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This month’s Q&A focuses on issues related to meeting in-place concrete strength requirements for removing forms for reinforced concrete slabs. It explains how the contractor might accelerate the construction schedule by implementing concrete mixtures with compressive strengths exceeding those specified for the project.
Available in the following language(s): Spanish
To reduce costs and minimize construction schedules for the recent light rail extension in the Phoenix, AZ, USA metropolitan area, track slabs and platform plinths were constructed using fiber-reinforced concrete instead of traditional steel-reinforced concrete. For every concrete placement, the use of fiber-reinforced concrete is estimated to have saved at least 1 to 2 days of labor.
Available in the following language(s): Spanish
Bleeding and finishing issues can result in an increased risk of concrete scaling. This risk may be further increased when supplementary cementitious materials and Type IL cement are used. This article focuses on petrographic examination of scaled flatwork constructed of concrete containing Type IL cement and fly ash, and Type IL cement and slag cement.
Available in the following language(s): Spanish
Precompression is included in service stress analyses of post-tensioned (PT) members but is ignored in flexural strength calculations. With the goal of reassuring practicing engineers that restraint cracking should not be a concern with respect to flexural strength, the authors explain why PT flexural members have significantly greater capacity than predicted by typical calculations.
Available in the following language(s): Spanish
An Architecture PhD Student at Eidgenössische Technische Hochschule (ETH) Zürich, Zürich, Switzerland, has developed a lightweight, foldable, and reusable formwork system for vaulted floors. Known as Unfold Form, this system is easy to fabricate, transport, and use.
Available in the following language(s): Spanish