为解决传统水泥净浆流动扩展过程表征存在的数据处理依赖人工、操作繁琐和耗时较长等不足,提出了一种基于计算机视觉的流动扩展过程高精度表征方法。以Segment Anything Model 2(SAM2)为核心,采用You Only Look Once v11(YOLOv11)模型...为解决传统水泥净浆流动扩展过程表征存在的数据处理依赖人工、操作繁琐和耗时较长等不足,提出了一种基于计算机视觉的流动扩展过程高精度表征方法。以Segment Anything Model 2(SAM2)为核心,采用You Only Look Once v11(YOLOv11)模型确定提示点,通过透视变换与光线折射的双重几何校正方法降低误差。结果表明,计算的最终扩展度与试验结果高度一致(平均绝对误差<1 mm),同时能够获取扩展度、速率随时间变化的曲线。对这些动态过程信息的分析,有助于更加全面地表征净浆的流动行为,为反演净浆的流变性能提供了数据基础。展开更多
In plain mortar,the water film thickness(WFT)has been found to play a key role in the fresh properties.However,in fiber-reinforced mortar,the role of WFT has not been investigated yet.In this research,basalt fibers of...In plain mortar,the water film thickness(WFT)has been found to play a key role in the fresh properties.However,in fiber-reinforced mortar,the role of WFT has not been investigated yet.In this research,basalt fibers of different lengths were added to the mortar,and the dynamic and static flowability,cohesiveness,adhesiveness,and packing density were tested to study the effects of fiber length on the packing density and WFT,and the combined effects of fiber length and WFT on the fresh properties.The results showed that in fiber-reinforced mortar,the WFT also plays a key role,whereas the fiber length exerts its influences through the indirect effects on the packing density and WFT and the direct effect on fiber-mortar interaction.Basically,an increase in fiber length decreases the packing density and WFT,decreases the dynamic and static flowability needed for placing,increases the cohesiveness needed for avoiding segregation,and,quite unexpectedly,decreases the adhesiveness needed for rendering and spraying applications.Regression analysis yielded good correlation of the fresh properties to fiber length and WFT,and best-fit formulas for the mix design for basalt fiber-reinforced mortar were obtained.展开更多
文摘为解决传统水泥净浆流动扩展过程表征存在的数据处理依赖人工、操作繁琐和耗时较长等不足,提出了一种基于计算机视觉的流动扩展过程高精度表征方法。以Segment Anything Model 2(SAM2)为核心,采用You Only Look Once v11(YOLOv11)模型确定提示点,通过透视变换与光线折射的双重几何校正方法降低误差。结果表明,计算的最终扩展度与试验结果高度一致(平均绝对误差<1 mm),同时能够获取扩展度、速率随时间变化的曲线。对这些动态过程信息的分析,有助于更加全面地表征净浆的流动行为,为反演净浆的流变性能提供了数据基础。
基金Project supported by the National Natural Science Foundation of China(Nos.51608131 and 51808134)the European Regional Development Fund(No.01.2.2-LMT-K-718-03-0010)under grant agreement with the Research Council of Lithuania(LMTLT)+3 种基金the Marie Skłodowska-Curie Actions of the European Commission(No.751461)the Colleges Innovation Project of Guangdong Province(No.2017KTSCX061)the Pearl River S&T Nova Program of Guangzhou City(No.201906010064)the Natural Science Foundation of Guangdong Province(No.2021A1515011747),China。
文摘In plain mortar,the water film thickness(WFT)has been found to play a key role in the fresh properties.However,in fiber-reinforced mortar,the role of WFT has not been investigated yet.In this research,basalt fibers of different lengths were added to the mortar,and the dynamic and static flowability,cohesiveness,adhesiveness,and packing density were tested to study the effects of fiber length on the packing density and WFT,and the combined effects of fiber length and WFT on the fresh properties.The results showed that in fiber-reinforced mortar,the WFT also plays a key role,whereas the fiber length exerts its influences through the indirect effects on the packing density and WFT and the direct effect on fiber-mortar interaction.Basically,an increase in fiber length decreases the packing density and WFT,decreases the dynamic and static flowability needed for placing,increases the cohesiveness needed for avoiding segregation,and,quite unexpectedly,decreases the adhesiveness needed for rendering and spraying applications.Regression analysis yielded good correlation of the fresh properties to fiber length and WFT,and best-fit formulas for the mix design for basalt fiber-reinforced mortar were obtained.
