EFFECT OF DRYING CONDITION AT EARLY AGE ON MICROSTRUCTURE OF HARDENED CEMENT

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  • 若材齢における乾燥がセメント硬化体の内部組織構造に及ぼす影響
  • ジャクザイレイ ニ オケル カンソウ ガ セメント コウカタイ ノ ナイブ ソシキ コウゾウ ニ オヨボス エイキョウ

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Abstract

Curing is very important for its good performance for early age. However, many reports suggest that removal of formwork is too quick for early age. Upon been exposed to the drying conditions, the cement hydration is not able to progress. In this research, the aim is to find out the effect of drying. When cement hydration was temporarily stopped, there were many large pores remaining after drying. On the other hand, when moisture was re-supplied into the specimens after drying, cement hydration was restarted and the remaining large pores became smaller. However, the compressive strength could not be recovered. The reason is that re-supplying of moisture will produce different hydration products and microstructures and also there are some cracks in the specimens.

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