水泥类型对含铝粉的外加剂作用的影响

埃米 莉亚, 卡米 尔·, 维奥 莱塔, 贾西 娜·
波兰建筑材料工程系

摘要

本文研究了水泥类型对增加混凝土体积的外加剂（含铝粉）作用的影响，其使用量为水泥质量的 0.5-1.5%。试 验是在使用波特兰（CEM I）和磨细的高炉矿渣水泥（CEM III）的水泥砂浆上进行的。本研究对测试的砂浆进行了以下 试验：新鲜砂浆中的空气含量、抗压强度、抗折强度、砂浆体积的增加、体积密度、孔隙结构评估（通过计算机图像 分析方法）以及使用的水泥水化过程中 OH-离子浓度的变化。在测试中发现，由于使用的水泥不同，所测试的掺合物 的作用也有差异。为了诱发 CEM III 砂浆的膨胀，需要比 CEM I 水泥更少的外加剂量。使用超过水泥质量 1%的掺合物会 导致 CEM III 水泥砂浆出现裂缝，这是因为在砂浆塑性丧失后会出现缓慢的氢气演化。使用含铝掺合物会降低水泥砂浆 的强度性能，在 CEM III 水泥的情况下影响更大。本研究还发现了样品成型时间对掺合物作用的影响.

关键词

铝粉；混凝土膨胀；波特兰水泥；磨细的高炉矿渣水泥

参考

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