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http://dx.doi.org/10.5345/JKIBC.2018.18.4.329

Compressive and Adhesive Strengths of Mortars using Re-emulsification Type Polymer and Ultra-Rapid-Hardening Cement  

Lee, Kwang-Il (Department of Architectural Engineering, Kyonggi University Graduate School)
Yoon, Hyun-Sub (Department of Architectural Engineering, Kyonggi University Graduate School)
Yang, Keun-Hyeok (Department of Architectural Engineering, Kyonggi University)
Publication Information
Journal of the Korea Institute of Building Construction / v.18, no.4, 2018 , pp. 329-335 More about this Journal
Abstract
The objective of this study is to develop a mortar mixture with high workability and adhesive strength for section jacketing in seismic strengthening technology of existing concrete structures. To achieve targeted requirements of the mortars (initial flow exceeding 200 mm, compressive strength of 30MPa, and adhesive strength exceeding 1MPa), step-by-step tests were conducted under the variation of the following mixture parameters: water-to-binder ratio, sand-to-binder ratio, polymer-to-binder ratio, dosage of viscosity agent, and content of ultra-rapid-hardening cement. The adhesive strength of the mortars was also estimated with respect to the various surface treatment states of existing concrete. Based on the test results, the mortar mixture with the polymer-to-binder ratio of 10% and the content of ultra-rapid-hardening cement of 5% can be recommended for the section jacketing materials. The recommended mortar mixture satisfied the targeted requirements as follows: initial flow of 220 mm, high-early strength gain, 28-day compressive strength of 35MPa, and adhesive strength exceeding 1.2MPa.
Keywords
high flow; bond strength; repair mortars; polymer; ultra-rapid-hardening cement;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 Ha IS, Lee SG, Kim NR, Lim JY. A proposal of seismic failure probability estimation chart of the korean small and medium sized earthfill dams. Journal of the Korean Geo-Environmental Society. 2017 Mar;18(3):31-8.
2 Kim YI, Jo BH, Hong SH. An experiment on anchorage and usefullness of expanded steel-plate nets of RC beams strengthened by increasing section. Journal of the Architectural Institute of Korea Structure & Construction. 2008 Aug;24(8):65-74.
3 Oh BH, Cho JY, Cha SW. Failure behavior and separation criterion for strengthened concrete members with steel plates. Journal of the Korea Concrete Institute. 2002 Feb;14(1):126-35.   DOI
4 Kim WK. Properties of polymer-modified mortars using a VA/E/MMA terpolymer powder. Journal of the Architectural Institute of Korea Structure & Construction. 2010 Jul;26(7):111-8.
5 Lee CW, Mun KJ, Song H, Kim BC, Choi NW, Soh YS. Evaluation of durability and bond strength of polymer powder modified mortars with accelerators. Proceedings of the Korea Concrete Institute. 2005 Nov 5; Incheon, Korea. Seoul (Korea): Korea Concrete Institute; 2005. p. 559-62.
6 Koo JS, Yoo SY, Kim JM. Engineering character of ultra hardening concrete-polymer composite using CAC and gypsum mixed CAC. Journal of the Korea Institute of Building Construction. 2016 Apr;16(2):97-105.   DOI
7 Bang JW, Lee SM, Kim YY. Mechanical properties and field implementation of floor mortar incorporated with VAE polymer. Journal of the Korea Institute for Structural Maintenance and Inspection. 2017 May;21(3):27-34.
8 Lee BH, Hong CW, Lee JH, Joung WK. Strength development properties of rapid setting latex modified concrete for early stage form removal. Journal of Advanced Mineral Aggregate Composites. 2001 Oct;6:105-16.
9 Korea Concrete Institute. 2012 Concrete Design Code of Korea. Korea: Korea Concrete Institute. 2012.