Keywords : Repair materials
Factors Affecting the Relationship Between Total Porosity and Electrical Resistivity for Concrete Repair Materials
Engineering and Technology Journal,
2008, Volume 26, Issue 8, Pages 1016-1024
The paper examines the properties of five different types of repair and substrate
materials, including conventional mortar, fly ash mortar, silica fume mortar, conventional
concrete substrate, and high-performance concrete substrate materials. Assessment was
carried out on the basis of some physical properties (total porosity, and electrical resistivity).
These properties were measured at early age and later after 14 weeks of exposure conditions
to 6 % (by weight) of sodium chloride solution to simulate typical marine environment.
The results show that the electrical resistivity and total porosity measurements appear
to be related and the measurements obtained are affected by the pore structure of the
materials. It is also expresses that if a material has grater proportion of coarse aggregates (e.g.
the substrate concrete in this study) it will appear to have a lower porosity although the
porosity of mortar surrounding the aggregates could be higher. This makes comparisons
between materials containing different aggregates proportions and size difficult.