The permeable coefficient, also known as the permeability coefficient or hydraulic conductivity, is a critical parameter that measures the ability of concrete to allow fluids, typically water, to pass through its pores. This property is essential for assessing the durability and performance of concrete structures, especially in environments exposed to water, chemicals, and other fluids. Low permeability is desired to minimize the ingress of harmful substances that can cause deterioration, such as chlorides, sulfates, and aggressive gases.