Final answer:
Perlite density in Group I lightweight concrete typically ranges between 15 and 50 pcf. This type of concrete is known for its reduced load and thermal protection, making it a reliable choice for modern construction.
Step-by-step explanation:
The density of perlite used in Group I lightweight concrete typically ranges between 15 and 50 pcf (pounds per cubic foot). This type of concrete is part of the lightweight concrete family, which has been used in construction for centuries. Modern advances in the past century have made it more reliable and predictable, solidifying its role in the industry. Lightweight concrete is made of a mixture of lightweight coarse aggregate with fine aggregates like shale, clay, or slate. It offers significant benefits such as reduction of load on structures, allowing for faster construction rates. It is also more durable and provides excellent thermal protection, especially when compared to traditional materials like brick.