초음파 펄스 분석을 통한 SBR계 폴리머 혼입 모르타르의 폴리머 혼입률에 따른 진동감쇠비 성능 평가

초록

The mechanical performance and vibration damping ratio performance of a specimen according to thepolymer mixing rate were evaluated for polymer modified mortar. As a polymer, Styrene ButadieneRubber(SBR) liquid polymer with a solid content of about 49~51% was used, and the polymer contentwas increased by liquid 5%. The specimen was 40*40*160(mm), and after curing, compressivestrength, flexural strength, and vibration damping ratio were measured using the ultrasonic pulsemethod. As a result, it was found that the compressive strength decreased as the polymer was mixed,but the flexural strength was increased. The vibration damping ratio increased by 11% at 5% polymer,28% at 10% polymer, 33% at 15% polymer, and 72 at 20% polymer. I was found that the incorporationof the polymer was very effective to reduce the vibration of the mortar. In addition, through SEM andSEM-EDS analysis, it is determined that the cause of vibration reduction due to polymer mixing is thatthe polymer film formed in the transition zone of aggregate and internal voids buffered the vibrationof the mortar inside. Taken together, in the scope of this study, the appropriate polymer mixing ratiofor reducing the vibration of mortar is judged to be about 7.5%.

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