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Authors |
신진용 ; 김재영 ; 홍지숙 ; 서정권 ; 노재성 |
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Keywords |
알칼리 알루미네이트 급결제 ; 알카리프리계 급결제 ; 숏크리트 ; 응결 시간 ; 수화 생성물 alkali accelerator ; alkali-free accelerator ; shotcrete ; setting time ; hydrate |
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Abstract |
The influence of liquid shotcrete accelerators(alkali aluminate, two types of alkali-free) was investigated. Comparing to the existing alkali aluminate accelerator, new alkali-free accelerator, AF2, shortened initial and final setting of cement system, and after curing for 1 day compressive strength was analogous with others. On the other hand, compressive strength of specimen cured for 12 hour was the highest by the addition of alkali aluminate accelerator, but final strength was the lowest by that. But compressive strengths of AF1, AF2 were similar to Plain up to 28day. Further from XRD(X-Ray Diffractometer) and DSC(Differential Scanning Calorimeter) analyses, we confirmed that setting promoted by alkali aluminate was mainly because of Ca(OH)2(calcium hydroxide), but the accelerating behavior of alkali-free was influenced by the needle-like ettringite (6CaO·Al₂O₃·3SO₃·32H₂O)crystal.
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