Experimental Investigation on Durability Damage of Polypropylene Fiber Reinforced Concrete in Saline and Dry Cold Region of Northwest China
ZHANG Bingzong1, GONG Li1,2,*, DU Qiangye1, LIANG Ying1, GONG Xuelei1, DU Xiuping3
1 School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China 2 Institute of Water Diversion Engineering and Water Security, Lanzhou Jiaotong University, Lanzhou 730070, China 3 Baoding Survey and Design Institute of Water Conservancy and Hydro Power, Baoding 071000, Hebei, China
Abstract: The normal use of concrete is severely affected by engineering diseases such as salt swelling, melt sinking and corrosion in a certain environment of saltness-dryness-coldness in the northwest of China. Datong River-Qingwangchuan Water Diversion Project was selected as a research scope in order to study the outstanding problems of concrete durability. On the basis of collecting concrete residue samples within the research scope, the concrete residue was analyzed by XRD to determine the corrosion product. At the same time, an indoor deterioration accelerated test was designed based on the corrosion mechanism of concrete to analyze the propagation of internal pores in concrete from a meso-level perspective by using nuclear magnetic resonance technology. Combining with SEM observations, durability indicators such as relative dynamic elastic modulus, compressive properties and the mass loss rate were selected to explore the law and characteristics of the durability damage process of polypropylene fiber reinforced concrete (PFRC). The results show that polypropylene fiber can increase the number of cycles of concrete in the compound salt solution and effectively reduce shedding. When the test is stopped, the mass loss of PFRC with a dosage of 0.9 kg/m3 is reduced by 3.61% compared with that of ordinary concrete. From the meso-level, polypropylene fiber slightly improves the microscopic pore structure of concrete after pouring. In the ‘accelerated deterioration' stage of concrete, polypropylene fiber can effectively inhibit the increase of pores and non-capillary pores in concrete. From the micro-level, the corrosion products generated in the internal pores of concrete are the main reason of the propagation of cracks; polypropylene fiber cannot prevent the formation of corrosion products such as ettringite and gypsum.
张秉宗, 贡力, 杜强业, 梁颖, 宫雪磊, 杜秀萍. 西北盐渍干寒地区聚丙烯纤维混凝土耐久性损伤试验研究[J]. 材料导报, 2022, 36(17): 21030317-7.
ZHANG Bingzong, GONG Li, DU Qiangye, LIANG Ying, GONG Xuelei, DU Xiuping. Experimental Investigation on Durability Damage of Polypropylene Fiber Reinforced Concrete in Saline and Dry Cold Region of Northwest China. Materials Reports, 2022, 36(17): 21030317-7.
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2022, Vol. 36 
