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While completing concrete repairs, is it necessary to remove sound concrete if a nearby reinforcing bar exhibits rust? Can terms like corrosion or rust be used interchangeably? This month’s Q&A provides answers to these questions as well as a discussion on various factors influencing the extent of a repair of corrosion-related damage in concrete structures.
Available in the following language(s): Spanish
This is the third article in a five-part series. While Parts 1 and 2 review the procedure and basis for computing deflection of reinforced concrete with a new expression for the effective moment of inertia Ie first adopted in ACI CODE-318-19, this article examines the implications of this change for satisfying deflection limits of beams and one- and two-way slabs. A need is seen to revise current minimum thickness values for beams.
Available in the following language(s): Spanish
Abrasion caused by moving equipment or flowing water can wear away concrete’s surface and render it unfit for service. Kryton International’s Hard-Cem®, an integral hardening admixture based on a unique mineral-metal particle, offers a solution. Its tough microstructure can double the resistance of concrete to abrasive and erosive wear.
Available in the following language(s): Spanish
This article introduces the latest fiber-reinforced polymer panel system developed by the author—SPiRe®+. These panels can serve as formwork, corrosion resistant reinforcement, and waterproofing. With their flat and smooth exterior face and protruding T-profiles on the interior face, the panels act as reinforcing elements for strengthening beams, slabs, and walls.
Available in the following language(s): Spanish
In August 2024, ACI published ACI PRC-ITG-11-24: Statistical Techniques for Assessment of Existing Concrete Structures—Report. This document, prepared by Innovation Task Group 11, which was created by the ACI Technical Activities Committee, provides information on using statistical techniques to evaluate condition and reliability of concrete structures and assessing possible repair options.
Available in the following language(s): Spanish