본 연구에서는 스티렌(styrene; St)과 부틸아크릴레이트(butyl acrylate; BA)를 단량체 비에 따라 합성 제조하고, 합성제조된 시멘트 혼화용 폴리머를 혼입한 폴리머 시멘트 모르타르의 물리적 성질과 내구성에 대한 특성을 보통 시멘트 모르타르와 기존에 생산되어 현장에 적용되고 있는 St/BA계 폴리머 시멘트 모르타르를 비교 분석하고자 하였다. 실험결과, St/BA의 단량체 비가 50:50, 60:40일 경우에는 시멘트 혼화용으로 사용하기에 가장 적합하였으며, 강도특성에서도 우수한 결과를 나타냈다. 또한, 방수성능과 염화물 이온에 대한 침투 저항성, 그리고 중성화 저항성도 St/BA의 단량체 비가 증가할수록, 폴리머 시멘트 비가 증가할수록 증진효과가 우수한 결과를 나타냈다. 따라서, 본 연구를 통해 합성제조된 St/BA 라텍스를 시멘트 모르타르에 혼입할 경우 우수한 성능개선 효과를 얻을 수 있었다.
본 연구에서는 스티렌(styrene; St)과 부틸아크릴레이트(butyl acrylate; BA)를 단량체 비에 따라 합성 제조하고, 합성제조된 시멘트 혼화용 폴리머를 혼입한 폴리머 시멘트 모르타르의 물리적 성질과 내구성에 대한 특성을 보통 시멘트 모르타르와 기존에 생산되어 현장에 적용되고 있는 St/BA계 폴리머 시멘트 모르타르를 비교 분석하고자 하였다. 실험결과, St/BA의 단량체 비가 50:50, 60:40일 경우에는 시멘트 혼화용으로 사용하기에 가장 적합하였으며, 강도특성에서도 우수한 결과를 나타냈다. 또한, 방수성능과 염화물 이온에 대한 침투 저항성, 그리고 중성화 저항성도 St/BA의 단량체 비가 증가할수록, 폴리머 시멘트 비가 증가할수록 증진효과가 우수한 결과를 나타냈다. 따라서, 본 연구를 통해 합성제조된 St/BA 라텍스를 시멘트 모르타르에 혼입할 경우 우수한 성능개선 효과를 얻을 수 있었다.
The effects of the monomer ratios on the typical properties of polymer modified mortars that contain styrene and butyl acrylate latexes was investigated. Basic data was also obtained that is necessary for the development of appropriate latexes for cement modifiers. Polymer modified mortars that cont...
The effects of the monomer ratios on the typical properties of polymer modified mortars that contain styrene and butyl acrylate latexes was investigated. Basic data was also obtained that is necessary for the development of appropriate latexes for cement modifiers. Polymer modified mortars that contain styrene and butyl acrylate latexes polymerized with various monomer ratios were prepared for different polymer-cement ratios. They were then tested to obtain the particle size of the polymer latexes, air contents, water-cement ratios, flexural and compressive strengths, water absorption, and chloride-ion penetration. From the test results, the polymer modified mortars that have styrene and butyl acrylate latexes (with the mix proportions of synthesis having monomer ratios of between 40:60 to 60:40 for the appropriate mix proportions) could be recommended for practical applications. The basic properties of the polymer modified mortars were more affected by the polymer-cement ratio than by the monomer ratio, and were improved over unmodified mortar.
The effects of the monomer ratios on the typical properties of polymer modified mortars that contain styrene and butyl acrylate latexes was investigated. Basic data was also obtained that is necessary for the development of appropriate latexes for cement modifiers. Polymer modified mortars that contain styrene and butyl acrylate latexes polymerized with various monomer ratios were prepared for different polymer-cement ratios. They were then tested to obtain the particle size of the polymer latexes, air contents, water-cement ratios, flexural and compressive strengths, water absorption, and chloride-ion penetration. From the test results, the polymer modified mortars that have styrene and butyl acrylate latexes (with the mix proportions of synthesis having monomer ratios of between 40:60 to 60:40 for the appropriate mix proportions) could be recommended for practical applications. The basic properties of the polymer modified mortars were more affected by the polymer-cement ratio than by the monomer ratio, and were improved over unmodified mortar.
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문제 정의
4, 5 The purpose of this study is to investigate the effects of these various synthetic conditions, such as the types of monomer [St/BA; styrene—butyl acrylate], and the monomer ratios, on the properties of polymer modified mortars. The aim of the st”dy is also to obtain basic data necessary to develop appropriate polymers for cement modifiers.
가설 설정
1) The water-cement ratio of polymer modified mortars that contain St/BA latexes is markedly reduced with an increase in th연 polymer-cement ratio. This implies that an improved consistency is obtained from the ball bearing action between polymer particles and entrained air and from the dispersing effect of surfactants in the latexes.
제안 방법
In this paper, the polymer modified mortars that have St/BA latexes and are polymerized with various monomer ratios are prepared with various polymer-cement ratios, and tested for air contents, strengths, water absorption, chloride-ion penetration, and carbonation of St/BA-modified mortar. From the test results, the effects of monomer ratios and polymer- cement ratios on the properties of polymer modified mortars are discussed.
Table 2 and Table 3 represents th운 chemical and physical properties of ordinary portland cement and Table 4 represent the properties of fine aggregate. The mortar mix proportions used in this investigation are as follows: a cement-sand ratio of 1 : 3 (by weight): and polymer-cement ratios of 0, 5f 10, 15, and 20% (calculated on the basis of the total solids of emulsions). The degrees of flow for the mortars were maintained within 170±5 mm by controlling the water-cement ratio.
대상 데이터
St/BA~modified mortars represent a considerably large air content than the unmodified mortar because of air entrainment. In this study, the air content of the St/BA-modified mortars ranges from 5.4 to 14.6%.
Siliceous sand (sizes: 0.25-0.6 mm), as specified in KS-L5100, was prepared as fine aggregate. Table 2 and Table 3 represents th운 chemical and physical properties of ordinary portland cement and Table 4 represent the properties of fine aggregate.
성능/효과
2) In general, the polymer modified mortars that contain St/BA latexes show a considerably large air content compared to unmodified mortar because of air entrainment The air content of the polymer modified mortars that have St/BA latexes is in the range of 6.8 to 14, 6%.
3) The flexural and compressive strengths of polymer modified mortars that have St/BA latexes are generally improved over that of unmodified mortar, and increased when the styrene content was raised.
4) The water absorption, chloride ion penetration and carbonation of polymer modified mortars that contain St/BA latexes is less than that of unmodified mortar, and tends to decrease consistently when styrene contents are increased. However, the resistance presents a greater difference when the polymer-cement ratio is increased than when the monomer ratio is increased.
참고문헌 (7)
W. Hyung, K. Mun, and W. Kim, J. Appl. Polym. Sci., 103, 3010 (2007)
Beeldens Anne, Influence of Polymer Modification on the Behaviour of Concrete under Severe Conditions, Katholieke Universiteit Leuven, Belgium, p 54 (2002)
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