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Study on Chloride Ion Penetration in Fiber Reinforced Lightweight Aggregate Concrete with Load Damages(PDF)


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Study on Chloride Ion Penetration in Fiber Reinforced Lightweight Aggregate Concrete with Load Damages
ZHANG Yun-guo LI Min HAN Yue
School of Civil and Safety Engineering, Dalian Jiaotong University
load damage residual strain polypropylene fiber lightweight aggregate concrete chloride ion penetration
In order to study the influence of load damages on the chloride ion resistance of fiber reinforced lightweight aggregate concrete, three types of lightweight aggregate concrete mixed with polypropylene fiber, steel and polypropylene fiber, steel fiber were designed, respectively. And then tensile test and compression test of the three types of concrete were carried out. Stress levels of 40%, 60% and 80% of limit load were applied on the specimens for 60 s and the residual strain was measured subsequently. After loading, the specimens were cut into cylinders with the diameter of 100 mm and the height of 50 mm, and the chloride ion diffusion coefficients of the specimen were measured based on the NEL method. The research results show that the residual strain of concrete increases with the increasing of tensile and compressive load levels and the fibers can improve the ultimate strength and deformation ability of lightweight aggregate concrete significantly. For the condition without load, chloride ion diffusion coefficient only for the group with polypropylene fiber added decreases with the increasing of fiber volume fraction, that of the steel and polypropylene hybrid fiber reinforced group keeps mostly unchangeable and the steel fiber reinforced group increases significantly. After loading, there is no substantial improvement on concrete chloride ion penetration resistance with the increasing of the volume fraction of fibers. The positive correlation exists between residual strain and diffusion coefficients of chloride ion for fiber reinforced lightweight concrete. The greater residual strain is, the greater diffusion coefficient of chloride ion is.



Last Update: 2018-07-18