Use of recycled aggregates in molded concrete bricks and blocks

Chi Sun Poon, S. C. Kou, L. Lam

Research output: Journal article publicationJournal articleAcademic researchpeer-review

350 Citations (Scopus)


This study aimed to develop a technique for producing concrete bricks and paving blocks using recycled aggregates obtained from construction and demolition waste. Laboratory trials were conducted to investigate the possibility of using recycled aggregates from different sources in Hong Kong, as the replacement of both coarse and fine natural aggregates in molded bricks and blocks. A series of tests were carried out to determine the properties of the bricks and blocks prepared with and without recycled aggregates. The test results showed that the replacement of coarse and fine natural aggregates by recycled aggregates at the levels of 25 and 50% had little effect on the compressive strength of the brick and block specimens, but higher levels of replacement reduced the compressive strength. However, the transverse strength of the specimens increased as the percentage of replacement increased. Using recycled aggregates as the replacement of natural aggregates at the level of up to 100%, concrete paving blocks with a 28-day compressive strength of not less than 49 MPa can be produced without the incorporation of fly ash, while paving blocks for footway uses with a lower compressive strength of 30 MPa and masonry bricks can be produced with the incorporation of fly ash.
Original languageEnglish
Pages (from-to)281-289
Number of pages9
JournalConstruction and Building Materials
Issue number5
Publication statusPublished - 1 Jul 2002


  • Compressive strength
  • Concrete bricks and blocks
  • Construction and demolition waste
  • Recycled aggregates

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Materials Science(all)


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