Alkali Aggregate Reaction Bath

About Alkali Aggregate Reaction Bath

An alkali aggregate reaction (AAR) bath is a lab device that maintains specimens in a solution (often

NaOHcap N a cap O cap H

) at a controlled temperature, typically between ambient and

100C100 raised to the composed with power cap C

100

. Key specifications include stainless steel construction, digital temperature control with accuracy of about

1C1 raised to the composed with power cap C

1

, a capacity for multiple specimens, and the ability to hold samples that are

252528525 cross 25 cross 285

2525285

mm. These baths are used for accelerated testing, such as those outlined in ASTM standards, to assess the potential for AAR in concrete aggregates.

• Construction: Stainless steel with a glass cover is common for durability and visibility.
• Temperature Control: Digital thermostat with a sensor to control temperature accurately, often between ambient and
  

  100C100 raised to the composed with power cap C

  100
  , with a
  

  1C1 raised to the composed with power cap C

  1
  accuracy.
• Specimen Capacity: Designed to hold numerous specimens, often with racks that keep them in a vertical position.
• Specimen Size: Standard specimens are
  

  252528525 cross 25 cross 285

  2525285
  mm.
• Accessories: Includes a stainless steel hanger for specimens and stainless steel alkali specimens cans.
• Safety Features: May include an electronic water level indicator that alarms when the water is too low.
• Purpose: Used for accelerated testing of the potential alkali reactivity of cement-aggregate combinations.