CoreLok® Asphalt Density Measurement System - by InstroTek

The InstroTek CoreLok is a vacuum-sealing system designed for accurate density and specific-gravity testing of asphalt mixtures and aggregates. By sealing specimens in specialized polymer bags, CoreLok allows specimen volume to be determined by water displacement while preventing water from entering porous or absorptive samples, making it particularly valuable for mixtures where conventional SSD techniques can introduce significant variability.

Key Features

• Meets ASTM D6752 and AASHTO T 331 for bulk specific gravity, ASTM D6857 for maximum specific gravity, ASTM D7063 for porosity, and ASTM D7370/D7370M for aggregate specific gravity and absorption applications
• Determines bulk specific gravity of compacted asphalt specimens
• Particularly useful for SMA, OGFC, and absorptive mixtures
• Supports maximum specific gravity testing of loose asphalt mixtures
• Supports aggregate apparent specific gravity, bulk specific gravity, and absorption testing
• Can be used for determining compacted-asphalt porosity
• Automatic vacuum sealing reduces operator dependency
• Eliminates many of the difficulties associated with manually sealing specimens using wax or film
• GravitySuite software supports CoreLok calculations and data management

Included Items

CoreLok vacuum chamber and automatic sealing system. GravitySuite software supports the CoreLok testing workflow. CoreLok bags and application-specific accessories should be selected according to the test method and specimen being evaluated.

Typical Applications

Bulk specific gravity of compacted asphalt, maximum specific gravity of asphalt mixtures, SMA and OGFC density testing, aggregate specific gravity and absorption, asphalt specimen porosity, asphalt mix design, production QC/QA, and pavement-materials research.

Lab Manager's Tip

CoreLok is especially valuable when conventional SSD testing becomes difficult to reproduce because the specimen absorbs or drains water during measurement. Laboratories routinely working with SMA, OGFC, highly absorptive aggregates, or other porous mixtures can benefit significantly from the controlled vacuum-sealing approach.

• User Manual
• Warranty Information
• CoreLok.pdf