中文摘要：

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%。

英文摘要：

To clarify the dispersive characterization of fibers in polyvinyl alcohol （PVA） fiber cement composites, the fluorescence characteristics and image of PVA fibers in the PVA fiber cement composites were determined by fluorescence spectrometer and fluorescence microscope coupled with image-processing software, respectively. The influences of mixing method, aspect ratio and volume fraction of fibers and dispersing agent on the dispersion of PVA fibers were investigated. The experimental results show that the optimum wavelength ranges of excitation and emission wave of PVA fibers are 415-460 nm and 480-540 nm, respectively. Thus, a green fluorescent protein （GFP） filter can be chosen for fluorescence image analysis. Also, the dispersion of PVA fibers was quantitatively evaluated by the distribution coefficient and effective utilization percentage in the fluorescence microscopy technique based on fluorescence image analysis. Compared to the control sample in the absence of a dispersing agent, the effective utilization percentage of fibers with 12 mm length, 27μm diameter and 0.3% volume fraction in the PVA fiber cement composites in the presence of a dispersing agent after the synchronous mixing for 6 min is increased by 32.9%.