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为了建立聚乙烯醇(PVA)纤维在水泥基复合材料(FRCC)中的分散性表征技术和调控方法,采用荧光光谱仪和荧光显微镜+图像分析软件分别对PVA纤维的荧光特性及其在FRCC中的荧光图像进行获取和分析,再研究搅拌工艺、纤维长径比及体积掺量、分散剂对PVA纤维分散性的影响。结果表明:PVA纤维最佳激发和发射波长范围分别为415~460 nm及480~540 nm,荧光图像获取时应选择绿色荧光蛋白(GFP)滤波器;基于荧光图像分析,建立荧光分析技术,利用纤维分散系数和有效利用率两个评价指标对PVA纤维的分散性能进行定量表征;采用同掺法搅拌6 min后,再掺入分散剂可使PVA纤维(长度12 mm、直径27μm、体积掺量0.3%)在FRCC中的有效利用率较基准提高了32.9%。
In order to establish the dispersion characterization technique and regulation method of polyvinyl alcohol (PVA) fibers in cement-based composites (FRCC), the fluorescence characteristics of PVA fibers and their fluorescence in FRCC were analyzed by fluorescence spectroscopy and fluorescence microscope + image analysis software Fluorescence image acquisition and analysis, and then study the stirring process, fiber aspect ratio and volume content, dispersion of PVA fiber dispersion. The results showed that the optimum excitation and emission wavelength ranges of PVA fibers were 415-460 nm and 480-540 nm respectively. When obtaining fluorescence images, a green fluorescent protein (GFP) filter should be selected. Based on the fluorescence image analysis, a fluorescence analysis technique was established. Fiber dispersion coefficient and effective utilization rate of PVA fiber were quantitatively characterized. After mixing for 6 min, the PVA fiber (length 12 mm, diameter 27 μm, volumetric content 0.3%) increased the effective utilization rate in FRCC by 32.9% from the baseline.