The Drawing Characteristics and Critical Length of Single Polypropylene Fiber in Vegetation Concrete
2022
Daxiang Liu, Deyu Liu, Baohua Zhang, Bin Zhong, Yueshu Yang, Jiangang Chen, Yu Ding, Zhenyao Xia and Wennian Xu
Fiber-reinforced technology is an important method to improve the stability and durability of growing basis material. To evaluate the factors affecting the interfacial strength properties of polypropylene fiber reinforced vegetation concrete, single polypropylene fiber drawing tests were conducted by using a modified apparatus. The mechanical interaction behavior between vegetation concrete and polypropylene fiber was discussed by using a polarizing microscope. The results indicate that the drawing curves between polypropylene fiber and vegetation concrete show a typical multi-peak characteristic. And the interfacial shear strength is the minimum at the optimum water content (20%) in the 1d sample. It should be noted that both interfacial peak strength (IPS) and interfacial residual strength (IRS) increase with the increase of dry density and curing time for vegetation concrete. Then through multiple linear regression analysis, the empirical formula of critical fiber length in reinforced vegetation concrete is obtained, which can improve the engineering durability of vegetation concrete in harsh conditions.
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