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<p>Sulfoaluminate cement-based grouting materials (SAGMs) include sulfoaluminate cement clinker, anhydrite, and quicklime. They are widely applied in engineering due to their fast hydration rate, short setting period, and high compressive strength. To maintain the slurry’s permeability and fluidity at the start, a high water-cement ratio and water-reducing agents are typically employed. At present, the PCEs available on the market are almost all designed to&#xa0;improve&#xa0;the fluidity of Portland cement. When they are applied to SAGMs, segregation and bleeding may occur, potentially affecting the workability of the SAGMs. In this paper, polymers of acrylic acid (AA), acrylamide (AM), and 2-acrylamido-2-methylpropane sulfonic acid (AMPS) (denoted as P(AA-AMPS-AM)) were synthesized, and the influence of the sulfonic acid group content in the polymer on the hydration and hardening performance of SAGMs was studied. The findings indicate that as the dosage of sulfonic acid groups in P(AA-AMPS-AM) increases from 39 to 99%, the initial fluidity of SAGMs rises from 230 to 360&#xa0;mm. Additionally, the heat release rate of slurry hydration gradually decreases, the zeta potential drops, and the adsorption capacity of P(AA-AMPS-AM) onto SAGMs slurry increases from 1.1 to 8.3&#xa0;mg g<sup>−1</sup>. P(AA-AMPS-AM) inhibits the dissolution of anhydrite and anhydrous calcium sulfoaluminate. With the increase in sulfonic acid group content, P(AA-AMPS-AM) decreases the amount of ettringite but increases the amount of aluminum gel. Additionally, the form of ettringite gradually transitions from elongated rods to shorter columns. Based on the above reasons, the P(AA-AMPS-AM) delays the hydration of SAGMs, thereby improving the fluidity.</p>

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The influence of sulfonic acid group content in P(AA-AMPS-AM) on the properties of sulphoaluminate cement-based grouting materials

  • 期刊论文

  • 发表日期：

    2026年2月25日

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  • Haiyan Li,
  • Mengke Chang,
  • Huili Zhang,
  • Mingwei Song

摘要

Sulfoaluminate cement-based grouting materials (SAGMs) include sulfoaluminate cement clinker, anhydrite, and quicklime. They are widely applied in engineering due to their fast hydration rate, short setting period, and high compressive strength. To maintain the slurry’s permeability and fluidity at the start, a high water-cement ratio and water-reducing agents are typically employed. At present, the PCEs available on the market are almost all designed to improve the fluidity of Portland cement. When they are applied to SAGMs, segregation and bleeding may occur, potentially affecting the workability of the SAGMs. In this paper, polymers of acrylic acid (AA), acrylamide (AM), and 2-acrylamido-2-methylpropane sulfonic acid (AMPS) (denoted as P(AA-AMPS-AM)) were synthesized, and the influence of the sulfonic acid group content in the polymer on the hydration and hardening performance of SAGMs was studied. The findings indicate that as the dosage of sulfonic acid groups in P(AA-AMPS-AM) increases from 39 to 99%, the initial fluidity of SAGMs rises from 230 to 360 mm. Additionally, the heat release rate of slurry hydration gradually decreases, the zeta potential drops, and the adsorption capacity of P(AA-AMPS-AM) onto SAGMs slurry increases from 1.1 to 8.3 mg g−1. P(AA-AMPS-AM) inhibits the dissolution of anhydrite and anhydrous calcium sulfoaluminate. With the increase in sulfonic acid group content, P(AA-AMPS-AM) decreases the amount of ettringite but increases the amount of aluminum gel. Additionally, the form of ettringite gradually transitions from elongated rods to shorter columns. Based on the above reasons, the P(AA-AMPS-AM) delays the hydration of SAGMs, thereby improving the fluidity.