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This is the third of a series of four articles focused on safety of existing structures. It discusses some of the intricacies associated with "reading the structure"--the process of examining the structure, determining the need for focused testing or further evaluation, and then deciding on a path forward.
Available in the following language(s): Spanish
National codes require determining the compressive strength based on tests conducted on standard cylinders or cubes, but these codes do not provide correlations between cube strength and cylinder strength. Experiments have shown that cube-to-cylinder strength ratios are functions of specimen size and concrete strength.
Available in the following language(s): Spanish
Integrating Type IL cement into construction, while environmentally beneficial, introduces a range of technical difficulties. One primary issue is an inability to consistently achieve the desired compressive strength. Nanoparticle-based admixtures can be used to enhance strength development in mixtures with Type IL cement and higher content of supplementary cementitious materials.
Available in the following language(s): Spanish
Placing and finishing of concrete slabs with portland-limestone cement (Type IL cement) may create issues for some contractors, and bleeding rate is a major factor. The article discusses saw cutting, cold weather protection, post-tensioning, and form removal, as well as best practices and strategies to minimize risks during floor slab finishing and early-age, strength-critical construction with Type IL cement.
Available in the following language(s): Spanish
This month’s Q&A provides an explanation on how to determine an effective depth of a section d when multiple layers of reinforcement are distributed through an entire depth of a reinforced concrete beam.
Available in the following language(s): Spanish