電気化学的手法によるアルカリ骨材反応の迅速判定法に関する研究

概要

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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.