A Particle Shape Evaluation Method for Natural Sand and Manufactured Sand Based on DIP
BIAN Libo
DING Linna
BIAN Jiapeng
LI Fei
BAI Zhiqiang
Abstract：The particle shape characteristics of natural sand and manufactured sand in the Beijing area were evaluated using digital image processing(DIP)technology,and a comprehensive evaluation index was established accordingly.The results indicate that natural sand outperforms manufactured sand in all five particle shape parameters,with the most significant difference observed in circularity.Mortar prepared with a 4∶6 mass ratio of natural sand to manufactured sand exhibits optimal performance in both workability and mechanical properties.The mortar demonstrates good water retention,a segregation degree of only 8 mm,a 28 d compressive strength of 25.1 MPa,and a flexural strength of 6.6 MPa.The reasonable blending ratio is effectively utilized with the"secondary skeleton"effect of manufactured sand and the shape and packing advantages of natural sand,thus the overall performance of the mortar is significantly enhanced.
Keywords：manufactured sandroundnessgradingdigital image processing technologyparticle shape evaluation parameter
Publication Date：2025-07-30
Online Publishing Date：2025-08-18(First online date of this platform, not the publication date of the document)
Pages：8( 693-700 )