Effects of lightweight particle content on the mechanical strength of cylindrical aggregates

  • Ho Van Nhat Phong University of Science and Technology - The University of Danang, 54 Nguyen Luong Bang street, Lien Chieu district, Da Nang City, Vietnam
  • Vo Thanh Trung Department of Research and International Affairs, Danang Architecture University, 566 Nui Thanh street, Da Nang city, Vietnam https://orcid.org/0000-0003-0259-7165
  • Tran Dinh Minh Faculty of Road and Bridge Engineering, University of Science and Technology - The University of Danang, 54 Nguyen Luong Bang street, Lien Chieu district, Da Nang city, Vietnam
  • Nguyen Van My Faculty of Road and Bridge Engineering, University of Science and Technology - The University of Danang, 54 Nguyen Luong Bang street, Lien Chieu district, Da Nang city, Vietnam
  • Vu Thi Lo Ton Duc Thang University, 19 Nguyen Huu Tho street, District 7, Ho Chi Minh city, Vietnam
Keywords: discrete element method, capillary cohesion, compression test, lightweight particle content, stiffnesses

Abstract

By using an extensive three-dimensional discrete element method, we numerically investigate the effects of lightweight particle content on the mechanical strength of the cylindrical aggregates, randomly composed of two different groups of primary particles: light (low stiffness) and heavy (high stiffness), and the stress contribution of the heavy-heavy, light-heavy, and light-light interactions on the mechanical behavior of such aggregates, subjected to the compression test by using a constant downward velocity. The interactions between primary particles are modeled by using the frictional-contact force law with a giving approximate analytical expression of capillary cohesion forces. We found that the lightweight particle content significantly affects the mechanical stress of aggregates and stress contribution obtained by different interaction types above, and the stress obtained by heavy-heavy interactions strongly dominates the mechanical strength of agglomerates. Remarkably, meanwhile, the stress obtained by the heavy-heavy contacts gradually decreases with increasing the lightweight particle content up to 20%, leading to the decrease of the mechanical strength, the stresses obtained by light-light and light-heavy contacts increase gradually. For higher lightweight particle contents, the results continuously show the same tendencies but with lower rates.

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Published
29-04-2022
How to Cite
Phong, H. V. N., Trung, V. T., Minh, T. D., My, N. V., & Lo, V. T. (2022). Effects of lightweight particle content on the mechanical strength of cylindrical aggregates. Journal of Science and Technology in Civil Engineering (STCE) - HUCE, 16(2), 117-127. https://doi.org/10.31814/stce.huce(nuce)2022-16(2)-10
Section
Research Papers