By ACI

ISBN-10: 0870314610

ISBN-13: 9780870314612

This file summarizes at the moment on hand information regarding excessive power concrete (HSC). subject matters mentioned comprise collection of fabrics, concrete combination proportions, ordering, batching, blending, transporting, putting, quality controls, concrete houses, structural layout, financial concerns, and functions.

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Extra resources for ACI 363R-10 - Report on High-Strength Concrete

Example text

Similarly, only steel reinforcement is considered, although research is currently being performed on the use of other types of reinforcement, such as fiber-reinforced polymers, in conjunction with HSC. 2—Concentrically loaded columns Because the strength of columns is generally controlled by the compressive strength of concrete, there are significant advantages to using HSC in columns, especially those that carry axial loads alone. Significant research has been completed that focuses on various aspects of structural behavior for HSC columns.

Higher occurrences of explosive spalling of specimens were also observed above 572°F (300°C) by Phan and Carino (2000). Kodur (2000) also studied the spalling characteristics of HSC subjected to fire and reported that spalling is not only influenced by concrete strength, but also concrete density, aggregate type, load intensity, reinforcement configuration, and layout. Kodur reported that the addition of synthetic HIGH-STRENGTH CONCRETE 363R-35 fibers could improve HSC’s resistance to spalling, although it is unclear how synthetic fibers would affect the residual mechanical properties of the concrete after exposure to fire.

It should be noted that experimental research has also shown that HSC columns are more susceptible to premature spalling of the concrete cover. The early spalling of cover concrete in HSC columns is attributed to differences in the rate of drying shrinkage between the cover concrete and the inner core (Collins et al. 1993). This differential shrinkage causes tensile stresses to be developed in the cover concrete. These tensile stresses, in combination with the presence of a plane of weakness caused by the reinforcement, lead to a cracking pattern that may result in spalling of the concrete cover.

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