Rapid Alkali Test

The RAT (Rapid Alkali Test) measures the amounts of sodium and potassium ions that may contribute to alkali-silica reaction (ASR), which is harmful to concrete structures.

The RAT (Rapid Alkali Test) measures the amounts of sodium and potassium ions that may contribute to alkali-silica reaction (ASR), which is harmful to concrete structures.

The RAT (Rapid Alkali Test) measures the amounts of sodium and potassium ions that may contribute to alkali-silica reaction (ASR), which is harmful to 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, provided sufficient moisture is present.

To reduce the risk of ASR in new concrete structures, the quantity of sodium and potassium ions in the cement paste of fresh concrete may be lowered so as not to exceed the critical limit defined in the project specifications.

The RAT measures the amount of sodium and potassium ions in the fresh concrete or in its constituents. The test may also be used for testing powder samples of hardened concrete.

 

Germann Instruments, Denmark

Germann Instruments, Denmark

Germann Instruments has been the leader in the field of test systems for non-destructive (NDT), on-site investigation of reinforced concrete structures for over quarter of a century.

Germann Instruments constantly develops, manufactures and markets its innovative and cutting-edge product line worldwide

 

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