カルシア-ジルコニア系組成物の焼結及び耐水和性

概要

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CaO-ZrO_2 composite was sintered at 1500℃ by addition of ZrO_2 to 20 mol%. ZrO_2 reacted with CaO to form CaZrO_3 that promoted densification of the clinker by restraining growth of CaO grains. The formed CaZrO_3 was mainly located within CaO grains when a small amount of ZrO_2 was doped, while it localized at CaO boundaries with increasing the amount of added ZrO_2. Protective layer, consisting of CaZrO_3 crystalline that encompassed most of CaO grains, formed when the content of ZrO_2 was increased to 20 mol%. The slaking resistance was effectively increased owing to the promotion of densification when a small amount of ZrO_2 was added, and it was increased further by conversion of free CaO into CaZrO_3 with increasing the content of ZrO_2. Especially when a protective layer was formed, the slaking resistance of the clinker increased significantly. The mass gain of CaO clinker without ZrO_2 was 5.8% which decreased to 0.4% by increasing ZrO_2 content to 20 mol% after slaking for 96 h at 70℃ in 90% humidity.
2002-12-01