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Much of the concrete produced in the United States contains supplementary cementitious materials (SCMs). The degree of reaction (DOR) of SCMs can be calculated using the pozzolanic reactivity test (PRT), which requires the use of both isothermal calorimetry and thermogravimetric analysis of test samples. The article describes how to determine DOR for commercial SCMs using only isothermal calorimetry, making it easier for commercial testing and production laboratories to evaluate SCMs.
Available in the following language(s): Spanish
The article discusses technologies that allow flat-plate floor systems to economically achieve spans in the 45 to 50 ft (13.7 to 15.2 m) range. These technologies include using ASTM A615/A615M Grade 80 steel, concrete mixtures with design strengths of 8000 psi (55 MPa) and higher, voided slab formers, and post-tensioned slabs with tendons banded over the columns in both directions.
Available in the following language(s): Spanish
Q. I’m working on a project that requires my team to place concrete on various substrates prepared by other subcontractors. What should I focus on when accepting these substrates to avoid any unnecessary issues?
Available in the following language(s): Spanish
Smart Safety, an emergency reporting smartphone app, uses geofencing technology to deliver custom emergency notifications and critical information to workers on a jobsite.
Available in the following language(s): Spanish
In this article, the authors discuss the importance of condition evaluation of existing concrete structures as well as issues associated with the design of concrete repairs. Topics include the various stages of concrete repair (condition evaluation, durability planning, design, and specifications), durability of a repair, and the process needed for a successful repair.
Available in the following language(s): Spanish