Engineered cementitious composites(ECC),also known as bendable concrete,were developed based on engineering the interactions between fibers and cementitious matrix.The orientation of fibers,in this regard,is one of the major factors influencing the ductile behavior of this material.In this study,fiber orientation distributions in ECC beams influenced by different casting techniques are evaluated via numerical modeling of the casting process.Two casting directions and two casting positions of the funnel outlet with beam specimens are modeled using a particle-based smoothed particle hydrodynamics(SPH)method.In this SPH approach,fresh mortar and fiber are discretized by separated mortar and fiber particles,which smoothly interact in the computational domain of SPH.The movement of fiber particles is monitored during the casting simulation.Then,the fiber orientations at different sections of specimens are determined after the fresh ECC stops flowing in the formwork.The simulation results show a significant impact of the casting direction on fiber orientation distributions along the longitudinal wall of beams,which eventually influence the flexural strength of beams.In addition,casting positions show negligible influences on the orientation distribution of fibers in the short ECC beam,except under the pouring position.

Chung Nguyen VAN;Hai TRAN THANH;Thuc Nhu NGUYEN;Jianchun LI

Faculty of Civil Engineering,Ho Chi Minh City University of Technology and Education,Ho Chi Minh 721400,Vietnam;School of Civil and Environmental Engineering,University of Technology Sydney,Sydney,NSW2007,Australia;School of Civil Engineering,Hue Industrial College,Hue 49120,Vietnam

结构与土木工程前沿

[1]Chung Nguyen VAN;Hai TRAN THANH;Thuc Nhu NGUYEN;Jianchun LI-.Numerical investigation of the influence of casting techniques on fiber orientation distribution in ECC)[J].结构与土木工程前沿,2022(11):1424-1435

formwork

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