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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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US vice president JD Vance, wife Usha and kids visit Jaipur’s iconic Amber Fort | Pics

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US vice president JD Vance, wife Usha and kids visit Jaipur’s iconic Amber Fort | Pics

US Vice President JD Vance, his wife Usha Vance, and their children visited the historical Amer Fort in Jaipur on April 22, 2025. The Vance family received a warm welcome at the Fort, where they were greeted with a traditional Rajasthani dance performance and elegantly decorated elephants. Second Lady Usha Vance, the wife of US vice president JD Vance, carries her daughter Mirabel as they watch a cultural performance at the Amber Fort in Jaipur.

Rajasthan CM Bhajanlal Sharma welcomed the Vance family as they visited the historic Amer Fort in Jaipur. The Vance family will depart for the US early Thursday morning. In related news, JD Vance and wife Usha attended Good Friday service at St. Peter’s Basilica in Vatican City. Vance also visited the Taj Mahal in Agra on April 23, 2025. Vance said that “good progress.

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In other news, Pope Francis’ funeral is set to start on Wednesday, and the J&K tourist hub has been completely shut today. On 4/20, celebrations across the US highlight cannabis culture and calls for legalization had been made towards a trade deal with India after meeting with “tough negotiator” Prime Minister Narendra Modi in New Delhi. The Vance family visited.

On April 22, 2025, US Vice President JD Vance, accompanied by his wife Usha Vance, and their three children, visited Jaipur’s historic Amber Fort. The family received a warm welcome, highlighted by traditional Rajasthani folk performances and a red carpet reception. As they entered the fort’s main courtyard, Jaleb Chowk, they were greeted by two elegantly decorated elephants named Chanda and Mala, raising their trunks in greeting. ​

During their visit, the Vances were joined by Rajasthan Chief Minister Bhajanlal Sharma and Deputy Chief Minister Diya Kumari, who guided them through the fort’s rich history and architectural marvels. The family also enjoyed cultural performances featuring traditional dances such as Kacchi Ghodi, Ghoomar, and Kalbeliya, offering a glimpse into the vibrant.

Usha Vance, dressed in a chic white shirt and patterned skirt, explored the fort alongside her family and dignitaries, embracing the cultural experience culture of Rajasthan This visit was part of Vice President Vance’s four-day official trip to India, aimed at strengthening bilateral relations between the United States and India. The Vance family departed for Washington.

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Bhajanlal Sharma welcomed the Vance family as they visited the historic Amer from Jaipur on April 24, concluding their cultural tour of India Upon their arrival at Amber Fort, the Vance family was greeted with traditional Rajasthani hospitality. Two elegantly decorated elephants, Chanda and Pushpa, adorned with silver ornaments, were stationed at the entrance welcome.

The family was also treated to a cultural performance featuring folk artists dressed in traditional Rajputi and Kalbelia attire, accompanied by musicians playing regional instruments. The vibrant rangolis and the overall festive atmosphere highlighted the rich cultural tapestry of Rajasthan The fort’s impressive courtyards and majestic structures.

Exploring the Fort’s Historical Significance

During their tour of Amber Fort, the Vance family explored various architectural marvels, including the Sheesh Mahal (Mirror Palace), known for its intricate mirror work and stunning design. They were accompanied by Rajasthan Chief Minister Bhajanlal Sharma and Deputy Chief Minister Diya Kumari, who provided insights into the fort’s history and significance.​

Engaging with Local Culture

Throughout their visit, Vice President Vance demonstrated a keen interest in engaging with The Vance family’s visit to Amber Fort was part local culture. He interacted with the folk artists and expressed appreciation for the traditional performances, reflecting a genuine curiosity and respect for India’s diverse cultural heritage.​

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