【作者】 罗白云；

【导师】 熊光晶； 李庚英；

【作者基本信息】 汕头大学 ， 结构工程， 2003， 硕士

【摘要】 为大幅度提高新老混凝土修补界面层的强度和耐久性，本文首次提出并实现两个设想：(1)以国产减缩剂为外加剂，配制新型改性水泥砂浆界面剂。该界面剂既能减少界面层宏观干缩裂缝，又不增加大晶体，使界面层形成密实的微细观结构，显著提高粘结界面层内晶体间的范德华力。(2)借鉴复合材料科学技术，以偶联剂涂抹老混凝土界面，使老混凝土与修补材料产生化学力。本文选用国产减缩剂NA-SP和国产硅烷偶联剂KH-570进行了大量的对比试验研究。研究结果表明，两个设想均能有效地改善新老混凝土粘结界面层的宏观与微细观结构，使力学性能显著提高。本研究克服了以往的界面剂仅能改善界面层宏观或微细观结构的缺点，突破了新老混凝土粘结层主要依靠范德华力提供界面粘结力而几乎不存在化学键作用的缺点。同时，本文从宏观和微观两方面分析讨论了两种新型界面剂的改善机理，提出了今后研究展望。更多还原

【Abstract】 To significantly improve both strength and durability of repair interfacial layer between old and new concrete, two attempts were firstly put forward in this thesis: (1) A kind of new modified primer would be produced by introducing shrinkage reducing admixture into cement mortar, which may both reduce the shrinkage of the interfacial layer, and lessen the content of large crystal in the repaired interface layer, accordingly, remarkably increase the Van der Waals force of interfacial layer. (2) By virtue of the coupling agent technology in complex materials science, chemical force between repair material and old concrete was produced by means of applying coupling agent to coat old concrete. Homemade shrinkage reducing agent NA-SP and homemade silane coupling agent KH-570 were chosen for a large experimental research. The test results showed that two methods effectively improved both macrostructure and microstructure of interfacial layer, and therefore, significantly improved bond performance. The research overcomes the shortcomings of primers in common use, and breaks through the traditional astriction of absence of chemical bond between new and old concrete. Both macrostructure and microstructure as well as bond mechanism was discussed and some further research advice was put forward.更多还原