Onsite RAP Crushing with Eagle Crusher Equipment: Lindy Paving’s Strategy for Asphalt Recycling Efficiency

In the asphalt paving industry, efficiency and quality control are essential to delivering durable, cost-effective pavements. Contractors and producers alike are constantly seeking ways to optimize material production while maintaining strict quality standards. One proven strategy that has gained significant traction is the onsite recycling of reclaimed asphalt pavement (RAP) using purpose-built crushing equipment. Companies such as Lindy Paving have demonstrated how integrating Asphalt Plants and Pavement Construction Equipment a Complete approach with dedicated crushers can transform RAP into a consistent resource for new asphalt mixes. This article examines how Eagle Crusher equipment enables Lindy Paving to crush RAP onsite, the operational benefits, and key considerations for producers considering similar systems.

The Case for Onsite RAP Crushing at Lindy Paving

Lindy Paving, headquartered in New Galilee, Pennsylvania, is a member of the PJ Dick-Trumbull-Lindy Paving family of companies. The organization operates six asphalt plants in total, with five located across Pennsylvania in Pittsburgh, Neville Island, Kopple, Zelienople, and New Kensington, and one in Homer City, Indiana. These plants produce asphalt for a wide range of project types, from private developments to commercial sites and government infrastructure work.

Currently, 25 percent of the asphalt produced at Lindy Paving plants is warm mix asphalt (WMA), and every mix produced, including WMA, incorporates RAP. This makes the consistent, high-volume production of quality RAP a critical part of their operation.

From Breakers to Dedicated Crushers

In 2003, Lindy Paving purchased its first Eagle Crusher unit for one of its smaller plants. Prior to this acquisition, the company relied on breakers, which were small breaking machines that handled the material but at limited capacity and speed. According to Paul Reiner, general plant manager of plant operations for Lindy Paving, the difference was substantial.

“Prior to purchasing the Eagle Crusher equipment we used breakers , little breaking machines. They were really small and worked ok, but that equipment didn’t do as good of a job. With the Eagle Crusher we were able to crush a lot more material at a faster pace.”

Paul Reiner, General Plant Manager, Lindy Paving

Since finding success with onsite crushing, Lindy Paving added similar Eagle Crusher systems at the Pittsburgh, Neville Island, and Kopple plants. These are the newest in the organization, with Pittsburgh and Neville Island at about four years old and Kopple at about one year.

Material Sources and Volume

The RAP processed at these plants comes from two primary sources: Lindy Paving’s own milling and demolition projects, and materials delivered by outside contractors. Sources include city streets, state highways, municipality projects, and commercial parking lots. This diversity ensures a steady material supply throughout the construction season.

Eagle Crusher Equipment Configuration and Capabilities

Understanding the equipment configuration that makes onsite RAP crushing successful is important for any producer evaluating similar investments. Lindy Paving’s setup is built around three Eagle Crusher systems tailored to the capacity of each plant.

Together, this equipment enables Lindy Paving to produce up to 200 tons per hour of RAP across the three plants. The selection of crusher and screen sizes is matched carefully to each plant’s production capacity, ensuring the crushing operation does not become a bottleneck.

How the Crushing Process Works

The crushing process follows a streamlined, closed-loop workflow:

1. Millings and RAP material, ranging in size from fine particles to pieces as large as 6 inches, are loaded into feed bins.
2. The material travels up the conveyor belt to the triple-deck screen, which separates it by size.
3. Material that meets the required specification passes through the screen and moves to the plant for mix production.
4. Oversized aggregate that does not pass through the screen is directed to the Eagle Crusher impactor.
5. The crusher reduces the oversized material to the correct specification, after which it is returned to the same conveyor belt and moved into the plant.
6. Any oversize material that remains after crushing is routed back through the system in a continuous loop.

This closed-loop design eliminates the need for pre-crushing, which is a significant advantage. Reiner explains that the system accepts material directly without requiring an initial reduction step, saving both time and handling costs.

Key Operational Benefits of Onsite Crushing

Lindy Paving’s experience with Eagle Crusher equipment illustrates several tangible benefits that producers can achieve by bringing RAP crushing capabilities in-house. These advantages extend beyond simple cost savings and touch on quality control, logistics, and operational flexibility.

Reduced Material Handling

One of the greatest benefits Reiner cites is the reduction in material handling requirements. Before investing in dedicated crushing equipment, producers face an inefficient multi-step process:

• RAP must be stockpiled in a holding area.
• An outside crushing company must be contracted and scheduled.
• The material must be moved to a separate crushing location.
• After crushing, the processed RAP must be moved again and reloaded into the plant feed system.

By integrating the crushing equipment directly into the plant layout, Lindy Paving has eliminated the double and triple handling of material. Reiner notes that outsourcing adds time, cost, and complexity. With the Eagle Crusher system, RAP moves from delivery to screen to crusher to plant in a single, continuous flow.

Cost Savings and Schedule Control

Eliminating the need to rent a crusher or hire an outside contractor translates directly to bottom-line savings. Producers who rely on third-party services are subject to their availability, pricing, and scheduling. By bringing the operation in-house, Lindy Paving maintains full control over RAP processing, ensuring consistent supply of recycled material when needed.

Quality Control Over RAP Gradation

Consistent RAP quality is essential for asphalt mixes that meet specification requirements. With the Eagle Crusher system, Lindy Paving monitors and controls RAP gradation more aggressively than with outsourced crushing. The triple-deck screening system produces precise particle sizes for each mix design, and closed-loop crushing ensures oversize material is reduced before entering the mix.

For producers interested in learning more about RAP as a material, Reclaimed Asphalt Pavement offers a comprehensive overview of its properties, processing methods, and applications in new pavement construction.

Selection Criteria and Maintenance Considerations for Crushing Equipment

For producers considering the addition of onsite RAP crushing capabilities, Paul Reiner offers practical advice based on Lindy Paving’s years of operational experience. The decision involves matching equipment specifications to plant capacity, configuring the layout for efficiency, and committing to a regular maintenance program.

Screen Size Is Critical

“The size of the screen is very important,” Reiner says. “When purchasing a screen it depends on the amount of material you want to crush. The one thing you don’t want to do is undersize the screen. Every plant size is different, so the size of crushing equipment should be consistent with the size of the plant.”

Undersized screens create bottlenecks that limit RAP throughput and constrain overall asphalt production. The screen must be large enough to handle the full RAP volume with additional capacity for peak demand periods.

System Layout and Flow Design

Equipment layout has a significant impact on overall efficiency. Lindy Paving’s systems are arranged in a loop configuration so oversize material from the screen routes directly back into the crusher without manual intervention. This design minimizes downtime and maximizes utilization of both screen and crusher.

When planning a system layout, producers should consider:

• Conveyor routing that minimizes transfer points and material drop heights to reduce segregation and degradation.
• Adequate space around the crusher and screen for maintenance access and blow bar replacement.
• Integration with existing plant feed systems so processed RAP flows directly into the mix production line.
• Stockpile management for raw RAP and processed material to avoid cross-contamination.

For a broader perspective on the machinery used in road construction and surface treatment, see Pavement Construction and Asphalt Equipment a Complete Guide.

Routine Maintenance Practices

As with any piece of heavy equipment, consistent maintenance is the key to reliable performance and long service life. Reiner emphasizes that the crusher requires the same disciplined approach to upkeep as any other plant component.

• Oil changes: Regular oil changes at the intervals specified by the manufacturer keep the crusher’s internal components lubricated and operating at proper temperatures.
• Greasing: Bearing points and pivot locations require regular greasing to prevent wear and contamination.
• Screen deck replacement: Screen decks wear over time and must be inspected and replaced periodically to maintain proper material sizing.
• Blow bar maintenance: Inside the crusher, blow bars (or blow horns) are the components against which material is impacted for reduction. These wear parts must be inspected, rotated, or replaced before they wear through to the rotor, which is a much more expensive component to repair or replace.

Reiner puts it simply: “It’s just like any other piece of equipment: if you take care of it, it will take care of you.”

Steps to Get Started with RAP Recycling

Producers can take a phased approach to RAP crushing. Starting with a single crusher at one plant, as Lindy Paving did in 2003, allows a company to develop expertise before scaling up. Key evaluation steps include:

1. Assess the volume of RAP material available from company projects and external sources to determine required throughput capacity.
2. Match crusher and screen specifications to the production capacity of the target asphalt plant.
3. Design the system layout to minimize material handling and enable closed-loop crushing of oversize material.
4. Budget for initial wear parts inventory and establish a preventive maintenance schedule before commissioning the equipment.
5. Train plant personnel on proper operation, screen changes, and blow bar inspection procedures.

For a deeper dive into the various methods and technologies available for recycling asphalt materials, refer to Asphalt Pavement Recycling Technologies Methods and Sustainable Practices.

Conclusion

Lindy Paving’s experience with Eagle Crusher equipment demonstrates that onsite RAP crushing is an effective strategy for improving efficiency, reducing costs, and maintaining quality control. By investing in dedicated crushing and screening equipment, the company eliminated outsourced crushing inefficiencies, reduced material handling, and can produce specification-grade RAP at up to 200 tons per hour across its plants.

The lessons from Lindy Paving’s operation are clear: matching screen size to plant capacity, designing a closed-loop system layout, and committing to regular maintenance are the pillars of a successful RAP crushing program. For producers relying on breakers or third-party services, the investment in equipment such as the Eagle Crusher UM series can pay dividends in both efficiency and product quality. Onsite RAP recycling with dedicated crushing equipment remains a cornerstone of modern asphalt production.