RAT
RAT
The RAT (Rapid Alkali Test) is a portable kit that measures the amounts of sodium and potassium ions that contribute to deleterious alkali-silica reaction (ASR) if reactive aggregates are present in concrete.
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 |
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”