基于电阻率法研究矿物掺合料对铝酸盐水泥水化的影响

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借助电阻率测定仪、XRD等研究了粉煤灰、矿渣或硅灰的掺入对铝酸盐水泥浆体凝结时间、电阻率、化学收缩、抗压强度以及水化产物的影响。结果表明,水泥浆体的凝结时间对应于其电阻率变化曲线的下降段,掺入硅灰能明显缩短水泥浆体的凝结时间。矿物掺合料的掺入可减少水泥浆体的化学收缩,提高其化学收缩速率峰值。相较于硅灰和粉煤灰,掺入矿渣可有效提高硬化水泥浆体在较长龄期时的抗压强度,且有助于水化钙铝黄长石(C2ASH8)的生成,具有较强地抑制铝酸盐水泥晶相转变的作用。
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