寒冷地区硫铝酸盐基水泥混凝土路面修补材料及性能研究

发布时间：2018-02-28 04:34

本文关键词： 硫铝酸盐水泥水泥混凝土路面损伤力学性能耐久性能修补应用　出处：《哈尔滨工业大学》2016年硕士论文　论文类型：学位论文

【摘要】：随着我国经济实力飞速增长,机动车数量成倍增加,物流运输业的发展快速,公路交通中路面损伤日益严重。尤其是对于身处自然环境恶劣的寒冷地区,路面损伤更加严重,这不但影响路面的美观,同时还影响道路的正常使用,严重时甚至会造成交通事故。水泥混凝土路面在公路交通中发挥着重要作用,在长期的自然环境及车载等因素的共同作用下,也出现了多种形式的路面损伤,亟待修补养护。因此,研究水泥混凝土路面修补材料就显得尤为重要。硫铝酸盐水泥(Sulphate Aluminium Cement简称SAC)因具有快硬早强的优点,用其来制备路面修补材料具有很大的优势。因此,本课题开展以SAC为胶凝材料的缓凝型聚丙烯纤维增强砂浆(Retarding polypropylene fibers reinforced mortar简称RPFRM)的研究。主要包括RPFRM的配合比优化,力学性能以及耐久性能的研究。并对RPFRM进行水泥混凝土路面损伤修补模拟及实际工程应用研究。研究得出修补材料RPFRM在硫铝酸盐水泥中加入0.6%硼砂,6%硅灰,14%矿渣粉,0.9kg/m3聚丙烯纤维(Polypropylene Fibers简称PFs)时,流动性能良好。此时RPFRM 3d抗压强度44MPa,抗折强度5.6MPa,粘结强度3.8MPa、修补后新旧材料间抗剪切破坏力4.5KN;28d抗压强度45.6MPa,抗折强度6.2MPa,粘结强度5.2MPa、修补后新旧材料间抗剪切破坏力4.9KN。可见RPFRM具有良好的力学性能。并且其修补后试件的干缩率为0.334×10-3与被修补材料的收缩相近。氯离子渗透试验后RPFRM试件的总电通量为1435(C);经过150次干湿循环,RPFRM试件的耐蚀系数为98.7%;经过300次冻融循环,RPFRM试件的质量损失率1.59%,声速损失率30.79%。证明RPFRM具有良好的抗Cl-渗透,抗SO42-腐蚀和抗冻能力。将研究得出的RPFRM用于水泥混凝土路面损伤修补的实际工程应用并进行经济分析。经历气候环境及车载的耦合影响作用,证明RPFRM具有价格低廉,修补效果良好的优势。
[Abstract]:With the rapid growth of China's economic strength, the number of motor vehicles has increased exponentially, the development of logistics transportation industry has been rapid, the road surface damage in road traffic is becoming increasingly serious, especially in the cold areas where the natural environment is bad, the road surface damage is even more serious. This not only affects the beauty of the road, but also affects the normal use of the road, and even causes traffic accidents when serious. Cement concrete pavement plays an important role in highway traffic. In the long-term natural environment and vehicle and other factors together, there are also a variety of forms of pavement damage, urgent need to repair and maintain. It is very important to study cement concrete pavement repair material. Sulphate Aluminium Cement has a great advantage in preparing pavement repair material because of its advantages of quick hardening and early strength. In this paper, the study of retarded polypropylene fibers reinforced mortar with SAC as cementing material is carried out. The mechanical properties and durability of cement concrete pavement were studied. The damage repair simulation of cement concrete pavement and practical engineering application of RPFRM were carried out. It was found that the repair material RPFRM was added 0.6% borax 6% silica fume 14% slag to sulphoaluminate cement. When the polypropylene fiber is 0.9 kg / m ~ 3, the polypropylene Fibers is for short, RPFRM 3D compressive strength 44MPa, flexural strength 5.6MPa, bond strength 3.8MPa, shear failure strength 4.5KN / 28d, flexural strength 6.2MPa, bond strength 5.2MPa, shear failure strength between new and old materials after repair. 4.9KN. it can be seen that RPFRM has good mechanical properties, and its dry shrinkage rate of 0.334 脳 10 ~ (-3) is close to that of repaired material. The total electric flux of RPFRM specimen after chloride ion permeation test is 1435 ~ C ~ (-1). The corrosion resistance coefficient is 98.7. After 300 cycles of freeze-thaw cycles, the mass loss rate of RPFRM specimen is 1.59 and the sound velocity loss rate is 30.79. It is proved that RPFRM has good resistance to Cl-permeation. The application of RPFRM to cement concrete pavement damage repair and its economic analysis. Through the coupling effect of climate environment and vehicle, it is proved that RPFRM has low price. The advantage of good repair effect.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U418.6

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