骨材の電気化学的性質 : 流動電位

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Although aggregates have been generally classified lithologically, minerallogically, chemically, physically and geometrically, they would be subjected also to a classitication from the viewpoint of physical chemistry. On trying to classify them by the streaming potential, it is found that each kind of aggregates has an individual potential value. Sedimintary rock gives streaming potential of 5 to 100mV, while Igheous rock more than 100mV. Metamorphic rocks are between 37 to 49mV. Minerallogically, quartz, feldspar and limestone give 138mV, 114mV and 24mV, respectively. Chemically, the higher content of solble SiO_2 shows the higher potential and the relation between them is expressed by ST=890SS+401.3 where ST means the streaming potential and solble SiO_2 Content. It is considered that SiO_2 affects the potential to the negative side and CaO+MgO having +2 ion affects it to the positive side, but Fe_2O_3 or Al_2O_3 having +3 ion gives no effect on the potential because of its insolbility to water. In general, the aggregates generate ions on their surface by contacting with water and, at the same time, am irregular ionic distribution occurs in the water, then the streaming potential is to be measured when water is trans-ferred by pressure, so that it is possible to distinguish whether the aggregates react easily with an aqueous solution or not. As an example of an aggregate extremely reactive with aqueous solution can be mentioned alkaline reactive aggregates. The alkaline reactive aggregate is charecterized by the high content of soluble SiO_2, K_2O+Na_2O. Byrex glass consistes many of them and its spotential is very great value.
社団法人日本建築学会の論文
1968-09-30

骨材の電気化学的性質 : 流動電位

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