纳米颗粒改性的粉煤灰混凝土的表面硫酸盐侵蚀研究

苏达 ·达, 维斯 马坦, 拉马 钱德, 维尼 塔乌
印度纳米科学和纳米技术中心

摘要

在混凝土与海水、沼泽水、地下水、污水和淡水等相互作用的情况下，混凝土结构的硫酸盐侵蚀是一个主
要的耐久性问题。在这项研究中，将粉煤灰（FA）和纳米颗粒等补充性胶凝材料一起加入到传统混凝土中，旨在提
高混凝土对硫酸盐渗透的抵抗力。这项工作的重点是了解用纳米颗粒改性的粉煤灰混凝土在表面硫酸盐侵蚀下的降
解情况。作者制作了 FA和用 2wt%的纳米二氧化钛（FAT）、纳米 CaCO3（FAC）以及纳米二氧化钛和纳米 CaCO3
的 1：1比例（FATC）改性的混凝土混合物。试样在 3%的硫酸铵和硫酸钠中暴露 90天。本文对所有试样的劣化效应
和微观结构特性的变化进行了比较研究。结果显示，与 FA混凝土相比，FAT、FAC和 FATC混凝土在硫酸铵和硫酸
钠溶液中已经变坏。用粉煤灰替代部份水泥，减少了可自由使用的活性铝酸盐的数量。粉煤灰对游离石灰的消耗防
止了与硫酸盐的反应。粉煤灰混凝土抗硫酸盐侵蚀的性能可以通过减少 C3A含量来实现，从而减少可用的 Ca（OH）
2，并减少有害的埃特灵石和石膏的发展可能性。

关键词

硫酸盐侵蚀；纳米颗粒；混凝土；粉煤灰

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