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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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Omar Slams

Omar slams Pakistan’s ‘neutral’ probe offer on Pahalgam attack: ‘They didn’t even

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Omar slams Pakistan’s ‘neutral’ probe offer on Pahalgam attack: ‘They didn’t even

India has suspended the Indus Waters Treaty, closed the Attari check post, and canceled SAARC visas for Pakistan nationals in response to the Pahalgam attack. Jammu and Kashmir chief minister Omar Abdullah criticized Prime Minister Shehbaz Sharif’s offer for a “neutral” investigation into the Pahalgam terror attack, stating that Pakistan initially denied incident.

India. Shehbaz Sharif said Pakistan was willing to support a “neutral and transparent” investigation into the killing of 26 people in Jammu and Kashmir’s Pahalgam. He emphasized the need for a “grinding halt” to the perpetual blame game and called for Pakistan to tensions participate in any neutral, transparent, and credible investigation. The incident has sparked.

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India has taken several steps against Pakistan following the Pahalgam terror attack that killed 26 people. These include suspending the Indus Waters Treaty, closing the Attari Integrated Check Post, and canceling the SAARC Visa Exemption Scheme (SVES) for Pakistani nationals. The Resistance Front (TRF), a proxy of the Pakistan-based Lashkar-e-Taiba, has claimed.

Responsibility for the attack. Investigations reveal that Adil Ahmed Thoker, a key suspect in rooted in centuries-old cultural growing tensions between India and Pakistan. the Pahalgam attack, received military training in Pakistan before infiltrating India with other terrorists amid speculation about back-channel mediation by countries with close with India Pakistan.

Amid ongoing tensions, Pakistani troops have resumed unprovoked firing along the Line of Control (LoC), and for the second consecutive night, the Pakistani army targeted Indian positions, prompting a retaliatory response from Indian forces. Iran’s foreign minister Seyed Abbas Araghchi offered to “forge greater understanding” between New Delhi and Islamabad.

Araghchi said that Iran stands ready to use its good offices in Islamabad and New Delhi to forge greater understanding at this difficult time. He described India and Pakistan as “brotherly neighbours of Iran, enjoying relations rooted in centuries-old cultural and civilizational ties” and said that they consider them their foremost priority The recent.

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Terrorist attack in Pahalgam, Jammu and Kashmir, has stirred strong reactions across the political spectrum, with former Jammu and Kashmir Chief Minister Omar Abdullah leading the charge in condemning Pakistan’s response to the incident. Pakistan’s offer of a “neutral” investigation into the attack has sparked outrage, with Omar Abdullah accusing.

The neighboring country of failing to take any meaningful action or even offering a proper condemnation of the attack The Pahalgam attack, which occurred in the popular tourist town in the Kashmir Valley, left multiple civilians injured and sent shockwaves through the region. While the perpetrators of the attack are suspected to be militants operating from across.

The border, Pakistan’s reaction has been criticized for its lack of condemnation and accountability. In response to calls for a thorough investigation into the incident, Pakistan offered to conduct a “neutral” probe, suggesting that an impartial body, rather than which occurred in the popular tourist town authorities in either country, should investigate.

Omar Abdullah, known for his sharp and outspoken criticism of Pakistan’s role in Kashmir, was quick to hit back. “They didn’t even condemn the attack. And now, they want to offer a ‘neutral’ investigation?” he said in a strongly worded statement. “If Pakistan is so concerned about what happened in Pahalgam, why don’t they condemn it first? Why don’t they make it.

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Abdullah’s statement reflects the deep frustration felt by many in Jammu and Kashmir, who believe that Pakistan’s offer is nothing more than a distraction from its own involvement in cross-border terrorism. The former Chief Minister further was a deliberate attempt to deflect attention from the fact that the attack.

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