硅酸盐通报2023，Vol.42Issue(12)：4216-4223,8.
基于核磁共振技术分析骨料粒径对水泥砂浆微观结构的影响
Study on Effect of Aggregate Particle Size on Microstructure of Cement Mortar Based on Nuclear Magnetic Resonance Technology
摘要
Abstract
In order to study the effect of aggregate particle size on the microstructure of cement mortar,the T2 spectra,nuclear magnetic resonance(NMR)imaging hard pulse one-dimensional frequency coding technique(GR sequence)and permeability of standard cylindrical cement mortar samples with aggregates of standard sand and mechanized sand(particle sizes of 1.25～2.50 mm,2.50～5.00 mm,and 5.00～10.00 mm,respectively)were measured by using a NMR device and the BRS-II impulse pore permeability detector.The effect of aggregate particle size on the pore size distribution,permeability,porosity,tortuosity,fractal characteristics of pore structure,and the uniformity of pore space distribution of cement mortar samples were investigated.The results show that the equivalent average pore radius and porosity of standard sand sample are the smallest.The equivalent average pore radius decreases first and then increases with the increase of aggregate particle size,while the aggregate particle size is negatively correlated with the tortuosity,and positively correlated with the permeability,porosity and fractal dimension of the capillary pores.In addition,with the increase of aggregate particle size,the unevenness of pore space distribution of sample increases significantly,and the aggregate particle size obviously affects the pore space distribution of cement mortar.关键词
水泥砂浆/微观结构/骨料粒径/渗透率/迂曲度/孔隙结构分形特征/孔隙空间分布均匀程度Key words
cement mortar/microstructure/aggregate particle size/permeability/tortuosity/fractal characteristic of pore structure/uniformity of pore space distribution分类
化学化工引用本文复制引用
李贤,宁麟,陈亮亮,李炀,邓小江..基于核磁共振技术分析骨料粒径对水泥砂浆微观结构的影响[J].硅酸盐通报,2023,42(12):4216-4223,8.基金项目
云南省科技厅重点研发计划(202103AA080013) （202103AA080013）
国家自然科学基金(52164001) （52164001）
