The friction coefficient between aluminium and concrete can vary depending on various factors such as the surface conditions, lubrication, and load applied. Generally, the coefficient of friction between aluminium and concrete falls within the range of 0.6 to 0.8. However, it's important to note that these values are approximate and can differ based on the specific circumstances and materials involved. If you require a more precise friction coefficient for a particular application, it's advisable to conduct specific friction tests or consult relevant engineering references and standards.