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The Concrete Q&A provides an answer for designing a baseplate anchored with rods embedded in a concrete pile cap. To bound a solution for design, two options are considered: a rigid baseplate, with the largest distance from the location of the compression reaction to the critical point, and a flexible baseplate, with the smallest internal lever arm and the largest design axial forces in the anchors.
Available in the following language(s): Spanish
Scotland’s first design museum, the V&A Dundee in Dundee, Scotland, was opened in September 2018. The three-story building is shaped like two inverted pyramids and has exterior walls that twist both horizontally and vertically. The striated façade comprises 2429 precast concrete panels and invokes images of the cliffs of the Scottish coastline. The building is a hybrid structure of concrete and steelwork with reinforced concrete walls and structural steel floor and roof structures.
Available in the following language(s): Spanish
There is a growing worldwide trend of making concrete more environmentally friendly. The article lists notable initiatives taken by some leading professional and manufacturing organizations in relation to developing criteria for characterizing the “greenness” of concrete. Further, the article provides a review of the current status of the concrete industry in India and recent pilot-scale efforts toward evolving and implementing green product certification in this country.
Available in the following language(s): Spanish
Uniformly dispersed, hollow-core polymeric microspheres can protect concrete from freezing-and-thawing damage. However, issues with handling and delivery of this material have prevented its widespread use. The article presents test data that show the effectiveness of a new method of delivering such microspheres into concrete. The method is based on a microsphere-powder blend that minimizes particle agglomeration and eases handling and delivery of the microspheres into concrete mixtures.
Available in the following language(s): Spanish
Q: Last winter, we placed concrete grade beams for an industrial building. A technician from the owner’s testing agency took test cylinders but left them unprotected in the cold weather for a week. At 28 days, the average cylinder compressive strength was 2750 psi. Because this was far below the specified fc′ of 6000 psi, the engineer required three cores to be taken to evaluate the in-place concrete strength. The individual core compressive strengths were 4940, 4970, and 5370 psi, resulting in an average strength of 5090 psi (84.8% of fc′). The engineer rejected the concrete on the basis that the ACI 318-19 Code1 requires the average core strength to equal 85% of the specified strength. In this case, 0.85 fc′ = 5100 psi, so isn’t the average core strength of 5090 psi close enough?
Available in the following language(s): Spanish