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09216 Testing of High-Resistivity Concrete

Picture for 09216 Testing of High-Resistivity Concrete
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Product Number: 51300-09216-SG
ISBN: 09216 2009 CP
Author: R. Daudistel, K. Tomosada, J. Tinnea, C. Stoll, R. Tinnea, B. Hassane and K. Kuder
Publication Date: 2009
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The resistivity of concrete is often used in defining the corrosivity of concrete. This measurement is often performed using variations of the Wenner four-pin test method. This paper discusses the application of the State of Florida Test Method FM 5-578, a variation on the traditional Wenner method that was developed to measure soil resistivity in situ. In work performed on a number of latex-modified rapid setting mortars, which incorporated supplemental cementitious materials (SCM), it was noted that changes in mortar resistivity were related to changes in mortar strength. At early stages, portland cement and SCM hydration makes the mortar pore structure less permeable and more resistive. This continued hydration is also reflected in strength gains. It was also noted that changes in concrete resistivity proceeded expansive cracking. Expansive cracking follows several stages that include development of internal stress, breaking of chemical bonds in the cement phase, microcracking, and finally macrocracking. In relatively moist conditions microcracks can provide more open paths for conducting electricity and hence lower the mortar resistivity. Expansive microcracking also leads to a reduction in mortar strength. The relationship between resistivity and strength is complex and also involves moisture content.

Keywords: concrete, corrosion, cracking, resistivity, stray current
The resistivity of concrete is often used in defining the corrosivity of concrete. This measurement is often performed using variations of the Wenner four-pin test method. This paper discusses the application of the State of Florida Test Method FM 5-578, a variation on the traditional Wenner method that was developed to measure soil resistivity in situ. In work performed on a number of latex-modified rapid setting mortars, which incorporated supplemental cementitious materials (SCM), it was noted that changes in mortar resistivity were related to changes in mortar strength. At early stages, portland cement and SCM hydration makes the mortar pore structure less permeable and more resistive. This continued hydration is also reflected in strength gains. It was also noted that changes in concrete resistivity proceeded expansive cracking. Expansive cracking follows several stages that include development of internal stress, breaking of chemical bonds in the cement phase, microcracking, and finally macrocracking. In relatively moist conditions microcracks can provide more open paths for conducting electricity and hence lower the mortar resistivity. Expansive microcracking also leads to a reduction in mortar strength. The relationship between resistivity and strength is complex and also involves moisture content.

Keywords: concrete, corrosion, cracking, resistivity, stray current
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