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This month’s Q&A focuses on training requirements for operators of devices used for floor flatness/levelness testing. It discusses whether “legacy training” is enough, or examination and certification are required. It also reviews ACI documents for provisions and recommendations regarding this topic.
Available in the following language(s): Spanish
Undercut anchors reliably transfer high static and cyclic loads into concrete by a robust mechanical interlock. To evaluate performance of post-installed anchors, the design strength was compared for three types of mechanical anchors (undercut anchor, screw anchor, and expansion anchor) and one adhesive anchor embedded in concrete and the load-displacement performance was compared for an undercut and adhesive anchor.
Available in the following language(s): Spanish
This article is Part 2 of a two-part examination of the design and analysis of curved tunnel linings placed in direct contact with and restrained by the surrounding ground. While Part 1 focused on design considerations and a brief history of tunnel linings, Part 2 provides recommendations for tunnel analysis and proposes changes to ACI capacity calculations
Available in the following language(s): Spanish
From her earliest childhood in Tanzania, Sherryen Mutoka was mesmerized by her father’s construction drawings. An engineer himself, he helped foster her passion for the built environment.
Available in the following language(s): Spanish
Architectural concrete requires a higher aesthetic finish than typical structural cast-in-place work. If structural concrete is expected to meet the aesthetic requirements normally associated with architectural concrete, the more subjective properties must be qualified and bid as architectural requirements. Otherwise, final acceptance of cast-in-place structural concrete might be difficult.
Available in the following language(s): Spanish