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Title |
Evaluation of Corrosion Resistance with Grout Type and Tendon
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Authors |
류화성(Ryu, Hwa-Sung) ; 안기홍(An, Ki-Hong) ; 고경택(Koh, Kyung-Taek) ; 권성준(Kwon, Seung-Jun) |
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DOI |
https://doi.org/10.11112/jksmi.2018.22.4.076 |
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Keywords |
그라우트 ; 텐던 ; 부식 ; ICM ; 흡수율 ; 블리딩 Grout ; Tendon ; Corrosion ; ICM ; Absorption ; Bleeding |
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Abstract |
Grout in duct is very effective protection from tendon corrosion in PSC(Prestressed Concrete) structure. In the work, durability and mechanical tests are performed for two types of grout which are conventionally used one and the improved grout with reduced w/c (water to cement) ratio and silica fume. Tendon system with 1000mm height is prepared and various tests including strength, flow, absorption, and bleeding ratio are conducted. ICM(Impressed Current Method) is adopted for corrosion acceleration in tendon with 12.7mm diameter inside grout. For 2 and 4 days, corrosion acceleration is performed for 2 different type of grout and corrosion amount is investigated. The improved grout shows higher compressive strength by 10 MPa and lower absorption ratio by 50% than the conventional one. It also provides an excellent corrosion reduction to 39.8 %∼48.2 % for 2∼4 days of acceleration period.
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