The exposure of concrete to water that is rich in certain minerals can pose a durability challenge, and that is well known to hot spring pool operators. The chlorination and settling tank at this particular hot spring showed excessive spalling at the waterline, a symptom likely resulting from both the minerology of the spring water, and porous nature of the unsealed concrete, leading to those dissolved minerals chrystallizing within the concrete near the water surface.
Headwall Engineering completed a condition assessment of this concrete tank and its surrounding structures. Due to operational constraints, the owner wished to keep the tank in service for a short period before completed a complete replacement. As such, Headwall Engineering completed the design of a repair program, and oversaw the implementation of these repairs on site to facilitate the extension of this tank’s life.
Structural condition assessments at routine intervals are important for preventing such advanced decay as observed here.