CAJ | 학술논문

为了研究高延性水泥基复合材料（HDCC）流变特性对短切聚乙烯醇（PVA）纤维分散性的影响规律，采用流变仪和荧光显微分析技术分别对HDCC浆体的流变特性以及短切PVA纤维在HDC C基体中的分散性进行研究．实验结果表明：HDC C浆体流变行为符合赫切尔巴尔克模型，浆体流动后，应变梯度随应力增量按幂指数增长；当HDCC浆体塑性黏度为1.3～7.3 Pa·s时，即使短切PVA纤维的体积掺量为1.5％～2.0％，纤维在HDCC 基体中的分散系数均大于0.92，实现了均匀分散．合理调整配比中粉煤灰、减水剂和功能性组分的掺量，可调控HDCC浆体塑性黏度并实现短切PVA纤维的均匀分散，为HDCC高延性的理论设计提供实验支持．
위료연구고연성수니기복합재료（HDCC）류변특성대단절취을희순（PVA）섬유분산성적영향규률，채용류변의화형광현미분석기술분별대HDCC장체적류변특성이급단절PVA섬유재HDC C기체중적분산성진행연구．실험결과표명：HDC C장체류변행위부합혁절이파이극모형，장체류동후，응변제도수응력증량안멱지수증장；당HDCC장체소성점도위1.3～7.3 Pa·s시，즉사단절PVA섬유적체적참량위1.5％～2.0％，섬유재HDCC 기체중적분산계수균대우0.92，실현료균균분산．합리조정배비중분매회、감수제화공능성조분적참량，가조공HDCC장체소성점도병실현단절PVA섬유적균균분산，위HDCC고연성적이론설계제공실험지지．
In order to investigate the influence of rheological property of high ductility cementitious composites (HDCC)on the dispersion of domestic short polyvinyl alcohol (PVA)fiber,rheometer and fluorescence microscopy technology are used to study the rheological properties of HDCC and the fiber dispersion of PVA fiber in HDCC,respectively.The experimental results reveal that the rheological behavior of HDCC slurry conforms to the Herschel-Bulkley model,in which the shear strain rate exponentially increases with the increment of the shear stress after flowing.Furthermore, when the plastic viscosity of HDCC slurry is around 1.3 to 7.3 Pa·s,even though the volume dos-age of short PVA fiber is 1.5% to 2.0%,the dispersion coefficient is also more than 0.92.Thus, the short PVA fiber is dispersed in the HDCC matrix homogenously.Therefore,by reasonably regu-lating the content of fly ash,superplasticizer and functional components,plastic viscosity of HDCC mortar can be controlled and homogeneous distribution of PVA fibers can be achieved,which pro-vides an experimental support for high ductility design of HDCC.