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This month’s Q&A discusses changes in ACI CODE-318-25 for coefficient of friction for concrete placed against hardened concrete that is clean, free of laitance, and not intentionally roughened, as well as new provisions for determining if an intentionally roughened surface meets the 1/4 in. roughness specified in Table 22.9.4.2.
Available in the following language(s): Spanish
For all concrete structures, cost effectiveness is heavily influenced by the timing of formwork cycling. For post-tensioned structures, review and approval of elongation records is a critical step within each formwork cycle. This article explores the timeliness of reviews, purpose of elongations and tolerances, evaluation of stressing records, and reasonable expectations for all stakeholders.
Available in the following language(s): Spanish
An improvement project on a 23-mile (37 km) section of Interstate 17 (I-17) in Arizona, USA, includes widening of 15 miles (24 km) of roadways, replacing two bridges, widening of 10 additional bridges, and constructing 8 miles (13 km) of flex lanes. PERI USA provided customized and fully rentable formwork/falsework for concrete construction on this project.
Available in the following language(s): Spanish
Concrete columns are traditionally produced by placing concrete into a mold or form. Assembling and then removing the formwork takes time and labor; and eventual replacement of the formwork leads to increased material use and transport costs. A new alternative, a permanent three-dimensionally (3-D) printed concrete form in which a core is cast with self-consolidating concrete, was investigated in this project.
Available in the following language(s): Spanish
This article, the fourth in a five-part series on calculating deflections using a new expression for the effective moment of inertia Ie introduced into ACI CODE-318-19, provides a deflection example. The example follows the procedure outlined in Part 1 to compute the deflection of reinforced concrete (nonprestressed) one-way slab with both ends continuous.
Available in the following language(s): Spanish