracks up to 0.5 mm, particularly in water-retaining structures. The paper highlights the mechanisms, advantages, limitations, and applications of both approaches, and identifies future research directions including hybrid systems, large-scale field trials, and cost optimization. Findings suggest that self-healing concrete technologies have significant potential to reduce maintenance needs and promote sustainable infrastructure development.

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