Using graphene oxide to improve physical property and control ASR expansion of cement mortar

Jianlin Luo, Chen Zhou, Wengui Li, Sujian Chen, Asghar Habibnejad Korayem, Wenhui Duan

Research output: Contribution to journalArticleResearchpeer-review

7 Citations (Scopus)

Abstract

Alkali-silica reaction (ASR) is a slowly occurring reaction in concrete between alkaline pore solution and reactive non-crystalline silica in aggregates, which is a challenge to physical property and durability of concrete. The oxygen-containing functional groups coupled with large surface area of graphene oxide (GO) nanomaterial renders highly reactive interaction with cement-based composite. Here, the physical properties and ASR expansion test of cement mortars modified with varied loadings of GO (wGO) or/and Pyrex glass (GOPM) were implemented after optimizing GO dispersion efficiency in water. The water absorption and microstructures of GOPM were observed to figure out the mechanism of GO's effect on mechanical strength, permeability, and ASR expansion of GOPM. Results show, 15 kJ is the optimal sonication energy for the dispersion of 300 mL pristine GO-water suspension with 0.04% wGO; the effect of GO on improving the flexural and compressive strength of GOPM is remarkable, the maximal amplitude is up to 24.16%, 43.03% compared with the baseline, respectively; GO has great influence on long-term anti-permeability and controlling expansion, the nano-nucleation and interlocking effect of GO render the expansion rate of GOPM be well below 0.1% threshold.

Original languageEnglish
Article number125006
Number of pages10
JournalConstruction and Building Materials
Volume307
DOIs
Publication statusPublished - 8 Nov 2021

Keywords

  • Alkali-silica reaction (ASR)
  • Anti-penetration
  • Cement mortar
  • Graphene oxide (GO)
  • Mechanical property
  • Microstructure

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