Authorized digital PDF versions are sold directly through the American Concrete Institute (ACI) Bookstore.
The document's current authority rests firmly on its (designated SP-4(14)), published in 2014. Authored by Professor David W. Johnston of North Carolina State University, this edition marked the 50th year of the manual's publication and was the culmination of a major, multi-year revision effort.
Formwork is a temporary structure used to support and shape concrete during the construction process. It is a crucial element in concrete construction, as it helps to ensure that the concrete is poured into the correct shape and position. ACI SP 4 Formwork For Concrete Pdf
One of the most dangerous assumptions in concrete work is underestimating lateral pressure on vertical formwork. SP-4 provides detailed formulas for calculating hydrostatic head, including adjustments for concrete density, temperature, placement rate, and set-retarding admixtures. Using these tables, an engineer can determine safe rates of pour without risking a blowout.
), causing lateral hydrostatic pressure to burst the wall ties. 4. Architectural Concrete Requirements Authorized digital PDF versions are sold directly through
The inclusion of retarders, fly ash, or slag which keep concrete fluid longer. Material Properties and Allowable Stresses
Ideal for high-reuse modular systems and heavy civil engineering projects. Johnston of North Carolina State University, this edition
The manual is available in or as a protected PDF/Web View through the ACI Store and retailers like Builder's Book or Construction Book Express.
Formwork must withstand immense pressure while remaining cost-effective. SP-4 evaluates the engineering properties and trade-offs of various materials:
Preferred for heavy civil engineering, high-rise construction, and modular systems due to their high strength-to-readiness ratio and durability over hundreds of reuses.
Removing forms too early can cause structural failure or surface sagging. The manual provides guidance on: Minimum time requirements before stripping forms.