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<p>Slag and PMA were used as precursors, while Ca(OH)<sub>2</sub> and Na<sub>2</sub>CO<sub>3</sub> were used as the alkaline activator. The impact of alkali-activated slag-PMA (ASP) content, defined as the mass ratio of ASP to the total of ASP and desulfurized gypsum (0, 10%, 20%, 30%, and 40%), on the drying time, setting time, dry density, fire resistance, compressive strength, bond strengths (<i>W</i><sub>0</sub>), and wind suction &amp; vibration resistance (<i>W</i><sub>a</sub>) was explored. The underlying mechanism was revealed by XRD, TG-DTG, SEM and MIP. The experimental results indicate that, as ASP content rises, the drying time, initial setting time and final setting time are shortened, and the fire resistance of DAF first decreases and then increases, being worst at 30%. As ASP content increases, the compressive strength, <i>W</i><sub>0</sub> and <i>W</i><sub>a</sub> first go up then drop, peaking at 20%. When ASP content increases from 0 to 20%, the hydration products increase and large pore reduce, thus increasing <i>W</i><sub>0</sub> and <i>W</i><sub>a</sub>. When ASP content increases from 20% to 40%, the hydration products decrease, and the higher ASP content results in more internal cracks, causing to a decrease in <i>W</i><sub>0</sub> and <i>W</i><sub>a</sub>. The research findings will promote the application of PMA in DAF.</p>

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Desulfurized Gypsum/Alkali-activated Slag-PMA Lightweight Fireproof Mortar: Impact of ASP Content on Microstructure and Performance

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • Wanli Ye,
  • Xianhui You,
  • Huaqiang Sun,
  • Qinfei Lü,
  • Yao Wang,
  • Tao Ji

摘要

Slag and PMA were used as precursors, while Ca(OH)2 and Na2CO3 were used as the alkaline activator. The impact of alkali-activated slag-PMA (ASP) content, defined as the mass ratio of ASP to the total of ASP and desulfurized gypsum (0, 10%, 20%, 30%, and 40%), on the drying time, setting time, dry density, fire resistance, compressive strength, bond strengths (W0), and wind suction & vibration resistance (Wa) was explored. The underlying mechanism was revealed by XRD, TG-DTG, SEM and MIP. The experimental results indicate that, as ASP content rises, the drying time, initial setting time and final setting time are shortened, and the fire resistance of DAF first decreases and then increases, being worst at 30%. As ASP content increases, the compressive strength, W0 and Wa first go up then drop, peaking at 20%. When ASP content increases from 0 to 20%, the hydration products increase and large pore reduce, thus increasing W0 and Wa. When ASP content increases from 20% to 40%, the hydration products decrease, and the higher ASP content results in more internal cracks, causing to a decrease in W0 and Wa. The research findings will promote the application of PMA in DAF.