AN EMPIRICAL STUDY OF THE BEHAVIOR OF RECYCLED AGGREGATE CONCRETE BEAMS FROM CDW IN HANOI, VIETNAM

Authors

  • Ha Tan Nghiem
  • Tran Viet Cuong
  • Nguyen Ngoc Tan
  • Phan Quang Minh
  • Nguyen Tien Dung
  • Ken Kawamoto
  • Nguyen Hoang Giang

Keywords:

Construction and demolition waste, Recycled aggregate concrete, Flexural strength, Reinforced concrete beam

Abstract

The employment of recycled materials from construction and demolition waste (CDW) for mixing recycled aggregate concrete (RAC) is widely practiced in developed countries. In Vietnam, however, being a developing country with a rapid rate of urbanization, especially in major cities, the substantial amount of CDW generated is still mainly treated by landfilling. To promote the recycling of CDW, studies of the performance of structural members fabricated with recycled aggregates must be conducted, which are lacking in quantity in Vietnam. Adopting a standard experiment set up of reinforced beams, the study employed local recycled coarse aggregates in Hanoi, Vietnam, produced from crushed concrete and crushed brick (which is mixed with crushed concrete at controlled percentages) to conduct experiments to observe flexural behaviors with reference to equivalent natural aggregate concrete (NAC) such as cracking load, ultimate load, crack pattern, crack width, etc. The results showed that the ultimate loads were only reduced by less than 10% for all percentages of recycled coarse aggregate produced from crushed brick in the concrete mix, compared to the reference beams using NAC. However, the cracking loads of RAC beams were significantly reduced by 17.86% to 50.45% when increasing the content of crushed brick from 0% to 70%. Moreover, together with an increase in the number of flexural cracks, the deflections of RAC beams also increased with increasing content of crushed brick, demonstrating a reduction in the stiffness of the beams. These observations may serve as recommendations to structural engineers in Vietnam when designing flexural RAC members.

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Published

2024-06-30

How to Cite

Ha Tan Nghiem, Tran Viet Cuong, Nguyen Ngoc Tan, Phan Quang Minh, Nguyen Tien Dung, Ken Kawamoto, & Nguyen Hoang Giang. (2024). AN EMPIRICAL STUDY OF THE BEHAVIOR OF RECYCLED AGGREGATE CONCRETE BEAMS FROM CDW IN HANOI, VIETNAM. GEOMATE Journal, 26(118), 122–132. Retrieved from https://geomatejournal.com/geomate/article/view/4595

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