【作者】 张军学；

【导师】 王桂明；

【作者基本信息】 武汉理工大学 ， 材料学， 2012， 硕士

【摘要】 水泥基材料在大范围应用的同时也伴随着自然环境、灾难破坏、人为因素的作用而引起水泥基材料的诸多病害,而开裂问题是这些灾害中最严重的也是急需要解决的问题。传统的解决方案是重新修补,但是这种被动的修复方法已经不能完全满足人们的需求,本文针对的是水泥基材料自愈合特性的研究,探讨水泥基材料的自愈合技术。(1)加入粉煤灰等掺合料后,水泥基材料的养护自修复效果有所降低,其中以粉煤灰的愈合效果最差,其次为矿渣、偏高岭土和硅灰；水泥基材料在经受一定的损伤后能够进行自愈合,而且随着养护龄期的增加,自愈合现象持续作用,但前期自愈合作用显著,后期趋于平缓；在热养护条件下可以最大程度的提高水泥基材料的自愈合效果；随着前期养护时间的增加,压损再标准养护后抗压强度值恢复逐渐减小；随着压损值的增大,试件受损伤的程度加深,试件再养护修复后的抗压强度值比基准试件明显减小。热水养护拥有最大电通量回复率,标准养护其次,冷水养护的效果最差,其中热水养护的效果与无压损的状态最接近；随着水灰比的升高,电通量回复率在总体上呈现不断下降的趋势。(2)渗透密封剂和硅酸钠溶液都能改善试件的抗压性能,在一定程度上修复砂浆试件在冻融循环中产生的孔隙和裂缝,增强砂浆试件本身的密实性。(3)电化学沉积方法用于水泥基材料试样裂缝的修复是可行的,电流密度是影响裂缝愈合效果的一个重要因素。采用较小的电流密度作用时,Mg(OH)2晶体的沉积速度减慢,所生成叶片状晶体结构排列紧密,强度较高。(4)本文通过正交实验制备得到了一种新型水泥基渗透结晶型修复剂。这些组分中间,作用最为突出的是活性剂,它起到了修复的主要作用；最佳方案配方为：助剂4%,硫铝酸盐水泥40%,活性剂1.5%,水泥35%。更多还原

【Abstract】 Cement based materials in a wide range of applications with the natural environment, disaster damage, the role of human factors caused by many diseases of cement based materials, and the cracking problem is the most serious of these disasters which are urgently needed to solve the problem.The traditional solution is to repair, but this passive method can not completely meet the needs of the people. This paper is the cement-based materials self-healing properties research, discussing the self-healing technology.(1) After adding admixtures, self-repairing effect of cementitious materials reduced, which the healing effects of the worst is fly ash, followed by slag, metakaolin and silica fume.Cementitious materials have self-healing characteristic when they are damaged, and along with the increasing of curing period, self-healing phenomenon is continued, but the early healing effect is remarkable, then later leveled off.When the cement based materials is in the heat curing condition, self-healing effect has the best results.As early maintenance time increaseing, pressure loss and standard curing strength value is restored gradually decreasing. With the pressure loss increases, injury degree is deepened, maintenance after repairing of compressive strength value decreases than the reference specimen.Hot water conservation has the largest flux recovery rate, standard curing secondly, water conservation is the worst, in which hot water conservation effect is the closest to no pressure loss stat.With the water cement ratio rising, flux recovery rate in general showes a declining trend.(2) Penetrating sealants and sodium silicate solution can improve the compressive performance, they can partly repair mortar specimen pores and cracks when mortar specimens are damsged under cyclic freezing and thawing and penetrating sealants and sodium silicate can reinforce mortar compactness.(3) Electrochemical deposition method for cement base material specimen fracture repairing is feasible and the current density is an important factor for the impact of crack healing effect. When the current density function is small, Mg (OH)2crystals deposition velocity are down and generating leaf-shaped crystals which have closely arranged structure and high strength.(4) Through the orthogonal experiment, this paper gets a new type of cement-based permeable crystallization repairing agent.The most prominent effect of these components is active agent, it has played a major role in repair. The optimal formula:4%auxiliaries,40%sulfur aluminate cement,1.5%active agents and35%cement.更多还原