Fracture behavior of SAP concrete under the interaction of fatigue load and extreme environments based on acoustic emission
Superabsorbent polymers (SAPs) enhance concrete durability by mitigating early cracks and promoting secondary hydration; however, their enhancement effect may be influenced by extreme environments (e.g., high/low temperature, and freeze–thaw cycles) and varying fatigue load levels (0.4, 0.55, and 0....
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Elsevier
2025-09-01
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| Series: | Results in Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590123025024466 |
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| author | Guiping Ren Yinchuan Guo Aiqin Shen Hansong Wu Zhenghua Lyu Hongxu Cui Jinhua Wu |
| author_facet | Guiping Ren Yinchuan Guo Aiqin Shen Hansong Wu Zhenghua Lyu Hongxu Cui Jinhua Wu |
| author_sort | Guiping Ren |
| collection | DOAJ |
| description | Superabsorbent polymers (SAPs) enhance concrete durability by mitigating early cracks and promoting secondary hydration; however, their enhancement effect may be influenced by extreme environments (e.g., high/low temperature, and freeze–thaw cycles) and varying fatigue load levels (0.4, 0.55, and 0.7). A four-point bending fracture test combined with acoustic emission (AE) technology was used to assess the fracture behavior of SAP concrete under the interaction of environmental and dynamic fatigue loading. Additionally, scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) were used to examine crack evolution mechanisms. The results demonstrated that SAPs slow the rate of decline in flexural tensile strength, peak load, and fracture energy under varying fatigue load durations and temperature fields. Specifically, under 0.55 stress-level fatigue load and temperature environments, the fracture energies of the control group decreased by 42.86 %–87.75 %, while those of SAP concrete decreased by only 35.96 %–85.51 %. The impact of environmental factors on concrete can be ranked in the following order: freeze–thaw cycles, high temperature, and low temperature. Moreover, the anti-cracking performance of SAP concrete is more pronounced at low temperatures than at high temperatures. Mechanistically, SAPs optimized the pore structure and enhanced concrete compactness through internal curing, reducing the average pore diameter of the concrete by 12.25 %. This also decreased crack length, width, and density, as the incorporation of SAPs increased the initial damage threshold and inhibited crack propagation. This research provides a theoretical foundation and technical support for the application of SAP concrete in highway engineering. |
| format | Article |
| id | doaj-art-47be6cb5c969445bbcdb6a0e584fda9b |
| institution | Kabale University |
| issn | 2590-1230 |
| language | English |
| publishDate | 2025-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Engineering |
| spelling | doaj-art-47be6cb5c969445bbcdb6a0e584fda9b2025-08-20T03:35:44ZengElsevierResults in Engineering2590-12302025-09-012710637510.1016/j.rineng.2025.106375Fracture behavior of SAP concrete under the interaction of fatigue load and extreme environments based on acoustic emissionGuiping Ren0Yinchuan Guo1Aiqin Shen2Hansong Wu3Zhenghua Lyu4Hongxu Cui5Jinhua Wu6School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; Corresponding authors.School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; Corresponding authors.School of Highway, Chang’an University, Xi’an 710064, Shaanxi, ChinaBeijing Key Laboratory of Traffic Engineering, Beijing University of Technology, Beijing 100124, ChinaCollege of Ocean Engineering and Energy, Guangdong Ocean University, Zhanjiang, Guangdong 524088, China; Corresponding authors.Shandong Highway Infrastructure Co., Ltd., Shandong Hi-Speed Group Co., Ltd., Jinan 250000, ChinaSchool of Highway, Chang’an University, Xi’an 710064, Shaanxi, ChinaSuperabsorbent polymers (SAPs) enhance concrete durability by mitigating early cracks and promoting secondary hydration; however, their enhancement effect may be influenced by extreme environments (e.g., high/low temperature, and freeze–thaw cycles) and varying fatigue load levels (0.4, 0.55, and 0.7). A four-point bending fracture test combined with acoustic emission (AE) technology was used to assess the fracture behavior of SAP concrete under the interaction of environmental and dynamic fatigue loading. Additionally, scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) were used to examine crack evolution mechanisms. The results demonstrated that SAPs slow the rate of decline in flexural tensile strength, peak load, and fracture energy under varying fatigue load durations and temperature fields. Specifically, under 0.55 stress-level fatigue load and temperature environments, the fracture energies of the control group decreased by 42.86 %–87.75 %, while those of SAP concrete decreased by only 35.96 %–85.51 %. The impact of environmental factors on concrete can be ranked in the following order: freeze–thaw cycles, high temperature, and low temperature. Moreover, the anti-cracking performance of SAP concrete is more pronounced at low temperatures than at high temperatures. Mechanistically, SAPs optimized the pore structure and enhanced concrete compactness through internal curing, reducing the average pore diameter of the concrete by 12.25 %. This also decreased crack length, width, and density, as the incorporation of SAPs increased the initial damage threshold and inhibited crack propagation. This research provides a theoretical foundation and technical support for the application of SAP concrete in highway engineering.http://www.sciencedirect.com/science/article/pii/S2590123025024466Acoustic emissionFracture characteristicSAP concreteFatigue load and temperature interaction |
| spellingShingle | Guiping Ren Yinchuan Guo Aiqin Shen Hansong Wu Zhenghua Lyu Hongxu Cui Jinhua Wu Fracture behavior of SAP concrete under the interaction of fatigue load and extreme environments based on acoustic emission Results in Engineering Acoustic emission Fracture characteristic SAP concrete Fatigue load and temperature interaction |
| title | Fracture behavior of SAP concrete under the interaction of fatigue load and extreme environments based on acoustic emission |
| title_full | Fracture behavior of SAP concrete under the interaction of fatigue load and extreme environments based on acoustic emission |
| title_fullStr | Fracture behavior of SAP concrete under the interaction of fatigue load and extreme environments based on acoustic emission |
| title_full_unstemmed | Fracture behavior of SAP concrete under the interaction of fatigue load and extreme environments based on acoustic emission |
| title_short | Fracture behavior of SAP concrete under the interaction of fatigue load and extreme environments based on acoustic emission |
| title_sort | fracture behavior of sap concrete under the interaction of fatigue load and extreme environments based on acoustic emission |
| topic | Acoustic emission Fracture characteristic SAP concrete Fatigue load and temperature interaction |
| url | http://www.sciencedirect.com/science/article/pii/S2590123025024466 |
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