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March 21, 2026Scientific ReportsOpen Access

Comparison of the effects of different expansion agents on alkali-activated rapid repair mortars: workability, mechanical properties, drying shrinkage

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Authors

XLXiaofeng LuoNorth University of ChinaMXMingxing XiJiangxi University of TechnologyLHLiang HuangHunan University

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Implication

Comparison evaluates effects of expansion agents on early-age performance and shrinkage in repair mortars, suggesting optimal formulations.

Key Points

  • The aim is to evaluate the effectiveness of different expansion agents on mitigating drying shrinkage and enhancing the mechanical properties of alkali-activated repair mortars.
  • Comparison of three types of expansion agents: MgO-based (MEA), CaO-based (CSEA), and calcium sulfoaluminate-based (SEA).
  • Use of X-ray diffraction, thermogravimetric analysis, and scanning electron microscopy to analyze microstructure.
  • Measurement of setting times and compressive strength at various intervals.
  • Increasing the amount of expansive agents significantly reduced initial and final setting times.
  • CSEA at 8% content achieved a 6-hour compressive strength of 25.0 MPa.
  • SEA improved early strength and mitigated drying shrinkage but led to microcracking over time.

Cite This Study

Luo et al. (2026) studied this question.

synapsesocial.com/papers/69be34af6e48c4981c672d80https://doi.org/10.1038/s41598-026-43508-6
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