| Citation: |
NIU Hanyi, CHEN Bo, YUAN Zhiying. Freeze-thaw damage characteristics and evolution law of foam concrete based on acoustic emission-digital image correlation technique[J]. Acta Materiae Compositae Sinica, 2025, 42(5): 2728-2738. DOI: 10.13801/j.cnki.fhclxb.20240718.004
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To study the compression damage characteristics and damage evolution law of foam concrete under a freeze-thaw environment, a joint test combining uniaxial compression, acoustic emission (AE), and digital image correlation (DIC) technology was carried out on foam concrete with a density of 800 kg/m3. The strain evolution cloud diagram and acoustic emission parameter change characteristics of the foam concrete during the loading process were obtained. The results show that the compression damage process curve of foam concrete presents an obvious staged effect. The more freeze-thaw cycles the specimen experiences, the more pronounced the ductile damage characteristics become. With the increase in the number of freeze-thaw cycles, the area of the strain concentration zone of the specimen monitored by the DIC gradually increases, while the average value of the strain field gradually decreases. Meanwhile, the morphology of surface cracks in the specimen evolves from initial vertical single cracks to tilted shear-type multi-fractures. The proportion of shear cracks in the final damage of foam concrete specimens with 0, 20, 40, 60, and 80 freeze-thaw cycles are 52.5%, 57.8%, 59.2%, 65.3%, and 69.2%, respectively. The stages of decreasing acoustic emission b-value appear in 92.3%, 89.1%, 88.5%, 76.5%, and 72.3% of the loading process, respectively. The freeze-thaw environment can promote the transition from tensile to shear damage in foam concrete, exacerbates the internal damage of foam concrete, and thus induces large-scale rupture phenomena within the material. The results of AE and DIC complement each other, and their combination contributes to a comprehensive understanding of the developmental pattern of microcracks and damage mechanisms in foam concrete.
To study the compressive failure characteristics and damage evolution of foam concrete under freeze-thaw conditions, uniaxial compression-acoustic emission (AE)-digital image correlation (DIC) combined tests were conducted on foam concrete with a density of 800 kg/m. By analyzing the strain evolution cloud images and the variation characteristics of acoustic emission parameters of foam concrete, the combination of AE and DIC techniques allows for a multi-angle investigation of the damage evolution of foam concrete under freeze-thaw cycles. The research results can provide a certain reference for the performance evaluation of foam concrete and its application in cold regions.
By using DIC technology, the strain field on the surface of foam concrete material was recorded, thereby quantitatively analyzing the initiation and propagation process of cracks in real-time. Meanwhile, acoustic emission monitoring equipment was employed to collect acoustic emission characteristics during the uniaxial compression process of foam concrete after different freeze-thaw cycles. By analyzing multiple parameters such as cumulative ring count, RA-AF values, and b-values, the crack development in foam concrete after freeze-thaw cycles was studied comprehensively. This research provided an in-depth explanation and supplementation of the crack development and the mechanisms of freeze-thaw action on foam concrete.
Through uniaxial compression-acoustic emission (AE)-digital image correlation (DIC) combined tests, the strain evolution cloud images, AE ring count curves, RA-AF values, b-values, and other characteristic parameters of foam concrete after different freeze-thaw cycles were obtained. The results indicate:(1) Under freeze-thaw conditions, the compressive failure process curve of foam concrete shows a distinct stage effect. The more freeze-thaw cycles the specimen undergoes, the more pronounced the ductile failure characteristics and the faster the development of internal defects.(2) The DIC characteristics of the foam concrete compressive failure process show that with an increase in freeze-thaw cycles, the area of the strain concentration zone increases, the average strain field value gradually decreases, and the surface cracks develop from vertical through cracks to inclined shear-type multiple cracks. (3) The AE ring count during the compressive failure process of foam concrete under freeze-thaw conditions exhibits a three-stage variation: contact stage, calm stage, and sharp increase stage. The relative peak loads of foam concrete specimens after 0, 20, 40, 60, and 80 freeze-thaw cycles are 0.95, 0.90, 0.88, 0.84, and 0.75, respectively. The proportion of shear cracks at final failure are 52.5%, 57.8%, 59.2%, 65.3%, and 69.2%, respectively. The stages where the AE b-value decreases occur at 92.3%, 89.1%, 88.5%, 76.5%, and 72.3% of the loading process, respectively. The distribution of RA-AF values and b-values indicates that freeze-thaw conditions accelerate the transition of foam concrete from tensile failure to shear failure, causing large-scale cracking within the material earlier. (4) DIC technology plays a crucial role in analyzing the micro-crack evolution during the failure process of foam concrete specimens. Additionally, the AE and DIC results complement each other, and their combination helps to comprehensively understand the development of micro-cracks and the damage mechanisms of foam concrete under freeze-thaw conditions.Conclusions：Freeze-thaw cycles exacerbate the deterioration of foam concrete, causing the failure characteristics of the specimens to shift from brittle to ductile, with internal defects developing more rapidly. The area of the strain concentration zone increases, while the average strain field value gradually decreases, leading to a decline in mechanical properties and a decrease in the activity of acoustic emission (AE) signals. The AE ring count during the compressive failure process of foam concrete under freeze-thaw conditions exhibits a three-stage variation: contact stage, calm stage, and sharp increase stage. The relative peak loads of foam concrete specimens after 0 and 80 freeze-thaw cycles are 0.95 and 0.75, respectively, with the proportion of shear cracks at final failure being 52.5% and 69.2%, respectively. This indicates that freeze-thaw conditions can accelerate the transition of foam concrete from tensile failure to shear failure, causing large-scale cracking within the material earlier. The results of AE and DIC complement each other, and their combination helps to comprehensively understand the development of micro-cracks and the damage mechanisms of foam concrete under freeze-thaw conditions.
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