Evaluation of Mechanical Properties, Corrosion Resistance, and Pore Structure of Stepwise PCM Aggregate Concrete
Stepwise phase change material (PCM) aggregate concrete has advantages in controlling temperature and resisting frost heave, but its freeze–thaw resistance performance is still unclear. This paper explored the impact of replacing ordinary coarse aggregate with stepwise aggregate on the freeze–thaw r...
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| Format: | Article |
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MDPI AG
2023-12-01
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| Series: | Buildings |
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| Online Access: | https://www.mdpi.com/2075-5309/13/12/3076 |
| _version_ | 1797381759330942976 |
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| author | Bo Liu Sheliang Wang Wurong Jia Jiangsheng Xie Weiling Zhong Honghao Ying Zhe Lu |
| author_facet | Bo Liu Sheliang Wang Wurong Jia Jiangsheng Xie Weiling Zhong Honghao Ying Zhe Lu |
| author_sort | Bo Liu |
| collection | DOAJ |
| description | Stepwise phase change material (PCM) aggregate concrete has advantages in controlling temperature and resisting frost heave, but its freeze–thaw resistance performance is still unclear. This paper explored the impact of replacing ordinary coarse aggregate with stepwise aggregate on the freeze–thaw resistance characteristics of concrete. Firstly, the compressive strength, splitting tensile strength, and their relationship were evaluated. Then, the freeze–thaw resistance properties of PCM aggregate concrete were investigated, including macroscopic changes, mass loss, relative dynamic elasticity modulus loss, and compressive strength loss. Subsequently, the pore changes before and after freeze–thaw cycles were tested through non-destructive testing and nuclear magnetic resonance (NMR) testing, and the evolution of pores under freeze–thaw cycles was explored. The results show that adding 100% PCM aggregate reduces the strength of concrete by 32%. However, due to the high porosity in the 100% PCM aggregate concrete, it would have an adverse impact on corrosion resistance. The corrosion resistance of concrete increases firstly and then decreases with the addition of PCM aggregate, which can be attributed to PCM aggregate having a limiting effect on pore development. Overall, a substitution rate of 60% is acceptable for compressive strength and corrosion resistance. |
| first_indexed | 2024-03-08T20:56:07Z |
| format | Article |
| id | doaj.art-cfd15bab30a24793a583831bc2b300ea |
| institution | Directory Open Access Journal |
| issn | 2075-5309 |
| language | English |
| last_indexed | 2024-03-08T20:56:07Z |
| publishDate | 2023-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Buildings |
| spelling | doaj.art-cfd15bab30a24793a583831bc2b300ea2023-12-22T13:58:24ZengMDPI AGBuildings2075-53092023-12-011312307610.3390/buildings13123076Evaluation of Mechanical Properties, Corrosion Resistance, and Pore Structure of Stepwise PCM Aggregate ConcreteBo Liu0Sheliang Wang1Wurong Jia2Jiangsheng Xie3Weiling Zhong4Honghao Ying5Zhe Lu6China Railway 20th Bureau Group Co., Ltd., Xi’an 710016, ChinaSchool of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, ChinaChina Railway 20th Bureau Group Co., Ltd., Xi’an 710016, ChinaChina Railway 20th Bureau Group Co., Ltd., Xi’an 710016, ChinaChina Railway 20th Bureau Group Co., Ltd., Xi’an 710016, ChinaSchool of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, ChinaSchool of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, ChinaStepwise phase change material (PCM) aggregate concrete has advantages in controlling temperature and resisting frost heave, but its freeze–thaw resistance performance is still unclear. This paper explored the impact of replacing ordinary coarse aggregate with stepwise aggregate on the freeze–thaw resistance characteristics of concrete. Firstly, the compressive strength, splitting tensile strength, and their relationship were evaluated. Then, the freeze–thaw resistance properties of PCM aggregate concrete were investigated, including macroscopic changes, mass loss, relative dynamic elasticity modulus loss, and compressive strength loss. Subsequently, the pore changes before and after freeze–thaw cycles were tested through non-destructive testing and nuclear magnetic resonance (NMR) testing, and the evolution of pores under freeze–thaw cycles was explored. The results show that adding 100% PCM aggregate reduces the strength of concrete by 32%. However, due to the high porosity in the 100% PCM aggregate concrete, it would have an adverse impact on corrosion resistance. The corrosion resistance of concrete increases firstly and then decreases with the addition of PCM aggregate, which can be attributed to PCM aggregate having a limiting effect on pore development. Overall, a substitution rate of 60% is acceptable for compressive strength and corrosion resistance.https://www.mdpi.com/2075-5309/13/12/3076PCM aggregatestepwisenon-destructive testpore evolutionreplacement ratio |
| spellingShingle | Bo Liu Sheliang Wang Wurong Jia Jiangsheng Xie Weiling Zhong Honghao Ying Zhe Lu Evaluation of Mechanical Properties, Corrosion Resistance, and Pore Structure of Stepwise PCM Aggregate Concrete Buildings PCM aggregate stepwise non-destructive test pore evolution replacement ratio |
| title | Evaluation of Mechanical Properties, Corrosion Resistance, and Pore Structure of Stepwise PCM Aggregate Concrete |
| title_full | Evaluation of Mechanical Properties, Corrosion Resistance, and Pore Structure of Stepwise PCM Aggregate Concrete |
| title_fullStr | Evaluation of Mechanical Properties, Corrosion Resistance, and Pore Structure of Stepwise PCM Aggregate Concrete |
| title_full_unstemmed | Evaluation of Mechanical Properties, Corrosion Resistance, and Pore Structure of Stepwise PCM Aggregate Concrete |
| title_short | Evaluation of Mechanical Properties, Corrosion Resistance, and Pore Structure of Stepwise PCM Aggregate Concrete |
| title_sort | evaluation of mechanical properties corrosion resistance and pore structure of stepwise pcm aggregate concrete |
| topic | PCM aggregate stepwise non-destructive test pore evolution replacement ratio |
| url | https://www.mdpi.com/2075-5309/13/12/3076 |
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