【作者】 李文婷；

【导师】 陈剑雄；

【作者基本信息】 重庆大学 ， 材料学， 2007， 硕士

【摘要】 修补、加固已成为当今建筑行业的一个重要领域。由于建筑物受损原因和修补环境的复杂性使修补材料的性能不可一概而论。因此,开发不同性能的修补材料以适应不同的修补情况具有重要意义。基于“性能相容性”及“修补的系统设计”等概念,本研究将无机类和有机类修补材料的性能特点相结合,这既使得修补材料有较高的粘结强度,又因为有机成分所占比重相对较小,因而保证了修补材料与基材性能的相容性。本工作采用了超塑化剂和矿物掺合料的“双掺”的技术,以磨细矿渣为主要矿物掺合料,复合掺入了锂渣、石灰石粉等,并针对材料的性能以适当的外加剂(激发剂、乳胶粉、膨胀剂等)改性。通过运用通用的工艺手段和标准养护方式,研究了不同矿物掺合料的复合效应和复合掺合料、外加剂等对修补砂浆工作性能、力学性能及耐久性等的影响。在实验室条件下制备了两种具有不同性能的修补砂浆,可用于对流动性要求较高的修补环境,如钢筋密集区、薄壁构件、复杂型体以及水平地面的修补。且EJ-1修补砂浆还可用于对抗折强度要求相对较高的桥面、路面的修补。EJ-2可用于对早期抗压强度要求相对低的修补环境。以粘结抗剪强度作为新老材料粘结性能的评定指标,配制了四种界面剂。两种修补砂浆均适于分别掺锂渣和膨胀剂的界面剂M2、M3。且界面剂M2的效果优于界面剂M3。扫描电镜和XRD试验表明:以锂渣制备的界面剂M2水化形成的产物呈乱向纤维状,钙矾石细小,有利于界面过渡区的粘结;而以膨胀剂制备的界面剂M3有结晶粗大、择优取向的CH生成,不利于界面粘结。最后研究了矿物掺合料种类、掺量、外加剂等对修补砂浆耐久性能的影响。试验表明,所制得的修补砂浆具有一定的微膨胀性,较好的抗氯离子渗透性和抗硫酸盐腐蚀性。更多还原

【Abstract】 Repair and reinforcement of constructions has been an important field in Construct. It can not be undifferentiated that properties of repair materials considering the complexity of factors resulting deterioration of constructions and environment of repairing. Hence, it has great significance to explore repair materials with different properties in order to adapt to varied repairing situation. Based on the concepts of“compatibility”and“system design in repairing the repairs”, the paper combined the properties of inorganic and organic repair materials, which not only assured the high bond strength of repair materials, but the compatibility of the repair materials and based materials, as the comparing low proportion of organic components.The work exerted“both added”technic of superplasticizer and mineral admixtures, used grinded blast slag as the main admixture, added with lithium slag and limestone etc. and modified the repair materials’properties by some proper agents(accelerating agents, polymer-dispersion additives, expanding agents etc.). By exerting common technics and curing ways, the compound effects of different mineral admixtures and influence of compound admixtures, agents etc. on workability, mechanical properties, durability of the repair mortars had been researched.Two kinds of repair mortars with different properties had been prepared on the condition of lab, which can be self-leveling. So they could be used in the environment of high fluidity required, such as dense steel zone, thin members, complicated form and structures, road surface repairing. Besides EJ-1 can be used in the repair of bridge and road surface which require high flexible strength. EJ-2 can be used in the environment of comparing low compressive strength but good tenacity required.Using bond shearing strength as appraisal index to evaluate the bond properties between new and based materials, four kinds of interfacial agents had been prepared which had different effects on the repair materials. Yet the two kinds of repair materials both are suitable to interfacial agents of M2 and M3 which are added with lithium slag and expansive agents respectively. Interfacial agent M2 is more effective than M3 to the repair mortars .SEM and XRD trials have showed that the hydrate of interfacial agent M2 added with lithium slag admixture appeared shape of disorder fibers, fine AFt, which was beneficial to the bond of interfacial zone(IZ); but interfacial agent M3 added with expansive agent had big crystals, favoring direction CH, which were adverse to the bond of IZ.At last, the influence of sorts, proportion of mineral admixtures and agents on durability of the repair mortars. The trials showed that the repair mortars prepared had been a bit expansive, good resistance of chlorine ion pervision and erosion of sulphate.更多还原