【作者】 千杰；

【导师】 李炜光；

【作者基本信息】 长安大学 ， 交通运输工程， 2011， 硕士

【摘要】 随着我国经济的快速增长,交通与建筑行业取得了前所未有的发展,水泥混凝土材料以其优异的性能及相对低廉的价格被广泛使用。然而,由于我国地质条件复杂,自然灾害频发,灾后抢通抢修工作变得十分重要。实践表明,灾后快速恢复交通,对保护人民生命财产安全和国防建设具有重大的现实意义。基于此,本文参考混凝土相关规范,对超早强修补材料的工作性、力学性和耐久性进行了系统研究；采用DTA和SEM从微观角度分析了超早强修补材料作用机理；通过工程实体应用研究了超早强修补材料施工工艺。本文取得的主要成果如下：系统研究了矿物掺合料与聚合物的种类及掺量等对超早强修补砂浆的影响规律。矿物掺合料的掺入可延长超早强修补砂浆可操作时间,但砂浆的流动性、抗折强度、抗压强度和粘结强度随着矿物掺合料的掺入有所降低；聚合物的掺入可以延长砂浆可操作时间,改善其流动性,提高砂浆的后期粘结强度,但却降低材料的抗折强度、抗压强度和早期粘结强度。矿物掺合料和聚合物的掺入可优化砂浆的内部结构,改善超早强修补砂浆的抗渗性、干缩性能和抗硫酸盐侵蚀性能等耐久性。研究了超早强修补混凝土的工作性、力学性和耐久性,结果表明：超早强修补混凝土具有良好的工作性能；具有早期强度高后期强度不倒缩的力学性能；具有抗渗等级高、抗疲劳性能好、高强耐磨等优异的耐久性能。在延安二十里铺机场等实体工程中得到成功应用,施工现场的跟踪调查表明超早强修补混凝土具有优异的工作性、力学性和耐久性,据此提出了超早强修补材料的施工工艺。微观测试结果显示：超早强修补材料早期生成了大量水化产物,并且随着龄期的增长,云雾状胶凝体增多,使内部结构更为密实,从而表现出早期强度高、后期强度不倒缩和良好的抗渗性、干缩性、抗疲劳性等耐久性能。更多还原

【Abstract】 With the rapid development of the economy, transportation and construction industries achieved unprecedented development, cement and concrete materials are widely used for their superior performance and relatively low price. However, the post-disaster repair work has become very important, because China is located in geological hazard earthquake-prone area, and natural disasters happened increasingly. The practices showed that, recovering traffic with quickest speed after the disaster had great realistic significance in protecting people’s life and property security and constructing national defense. Based on this, the workability, mechanical property and durability of super early strength repairing materials were studied systematically in this article. The paper also researched the mechanism of super early strength repairing materials by DTA and SEM, while studied the construction craft of the super early strength repairing materials through the engineering entity. The main achievements in this article are shown as follows:The influence regularity of the type and dosage of the mineral admixtures and the polymer to the super early strength repair mortar were studied in this article systematically. Mixed with mineral admixture could prolong the operating time of super early strength repairing mortar. However, it would reduce the fluidity, the flexural strength, the compressive strength and the bond strength; Mixed with polymer additive could prolong the operating time and improve fluidity and mortar’later bond strength of super early strength repairing mortar. But at the same time, it would bring down the flexural strength, the compressive strength and the early bond strength. The mineral admixtures and polymer additive could optimize the internal structure of the mortar, and improve its durability such as penetration-proof quality, shrinkage properties and corrosion resistance to sulfate.The results of research on workability, mechanical properties and durability of the super early strength repairing concrete indicated that, it has good workability, high early strength, sustainable late strength development, and high durability such as high anti-permeability rank, good anti-fatigue performance high strength abrasion resisting. The super early strength repairing concrete applied successfully in Yan’ an airport. The follow-up survey of the case study showed that, the super early strength repairing concrete had good workability, mechanical properties and durability, and then a construction process for the super early strength repairing concrete was put forward.The microscopic test results of super early strength repairing materials showed that, there are mass hydration products in the early stage. And nebulous gel increased along with the growth of age, which made the internal structure more close-grained. So the super early strength repairing materials had great early strength, stable post strength and good durability such as penetration-proof quality, dry shrinkage and fatigue resistance.更多还原