ASR leads to expansive products that can cause extensive cracking in concrete structures. The alkalies (potassium and sodium ions) in the cement paste react with reactive (amorphous) silica particles in fine or coarse aggregate and cause expansion and cracking..
To reduce the risk of ASR in new concrete structures, the quantity of sodium and potassium ions in the cement paste of fresh concrete should be reduced so as not to exceed the critical limit defined in standards, guidelines or particular project specifications.
The RAT measures the amount of sodium and potassium ions in fresh concrete or in its constituents and can also be used for testing powder samples of hardened concrete.

Rapid Alkali Content Test.

• Optimization of concrete mixtures against ASR
• Quality Control
• Assessment of existing concrete suspected of presenting ASR problems

Rapid Alkali Content Test.

• Input Impedance: 1,012 Ohm
• Battery Type / Life: 1 x 9V / approx. 150 hours
• Auto-off after 20 minutes of non-use
• Environment: 0 to 50°C; RH max 95%
• Temperature and pH measuring capacity (pH electrode and temperature probe are sold separately)
• Range: ±1,999 mV
• Resolution: 0.1 mV for ±700 mV and 1 mV for ±2,000 mV
• Accuracy: 0.2 mV for ±700 mV and 1 mV for ±2,000 mV

Rapid Alkali Content Test.

Ordering Numbers:

Item	Order #
K+ electrode	RAT-700
Spare cover for K+ electrode	RAT-701
Na+ electrode	RAT-800
Spare cover for Na+ electrode	RAT-801
Reference electrode	RAT-900
Holster for electrodes	RAT-910
Electrometer w. spare battery	RAT-950
Adaptor switch box	RAT-960
Wetting agent for K+ electrode	RAT-970
Wetting agent for Na+ electrode	RAT-980
Wetting agent for ref. electrode	RAT-990
Set of filling syringes, three	RAT-1005
Spray bottle with distilled water	RAT-1010
Calibration liquid # 1	RAT-1020
Calibration liquid # 2	RAT-1030
Calibration liquid # 3	RAT-1040
Cleaning tissues	RAT-1050
Calibration sheets, 30 pcs	RAT-1060
Data sheets, 30 pcs	RAT-1070
Pencils (black and red) and ruler	RAT-1080
Spatula, 5 pcs	RAT-1090
Safety goggles	RAT-1100
Rubber gloves	RAT-1110
Mixing container	RAT-1120
Sampling cup for fresh concrete	RAT-1130
Plastic lid with holes for electrodes	RAT-1140
Temperature probe	RAT-1150
Vials for hardened concrete	RAT-1160
Vials for fresh concrete	RAT-1170
Manual	RAT-1180

• Technical datasheet

ASTM C114: “Standard Test Methods for Chemical Analysis of Hydraulic Cement”

ASTM C1778: “Standard Guide for Reducing the Risk of Deleterious Alkali-Aggregate Reaction in Concrete”