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Practical Recommendations for Construction of Longitudinal Joints in Hot Mix Asphalt (HMA) Pavements

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Practical Recommendations for Construction of Longitudinal Joints in Hot Mix Asphalt (HMA) Pavements

Rajib B. Mallick, Distinguished Professor of the Ralph White Family, Civil and Environmental Engineering, Worcester Polytechnic Institute (WPI), Massachusetts, USA, Veeraragavan Amirthalingam, Professor of Civil Engineering, IIT Madras Hot mix asphalt (HMA) is mainly composed of mineral aggregate and asphalt binder.

They are heated and mixed at high temperature (~150oC) in the factory, and placed together with the paver at a low but sufficiently high temperature (~140oC) ), and before the temperature drops below a certain level (usually 90-100oC) with roller compaction. Due to the increased stiffness, once the temperature of the mixture drops below about 90oC, compaction usually becomes very difficult.

This change in stiffness is the result of the change in the stiffness of the asphalt binder, which behaves as a viscous material at high temperatures and as a viscoelastic material in most other temperature ranges. The carefully designed and constructed HMA pavement provides a durable, smooth and waterproof surface at a relatively low cost. HMA (also known as asphalt) pavements do not need to create joints like ordinary Portland cement concrete (PCC) pavements.

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However, unless trapezoidal paving is used, longitudinal seams will appear between adjacent paving lanes. During the first pass of the paver, the first lane is constructed. When placing adjacent channels, the first channel is already cooled and is called the cold side of the joint.

The second channel is often referred to as the hot side of the joint. During the compaction of the cold lane edge, the road surface is not constrained, so the density near the edge is lower (higher clearance) compared to the area far from the edge. There is a restriction when compacting the edge (hot side) of the adjacent lane because it is placed next to the cold seam. Due to problems at the joint and on both sides of the joint, the density directly in the joint is almost always lower than that of the asphalt mixture away from the joint.

The low-density joint area is the “Achilles’ heel” of other well-structured pavements because it may allow water and debris to enter the pavement quickly and may cause subsequent disintegration and premature damage

News Source : NBM&CW

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Construction Infrastructure

Equipped to thwart cyber attacks: Banks, insurance firms to Sitharaman

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Equipped to thwart cyber attacks: Banks, insurance firms to Sitharaman

Sitharaman gave banks instructions to keep offering smooth services to customers, even in isolated locations, in cooperation with authorities and security firms as needed. Finance Minister Nirmala Sitharaman received assurances from Indian banks and insurance companies on Friday that they are prepared to stop any cyberattacks by Pakistani outfitted DDoS.

Distributed denial-of-service) systems. “Mock drills covering cybersecurity and disaster recovery scenarios at the highest levels have been held to ensure institutional readiness,” they informed her at a Friday meeting. According to the financial institutions (FIs), they are alert and actively monitoring phishing efforts. In order to guarantee prompt claim payouts.

Continuous customer service, Sitharaman instructed banks to keep offering smooth services to consumers, especially in distant places, in cooperation with regulators and security agencies New Delhi, May 10, 2025 — In a reassuring development for the financial sector, Finance Minister Nirmala Sitharaman on Friday said that banks and insurance companies in India fully.

Speaking at a cybersecurity summit organized by the Ministry of Finance in collaboration with the Reserve Bank of India (RBI) and IRDAI, Sitharaman stated that both public and private sector financial institutions have significantly ramped up their cyber preparedness equipped to counter cyber threats and have strengthened their digital security infrastructure safeguard.

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Rising Digital Transactions, Rising Risk

The Finance Minister’s remarks come in the wake of a growing number of cyber threats targeting the banking and insurance sectors, especially as India witnesses a steep rise in digital transactions. According to official data, digital payments in India grew over 76% year-on-year in FY 2024-25, driven by UPI, mobile banking, and digital policy purchases.

With this surge, the risks associated with data breaches, phishing, ransomware, and unauthorized access have also grown exponentially. Sitharaman emphasized the need for constant vigilance and investment in advanced cybersecurity technologies “Representatives from leading banks and insurance companies have assured the ministry that robust systems.

Institutional Safeguards in Place

The Finance Minister highlighted that both the RBI and IRDAI have issued detailed guidelines on cybersecurity protocols. Regular audits, simulation drills, and incident response mechanisms are now mandatory across institutions “Financial institutions cannot afford to be complacent. Cyber threats are evolving, and our preparedness must stay ahead of that curve.

“Banks are operating with 24×7 Security Operations Centers (SOCs), and insurance companies are also mandated to deploy advanced firewalls and data protection policies,” she noted ” she said real-time monitoring, and preventive frameworks are in place to detect, resist, and respond to cyber attacks,” Sitharaman said customers and operations Sitharaman also.

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Consumer Awareness Key

The minister also urged banks and insurers to invest in customer education. “A large number of cyber frauds happen due to lack of awareness. Institutions must proactively inform and empower users to identify and avoid suspicious links, calls, or messages,” she added mentioned that the government is working closely with the Indian Computer Emergency Response Team (CERT-In) to ensure real-time threat intelligence sharing and coordinated.

As digital finance continues to evolve, Sitharaman reaffirmed the government’s commitment to creating a secure and resilient financial ecosystem for all stakeholders response strategies Finance Minister Nirmala Sitharaman said banks and insurance companies have assured the government of their readiness to counter cyber threats. At a recent cybersecurity summit.

Financial institutions confirmed the implementation of advanced security systems, 24×7 monitoring, and compliance with RBI and IRDAI guidelines. Sitharaman emphasized the need for ongoing vigilance, customer And collaboration with CERT-In to ensure a secure digital financial ecosystem amid rising cyber risks of advanced securit Sitharaman emphasized the need for constant vigilance and investment in advanced.

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