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재유화형 분말수지 출입 폴리머 시멘트 모르타르의 건조수축 및 강도특성
연규석,주명기,이현종,김성기,이지원,Yeon, Kyu-Seok,Joo, Myung-Ki,Lee, Hyun-Jong,Jin, Xing-Qi,Lee, Chi-Won 한국농공학회 2006 한국농공학회논문집 Vol.48 No.1
This study was conducted to investigate experimentally the drying shrinkage and the strength properties of redispersible SBR and PAE powder-modified mortars. Polymer-cement ratio, content of shrinkage-reducing agent and antifoamer content were manipulated as the experimental variables. The peculiarity of this study is to obtain a high early-age strength by using the portland cement and alumina cement with the ratio of 8 : 2. Until 7 days of age, the drying shrinkage remarkably increased up to $1\~2\times10^{-4}$, while it tended to decrease as the ratio of polymer to cement ratio and the content of shrinkage-reducing agent increased. Polymer-cement ratio was effective in improving the flexural, tensile and adhesive strengths: As the ratio increased, the strengths correspondingly increased. The flexural strength was in the range of $7\~11$ MPa, the tensile strength was $3.5\~5$ MPa and the adhesive strength was $1.2\~3.9$ MPa. On the other hand, the compressive strength tended to decrease as the polymer-cement ratio increased, and it was in the range of $23\~39$ MPa. All strengths, flexural, tensile, adhesive and compressive strengths, decreased as the content of powder shrinkage-reducing agent increased. It turned out that the polymer-cement ratio influenced more on the behavior of drying shrinkage and the properties of strength than the powder shrinkage-reducing agent did.
연규석 ( Yeon Kyu-seok ),이현종 ( Lee Hyun-jong ),이재철 ( Yi Jai-chul ),김성기 ( Jin Xing-qi ),최상릉 ( Choi Sang-nung ) 한국농공학회 2006 한국농공학회 학술대회초록집 Vol.2006 No.-
In this study, the polymer mortar was examined experimentally to survey its strength properties, in which MMA using multi-functional admixing agent of PMMA and the reactive additive (RA) for increasing strength and shortening setting time is the main component. Results show that both compressive and flexural strengths show the maximum value when the filler-binder ratio is 1.5. Also both strengths increase as the RA content increases: Those increase 50% when the RA content is 5% and do 80% when the content is 10%. The strengths do not show much variation up to PMMA content of 10%, and rather decrease when the with increasing the content. RA accelerates the hardening to make two-hour-curing strength be 60% and four-hour-curing strength be 90% of 7-day one. Strengths hardly show its difference at above 0℃, but the hardening occurs at the temperature of -10℃ to show 70% of the room-temperature-curing strength. Regardless of RA content, the adhesive strength is about 2.1 MPa when the RA content is over 5%.
연규석 ( Yeon Kyu-seok ),이현종 ( Lee Hyun-jong ),유능환 ( Ryu Neung-hwan ),김성기 ( Jin Xing-qi ),이지원 ( Lee Chi-won ) 한국농공학회 2005 한국농공학회 학술대회초록집 Vol.2005 No.-
Prepacked polymer mortar that is mainly composed of MMA monomer and used for the patching and restoring materials of concrete structures was developed, and its hardening and strength properties were experimentally surveyed. Results of study show that the permeance of binder into the aggregate was excellent for the case of PMMA mixing ratio of below 10%, the surface hardening inferiority was not generated for the case of the ratio of over 5%. Working time of the prepacked polymer mortar and hardening shrinkage tended to decrease as the PMMA mixing ratio increased. On the other hand, the ratio turned out not to decisively affect on compressive and flexural strengths. Regardless of PMMA mixing content, the adhesive strength was about 2.5 MPa. Occurring the desquamation on the substrate of cement concrete showed the adhesive strength of MMA prepact polymer mortar was excellent.