Abstract: Aiming at preparing a kind of repair mortar with proper setting time and higher early strength, anhydrous sodium sulfate was microencapsulated and incorporated into the repair mortar. Then the effects of the microcapsules on setting time, compressive strength, development of hydration process, hydration product and the growth rate of ettringite in early hydration of the repair mortar were investigated in depth. The results showed that the setting process of paste was substantially prolonged, the interval of initial and final setting time was shortened, while no obviously variation of compressive strength was found after the anhydrous sodium sulfate microcapsules were incorporated in the repair mortar. Thanks to the addition of the microcapsules, the hydration rate of the paste maintained at a low level in the first 3 h of hydration, then the hydration rate increased obviously, and finally the paste reached the similar hydration degree with the repair mortar adding the same amount of anhydrous sodium sulfate. Besides, the repair mortar with microcapsules exhibited a high growth rate of ettringite in early hydration, and its hydration product could obtain a similar densification with that of the repair mortar adding the same amount of anhydrous sodium sulfate after hydration for 4 h.
杨刘琨, 潘志华, 徐赛赛, 刘劲松. 微胶囊在修补砂浆中延迟释放早强剂的应用及性能分析[J]. 材料导报, 2019, 33(2): 246-250.
YANG Liukun, PAN Zhihua, XU Saisai, LIU Jingsong. Microcapsules for Realizing Delayed Release of Early Strength Agent in Repair Mortar and Their Property Analysis. Materials Reports, 2019, 33(2): 246-250.
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