Be wary of free “pirated” PDFs circulating online. They are often outdated (e.g., a 1988 edition), missing crucial updates on safety factors, and illegal. The correct way to obtain SP-4 is through the ACI’s website (concrete.org) as a multi-user license or individual PDF download.
This article describes the contents and significance of ACI SP-4. The document is protected by copyright held by the American Concrete Institute (ACI). While we discuss the PDF format, we do not host or provide unauthorized copies. To obtain the official PDF, you must purchase it from the ACI website or access it through institutional subscriptions. ACI SP 4 Formwork For Concrete Pdf