| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Research on the Difference of Coarse Aggregate Morphology Characteristics and Its Relationship with Stacking Voidage |
| LI Changzhi1, ZHOU Xinbin2, WEI Shigong3, MA Kunlin1,*, YU Lianshan4, ZOU Weidong4
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1 School of Civil Engineering, Central South University, Changsha 410075, China
2 Hunan Zhitong Expressway Construction and Development Co., Ltd., Huaihua 418000, Hunan, China
3 China Railway First Group No.5 Engineering Co., Ltd., Baoji 721004, Shaanxi, China
4 China Railway 21st Bureau Group No.6 Engineering Co., Ltd., Beijing 100000, China |
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Abstract The morphology of coarse aggregate directly affects its packing state, thus affecting the performance of concrete. In order to accurately describe the morphology of aggregate, quantify its characteristic difference, and reveal the relationship between aggregate morphology and voidage, digital image technology was used to analyze and calculate the coarse aggregate morphological parameters in this study. The morphology of coarse aggregate was accurately evaluated and classified by combining 2D and 3D morphological parameters. Meanwhile, the principal component analysis (PCA) was used to remove the overlap between morphological parameters, and the comprehensive influence of multiple morphological parameters on voidage was found out. The results show angularity (An), roundness (Rd) and sphericity (Sp) can well distinguish the morphology differences of coarse aggregate. Combined with flatness ratio (FR) and elongation ratio (ER), coarse aggregate can be further subdivided into four particle shapes:spherical, disc-like, strip-like and needle-like. The PCA results show that there is a significant correlation between the morphology characteristic parameters of coarse aggregate and the voidage, and the close packing weakens the influence of morphology characteristics on voidage. The Sp and An are the key morphology characteristics that affect the voidage. With the increase of Sp or the decrease of An, the voidage of coarse aggregate decrease, which should be controlled in the production and selection of coarse aggregate.
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Published: 10 September 2024
Online: 2024-09-30
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| Fund:Hunan Natural Science Foundation Project(2022JJ30732). |
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2024, Vol. 38 
