自養護混凝土之可行性研究

Abstract

良好的養護，必須避免水分由混凝土表面過度的蒸散。養護不良會使得水泥水化不完全而導致混凝土的發展不符合要求。有數種的養護分式可以確保混凝土中有足夠的水分進行水化。然而，這些方式常常因為施工者的疏忽而達不到品管的要求。

本研究係探討“自養護”混凝土的可行性。試驗中擬採用三種養護材料A、B、C使得混凝土在澆置後不需額外的水分或任何外部的養護便能達到理想的養護。養護材料A、B具有涵養水分與吸收空氣中水蒸氣的特性；而材料C則為強力的吸水材料。試驗中藉由量測水分重量損失、試體強度與體積收縮來探討自養護混凝土的可行性。

To achieve good cure, excessive evaporation of water from concrete surface should be prevented. Failure to do this will lead to the degree of cement hydration being lowered and thus unsatisfactory properties. Curing can be performed in a number of ways to ensure that an adequate amount of water is available for cement hydration to occur. However, it is not always possible to cure concrete satisfactorily because of worker’s negligence. This paper studies the feasibility of “self-curing concrete”. Cure of concrete without the need for applying extra water or external curing methods, three materials A、B and C are used. The material A、B’s abilities is to retain water in concrete and to absorb mist from air ; the material C is a super-absorbent material. The feasibility of self-curing concrete was investigated by measuring weight lose、compressive strength and shrinkage.