Drying effect of polymer-modified cement for patch-repaired mortar on constraint stress
Drying effect of polymer-modified cement for patch-repaired mortar on constraint stress
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DOI：
10.1016/j.conbuildmat.2007.11.003
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发表时间：
2009
影响因子：
7.4
通讯作者：
Dong-Cheon Park;Jaecheol Ahn;Sang-gyun Oh;H. Song;T. Noguchi
中科院分区：
文献类型：
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作者：
Dong-Cheon Park;Jaecheol Ahn;Sang-gyun Oh;H. Song;T. Noguchi
分析了钢筋混凝土结构修补部位的干缩破坏机理。通过改变聚合物改性水泥砂浆（PCM）的干燥温度和聚合物与水泥的比例，测定了修补材料的水分扩散系数。据发现，PCM的扩散率增加成比例的聚合物水泥比高达10%。通过对修复材料的体积变化、水分扩散系数、含水量和力学性能的耦合线性有限元分析，估算了修复区域因干燥而产生的约束应力。基于相对含水量和应力的分布，讨论了这些参数的影响。干燥收缩产生的应力受基材混凝土、环境条件和PCM材料特性的影响。在测试的修复PCM中，证明聚合物与水泥比为10%的CPM产生最高的约束应力。
Deterioration mechanism due to drying and shrinkage of patch-repaired regions in reinforced concrete structures is analytically investigated. The moisture diffusion coefficient of the repair materials was determined by varying the drying temperature and the polymer-to-cement ratios of the polymer-modified cement mortar (PCM) in the experiment. It is found that the diffusivity of PCM increases in proportion to the polymer-to-cement ratio up to 10%. The constraint stresses due to drying at the repaired region were estimated by the couple-linear finite element analysis with respect to volumetric change, moisture diffusivity, water content and mechanical properties of the repair material. Based on the distributions of relative water contents and stresses, the effects of these parameters are discussed. The stress generated by drying and shrinkage was affected by substrate concrete, environmental condition and the properties of PCM. Of the repaired PCM tested, it is demonstrated that the CPM with 10% polymer-to-cement ratio generates the highest constraint stress.