ACE Auto-Grav Laboratory™
The ACE Auto-Grav Laboratory is a portable, self-contained laboratory testing unit similar in dimension to the ACE Auto-Grade Laboratory. The primary difference between the two units is while the Auto-Grade conducts tests relative to the classification of the materials, the ACE Auto-Grav Laboratory conducts tests related to densities and gravities hence its name Auto-Grav . The targeted test objective of the ACE Auto-Grav Laboratory is the ability to work side by side with the Auto-Grade Laboratory thereby encompassing 90% of the required testing of aggregate materials tests in full automation while remaining portable.
While the units will appear similar in construction, there are some drastic differences. The ACE Auto-Grav Laboratory has been designed to determine the following:
- Absorption – the increase in the mass of aggregate due to water being absorbed into the pores of the material, but not including water adhering to the outside surface of the particles, expressed as a percentage of the dry mass.
- Saturated Surface Dry (SSD) – condition of an aggregate particle when the permeable voids are filled with water, but no water is present on exposed surfaces.
- Specific Gravity – the ratio of the mass, in air, of a volume of a material to the mass of the same volume of gas-free distilled water at a stated temperature.
- Apparent Specific Gravity (Gsa)– the ratio of the mass, in air, of a volume of the impermeable portion of aggregate to the mass of an equal volume of gas-free distilled water at a stated temperature.
- Bulk Specific Gravity (Gsb)– the ratio of the mass, in air, of a volume of aggregate (including the permeable and impermeable voids in the particles, but not including the voids between particles) to the mass of an equal volume of gas-free distilled water at a stated temperature.
- Bulk Specific Gravity (SSD) (Gsb SSD) – the ratio of the mass, in air, of a volume of aggregate, including the mass of water within the voids filled to the extent achieved by submerging in water for 15 to 19 hours (but not including the voids between particles), to the mass of an equal volume of gas-free distilled water at a stated temperature.
The ACE Auto-Grav Laboratory is anticipated to be formally launched in 2017.
The ACE Auto-Grav Laboratory®, combined with the ACE Auto-Grade Laboratory® and the integrated ACE Advantage software solution will equip users with a completely integrated, automatic testing solution for the vast majority of their aggregate testing requirements.