ジルコニア添加によるカルシアの焼結及び耐水和性の改善

概要

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CaO clinker was sintered from CaCO_3 powder (with purity of more than 98%) at 1300-1600℃ by the addition of ZrO_2 to 1% (molar ratio). ZrO_2 reacted with CaO to form CaZrO_3 at all temperatures. The formed CaZrO_3 was mainly located between CaO grains when the sample was sintered at a lower temperature (1300℃), whereas it was mainly located within CaO grains when the sample was sintered at higher temperatures (above 1400℃). The growth of CaO grains was inhibited by the addition of ZrO_2, resulting in poor densification when the sample was sintered at a lower temperature (1300℃). When the sintering temperature was raised, grain growth and densification were promoted and the relative density of the clinker reached a maximum at 1500℃. The slaking test showed a better slaking resistance when the clinker was sintered at 1400-1600℃ by the addition of ZrO_2.
2002-11-01