Alkali-silica reaction (ASR) is a deleterious expansive reaction which occurs in concrete. The goal of this research is to extend the service life of concrete transportation structures (median barriers and pavements) effected by ASR through surface treatment mitigation. The goal was achieved through instrumentation and treatments of a concrete median barrier to measure strain and relative humidity. Strain was measured with detachable mechanical strain gages and gage studs embedded into the concrete. Relative humidity was measured with a portable probe inserted into the concrete. Surface treatments were applied to the concrete and included silane, linseed oil, and elastomeric paint. Results show that silane is effective at reducing internal relative humidity below the recommended threshold of 80 percent in concrete which exhibits minimal cracking. In concrete with moderate or severe cracking elastomeric paint is more effective at controlling expansion.
展开▼
