ACI - American Concrete Institute
From the ACI website:
"Founded in 1904 and headquartered in Farmington Hills, Michigan, the American Concrete Institute is advancing concrete knowledge by conducting 125 seminars annually, managing 14 different certification programs, publishing more than 400 technical documents, and offering scholarships to students in the field. With 98 chapters and about 15,000 members spanning 108 countries, the American Concrete Institute has always retained the same basic mission—to develop, share, and disseminate the knowledge and information needed to utilize concrete to its fullest potential."
Please refer to the 'Approvals' page of the listed locations for the exact scope of the approvals.
Links:
Locations: