EFFECT OF SUPPLEMENTARY CEMENTING MATERIALS ON THE SPECIFIC CONDUCTIVITY OF PORE SOLUTION AND ITS IMPLICATIONS ON THE RAPID CHLORIDE PERMEABILITY TEST (AASHTO T277 AND ASTM C1202) RESULTS
C. Shi et al., EFFECT OF SUPPLEMENTARY CEMENTING MATERIALS ON THE SPECIFIC CONDUCTIVITY OF PORE SOLUTION AND ITS IMPLICATIONS ON THE RAPID CHLORIDE PERMEABILITY TEST (AASHTO T277 AND ASTM C1202) RESULTS, ACI materials journal, 95(4), 1998, pp. 389-394
Citations number
24
Categorie Soggetti
Construcion & Building Technology","Material Science
AASHTO T277 and ASTM C1202 have specified a rapid test method to rank
the chloride penetration resistance of various concretes by applying a
potential of 60 V DC to a concrete specimen and measuring the charge
passed through the specimen during sh hours of testing. The method is
essentially a measurement of electrical conductivity of concrete, whic
h depends on both the pore structure and the chemistry of the pore sol
ution. Analyses based on published results have indicated that the rep
lacement of portland cement with supplementary cementing materials, su
ch as silica fume, can reduce the electrical conductivity of concrete
more than 90 percent due to the change in pore solution composition in
the concrete. Chemical composition of pore solution has little to do
with the transport of chloride ions in the concrete; thus, it is not c
orrect to use passed charge to rank the chloride penetration resistanc
e of concrete made with supplementary cementing materials.