• 콘크리트학회논문집
• /
• 제24권2호
• /
• pp.103-109
• /
• 2012

프리캐스트 콘크리트 패널에서의 0.1 mm 이하의 미세균열은 구조적 문제점은 없으나, 미관은 물론 장기적으로 내구성을 저하시키는 요인이 될 수 있으므로, 이의 보수를 위한 추가비용이 발생할 수 있다. 이 논문에서는 이러한 미세균열의 발생을 개선하고자 폴리머 시멘트 콘크리트를 적용하여 휨인장강도를 증진시킴으로써 초기 균열하중을 증대시킴으로써, 초기 시공하중에 의한 미세균열 발생을 최소화 하였다. 그 결과 폴리머-시멘트비 5%를 적용하였을 경우의 균열저항모멘트가 증가함에 따라 초기 시공하중에 의한 균열 발생을 제어할 수 있었다.

• 콘크리트학회논문집
• /
• 제13권4호
• /
• pp.406-413
• /
• 2001

본 연구는 기존 원심력 철근콘크리트관의 성능을 향상시킬 수 있는 방법으로 관체 표면을 일정한 두께로 방식 라이닝 모르타르로 처리함으로써 보다 더 내구적인 하수관을 개발하기 위하여 실시하였다. 이를 위해 원심력 철근콘크리트관 제작 시, 동시성형이 가능하고 촉진 증기양생 조건에서도 균열이 발생되지 않는 접착강도가 큰 폴리머 시멘트 모르타르를 제조하였다. 폴리머 시멘트 모르타르를 원심력 철근콘크리트관용 라이닝 재료로 사용하기 위한 기초적 실험결과, 보통 시멘트 모르타르에 비해 역학적 성질 및 내구성이 우수하였으며, 현장적용결과, 동시성형 및 양생조건에 따라 적용될 수 있는 방법은 다양하나, 폴리머의 종류에 관계없이 폴리머 시멘트비를 20% 이하로 하며, 양생온도는 8$0^{\circ}C$이하의 양생조건을 제안할 수 있었다. 또한 현장조건이 가능하면, 2일간 기중양생(2$0^{\circ}C$)을 실시하여 폴리머 시멘트 모르타르 속의 폴리머 필름이 형성된 후, 8$0^{\circ}C$에서 양생시키는 방법이 이상적인 것으로 나타났다.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2004년도 춘계 학술발표회 제16권1호
• /
• pp.180-183
• /
• 2004

In general, the polymer is mainly used with the cement mortar with various admixtures for concrete repair. The properties of cement-polymer mortar was studied by the cement-polymer ratio only and ignored any influence of admixtures in the mortar. Therefore in this study, the test is carried out with 2 product of polymers(the same type produced by different companies) and various admixtures. It is found that the same type of polymers produced by different companies affect the properties of fresh and hardened concrete. As increasing the polymer proportion in mortar, the compressive strength and flexural strength are increased, and also drying shrinkages is increased.

• 한국농공학회논문집
• /
• 제47권6호
• /
• pp.27-34
• /
• 2005

The purpose of this study is to improve the durability performance of polymer modified cement composites for repair of concrete under combined aging conditions. The experimental procedure was divided into three parts. First, the replacement level of mineral admixtures in polymer modified cement composites were determined in an experimental study based on a Box Behnken design. Second, the flow value, compressive strength and chloride permeability test of sixteen types of mixtures were conducted. Test results show that the polymer modified cement composites were effected on the improvement of the compressive strength and permeability performance. Third, the effects on the replacement level of silica fume mixture was evaluated by the compressive strength, chloride permeability, chemical resistance and repeated freezing and thawing cycles test. They demonstrated that the polymer modified cement composites using mixture of silica fume, fly ash, and blast furnace slag improved the durability performance.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
• /
• pp.3172-3179
• /
• 2011

Several materials using polymer-portland-cement concrete have developed to have not only strength of attachment with body, but also waterproof function and strong anti-sodium chloride properties. Especially, in case of railway, unlike other public transportation, it is very difficult to doing the repair and reinforcement work of structure during service time. Therefore, the development and study of materials having characteristics of structural strength, unification behavior with body, and resistance of crack are very important. Accordingly, the characteristic of material of polymer based concrete is indicated compared with the experiment and analysis through this study, and suggested application to railway tunnel, bridge, and concrete track structure.

• 콘크리트학회논문집
• /
• 제17권5호
• /
• pp.703-708
• /
• 2005

본 연구에서는 에틸렌 초산 비닐 (EVA) 재유화형 분말수지를 혼입한 고유동 폴리머 시멘트 모르타르의 응결 시간 수밀성, 염화물이온 침투에 대한 저항성, 동결융해 저항성 및 중성화 깊이에 미치는 분말소포제 첨가율 및 폴리머-시멘트비의 영향에 대하여 검토하였다. 그 결과, 재유화형 분말수지를 혼입한 고유동 폴리머 시멘트 모르타르의 응결 시간은 분말소포제 첨가율에 관계없이 폴리머-시멘트비의 증가에 따라 지연되는 경향을 보였다. 또한 재유화형 분말수지를 혼입한 고유동 폴리머 시멘트 모르타르의 수밀성, 염화물 이온 침투 깊이 및 중성화 깊이는 분말소포제 첨가율에 관계없이 폴리머-시멘트비의 증가에 따라 감소하는 경향을 보였다. 재유화형 분말수지를 혼입한 고유동 폴리머 시멘트 모르타르의 동결융해 저항성의 개선은 재유화형 분말수지의 혼입에 의해 시멘트 수화물과 골재간의 접착성이 개선되기 때문이라 판단된다.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 1995년도 봄 학술발표회 논문집
• /
• pp.225-230
• /
• 1995

Concrete structures need repair and rehabilitation due to functional deficiencies such as cracks, scaling and spalling. Loss of section such as spalling is caused by corrosion of reinforcing bar, fire, temperature change, poor design and etc. This study aims to examine the characteristics of polymer(epoxy)and polymer-cement(latex) for repair materials and to provide the proper repair scheme through static and fatigue tests. Totally 12 beams were tested. Results from static and fatigue tests of beams repaired with polymer and polymer-cement were compared.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 1992년도 봄 학술발표회 논문집
• /
• pp.67-73
• /
• 1992

Polymer-Impregnated Concrete(PIC) is a new polymer-concrete composite material which consist of basic cement concrete and polymer. The mechanical properties and behavior of PIC depend on the type of polymers and the impregnation techniques. In general, the polymer impregnation can improve the strength, durability and ductility of normal concrete. The objective of this study is to develop the analytical procedure for analyzing the structural responces of polymer-impregnated concrete beams with different polymer loading by using finite element method on the basis of experimental results.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 1995년도 봄 학술발표회 논문집
• /
• pp.212-218
• /
• 1995

This study experimentally evaluated the performance of damaged section which was repaired using polymer materials in reinforced flexural flexural members Six different materials, two types of polymer, two types of polymer-cement and two types of cement, were used by means of injection method on prepacked concrete and spray mortar patching method. As results, the repair works could be done easily and surfaces of the repaired section were smooth.

• 한국건축시공학회지
• /
• 제3권4호
• /
• pp.103-109
• /
• 2003

Reinforced concrete structures under sever conditions such as marine structures, bridges and structural constructed with aggregated(dredged front sea). can be deteriorated from corrosion of the reinforcing bars. The purpose of this study is to evaluate the corrosion reflectance of coated steel using polymer dispersion and polymer cement slurry. Polymer dispersion and polymer cement slurry with various polymer types were coated to the surface of bars and steel plate, and tested for accelerated corrosion tests. Tests include adhesion in tension, bending test, chloride ion spray, penetration of NaCl 10％ solution and carbonation. From the test results, the corrosive resistance of steel is considerably improved by using polymer dispersion and polymer cement flurry at surface of steel. The difference of the corrosive resistance is hardly recognized according to types of polymer dispersion. The coated steel using polymer dispersion and polymer foment slurry will be improved to a great extent compared to those of plain steel when increasing content of chloride ion in cement concrete.