Artificial alkali-activated aggregates developed from wastes and by-products: A state-of-the-art review

Lan-Ping Qian, Ling-Yu Xu, Yazan Alrefaei*, Tiao Wang, Tetsuya Ishida, Jian-Guo Dai*

*Corresponding author for this work

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

100 Citations (Scopus)

Abstract

Natural resources depletion is gradually becoming a critical burden on the environmental and ecological balance, pushing the development of artificial aggregates forward. In order to curb the shortage issues of natural aggregates and minimize the destruction of land topography, alkali-activated aggregates (AAA) have gradually become a hot topic in recent years as a new application of alkali-activated materials (AAM) with the benefits of utilizing industrial by-products and waste materials. This article provides an overall review of the manufacturing process and engineering properties of two types of artificial aggregates, cold-bonded AAA (CB-AAA) and sintered AAA (ST-AAA). Their applications in concrete, besides the mechanical evaluation, durability performance, and leaching behavior, are summarized based on the existing research outcomes. Finally, the future perspectives and challenges of artificial aggregates development are also proposed. © 2021 Elsevier B.V.
Original languageEnglish
Article number105971
JournalResources, Conservation and Recycling
Volume177
Online published22 Oct 2021
DOIs
Publication statusPublished - Feb 2022
Externally publishedYes

Funding

The authors would like to acknowledge the financial support received from NSFC/RGC Joint Research Scheme (N_PolyU542/20), The Hong Kong Polytechnic University through the Research Institute for Sustainable Urban Development (No.1-BBWE), Kijima International Joint Research Fund (2021), and the Hong Kong Polytechnic University Ph.D. studentship awarded to the first and second authors.

Research Keywords

  • Alkali-activated aggregates (AAA)
  • Alkali-activated materials (AAM)
  • Durability
  • Geopolymer
  • Mechanical properties
  • Waste

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