재유화형 분말 폴리머 혼입률에 따른 콘크리트 단면 복구용 시멘트계 보수재료의 특성
Characteristics of Cement-based Repair Materials for Concrete Recovery according to Redispersible Polymer Powder Mixing Ratio
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
본 연구에서는 콘크리트 단면복구 공법에 가장 많이 사용되는 보수재료인 시멘트계 모르타르에 VAE계 재 유화형 분말 폴리머를 사용하여 혼입률에 따른 압축강도 및 탄성계수, 부착강도 및 휨 인장강도를 측정하여 역학적 특성을 평가하였고, 균열 저항성및 염소이온 침투 저항성을 측정하여 체적 안정성 및 내구성을 평가하였다. 압축강도 및 탄성계수 측정결과, VAE 폴리머의 첨가량이증가할수록 감소하는 경향을 보였고, 부착강도 및 휨강도는 VAE 폴리머의 혼합률이 증가할수록 높아지는 경향을 보였다. 균열 저항성은 폴리머의 혼입률이 증가 할수록 균열 발생 시기가 늦어지는 것으로 나타났는데, 이는 폴리머의 혼입률이 높아질수록 보수재의 인장강도가 향상되고 수축응력이 억제되었기 때문으로 판단된다. 염소이온 침투 저항성 측정 결과 폴리머의 혼입률이 결합재 대비 6% 이상일 경우 염화물 이온 침투 저항성이 "매우 낮음"으로 매우 우수하게 나타났지만, 폴리머의 혼입률이 3% 이하일 경우 "낮음"에 해당하는 결과가 나타났다.
Abstract
In this study, the compressive strength and elastic modulus, adhesion and flexural tensile strength according to the incorporation of redispersible polymer powder into cement-based mortar, which is the most commonly used repair material for concrete section restoration, were examined, and further, the crack resistance and chloride ion penetration resistance were measured to evaluate the volume stability and durability. As a result, the compressive strength and elastic modulus evaluation results showed that the compressive strength and elastic modulus tended to decrease as the amount of VAE polymer added increased. The bond strength and flexural strength showed that tended to increase as the polymer mixing ratio increased. The crack resistance showed that the higher VAE polymer mixing ratio, the more delayed the crack initiation period was. This is believed to be the result of the polymer mixing improving the tensile strength of the repair material and suppressing shrinkage stress. The chloride ion penetration resistance evaluation showed that when the VAE polymer mixing ratio was 6% or higher, the chloride ion penetration resistance was at the "very low" level. However, when the VAE polymer mixing ratio 3% or less was not satisfied “low”.
참고문헌 (11)
- Jeong, Y. S., "Comparative Study of Bridge Maintenance: United States, United Kingdom, Japan, and Korea", Journal of the Korea Institute for Structural Maintenance and Inspection, 25(5), pp.114~126 (2021)
- A Study on the Preparation of Repair and Reinforcement Tips (Planning) for Facilities (Bridge, Tunnel, etc.), "KALIS", Korea Authority of Land & Infrastructure Safety, ~ (2019)
- Manufacturing and construction of polymer concrete composites, "Korea concrete institute", Kiundang, 14~15 (2013)
- Performance Improvement of Concrete Repairs and Crack Repairs, "KECRI", Korea Expressway Corporation Research Institute, ~ (2021)
- Min, G. H., "Proposals for Enhancing Performance of Repair of Deteriorated Concrete Structures", Journal of the Korea Concrete Institute, 33(6), pp.579~587 (2021)
- Lee, I. K., "Revision of Repair Materials Performance Requirement for Concrete Structures", Journal of Civil and Environmental Engineering Research, 43(1), pp.9~20 (2023)
- Lee, I. K., "Quality Criteria Improvement of Concrete Sectional Restoration Work", Korean Society of Civil Engineers, pp.212~213 (2022)
- Yoo, D. Y., "Evaluation of Shrinkage Cracking Characteristics and Degree of Restraint for Ultra-High-Strength Concrete", Journal of the Korea Concrete Institute, 22(5), pp.641~650 (2010)
- Jeong, Y. S., "Comparative Study of Bridge Maintenance: United States, United Kingdom, Japan, and Korea", Journal of the Korea Institute for Structural Maintenance and Inspection, 25(5), pp.114~126 (2021)
- Sustainable Repair Reinforcement Technology for Concrete Structures, Kimundang, "KSMI", Kimundang, 15~18 (2016)
- See, H. T., "Shrinkage Cracking Characteristics of Concrete Using Ring Specimens", ACI Materials Journal, 100(3), pp.239~245 (2003)