| 摘要: |
| 聚合物水泥基涂层相较于环氧涂层可更好地维持与钢筋的结合。本文采用丙乳与P·O 52.5水泥，按不同质量比配置聚合物水泥基涂层，通过交联度测试、涂层拉拔试验、抗氯离子渗透试验以及Machu试验探索聚合物与水泥质量比（聚灰比）对涂层工程性能的影响，利用扫描电子显微镜-能谱法(SEM-EDS)分析聚合物与水泥水化产物的交互作用。试验结果表明：聚灰比对涂层工程性能存在较大影响且存在最优值，于22%~27%时各方面性能最佳，过高或过低的聚灰比均会降低生成膜状物的强度与致密性，进而削弱其工程性能。扫描电镜结果表明：丙乳水泥基涂层提升钢筋耐腐蚀性能与工程性能的机制可以归纳为聚合物可以充分交联成膜并逐渐包裹水泥水化产物形成连续膜状物，改善了涂层致密性，从而提高涂层工程性能。 |
| 关键词: 丙乳 水泥基涂层 耐腐蚀性能 工程性能 微观特性 |
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| 基金项目:国家重点研发计划项目 2021YFB2600704，中央级公益性科研院所基本科研业务费专项资金(Y421002），江苏省水利科技项目（HKZJG-KY-01） |
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| Effect of Polymer-Cement Ratio on Properties of Polyacrylate Latex Cement-Base Coatings |
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Zhang Taoran1, Ge Jinyu2, Xiao Huaiqian3, Lin li3, Yue binbin3, Li Huaisen2, He Yang1
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1.Materials structural Engineering Department,Nanjing Hydraulic Research Institute;2.Materials structural Engineering Department,Nanjing Hydraulic Research Institute,Nanjing,Jiangsu,210029;3.Jiangsu Province Huaishu New River Management Office
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| Abstract: |
| The corrosion resistance of steel bars is a key factor affecting the overall durability of reinforced concrete. With polyacrylate latex (PA), oily epoxy resin , waterborne epoxy resin and P·O 52.5 Cement, according to different mass ratios of polymer cement-based coating, through crosslinking degree test, coating pull-out test, chloride ion permeability test and Machu test to explore the influence mechanism of polymer-cement mass ratio (poly-ash ratio) on coating engineering performance, scanning electron microscopy-energy spectroscopy (SEM-EDS) to analyze the interaction mechanism between polymer and cement hydration products. The comparative test show that the polymer-cement ratio has a great influence on the engineering performance of the coating and there is an optimal value, which has the best performance in all aspects at about 22%~27%, and the polymer-cement ratio that is too high or too low will reduce the strength and compactness of the generated film, and further weaken its engineering performance. The scanning electron microscopy show that the mechanism of propylene latex cementitious coating to improve the corrosion resistance and engineering performance of steel bars can be summarized as polymer, which can be fully crosslinked into a film and gradually wrapped the cement hydration product to form a continuous film, which improves the compactness of the coating and thus improves the engineering performance of the coating. |
| Key words: polyacrylate latex cementitious coating corrosion resistance engineering performance microscopic property |
