CN-122021047-A - Real recycled aggregate stacking simulation and concrete modeling method

CN122021047ACN 122021047 ACN122021047 ACN 122021047ACN-122021047-A

Abstract

The invention discloses a real recycled aggregate stacking simulation and concrete modeling method, which belongs to the field of building material digitization and computer simulation and comprises the steps of constructing a real recycled aggregate digitization model library with multiphase component labels, parametrically screening aggregates according to target mix proportion and performing grading scaling, establishing a parent-child assembly relation of a multiphase model, controlling aggregate spacing to digitally design mix proportion by setting adjustable collision margin parameters in physical simulation, sequentially performing free-fall simulation to generate a loose stacking state, compacting simulation to realize densification and strickling simulation to obtain a final flat surface, extracting each final compact stacking static model, counting volume, and quantitatively verifying design targets. The invention solves the problem that the traditional method can not truly reflect the form, multiphase composition and designable mixing ratio of the recycled aggregate, and provides a high-efficiency and accurate digital tool for material design and performance simulation of recycled concrete.

Inventors

XIAO JIANZHUANG
MEI JUNJIE
YANG HAIFENG
LIU HAORAN

Assignees

广西大学

Dates

Publication Date: 20260512
Application Date: 20260211

Claims (10)

1. The method for simulating the accumulation of the true recycled aggregate and modeling the concrete is characterized by comprising the following steps of: Constructing a three-dimensional model base of recycled aggregate containing natural aggregate and old mortar components based on computed tomography data, and endowing the model with a multi-dimensional attribute label; Screening aggregate from the model library according to the target morphological parameters and the old mortar duty ratio range, and synchronously scaling the selected aggregate, the natural aggregate thereof and the old mortar sub-model based on the target grading curve and the aggregate volume fraction to obtain an aggregate set conforming to the target particle size interval; arranging the scaled aggregate set in a target container space to form an initial arrangement model; Establishing physical properties for the recycled aggregate model and the container in the initial arrangement model, establishing a parent-child hierarchical relationship between the recycled aggregate model and the corresponding natural aggregate and old mortar sub-model, and setting adjustable collision margin parameters; Performing free falling physical simulation based on the physical attribute, the parent-child hierarchical relationship and the collision margin parameter to obtain a loose accumulation state; Applying vibration excitation to the loose accumulation state to perform densification physical simulation, and performing strickling operation on the vibrated state to obtain a dense accumulation state; And respectively extracting the final models in the loose stacking state and the dense stacking state, and counting the volumes of aggregates of all phases in the container so as to quantitatively verify the design target.
2. The method of claim 1, wherein constructing a three-dimensional model library of recycled aggregate comprising natural aggregate and old mortar components comprises: grid optimization is carried out on the original three-dimensional model obtained through scanning, and the morphological index and the old mortar volume ratio of the original three-dimensional model are calculated; and generating a multi-dimensional attribute label for each model based on the morphological index and the old mortar volume ratio so as to establish a parameterized query digital aggregate library.
3. The method of claim 2, wherein synchronously scaling the selected aggregate and its natural aggregate, old mortar submodel comprises: taking the shortest axis length obtained by principal component analysis as a characteristic length, and calculating a scaling ratio required for scaling the model to a target particle size interval; based on the same scaling center, scaling the selected recycled aggregate model and the related natural aggregate and old mortar sub-model in equal proportion according to the scaling proportion so as to keep the volume ratio of each component before and after scaling unchanged.
4. The method of claim 1, wherein disposing the scaled aggregate set within a target container space comprises: generating multiple throwing sequence schemes for aggregates with different particle sizes based on a greedy algorithm and a cyclic throwing strategy; and calculating the comprehensive scores of the candidate positions in each delivery scheme, and selecting the scheme with the highest score to arrange the aggregate in the target container so as to obtain an initial arrangement model with high space utilization rate.
5. The method according to claim 1, wherein the establishing of the parent-child hierarchical relationship between the recycled aggregate model and the corresponding natural aggregate, old mortar child model is specifically: Setting the natural aggregate and old mortar child model as child objects of the recycled aggregate model, so that only the recycled aggregate model participates in dynamic calculation as a movable rigid body in subsequent physical simulation, and the child objects move along with a father object.
6. The method of claim 1, wherein setting an adjustable collision margin parameter comprises: The method comprises the steps of independently setting a first collision margin and a second collision margin, wherein the first collision margin is used for controlling the aggregate particle spacing between the movable rigid bodies, and the second collision margin is used for controlling the spacing between the movable rigid bodies and a container or a tool.
7. The method of claim 1, wherein performing a free-fall physical simulation comprises: The regenerated aggregate model is endowed with movable rigid body attribute influenced by gravity, and the container is endowed with static or kinematic rigid body attribute; And calling a physical engine to simulate the process that aggregate falls into the container under the action of gravity and reaches balance through collision.
8. The method of claim 1, wherein applying vibratory excitation to the loosely packed state for densification physical simulation comprises: Setting the container as a kinematic rigid body and enabling the container to move along a plurality of directions according to a preset simple harmonic vibration rule; And (3) running the physical simulation again in a vibration environment, so that the aggregate is redistributed under the vibration effect and reaches a more compact balance state.
9. An electronic device comprising a memory, a processor and a computing program stored in the memory and executable on the processor, characterized in that the processor implements the method of any of claims 1-8 when executing the computing program.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the method of any of claims 1-8.

Description

Real recycled aggregate stacking simulation and concrete modeling method Technical Field The invention belongs to the field of building material digitization and computer simulation, and particularly relates to a real recycled aggregate stacking simulation and concrete modeling method. Background Recycled concrete is an important sustainable building material, and the mechanical and durability properties of recycled concrete are greatly dependent on the complex characteristics of the recycled aggregate and the spatial distribution state of the recycled aggregate in a concrete matrix. In the field of numerical simulation, in order to predict concrete properties, it is often necessary to construct a digital model that reflects its microscopic structure. At present, the related modeling method mainly comprises two types, namely a random throwing algorithm based on a regular geometrical body (such as a sphere, an ellipsoid or a polyhedron), wherein the method is simple to realize but seriously ignores the irregular and multi-angular shapes of real recycled aggregate and the double-phase heterogeneous characteristics of the inside of the real recycled aggregate, which are formed by natural aggregate and attached old mortar, and a method for reconstructing the three-dimensional shape of the real aggregate based on CT scanning images, wherein the method is mainly used for improving the shape authenticity, but the processing objects are mostly homogeneous materials, and engineering parameters such as physical state, grading design, proportion control and the like are disjointed in the modeling process, the process is solidified, and flexible parametric design and multi-working condition batch generation are difficult to realize. However, the prior art still has obvious limitations that firstly, in the aspect of model authenticity, the external complex geometric form of recycled aggregate and the internal natural aggregate-old mortar multiphase composition cannot be simultaneously and accurately represented, so that the essence difference exists between a microscopic model and a real material, secondly, in the aspect of model designability, an automatic process for carrying out whole-course parameterization linkage control on aggregate screening, scaling, spatial layout and stacking compactness starting from a target blending ratio and grading curve is lacking, and particularly, the blending ratio of concrete cannot be directly and digitally designed and verified through adjusting simulation parameters, thirdly, in the aspect of model state integrity, the existing method only can generate a single static stacking model, and the states of different process stages such as typical loose stacking and compact stacking after compaction in construction are difficult to simulate and compare. These deficiencies limit the application of numerical models in the fine design and performance high-fidelity simulation of recycled concrete materials. Disclosure of Invention In order to solve the technical problems, the invention provides a method for simulating accumulation of true recycled aggregate and modeling concrete, which comprises the following steps: Constructing a three-dimensional model base of recycled aggregate containing natural aggregate and old mortar components based on computed tomography data, and endowing the model with a multi-dimensional attribute label; Screening aggregate from the model library according to the target morphological parameters and the old mortar duty ratio range, and synchronously scaling the selected aggregate, the natural aggregate thereof and the old mortar sub-model based on the target grading curve and the aggregate volume fraction to obtain an aggregate set conforming to the target particle size interval; arranging the scaled aggregate set in a target container space to form an initial arrangement model; Establishing physical properties for the recycled aggregate model and the container in the initial arrangement model, establishing a parent-child hierarchical relationship between the recycled aggregate model and the corresponding natural aggregate and old mortar sub-model, and setting adjustable collision margin parameters; Performing free falling physical simulation based on the physical attribute, the parent-child hierarchical relationship and the collision margin parameter to obtain a loose accumulation state; Applying vibration excitation to the loose accumulation state to perform densification physical simulation, and performing strickling operation on the vibrated state to obtain a dense accumulation state; And respectively extracting the final models in the loose stacking state and the dense stacking state, and counting the volumes of aggregates of all phases in the container so as to quantitatively verify the design target. Optionally, constructing the recycled aggregate three-dimensional model library comprising natural aggregate and old mortar components comprises: grid optimi