Mechanical and thermal properties of lightweight concrete with recycled expanded polystyrene beads

Sherif El-Gamal*, Yousuf Al-Jardani, Seddik Meddah, Kazi Md Abu Sohel, Abdullah Hilal Al-Saidy

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Recycled expanded polystyrene (EPS) beads were used as a partial replacement for concrete mix components to develop lightweight concrete mixes with good thermal insulation properties. The replacement ratios were 50, 55, and 60% of the total mix volume. Workability, compressive, flexural, splitting tensile strengths, and thermal conductivities were evaluated. Two casting methods were investigated (with and without compaction). The results showed that using the recycled EPS beads significantly reduced the density, thermal conductivities, and mechanical properties of the mixes. Compared to the control mix, the decrease in the density ranged between 37% and 46% for the compacted samples and between 52% and 60% for the un-compacted samples. The thermal conductivities decreased by about 63% to 74% for the compacted samples and by about 78% to 85% for the un-compacted samples, which makes them efficient in thermal insulation applications. The decrease in the compressive strength ranged from 87% to 94% for the compacted samples and from 97% to 98% for the un-compacted samples. The test results revealed that the compacted samples with 50% and 55% of EPS achieved compressive strengths of 7.2 and 5.1 MPa, respectively. This makes them suitable for environmentally friendly non-structural applications with good thermal insulation properties.
Original languageEnglish
Pages (from-to)80-94
Number of pages15
JournalEuropean Journal of Environmental and Civil Engineering
Issue number1
Publication statusPublished - Apr 12 2023


  • Expanded polystyrene (EPS) beads
  • compressive strength
  • flexural strength
  • lightweight concrete
  • split tensile strength
  • thermal conductivity

ASJC Scopus subject areas

  • Environmental Engineering
  • Civil and Structural Engineering

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