Multifield coupling study on random aggregate concrete under microwave irradiation

2022 ◽  
Vol 318 ◽  
pp. 126025
Author(s):  
Pengju Zhang ◽  
Wei Wei ◽  
Zhushan Shao
2009 ◽  
Vol 417-418 ◽  
pp. 689-692 ◽  
Author(s):  
Jian Zhuang Xiao ◽  
Qiong Liu ◽  
Vivian W.Y. Tam

A random aggregate model of recycled aggregate concrete is developed in this paper on the base of a mixture ratio. Combining a lattice model with random aggregate of recycled aggregate concrete, lattice elements in the lattice model of recycled aggregate concrete can be classified into five types: (1) nature aggregate, (2) old hardened mortar, (3) new hardened mortar, (4) old interface transition zone (ITZ), and (5) new ITZ. The fundamental mechanical parameters of the lattice elements are chosen from the authors’ test as well as other references. A FORTRAN program of the lattice model is then written with basic theories of finite element method (FEM) for simulating the meso-structural damage of recycled aggregate concrete under uniaxial compression.


2011 ◽  
Vol 179-180 ◽  
pp. 79-85
Author(s):  
Huai Liang Wang

Based on the fundamental test data and the mesoscopic approach, a rigid body spring model is developed for simulation of the behavior of large aggregate concrete subjected to uniaxial or multiaxial load. Firstly, the concrete is treated as a three-phase inhomogeneous system; random aggregate model for fully-graded concrete is used to form the aggregate distribution. Then, based on the rigid body spring discrete element model, a procedure for mesoscopic study behaviour of large aggregate concrete under the two-dimensional stress state is given. At last, the comparison of numerical and experimental results shows that this method could effectively describe the failure behavior of large aggregate concrete under various plane stress state.


2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Yijiang Peng ◽  
Yinghua Liu ◽  
Jiwei Pu ◽  
Lijuan Zhang

The base force element method (BFEM) on potential energy principle is used to analyze recycled aggregate concrete (RAC) on mesolevel. The model of BFEM with triangular element is derived. The recycled aggregate concrete is taken as five-phase composites consisting of natural coarse aggregate, new mortar, new interfacial transition zone (ITZ), old mortar, and old ITZ on meso-level. The random aggregate model is used to simulate the mesostructure of recycled aggregate concrete. The mechanics properties of uniaxial compression and tension tests for RAC are simulated using the BFEM, respectively. The simulation results agree with the test results. This research method is a new way for investigating fracture mechanism and numerical simulation of mechanics properties for recycled aggregate concrete.


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