Characterization of the shape and size of coarse aggregates by photogrammetry for the design of self-compacting concretes
Geometrical characteristics of coarse aggregates have a direct influence on the rheological properties of self-compacting concretes, with and without fiber reinforcement. In particular, their shape and size are related to their maximum particle packing fraction and their intrinsic viscosity. These p...
| Autores: | , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | RUIdeRA. Repositorio Institucional de la UCLM |
| OAI Identifier: | oai:ruidera.uclm.es:10578/47577 |
| Acceso en línea: | https://doi.org/10.1016/j.conbuildmat.2025.141013 https://hdl.handle.net/10578/47577 |
| Access Level: | acceso abierto |
| Palabra clave: | Aggregate morphology Concrete rheology Intrinsic viscosity Optical granulometry Particle packing fraction Photogrammetry Self-compacting concrete |
| Sumario: | Geometrical characteristics of coarse aggregates have a direct influence on the rheological properties of self-compacting concretes, with and without fiber reinforcement. In particular, their shape and size are related to their maximum particle packing fraction and their intrinsic viscosity. These parameters intervene in the analytical equation of Krieger and Dougherty, used to obtain the plastic viscosity of fresh concrete as a suspension of particles. However, traditional characterization methods of aggregates have limitations in providing the information necessary to determine them. In this article, photogrammetry is used to define with precision the main particle dimensions of three types of coarse aggregate. It is demonstrated how their morphological characterization can be done by a simple procedure of image processing of the orthophoto of a sample of the aggregates. The provided measurements make it possible to estimate the intrinsic viscosity through the circularity of particles. The results of the size distribution of their minor axis are found to reproduce the granulometric curve of the sieving method. These distributions are used to determine the maximum packing fraction for which, the approximation of different available empirical formulas are also discussed regarding the roundness or angularity of the aggregates. |
|---|