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Title |
Effects of Triethanol Amine and Triisopropanol Amine on the Compressive Strength and Discoloration of Mortar
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Authors |
방진욱(Jin-Wook Bang) ; 박명주(Myung-Joo Park) ; 이병재(Byung-Jea Lee) ; 김윤용(Yun-Yong Kim) |
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DOI |
https://doi.org/10.4334/JKCI.2018.30.3.241 |
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Keywords |
미분쇄 조제 ; 디에틸렌 글리콜 ; 트리에탄올 아민 ; 프리아소프로판올 아민 ; C4AF grinding aids ; diethylene glycol ; triethanol amine ; triisopropanol amine ; C4AF |
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Abstract |
Grinding aids are mostly organic compounds that are added to the clinker in the cement milling process. Their main purposes are to reduce the energy required to grinding process the clinker into a given blain and therefore increase the efficiency of the cement mill. Grinding aids have been used for more than 50 years and the most common grinding aids are diethylene glycol, triethanol amine, and triisopropanol amine. In addition to increasing the efficiency of the mill, some grinding aids also provide important positive effects on the properties of fresh/hardened cement paste or concrete such as rheology and improved strength development. This current study investigated the effect of diethylene glycol (DEG), triethanol amine (TEA), and triisopropanol amine (TIPA) on the cement properties. In particular, in order to evaluate the effect of DEG, TEA, and TIPA on C4AF, two types of cement were set according to the C4AF content, and mortar compressive strength, Fe ion elution, and discoloration experiments were performed. Through the compressive strength test, the types of grinding aids and C4AF content were found to have different effects on cement strength development. The elution rate of the Fe-complex was evaluated through a Fe ion elution experiment. As the amount of C4AF and chemical formula weight and molecular size of the grinding aids increased, the elusion amount of the Fe-complex also increased and the discoloration of paste due to the oxidation of Fe ions was confirmed under a steam curing condition.
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