All things in polished concrete relate to physics and chemistry. With that in mind, let’s look at how moisture interacts with concrete and polishing chemicals, with an additional focus on efflorescence.
Moisture in concrete can be measured as a moisture vapor emission rate, or MVER, and as in situ relative humidity, or RH. Just as concrete density and porosity affect the absorption of densifier and colorants, the porosity of a slab will also affect MVER and RH readings. The moisture level in turn can affect the vibrancy and staying power of topical color, the penetration of densifier, the clarity of shine, the strength development of concrete, and the appearance (differential cure marks) and level of efflorescence.