硬脂酸盐改性碱矿渣砂浆的抗硫酸盐物理侵蚀性能

Resistance of Stearate-Modified Alkali-Activated Slag Mortar against Physical Sulphate Attack

测试分析了不同种类硬脂酸盐改性碱激发矿渣(AAS)抗硫酸盐物理侵蚀性能及其变化规律.结果表明:在干湿循环条件下AAS受到明显物理结晶损伤;加入硬脂酸钙(CaSt)、硬脂酸钠(NaSt)后能通过降低吸水速率、改善内部孔结构、减小表观损伤,来提升AAS半浸泡-干湿循环下的抗硫酸钠物理结晶破坏能力;硬脂酸钾(KSt)的加入则加剧了AAS硫酸钠物理结晶破坏.

Three types of stearates were used to modify alkali‑activated slag(AAS)and the variation of its performance was examined and analysed under sodium sulphate environment.AAS exhibits significant physical crystallisation damage under wet‑dry cycles of sodium sulphate.The addition of calcium stearate(CaSt)and sodium stearate(NaSt)can improve the resistance of AAS against physical crystallisation damage of sodium sulphate by decreasing its sorptivity,optimizing its micro‑structure,and mitigating its appearance damage in the semi‑immersion‑wet‑dry cycle environment,whereas the potassium stearate(KSt)exacerbates the physical crystalline damage of sodium sulphate of AAS.