Analysis of the Effect of Pore Structure on the Mechanical Properties of Concrete Based on the Meso Numerical Model
In the research on the influence of pore structure on the macroscopic mechanical properties of concrete, the experimental method cannot realize the accurate control of the pore structure parameters, and the research based on the numerical simulation method is insufficient in the scientific simulatio...
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| Format: | Article |
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MDPI AG
2022-05-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/11/5428 |
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| author | Hao Yang Eryu Zhu Lei Liu |
| author_facet | Hao Yang Eryu Zhu Lei Liu |
| author_sort | Hao Yang |
| collection | DOAJ |
| description | In the research on the influence of pore structure on the macroscopic mechanical properties of concrete, the experimental method cannot realize the accurate control of the pore structure parameters, and the research based on the numerical simulation method is insufficient in the scientific simulation and parameterization of the complex pore structure. A new numerical concrete modeling method is proposed, which introduces the total porosity, pore gradation, pore size, and sub-porosity of each gradation segment to realize the accurate simulation and parameterization of the pore structure. Based on the control variable method, 25 concrete mesoscopic models with the same aggregate structure and different pore structures are established, and uniaxial tensile experiments are performed. The pore structure accelerates the process of damage expansion from the periphery to the center of the specimen and makes the damage inside the cement mortar more localized. There are obvious exponential function relationships of three pairs: total porosity and elastic modulus, PSSA and elastic modulus, and tensile strength and total porosity. There is an obvious quadratic polynomial function relationship between tensile strength and specific surface area. For specimens with the same aggregate structure and total porosity, the elastic modulus increases with the increase of the macropore content, and the tensile strength and elastic modulus are basically not affected by the average pore radius. The effect of pore space distribution and sub-porosity on peak strain is greater than that of total porosity, but no obvious regularity is shown. For pores with a radius in the range of 0.15–0.8 mm, the smaller the pores, the greater the effect of their porosity on the elastic modulus and tensile strength, and the less effect on the peak strain. |
| first_indexed | 2024-03-10T01:31:38Z |
| format | Article |
| id | doaj.art-6388718ae3564d14abec8713c160a263 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T01:31:38Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-6388718ae3564d14abec8713c160a2632023-11-23T13:41:30ZengMDPI AGApplied Sciences2076-34172022-05-011211542810.3390/app12115428Analysis of the Effect of Pore Structure on the Mechanical Properties of Concrete Based on the Meso Numerical ModelHao Yang0Eryu Zhu1Lei Liu2School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, ChinaSchool of Civil Engineering, Beijing Jiaotong University, Beijing 100044, ChinaSchool of Civil Engineering, Beijing Jiaotong University, Beijing 100044, ChinaIn the research on the influence of pore structure on the macroscopic mechanical properties of concrete, the experimental method cannot realize the accurate control of the pore structure parameters, and the research based on the numerical simulation method is insufficient in the scientific simulation and parameterization of the complex pore structure. A new numerical concrete modeling method is proposed, which introduces the total porosity, pore gradation, pore size, and sub-porosity of each gradation segment to realize the accurate simulation and parameterization of the pore structure. Based on the control variable method, 25 concrete mesoscopic models with the same aggregate structure and different pore structures are established, and uniaxial tensile experiments are performed. The pore structure accelerates the process of damage expansion from the periphery to the center of the specimen and makes the damage inside the cement mortar more localized. There are obvious exponential function relationships of three pairs: total porosity and elastic modulus, PSSA and elastic modulus, and tensile strength and total porosity. There is an obvious quadratic polynomial function relationship between tensile strength and specific surface area. For specimens with the same aggregate structure and total porosity, the elastic modulus increases with the increase of the macropore content, and the tensile strength and elastic modulus are basically not affected by the average pore radius. The effect of pore space distribution and sub-porosity on peak strain is greater than that of total porosity, but no obvious regularity is shown. For pores with a radius in the range of 0.15–0.8 mm, the smaller the pores, the greater the effect of their porosity on the elastic modulus and tensile strength, and the less effect on the peak strain.https://www.mdpi.com/2076-3417/12/11/5428pore structuremeso-concrete modeltensile elastic modulustensile strengthgrey relational analysis |
| spellingShingle | Hao Yang Eryu Zhu Lei Liu Analysis of the Effect of Pore Structure on the Mechanical Properties of Concrete Based on the Meso Numerical Model Applied Sciences pore structure meso-concrete model tensile elastic modulus tensile strength grey relational analysis |
| title | Analysis of the Effect of Pore Structure on the Mechanical Properties of Concrete Based on the Meso Numerical Model |
| title_full | Analysis of the Effect of Pore Structure on the Mechanical Properties of Concrete Based on the Meso Numerical Model |
| title_fullStr | Analysis of the Effect of Pore Structure on the Mechanical Properties of Concrete Based on the Meso Numerical Model |
| title_full_unstemmed | Analysis of the Effect of Pore Structure on the Mechanical Properties of Concrete Based on the Meso Numerical Model |
| title_short | Analysis of the Effect of Pore Structure on the Mechanical Properties of Concrete Based on the Meso Numerical Model |
| title_sort | analysis of the effect of pore structure on the mechanical properties of concrete based on the meso numerical model |
| topic | pore structure meso-concrete model tensile elastic modulus tensile strength grey relational analysis |
| url | https://www.mdpi.com/2076-3417/12/11/5428 |
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