The test sections in all four States were monitored annually for 5 years, from 1994 through 1998. The monitoring was done by Long-Term Pavement Performance (LTPP) visual surveys, faulting measurements, relative humidity testing, petrographic examination, and compressive strength and elastic modulus testing. Falling Weight Deflectometer (FWD) testing was also performed at all four test sites. This report describes and quantifies the differences between test sections and the results of the various treatments used.
 

Distress in portland cement concrete (PCC) pavements can be caused by aggregate that is reactive to alkalies in the environment. The Federal Highway Administration (FHWA) monitored test sections of various treatments designed to mitigate this type of distress in PCC pavements that contained aggregates known to be reactive with alkalies. The pavement treatments were part of the Strategic Highway Research Program (SHRP). The test sections were located in California, Nevada, New Mexico, and Delaware. Three pavement sites had suffered some degree of distress due to alkali-silica reaction (ASR) prior to treatment, and one pavement was newly constructed with known reactive aggregates.