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This month's Q&A focuses on requirements for checking flatness of suspended slabs. It discusses the time limit for measuring floor flatness after finishing, compliance requirements for the manual straightedge method, minimum number of samples, and sample distribution, as well as possible remedies for noncompliance.
Available in the following language(s): Spanish
The article discusses field evidence, available test data, and a simple mechanical construct all suggesting that 1× √f’ c can be used as a pragmatic lower bound to shear strength of reinforced concrete beams and one-way slabs without transverse reinforcement, at least within certain ranges.
Available in the following language(s): Spanish
Formed and unformed surfaces (exterior and interior walls, floors, and ceilings) can be specified as architectural concrete. However, the visual inspection criteria—viewing distance and lighting—appear to apply only to exterior walls. It is unclear how to interpret a 20 ft (6 m) viewing distance for a floor or ceiling, and what light to use for an interior visual inspection.
Available in the following language(s): Spanish
Fortera has opened its first industrial green cement and carbon mineralization facility in North America. The plant will capture carbon dioxide (CO2) emitted during cement production and permanently sequester it by mineralizing the CO2 into ready-to-use cement and cement that can be blended with ordinary portland cement to improve early concrete strength and flow.
Available in the following language(s): Spanish
With graceful curves and sleek lines, Una Residences is a new addition to the Miami, FL, USA, skyline. To establish an efficient and effective forming process, the concrete contractor turned to engineering support from Doka. Formwork systems from Doka were selected for construction of the foundation perimeter’s single-sided walls and building’s core walls.
Available in the following language(s): Spanish