収縮・クリープ２/物性一般１

[1297] 促進炭酸化によるセメント硬化体の収縮および質量変化のメカニズムの検討

益永カレン みどり¹, 伊代田岳史¹ (1.芝浦工業大学)

キーワード：accelerated carbonation、carbonation shrinkage、C-S-H decalcification、GGBS

Dimensional and mass changes induced by accelerated carbonation at 20% CO2 were investigated in pre-conditioned OPC and GGBS blended cement hardened pastes. An abrupt mass increase followed by a slow ongoing mass decrease was observed, and the final mass change was positive for OPC, but negative for the blended pastes, which also exhibited larger shrinkage. The Calcium Carbonate filling effect is counteracted by the C-S-H decalcification shrinkage and the water release upon carbonation, the key mechanisms governing microstructural changes induced by accelerated carbonation.