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Available in the following language(s): Spanish
Only three sections in Chapter 18—Earthquake-Resistant Structures of ACI 318-19 remain unchanged in comparison to ACI 318-14. This is the second of two articles that outline these changes and is focused on special structural walls, diaphragms and trusses, foundations, and members not designated as part of the seismic force-resisting system.
Available in the following language(s): Spanish
Concrete cracking presents a significant obstacle to achieving a liquid-tight environmental engineering concrete structure. The minimum shrinkage and temperature (S&T) reinforcement requirements cited in ACI 350-20 should prove to be beneficial with respect to limiting crack widths and reducing the likelihood of leakage. However, in some instances, simply increasing the amount of S&T reinforcement alone may not be enough.
Available in the following language(s): Spanish
Cracking in the repair material is one of the most serious causes of premature deterioration and failure of concrete repairs. The article focuses on specific aspects of cracking in concrete repairs comprising hydraulic cements and discusses development of an environmentally friendly, cement-based repair material with reduced brittleness and improved resistance to cracking.
Available in the following language(s): Spanish
Q: One of our customers has asked us to use a portable hydronic heating system to cure a pavement slab with a stamped and exposed aggregate finish. The system hoses would be placed on the concrete in a back-and-forth pattern, with a hose spacing of about 12 in. (300 mm) on-center. We plan on placing the hoses directly on the slab, followed by curing blankets, as soon as practical after we have finished stamping.
We have used portable hydronic heaters to cure plain gray concrete. They have worked well, but we are unsure if we should use one for curing decorative concrete. Will the hoses “shadow” onto the decorative concrete because of differential curing?
Available in the following language(s): Spanish