Abstract
We have been developed the simple method to measure chloride penetration depth of concrete by using drilling powder and AgNO3 solution. When the drilling powder is combined with the AgNO3 solution, it is necessary that these two things are equal mass to combine. The strong point of this simple method is combination of the AgNO3 solution spray method for measurement chloride penetration depth and the test for neutralization depth with drilling powder（NDIS standard）. In this study, we drilled a hole every 10mm depth in the concrete specimen with blade whose diameter is 20mm. As a result when the drilling powder from the concrete surface to core was combined with AgNO3 solution, two discoloured boundary appeared. One was discolouration from white to light brown（discoloured boundary1）. The other was discolouration from light brown to dark brown（discoloured boundary2）. The discoloured boundary1 was clearer than the discoloured boundary2. Then discoloured boundary1 by combining drilling powder with AgNO3 solution showed 0.6 times compared with the discoloured boundary by spraying AgNO3 to the split concrete surface. This simple method to measure chloride penetration depth of concrete by using the drilling powder and the AgNO3 solution can be utilized to monitor deterioration of concrete structure due to salt attack.
