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Title |
The Effect of the Replacement of Grinded Fly Ash according to Curing Temperature on Repair Mortar Based on Polymer Admixture
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Authors |
심재일(Jae-Il Sim) ; 문주현(Ju-Hyun Mun) ; 윤인구(In-Gu Yun) ; 전용수(Young-Su Jeon) |
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DOI |
http://dx.doi.org/10.11112/jksmi.2015.19.4.116 |
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Keywords |
미분쇄된 플라이애시 ; 보수모르타르 ; 폴리머 ; 역학적 특성 ; 강도발현계수 Grinded fly ash ; Repair mortar ; Polymer ; Mechanical property ; Strength development factor |
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Abstract |
The objective of this study is to evaluate the effects of the replacement levels of grinded fly-ash on the repaired mortar based on a polymer. The main parameters are the curing temperature and replacement levels of grinded fly-ash. The curing temperature and the replacement levels of grinded fly-ash are varied at 40℃, 20℃ and 5℃, and between 0% and 35% of the total binder by weight, respectively. The flow in fresh mortar and compressive strengths according to ages, the relationship of stress-strain, elastic modulus and modulus rupture in hardened mortar, as well as scanning the electron microscopy and the X-ray diffraction of mortar, were measured, respectively. The test results showed that the flow, elastic modulus and modulus rupture are great in mortar specimens with 20~30% of the replacement levels of grinded fly-ash. In addition, compressive strengths according to ages were affected by the replacement levels of grinded fly-ash and the curing temperature indicated that the strength development ratio of mortar with 20% of the replacement levels of grinded fly-ash was greater than others. In the prediction of the compressive strength specified by the ACI 209 code, the strength development at an early and late age can be generalized by the functions of the replacement levels of grinded fly-ash and the curing temperature. In the analysis of scanning the electron microscopy and the X-ray diffraction, the number and intensity of peaks increased and the form of CSH gels on the surface of the particle of grinded fly-ash was observed.
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