• 콘크리트학회지
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• 제8권3호
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• pp.157-165
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• 1996

경화제 무첨가 에폭시 수지는 시멘트 모르터 및 콘크리트 중에 시멘트 수화에 의해 생성된 수산화물(예를 들어 $Ca(OH)_2$)의 존재하에서 경화할 수 있음에 착안하여, 본 연구는 경화제를 첨가하지 않은 에폭시 시멘트 모르터 및 콘크리트의 배합비 변화에 따른 역학적 성질을 파악하고 종래의 경화제 첨가 에폭시 시멘트 모르터 및 콘크리트와 비교하여 성능과 경제적인 면에서 우수한 경화제 무첨가 에폭시 시멘트 모르터 및 콘크리트를 개발하기 위하여 연구되었다. 연구 결과 종래의 경화제 첨가 에폭시 시멘트 모르터 및 콘크리트와 비교하여 10-20%의 낮은 폴리머 시멘트 비에서 우수한 역학적 성질을 가진 경화제 무첨가 에폭시 시멘트 모르터 및 콘크리트를 개발할 수 있다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2009년도 추계 학술논문 발표대회
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• pp.55-59
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• 2009

The epoxy resin without hardener can harden by a ring-opening reaction in the presence of the alkalies produced by the hydration of cement in epoxy-modified mortars and concretes. This paper investigates the effect of curing conditions on the strength improvement of polymer-modified mortars using bisphenol A-type epoxy resin without hardener. The polymer-modified mortars using epoxy resin are prepared with various polymer-cement ratios, and subjected to ideal, water, dry and heat cures. In the heat cure, the epoxy-modified mortars are sealed or unsealed with a PVDC (polyvinylidene chloride) film. The epoxy-modified mortars are tested for flexural and compressive strengths at desired curing methods. The microstructures of the epoxy-modified mortars are also observed by scanning electron microscope. The effects of curing conditions on the strength development of the epoxy-modified mortars are examined. From the test results, the marked effectiveness of the heat cure under the PVDC film sealing against the development of the strength of the epoxy-modified mortar without the hardener is recognized. The flexural and compressive strengths of 7-day-90℃ heat-cured, PVDC film-sealed epoxy-modified mortars without hardener reach 7 to 17MPa and 24 to 44MPa respectively, and are two to three times of Unmodified mortar. Such high strength development of the epoxy-modified mortars may be achieved by the dense microstructure formation by cement hydrates and the hardening of the epoxy resin in the mortars.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2012년도 추계 학술논문 발표대회
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• pp.255-257
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• 2012

Epoxy resin without any hardener can harden in the presence of hydroxide ions in cement mortars and concretes at ambient temperature. The purpose of present study is to examine the hardening properties of hardener-free epoxy-modified mortars by curing conditions. The hardener-free epoxy-modified mortars using diglycidyl ether of A epoxy resin are prepared with various polymer-cement ratios, and subjected to initial moist/dry curing, initial steam(90℃) curing, initial steam/heat(80℃, 100℃) curing.As a result, degree of hardening of epoxy resin in initial moist/dry cured, initial steam cured and initial steam/heat(80℃) cured hardener-free epoxy-modified mortars is decreased with increasing polymer-cement ratio. However, it is markedly improved with additional dry-curing periods. On the other hand, regardless of the polymer-cement ratio and dry curing periods, degree of hardening of hardener-free epoxy-modified mortars with initial steam/heat(100℃) cure is over 95%.