Surface Layer Strength of Concrete as a Measure of Scale Resistance


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Title: Surface Layer Strength of Concrete as a Measure of Scale Resistance

Author(s): N. Saeki, Y. Fujita, and N. Takada

Publication: Special Publication

Volume: 91


Appears on pages(s): 563-590

Keywords: concrete durability; cracking (fracturing); curing; freeze-thaw durability; scaling; strength; surface defects; thickness.

Date: 2/1/1986

The properties of the surface layer of concrete may be closely related to the causes of scaling and play an important role in the durability of concrete. In order to obtain the mechanical properties of the surface layer, which are affected by the type of cements, curing and atmospheric condition etc., some tests were carried out by using model specimens with penny shaped cracks (penny shaped crack test) or truncated steel core (pull out test). The ratio of the surface layer strength to split tensile strength was found to be approximately proportional to the thickness of the layer. The surface layer strength is influenced by the curing conditions and is related to the degree of scaling and frost damage.