Which of the following is NOT a problem associated with excess moisture in concrete?

The option indicating "Improved finish quality" stands out as it reflects a condition that does not arise from excess moisture in concrete. When concrete retains excess moisture, it typically leads to various detrimental effects, including efflorescence, which is the white, powdery substance that forms on the surface, caused by the movement of soluble salts to the surface of the concrete as it dries. Additionally, excess moisture can foster microbial growth on other materials, such as carpets or drywall, which can lead to health risks and further structural issues. It can also cause deterioration of applied finish floors, resulting in peeling, bubbling, or other forms of damage that compromise the integrity and aesthetic of the flooring. Thus, while excess moisture can lead to a range of problems, it is not associated with an improvement in finish quality, making this choice the correct answer.