DEM study on the effect of the coarse aggregate shape and content on the flow performance of fresh concrete.
Saved in:
| Title: | DEM study on the effect of the coarse aggregate shape and content on the flow performance of fresh concrete. |
|---|---|
| Authors: | Deng, Rong1 (AUTHOR) dengrong20@163.com, Luo, Yufeng1 (AUTHOR), Li, Sizhong2 (AUTHOR) |
| Source: | Particulate Science & Technology. 2025, Vol. 43 Issue 4, p637-650. 14p. |
| Subjects: | Discrete element method, Concrete testing, Flow velocity, Surface energy, Surface area |
| Abstract: | In this paper, the effect of the coarse aggregate (CA) shape and content on the flow performance index of fresh concrete in the L-box test (Bm) was investigated based on Discrete Element Method (DEM). The Hertz-Mindlin-JKR (Johnson-Kendall-Roberts) contact model was used to characterize the constitutive relationships of fresh concrete. The parameters of contact model were calibrated by the experiment and simulation of the slump test, L-box flow test and V-funnel test. The shape of CA was quantitatively characterized, and a functional relationship between the specific surface area of concrete (SC) and surface energy was established. The effect of CA shape and content on Bm was studied numerically. The simulated results of single-shape CA concrete in L-box test show that the shape of CA affects the resultant force and flow velocity of the tracked concrete in the x direction, thus affecting the Bm. The smaller the sphericity index of CA, the larger the specific surface area and the smaller the Bm. The results of orthogonal tests show that the CA content of different shape in concrete affects Bm with different degree. The larger the specific surface area of coarse aggregate (SCA), the greater the negative effect on Bm. A linear relationship between SC and Bm was established. An equation for predicting Bm based on shapes and contents of CA was presented. It shows that the more complex the shape of CA and the higher its content, the smaller the Bm. [ABSTRACT FROM AUTHOR] |
| Copyright of Particulate Science & Technology is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
|
Full text is not displayed to guests.
Login for full access.
|
|
| Abstract: | In this paper, the effect of the coarse aggregate (CA) shape and content on the flow performance index of fresh concrete in the L-box test (Bm) was investigated based on Discrete Element Method (DEM). The Hertz-Mindlin-JKR (Johnson-Kendall-Roberts) contact model was used to characterize the constitutive relationships of fresh concrete. The parameters of contact model were calibrated by the experiment and simulation of the slump test, L-box flow test and V-funnel test. The shape of CA was quantitatively characterized, and a functional relationship between the specific surface area of concrete (SC) and surface energy was established. The effect of CA shape and content on Bm was studied numerically. The simulated results of single-shape CA concrete in L-box test show that the shape of CA affects the resultant force and flow velocity of the tracked concrete in the x direction, thus affecting the Bm. The smaller the sphericity index of CA, the larger the specific surface area and the smaller the Bm. The results of orthogonal tests show that the CA content of different shape in concrete affects Bm with different degree. The larger the specific surface area of coarse aggregate (SCA), the greater the negative effect on Bm. A linear relationship between SC and Bm was established. An equation for predicting Bm based on shapes and contents of CA was presented. It shows that the more complex the shape of CA and the higher its content, the smaller the Bm. [ABSTRACT FROM AUTHOR] |
|---|---|
| ISSN: | 02726351 |
| DOI: | 10.1080/02726351.2025.2481583 |
