This depends on many factors such as type of concrete and method of construction, and texturing of the surface. Also friction of any pavement surface changes by time as a function of traffic and climatic factors. The best way is to measure this properties in field.

The coefficient of friction between precast and cast in situ concrete surfaces can vary depending on many factors such as the type of concrete, surface roughness, moisture content, etc. However, a typical range of coefficients of friction between these surfaces is 0.4 to 0.6. It is important to note that these values are only approximate and may vary depending on the specific conditions of the contact surface.