Comprehensive Guide to "ACI SP 4 Formwork For Concrete": Principles, Practices, and Resources
American Concrete Institute. (current edition). SP-4: Formwork for Concrete . Farmington Hills, MI: ACI. OSHA 1926 Subpart Q – Concrete and Masonry Construction. ACI Committee 347. (2014). Guide to Formwork for Concrete (ACI 347-14) .
, often referred to as "Hurd's Formwork for Concrete" (after its original author, M.K. Hurd), is a practical, detailed guide published by the American Concrete Institute (ACI). It interprets and expands upon the official ACI 347R (Guide to Formwork for Concrete) , offering engineering design calculations, construction techniques, and safety standards. ACI SP 4 Formwork For Concrete Pdf
Engineers and site superintendents can access complex pressure charts and bracing diagrams instantly on tablets or smartphones directly at the construction site.
Published by the American Concrete Institute (ACI), this manual—often referred to simply as “SP-4”—is the definitive guide to the design, erection, use, and removal of formwork systems. While the ACI 347 committee produces the industry standard “Guide to Formwork for Concrete” (ACI 347), SP-4 serves as its comprehensive companion handbook, bridging theoretical standards with practical application. Comprehensive Guide to "ACI SP 4 Formwork For
Key chapters and sections include:
Calculating the exact pressure exerted by fresh, wet concrete on the form faces is arguably the most vital step in formwork design. Fresh concrete behaves like a fluid until it begins to set, exerting hydrostatic pressure. ACI SP-4 provides empirical formulas and tables for calculating these lateral pressures, factoring in variables such as: Rate of concrete placement Concrete temperature Concrete weight and consistency The use of admixtures or pozzolans 3. Shoring and Reshoring Multi-Story Buildings Farmington Hills, MI: ACI
Aligns with ACI 347 (Guide to Formwork for Concrete), the governing standard. Core Principles Covered in the ACI SP-4 Manual
When constructing high-rise slabs, loads from newly placed concrete must be distributed down through partially cured floors below. SP-4 contains the widely used “reshores and backshores” design methods, preventing collapse during sequential floor construction. The PDF version includes clarity on the number of levels of shores and reshores required for a given slab thickness and concrete strength gain.