大掺量矿物掺合料对铝酸盐水泥浆体性能的影响

研究了大掺量矿物掺合料与铝酸盐水泥复合浆体的抗压强度、电阻率、化学收缩和XRD的变化规律。结果表明,在淡水和海水环境下,一定量(40%以内)矿渣的掺入有利于促进铝酸盐水泥强度的发展,有效抑制了铝酸盐水泥后期强度倒缩;矿物掺合料可提高铝酸盐水泥抗海水侵蚀性能;铝酸盐水泥浆体的电阻率与化学收缩之间存在良好的相关性,水泥浆体的电阻率和化学收缩随着矿物掺合料掺量的增大而减小;在水化早期,矿渣和粉煤灰均未参与铝酸盐水泥的水化过程;矿渣在后期生成稳定的水化产物C_2ASH_8,其抑制晶相转变的效果较粉煤灰更为显著。

The Influence of High-volume Mineral Admixture on Performance of Calcium Aluminate Cement Paste

The effect of high-volume mineral admixture on the compressive strength, electrical resistivity chemical shrinkage, XRD of calcium aluminate cement were investigated. The results show that the incorporation of a certain amount (within 40%) of slag is beneficial to promote the strength development and inhibit the late strength decreasing of calcium aluminate cement in freshwater and seawater environments. Adding mineral admixtures is an effective way to improve the corrosion resistance of aluminate cement in seawater. The belectrical resistivity and chemical shrinkage of aluminate cement paste exists a good correlation, the electrical resistivity and chemical shrinkage of cement paste decrease with the increase of mineral admixture. In the early stage of hydration, slag and fly ash are not participate in the hydration process of calcium aluminate cement. The slag promotes the formation of stable hydration product C2ASH8, therefore, it has better effect of inhibiting crystal phase transformation than fly ash.