佟 钰，闫海敏，王昭宁，丁向群，万 晔
(沈阳建筑大学 材料科学与工程学院，辽宁 沈阳 110168)
DOI:10.13732/j.issn.1008-5548.2022.05.002
收稿日期： 2022-02-09， 修回日期：2022-04-20。
基金项目：辽宁省“兴辽英才计划”项目，编号：XLYC2002005。
第一作者简介：佟钰(1972—)，男，副教授，博士，研究方向为新型建筑材料的制备与应用。E-mail:tong_yu123@hotmail.com。
摘要：在抗渗混凝土优化配比的基础上，采用纳米二氧化硅部分取代硅灰，考察纳米二氧化硅粒径和掺量对水泥砂浆抗压强度和抗氯离子渗透性能的影响规律。结果表明：萘系减水剂与纳米二氧化硅相容性更好，更有利于纳米二氧化硅在水悬浮体系中的均匀分散；随着纳米二氧化硅粒径减小或掺量的增加，水泥砂浆各龄期的抗压强度呈现先增大后减小的趋势，而抗氯离子渗透实验得到的6 h电通量则先减小后增大。纳米二氧化硅能够改善水泥砂浆的内部结构，增加结构的致密性，但粒径过小或掺量过高会因分散性变差而导致力学强度与密实性下降。
关键词：纳米二氧化硅；水泥砂浆；抗压强度；密实度
Abstract：Nano-silica particles in different size were used to partially replace silica fume in the optimized mixing ratio of impermeable concrete. Detailed investigations were carried out to reveal the contribution of the particle size and content of nano-silica on the compressive strength and chloride ion penetration resistance of the as-prepared cement mortar. The results show that the naphthalene-based water reducing agent has better compatibility with nano-silica to realize the uniform dispersion of nano-silica in water-based suspension systems. As the particle size of nano-silica decreases or the amount increases, the compressive strength of cement mortar at each age shows a trend of first increasing and then decreasing, while the 6 h electric flux obtained from the anti-chloride ion penetration measurement first decreases and then increase. Nano-silica can improve the internal structure of cement mortar and increase the compactness of the structure. However, if the particle size is too small or the content is too high, the performance of cement mortar decrease apparently due to the poor dispersion of silica nanoparticles.
Keywords：nano-silica; cement mortar; compressive strength; compactness
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