Final answer:
Insulating concrete is a lightweight concrete with Perlite as the aggregate.
Step-by-step explanation:
Insulating concrete is a lightweight concrete that is used to reduce heat transfer and provide thermal insulation. The aggregate used in insulating concrete is Perlite. Perlite is a lightweight volcanic glass that is expanded by heating it, resulting in a porous and lightweight material. When mixed with concrete, it helps to reduce the weight of the concrete and improve its insulating properties.