What is the purpose of pre-wetting SALT with calcium?

The purpose of pre-wetting salt with calcium primarily centers on its enhanced effectiveness at lower temperatures. When salt is applied to icy surfaces, its effectiveness tends to decrease as temperatures drop. By pre-wetting the salt, typically with calcium chloride, you create a brine solution that can initiate melting ice more effectively at these lower temperatures compared to dry salt alone.

The calcium in the mixture helps to accelerate the melting process and facilitates the salt's ability to lower the freezing point of water. This means that when wet salt is applied, it can immediately start working, rather than waiting for weather conditions to change or for the salt to absorb moisture from the environment.

Understanding this process is vital for public works managers as it can influence the efficiency and effectiveness of winter road maintenance strategies. This approach not only improves safety on roadways but also optimizes the use of materials, making operations more economical and effective.