Worksafe - Core Drill Asphalt: Function, Process, and Safety Aspects

What is Core Drill Asphalt?

Core Drill Asphalt is a method of extracting asphalt samples from pavement layers using a core drilling machine. The machine is equipped with a cylindrical diamond-tipped drill bit that cuts through the asphalt precisely. The result is a cylindrical sample, known as a core sample.

These core samples are then taken to the laboratory to be tested for:

• Density

• Asphalt content

• Stability and durability

• Layer thickness

Functions of Core Drill Asphalt

1. Quality Control
   To ensure that hot mix asphalt (HMA) meets project specifications.

2. Road Condition Evaluation
   Used in road inspections to analyze cracks, deformation, and overall pavement durability.

3. Planning Data
   Helps engineers determine the need for overlays or pavement rehabilitation.

4. Technical Evidence
   Serves as valid documentation in project audits and quality assurance.

Core Drilling Process

1. Site Preparation

   • Identify drilling points based on project drawings or random sampling.

   • Mark and secure the work area.

2. Machine Setup

   • Position the core drill machine stably on the drilling point.

   • Connect the water tank for drill bit cooling.

3. Drilling

   • Apply steady downward pressure with controlled rotation.

   • Supply water to prevent overheating and preserve sample quality.

4. Sample Extraction

   • Carefully remove the core sample to avoid cracks.

   • Label each sample with location, date, and depth.

5. Finishing

   • Temporarily patch the hole with cold mix asphalt to keep the road safe for traffic.

Safety Aspects (K3)

Core drilling asphalt involves risks if not performed correctly. Key safety measures include:

• Mandatory PPE: Helmet, reflective vest, gloves, safety glasses, and safety boots.

• Traffic Management: Use warning signs, traffic cones, or flagmen to control vehicle flow.

• Machine Operation: Only trained operators should handle the machine and monitor the cooling system.

• Hazard Control: Avoid direct contact with the drill bit, check cables, and ensure equipment is in good condition.

Conclusion

Core Drill Asphalt is an essential method for quality control and road pavement evaluation. When performed correctly and with proper safety measures, it provides accurate data without compromising worker or road user safety.

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