2011 年 60 巻 9 号 p. 825-830
This study was conducted to grasp the possibilities of a method for determining alkali-aggregate reaction rapidly, through the use of potential difference between two aqueous solutions separated by a cation exchange membrane. The rhyolite powder (75∼150μm) was used in the test samples. The membrane potential according to the equation for theory (Goldman equation) was calculated by substitution of the analysis value of Na, K and Si concentrations at aqueous electrolyte solutions.
The results obtained were as follows : (1) The potential difference was measured with “Positive (+)” and “Negative (-)” values at testing periods of 3∼15minutes, by the use of “Innocuous” and “Deleterious” powder interpreted according to ASR chemical method (JIS A 1145), respectively. (2) The potential difference was highly correlated with Rc/Sc ratio tested to ASR chemical method. (3) The membrane potential according to the theory equation was calculated for “Positive (+)” and “Negative (-)” value, respectively, as in the case of the potential difference by the membrane. (4) From these results, it was recognized that the method of test for alkali-aggregate reaction by electrochemical technique was able to judge rapidly, and held great promise at the site of mine.