A pair of rapid tests for evaluation of the effectiveness of penetrating sealers in preventing corrosive chloride ions from penetrating concrete have been developed. The tests are designed to yield an indication of the relative performance of a sealer as compared with unsealed concrete. The first test is based on measurement of electrical resistance between two small electrodes created on a concrete surface by use of a highly conductive spray-applied coating. A criterion of 200 k-ohms after 4 minutes of test was selected for differentiating between effective and ineffective sealers. The second test is based on absorption of water into the concrete surface over a four minute period. Development and field trials of the two tests are described. The tests are applicable to both horizontal and vertical surfaces. Applications for the tests include quality control of sealer application, qualification of sealers under field conditions, and monitoring of sealer performance over time in a nondestructive manner.
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