Long-term investigation of alkali-silica reaction behaviors in seawater sea-sand concrete

Yangyang Zhang, Xiaodong Xu, Qingxin Zhao, Jun Chang, Siqi Ding, Xiaozhou Liu, Chi Sun Poon

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)

Abstract

The potential sustainability and cost-effectiveness of seawater sea-sand concrete (SWSSC) have sparked widespread research interest and prompted extensive applied studies. However, the understanding of the alkali-silica reaction (ASR) in SWSSC is still lacking. In this work, the long-term ASR of SWSSC and the characterization of ASR gel was investigated. The result illustrated that the specimens mixed with either seawater or NaCl solution would show long-term ASR expansion, degrading the pore structure and forming ASR cracks. With the increase of sodium ion concentration, higher expansion and larger crack width were observed. Nanoindentation tests further revealed the evolution of ASR damage. The ASR gel produced in SWSCC had a white appearance and consisted of numerous interwoven sheet-like structures forming a honeycomb-like network. Its elastic modulus and hardness were 14.77 GPa and 0.35 GPa, respectively. In addition, the increase of sodium ion concentration would promote the formation of ASR gel but reduce the polymerization degree and the average chain length of the C–S–H, increasing the amount of gel pores.

Original languageEnglish
Article number105611
JournalCement and Concrete Composites
Volume151
DOIs
Publication statusPublished - Aug 2024

Keywords

  • Alkali-silica reaction gel
  • Long-term alkali-silica reaction
  • Recycled glass aggregate
  • Seawater sea-sand concrete

ASJC Scopus subject areas

  • Building and Construction
  • General Materials Science

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