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적산온도법에 의한 에폭시 모르터의 초기강도 예측에 관한 연구
연규석,大濱嘉彦,이윤수,김철영 강원대학교 부설 석재복합신소재 제품연구센터 1999 석재연 논문집 Vol.4 No.-
에폭시 모르터를 보수용으로 사용할 경우 거푸집의 회전율을 높이고 완전한 시공관리 차원에서 초기강도의 예측은 매우 중요하다 할 수 있다. 이에 본 연구는 결합재로서 에폭시 수지를 사용한 폴리머 모르터를 제조하고 경화제의 첨가량에 따른 초기강도의 변화를 시멘트 콘크리트에 적용되어 온 적산온도 방법에 의해 예측하는데 목적이 있다. 에폭시 모르터 제조에 사용된 재료는 반응성 희석제로 변성한 저점도형 Bisphenol-A계 액상 에폭시를 사용하였으며, 경화제는 지방족 Amine 변성 경화제를 사용하였다. 실험결과 에폭시 모르터의 기준온도는 -3∼-11℃로 나타났고, 경화제 첨가량에 따른 적산온도와 압축강도 사이의 강도 추정식은 다음과 같이 구할 수 있었다. 30% : Y = 292.42 Ln(M) - 881.16 40% : Y = 386.64 LN(M) - 1223.1 50% : Y = 273.18 LN(M) - 1040.5 Epoxy mortar is widely used to repair cement concrete structure and predicting strength of the mortar is of importance in its application. The objectives of this study were to compare the development of compressive strength of epoxy mortar with respect to maturity and to propose a predictive model for strength development of epoxy mortar. A series of tests were carried out for the hardener contents of 30, 40 and 50 percentage of resin and compressive strengths were measured at the age of 6, 12, 24, 72, 120 and 168 hours respectively under the cure temperature of 0, 10, 20 and 30℃. The datum temperature was estimated by measured strength, and the maturity was calculated with the estimated datum temperature. It was shown that the compressive strength of epoxy mortar could be predicted by regression analysis from the maturity-compressive strength relationship.
Bhutta, M. Aamer Rafique,Tsuruta, Ken,Ohama, Yoshihiko Korea Concrete Institute 2008 International Journal of Concrete Structures and M Vol.2 No.1
This experimental study examines the applicability of polymer mortar permanent forms using a methyl methacrylate (MMA) solution of waste expanded polystyrene (EPS) to develop effective recycling processes for the EPS, referring to the flexural behavior of a polymer-impregnated mortar permanent form with almost the same performance as commercial products. An MMA solution of EPS is prepared by dissolving EPS in MMA, and unreinforced and steel fiber-reinforced polymer mortars are mixed using the EPS-MMA-based solution as a liquid resin or binder. Polymer mortar permanent forms (PMPFs) using the EPS-MMA-based polymer mortars without and with steel fiber and crimped wire cloth reinforcements and steel fiber-reinforced polymer-impregnated mortar permanent form (PIMPF) are prepared on trial, and tested for flexural behavior under four-point (third-point) loading. The EPS-MMAbased PMPFs are more ductile than the PIMPF, and have a high load-bearing capacity. Consequently, they can replace PIMPF in practical applications.
황의환,황택성,대빈가언 ( Eui Hwan Hwang,Taek Sung Hwang,Yoshihiko Ohama ) 한국공업화학회 1994 공업화학 Vol.5 No.5
폴리머-시멘트 모르타르의 강도와 내구성에 대하여 검토하였다. 폴리머-혼화제로서 styrene-butadiene rubber(SBR) 라텍스, ethylene-vinyl acetate(EVA) 에멀젼 및 polyacrylic ester(PAE) 에멀젼을 사용하고, 폴리머-시멘트비를 다양하게 변화시켜(5, 10, 15, 20 wt%) 공시체를 제작하였다. 내구성의 평가시험으로는 동결융해시험, 내산성시험 및 내열성 시험을 수행하였다. 폴리머-시멘트 모르타르의 내동해성은 폴리머-시멘트비가 증가될수록 현저히 향상되었으나 내산성과 내열성은 저하되었다. SBR 폴리머-시멘트 모르타르의 강도(압축 및 휨강도)는 폴리머-시멘트비가 증가될수록 향상되었으나 EVA 및 PAE 폴리머-시멘트 모르타르는 폴리머-시멘트비 10wt%에서 최대치를 나타내었다. The strength and durability of polymer-cement mortars were investigated. The specimens of polymer-cement mortar were prepared by using styrene-butadiene rubber(SBR) latex, ethylene-vinyl acetate(EVA) emulsion and polyacrylic ester(PAE) emulsion with various polymer-cement ratios(5, 10, 15, 20wt%). For the evaluation of durability of polymer-cement mortars, freezing-thawing, acid resistance and heat resistance tests were conducted. With an increase of polymer-cement ratio, the frost resistance of polymer-cement mortars was greatly improved, but acid and heat resistance were deteriorated. The compressive and flexural strengths of SBR polymer-cement mortars were improved with an increase of polymer-cement ratio, whereas those of EVA and PAE polymer-cement mortars reached maximum value at polymer-cement ratio of 10wt%.