Performance assessment of core-shell structured lightweight aggregate produced by cold bonding pelletization process

Feras Tajra, Mohamed Abd Elrahman, Sang Yeop Chung, Dietmar Stephan

Research output: Contribution to journalArticlepeer-review


The density of cold-bonded lightweight aggregates is significantly higher than that of sintered lightweight aggregates. Since the sintering technique consumes an enormous amount of energy and emits a huge amount of pollutants, the implementation of a cold-bonded method, in manufacturing low-density lightweight aggregates, is very important from an economic and environmental perspective. In this study, a cold bonding granulation technique was employed to produce low-density lightweight aggregate by the encapsulation of expanded perlite particles in shell structures. A variety of tests were conducted to evaluate the physical and mechanical properties of the aggregate produced. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to study the microstructure and the phase composition of the aggregate. Furthermore, X-ray micro-computed tomography (CT) was performed to investigate the pore system of the aggregate specimens. The obtained results showed that by adopting the angle and speed of pelletizer disc, a core-shell structured lightweight aggregates with particle density of 0.88–1.14 g/cm3 and bulk crushing strength of 2.04–2.66 MPa can be produced.

Original languageEnglish
Pages (from-to)220-231
Number of pages12
JournalConstruction and Building Materials
Publication statusPublished - 2018 Aug 10

Bibliographical note

Funding Information:
The authors gratefully acknowledge the financial support of the German Academic Exchange Service (DAAD, Ref. no.: 91580050 ) in this research project. In addition, the authors would like to thank Dr.-Ing. Christian Lehmann (TU-Berlin) for his assistance in the XRD and SEM measurements.

Publisher Copyright:
© 2018 Elsevier Ltd

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)


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