![](https://recyclingfirst.org/wp-content/uploads/2023/03/crf-15-825x340.png)
The W Philadelphia Hotel
As of 2018, this hotel was the largest concrete structure in Philadelphia’s history. It has a nine-foot-thick foundation that covers 20,000 square feet, instead of slag or silica being used, they were able to use Fly Ash.
- On March 13, 2023