Stress Distribution in Microregion of Core–Shell Structure Lightweight Aggregate Concrete
Abstract
:1. Introduction
2. Modeling and Simulation
2.1. Experimental Basis of Model Establishment
2.2. Methodology
2.3. Material Parameters
3. Results and Discussion
3.1. Influences of Characteristics of CSLWA on Stress Distribution in Microregion of LWAC
3.1.1. Components of the Core
3.1.2. Core–Shell Thickness Ratio
3.1.3. Core–Shell Interfacial Bonding Zone
3.2. Influences of ITZ Properties on Stress Distribution in Microregion of LWAC
3.2.1. Equivalent Treatment of ITZ
3.2.2. Variation of Microregion Stress Distribution
4. Conclusions
- (1)
- The mineral composition of the core significantly influences the stress distribution in the microregion close to the shell of core–shell structure LWAC. Under the condition of constant porosity, when the content of high-modulus components increases, the minimum stress location in the model is gradually transferred from the core–shell interface to the interface between the shell and cement matrix. Moreover, the stress difference between the core and shell is intensified, which increases the possibility of nucleation and the propagation of microcracks at the interface.
- (2)
- The core–shell thickness ratio primarily affects CSLWA stress distribution on the shell. With the increase of core–shell thickness ratio, the stress difference on the shell increases, and the more uneven stress distribution likely leads to the nucleation and extension of microcracks on the shell. Furthermore, IBZ can reduce the stress difference of the core–shell interface and can delay the local failure in LWAC.
- (3)
- Compared to the ordinary LWAC of the same grade, the stress distribution in the microregion close to the shell of the core–shell structure LWAC is more uniform. Moreover, an increase in the hydration age generates similar effects. These findings demonstrate that the CSLWA acts as a potential candidate to improve the failure resistance of LWAC.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Density (g cm−3) | Young’s Modulus (GPa) | Poisson’s Ratio | |
---|---|---|---|
Cordierite | 2.30 | 125.0 | 0.26 |
Anorthite | 2.77 | 99.1 | 0.30 |
Unhydrated Particles | 135 | 0.27 | |
Hydration Products | 25.0 | 0.20 |
Cordierite Content (wt.%) | 100 | 80 | 60 | 40 | 20 | 0 |
---|---|---|---|---|---|---|
Young’s modulus (GPa) | 34.375 | 33.024 | 31.642 | 30.224 | 28.763 | 27.253 |
Poisson’s ratio | 0.26 | 0.27 | 0.27 | 0.28 | 0.29 | 0.3 |
Performance density (kg m−3) | 2.300 | 2.381 | 2.467 | 2.561 | 2.661 | 2.770 |
Hydration Age (Days) | 7 | 28 | 90 | 180 | |
---|---|---|---|---|---|
Cement Matrix | Young’s modulus (GPa) | 11.200 | 22.300 | 22.300 | 22.300 |
Poisson’s ratio | 0.33 | 0.25 | 0.25 | 0.25 | |
Belite Shell | Young’s modulus (GPa) | 23.655 | 23.682 | 23.965 | 23.964 |
Poisson’s ratio | 0.23 | 0.21 | 0.20 | 0.20 | |
ITZ of CSLWA | Young’s modulus (GPa) | 8.960 | 20.070 | 23.415 | 24.530 |
Poisson’s ratio | 0.264 | 0.28 | 0.280 | 0.30 | |
ITZ of ordinary light aggregate | Young’s modulus (GPa) | 8.765 | 18.349 | 21.408 | 22.541 |
Poisson’s ratio | 0.264 | 0.28 | 0.28 | 0.30 |
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Zhu, M.; Zhang, L.; Wang, W.; Zhang, H.; Xing, W. Stress Distribution in Microregion of Core–Shell Structure Lightweight Aggregate Concrete. Buildings 2021, 11, 540. https://doi.org/10.3390/buildings11110540
Zhu M, Zhang L, Wang W, Zhang H, Xing W. Stress Distribution in Microregion of Core–Shell Structure Lightweight Aggregate Concrete. Buildings. 2021; 11(11):540. https://doi.org/10.3390/buildings11110540
Chicago/Turabian StyleZhu, Meng, Lihua Zhang, Weilong Wang, Hongping Zhang, and Wenjin Xing. 2021. "Stress Distribution in Microregion of Core–Shell Structure Lightweight Aggregate Concrete" Buildings 11, no. 11: 540. https://doi.org/10.3390/buildings11110540