Surface resistivity test evaluation as an indicator of the chloride permeability of concrete.
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2012-12-01
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATION
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Abstract:Many agencies have adopted the standard tests for electrical
indication of concrete’s ability to resist chloride ion penetration
(AASHTO T 277 and ASTM C1202), commonly known as the rapid
chloride permeability test (RCPT), in their specifications for qualification
and acceptance and as a means of indirectly assessing
the permeability of concrete mixtures. (See references 1–5.)
Nevertheless, the RCPT is labor-intensive and costly and presents
high variability.(3,6,7)
Research studies have shown that the surface resistivity (SR)
test (AASHTO TP 95) is a promising alternative to the RCPT.
(See references
3, 6, 8, and 9.) Recently, some agencies have
shown interest
in replacing the RCPT with the SR test and have
started implementation
efforts.(3,8) However, none of the studies
have included high-volume fly ash (HVFA) mixtures or mixtures
containing
fly ash and fine limestone powder.
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