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Title |
A Study on the Strength Property of Recycled Fine Aggregate (Wet Type) Mortar with Blast Furnace Slag
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Keywords |
순환골재 ; 고로슬래그 ; 수화활성도 ; 수산화칼슘 Recycled Aggregate Mortar ; Blast Furnace Slag ; Calcium hydroxide(Ca(OH)2) ; Stimulus |
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Abstract |
This study aims to obtain technical data for improvement of utilization of Blast Furnace Slag(BFS), recycled aggregate in the future by complementing fundamental problems of BFS such as manifestation of initial strength and excessive alkali quantity as well as weakness of recycled fine aggregate through manufacturing of recycled fine aggregate mortar using BFS. The recycled aggregate includes the cement paste hardened as the surface and the type of the aggregate, which contains plenty of calcium hydroxide(Ca(OH)2) as well as the unhydrated cement. Accordingly, the objectives of this study are to inspect the manufacturing the recycled fine aggregate mortar used with blast furnace slag, to consider the effects of the recycled aggregate on the strength development of ground granulated blast furnace slag, and then to acquire the technical data to take into consideration the further usages of the recycled aggregate and blast furnace slag. In eluted ions from recycled aggregate, it showed that there were natrium(Na+) and kalium(K+), expected to be flown out of unhydrated cement, as well as calcium hydroxide(Ca(OH)2). Application of this water to mix cement mortar with ground granulated blast furnace slag was observed to expedite hydration as calcium hydroxide(Ca(OH)2) and unhydrated cement component were expressed to give stimuli effects on ground granulated blast furnace slag. The results of the experiment show that the recycled aggregate mixed with blast furnace slag has comparatively higher hydration activity in 7 day than the mortar not mixed with one in 3 day mortar does, causing the calcium hydroxide in the recycled fine aggregate to work on as a stimulus to the hydration of ground granulated blast furnace slag.
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