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Title |
The Strength Properties Activated Granulated Ground Blast Furnace Slag with Aluminum Potassium Sulfate and Sodium Hydroxide
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Authors |
김태완(Taw-Wan Kim) ; 함형길(Hyung-Gil Hahm) |
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DOI |
http://dx.doi.org/10.4334/JKCI.2015.27.2.095 |
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Keywords |
칼륨명반 ; 수산화나트륨 ; 고로슬래그 미분말 ; 알칼리 활성화 시멘트 aluminum potassium sulfate ; sodium hydroxide ; granulated ground blast furnace slag ; alkali-activated cement |
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Abstract |
In this paper, the effects of sodium hydroxide (NaOH) and aluminum potassium sulfate (AlK(SO4)2?12H2O) dosage on strength properties were investigated. For evaluating the property related to the dosage of alkali activator, sodium hydroxide (NaOH) of 4% (N1 series) and 8% (N2 series) was added to 1~5% (K1~K5) dosage of aluminum potassium sulfate (AlK(SO4)2? 12H2O) and 1% (C1) and 2% (C2) dosage of calcium oxide (CaO). W/B ratio was 0.5 and binder/ fine aggregate ratio was 0.5, respectively. Test result clearly showed that the compressive strength development of alkali-activated slag cement (AASC) mortars were significantly dependent on the dosage of NaOH and AlK (SO4)2?12H2O. The result of XRD analysis indicated that the main hydration product of NaOH + AlK (SO4)2?12H2O activated slag was ettringite and CSH. But at early ages, ettringite and sulfate coated the surface of unhydrated slag grains and inhibited the hydration reaction of slag in high dosage of NaOH + AlK (SO4)2? 12H2O. The SO4 -2 ions from AlK (SO4)2?12H2O reacts with CaO in blast furnace slag or added CaO to form gypsum (CaSO4?2H2O), which reacts with CaO and Al2O3 to from ettringite in NaOH + AlK (SO4)2?12H2O activated slag cement system. Therefore, blast furnace slag can be activated by NaOH + AlK (SO4)2?12H2O.
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