How do precast concrete noise barriers perform when exposed to corrosive agents or repeated freeze-thaw cycles?
Precast concrete mix designs are formulated to provide an economical and durable finished concrete product. Mix designs can easily be adjusted to account for various levels of anticipated exposure to corrosive agents such as salts. Precast concrete noise barriers are manufactured with a low water-to-cement ratio, which typically contains an air-entraining admixture. By utilizing a low water-to-cement ratio, higher strengths and a lower permeability can be achieved. Purposely entrained air voids provide additional space for freezing water to expand, minimizing the potential for scaling and deterioration of the concrete.
