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Title |
Examination of the Characteristics of Mortar Mixed with Boron Compounds Presenting Various Levels of Alkalinity
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Authors |
이빛나(Binna Lee) ; 이종석(Jong-Suk Lee) ; 민지영(Jiyoung Min) ; 이장화(Jang Hwa Lee) |
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DOI |
https://doi.org/10.4334/JKCI.2017.29.1.085 |
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Keywords |
붕소화합물 ; 알칼리도 ; pH 측정 시험 ; 주사전자현미경(SEM) boron compound ; alkalinity ; pH measurement test ; scanning electron microscope (SEM) |
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Abstract |
This study examines the characteristics of mortar mixed with various boron compounds. The adapted boron compounds, classified into acid, slightly alkaline and strongly alkaline with respect to the value of the pH are acid-based boron (AA), low-alkaline-based boron (AB), and high-alkaline-based boron (HB). The pH test, setting test and compressive strength test are performed to evaluate the physical and chemical properties of mortar, and SEM imaging is conducted to analyze the microstructure of mortar. The measured pH shows that the specimens mixed with boron compounds have lower pH than the basic mortar without boron and that loss of pH occurs according to time. The setting test reveals that the initial and final setting times of the specimens mixed with boron compounds occur later than the basic mortar, which disagrees slightly with the previous literature stating that the setting time can be shortened according to the alkalinity. From the compressive strength test and SEM imaging results, it is recommended to determine the optimal content of boron considering type and composition of the boron compounds.
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