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Title |
Mechanical Properties of Repair Mortar Incorporated with Bio Polymer
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Authors |
이선목(Sun-Mok Lee) ; 현정환(Jung-hwan Hyun) ; 권기성(Ki-Seong Kwon) ; 김윤용(Yun-Yong Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2018.22.6.097 |
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Keywords |
보수용 모르타르 ; 초속경 시멘트 ; 합성 폴리머 ; 바이오 폴리머 ; 괭생이 모자반 Repair mortar ; Ultra rapid hardening cement ; Synthetic polymer ; Bio polymer ; Sargassum honeri |
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Abstract |
In recent years, more than 5,000 tons of sargassum honeri have been infested in the southern coast and the coast of Jeju Island, causing serious damage to the farms and fisheries, and environmental problems. The alginate contained in the sargassum honeri is a natural polymeric substance mainly used for medicines and foods. However, since there is no way to utilize it in large quantities, a study was carried out to utilize bio polymer obtained from sargassum honeri in producing polymer mortar for repairing deteriorated infrastructures. From the tests of setting time, it was found that the L0BP12 mixture containing 12% of bio polymer increased the setting time by 20% as compared with the L12BP0 mixture using only synthetic polymer. From the tests of water absorbtion, the LOBP12 combination decreased by 0.36% compared to Plain-URHC using ultra rapid hardening cement. This indicated that the watertightness of the mortar was increased by the incorporation of the bio polymer. In the compressive and flexural strength tests, the strength decreased as the amount of bio polymer increased. The incorporation rate of the maximum bio polymer satisfying the KS F 4042 standard was determined to be 12%. In addition, the bond strength of the mortar produced with biopolymer was higher than that of Plain-URHC specimens, and it was confirmed that incorporation of bio polymer improves bond strength of mortar.
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