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学者姓名：庄树森
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Abstract ：
A novel self-healing cementitious composite SMA-ECC is utilized to enhance corrosion resistance and maintain mechanical properties in chloride environment. The purpose of this study is to investigate the impact of the loading level on embedded steel rebar corrosion and the self-healing performance of SMA-ECC. The study examined the damage conditions, mechanical properties, and rebar corrosion resistance following a loading test. Chloride ingress depth and electrochemical tests were adopted to evaluate the corrosion resistance of the specimens. The findings reveal that SMA-ECC exhibits remarkable self-healing abilities in terms of damage recovery and restoration of mechanical properties. Cracks smaller than 50 mu m can achieve a 100 % closure rate in SMA-ECC. It was observed that specimens with less damage (50 %, 70 % damage conditions) displayed improved chloride resistance (SMA-ECC in 50 % damage condition has equivalent corrosion resistance in terms of corrosion current density compared to intact NC control specimens), leading to higher corrosion resistance for SMA-ECC according to the electrochemical test results.
Keyword ：
Corrosion resistance Corrosion resistance ECC ECC Loading level Loading level Self-healing Self-healing Shape memory alloy Shape memory alloy
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| GB/T 7714 | Chen, Weihong , Lin, Boxu , Zheng, Jianfeng et al. Effect of loading level on the corrosion resistance of a novel self-healing cementitious composite [J]. | JOURNAL OF BUILDING ENGINEERING , 2024 , 90 . |
| MLA | Chen, Weihong et al. "Effect of loading level on the corrosion resistance of a novel self-healing cementitious composite" . | JOURNAL OF BUILDING ENGINEERING 90 (2024) . |
| APA | Chen, Weihong , Lin, Boxu , Zheng, Jianfeng , Cui, Shuangshuang , Zhuang, Shusen . Effect of loading level on the corrosion resistance of a novel self-healing cementitious composite . | JOURNAL OF BUILDING ENGINEERING , 2024 , 90 . |
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This study systematically investigates the effects of high-power continuous wave laser (CWL) treatment on the mechanical behavior and failure mechanisms of SM400A steel, comparing these outcomes with those of untreated specimens. The findings reveal that while CWL treatment enhances surface hardness, it has minimal impact on the strength of thick structural steel components. However, excessive laser energy density leads to surface defects and softening of the microstructure, adversely affecting the material's toughness. This results in a reduction in elongation at fracture, transitioning the failure mode from ductile to brittle. The study concludes that to ensure the safe use of laser-treated structures, the laser energy density should be carefully controlled not to exceed 3000 J/cm(2).
Keyword ：
Continuous wave laser Continuous wave laser Failure mechanism Failure mechanism Mechanical properties Mechanical properties Tensile test Tensile test
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| GB/T 7714 | Wang, Qidi , Kainuma, Shigenobu , Zhuang, Shusen et al. Mechanical properties and tensile failure mechanisms of SM400A steel treated by high-power continuous-wave laser [J]. | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 32 : 4293-4303 . |
| MLA | Wang, Qidi et al. "Mechanical properties and tensile failure mechanisms of SM400A steel treated by high-power continuous-wave laser" . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 32 (2024) : 4293-4303 . |
| APA | Wang, Qidi , Kainuma, Shigenobu , Zhuang, Shusen , Fujita, Kazuhisa , Ruan, Xin . Mechanical properties and tensile failure mechanisms of SM400A steel treated by high-power continuous-wave laser . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 32 , 4293-4303 . |
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Magnesium phosphate cement (MPC), a cementitious material that hardens through an acid-base reaction, is theoretically expected to exhibit strong acid resistance. However, studies on the durability of MPC in acidic environments remain limited. This study aims to systematically evaluate the acid resistance of MPC in common inorganic acid solutions across various pH levels. By measuring changes in compressive strength, mass loss, apparent changes, pH changes, and the microstructure evolution of MPC under acidic conditions, the mechanisms and influencing factors of its acid resistance are revealed. The results indicate that at pH levels of 1.0 and 2.0, MPC's resistance to H2SO4 and HCl erosion is markedly superior compared to its performance against H3PO4, as evidenced by compressive strength retention, mass loss, and visible erosion. At pH levels above 2.0, MPC demonstrates robust resistance to all tested corrosive media, with compressive strength retention ranging from 68.9% to 86.9%, irrespective of the acid source. Although new corrosion products form in these acidic environments, the adverse effects of NH4/P loss from struvite, along with the redissolution of corrosion products due to their higher solubility, increase porosity and subsequently reduce the mechanical strength. Nevertheless, considering that strength retention is significantly higher than that of other cement-based materials reported in the literature, MPC still exhibits good acid resistance and is suitable for environments requiring enhanced resistance to acid corrosion.
Keyword ：
hydration hydration inorganic acid-resistance inorganic acid-resistance macro performance macro performance magnesium phosphate cement magnesium phosphate cement microstructure microstructure
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| GB/T 7714 | Sun, Huaqiang , Zhuo, Kanghong , Lin, Tianzhu et al. Inorganic Acid Resistance Performances of Magnesium Phosphate Cement: A Two-Year Observation [J]. | MATERIALS , 2024 , 17 (22) . |
| MLA | Sun, Huaqiang et al. "Inorganic Acid Resistance Performances of Magnesium Phosphate Cement: A Two-Year Observation" . | MATERIALS 17 . 22 (2024) . |
| APA | Sun, Huaqiang , Zhuo, Kanghong , Lin, Tianzhu , Zhuang, Shusen , Kang, Sixiang , Ma, Congcong et al. Inorganic Acid Resistance Performances of Magnesium Phosphate Cement: A Two-Year Observation . | MATERIALS , 2024 , 17 (22) . |
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This study examined the axial force loss of high-strength bolts after a 3-kW continuous-wave laser (CWL) treatment. Friction connection specimens with M22 high-strength bolts were prepared, and a fixed-angle rotary CWL transmitter with a 26-mm-diameter laser ring and rotating platform was used for nut rotary cleaning of high-strength bolts. Changes in the axial force and temperature of the bolts were monitored during the laser treatment based on the irradiation duration on the nut surface. The experimental results indicated that the minimum and final stable values of the axial force during CWL treatment are affected by the irradiation duration. Multiple rounds of irradiation can reduce the bolt axial force loss for the same total irradiation duration. The 26 -mm-diameter laser ring can sufficiently cover the surface of commonly used bolt heads and nuts in bridges, and the local temperature effect does not influence the axial force loss in adjacent bolts. The distribution of the bolt temperature when the CWL treatment the bolt is simulated by an FE model, which proves the overall temperature of the bolt does not exceed 300 degrees C and remains in a normal working condition when the continuous irradiation duration is less than 45 s. From the relationship between the axial force change and treatment duration, the axial force loss formula was fitted, which can help provide a maintenance plan for M22 bolt cleaning using 3-kW CWL.
Keyword ：
Axial force Axial force Continue wave laser Continue wave laser High strength bolt High strength bolt Laser cleaning Laser cleaning
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| GB/T 7714 | Wang, Qidi , Kainuma, Shigenobu , Huo, Peng et al. Continuous-wave-laser surface cleaning of high strength bolts: Analysis of bolt axial force loss [J]. | STRUCTURES , 2023 , 48 : 1598-1608 . |
| MLA | Wang, Qidi et al. "Continuous-wave-laser surface cleaning of high strength bolts: Analysis of bolt axial force loss" . | STRUCTURES 48 (2023) : 1598-1608 . |
| APA | Wang, Qidi , Kainuma, Shigenobu , Huo, Peng , Zhuang, Shusen . Continuous-wave-laser surface cleaning of high strength bolts: Analysis of bolt axial force loss . | STRUCTURES , 2023 , 48 , 1598-1608 . |
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This study investigated the effect of sustained loading on the cumulative damage of a newly developed smart cement-based self-healing composite material (SMA-ECC). SMA-ECC is composed of engineered cementitious composite (ECC) and shape memory alloy (SMA) fibers. A uniaxial compressive test with five predefined loading levels (0%, 30%, 40%, 50%, and 60% of compressive strength) was conducted on SMA-ECC hollow-cylindrical specimens and ECC control hollow-cylindrical specimens. The cumulative damage was mainly determined by changes in the total water absorption of different groups of specimens during three different periods (not loaded, at a predefined loading level, and after unloading). A normalized water content index was proposed to couple the effects of self-healing, sustained loading, and cumulative damage. The test results indicate that the cumulative water absorption of SMA-ECC was 35% lower than that of ECC, which may indicate less irreparable damage. In addition, the self-healing ability of SMA-ECC specimens under different compression load levels was evaluated through normalized water content analysis. SMA-ECC exhibited a 100% repair rate at load levels of 30% and 40%. At a higher load level of 60%, the repair rate of SMA-ECC was 76%. These results collectively emphasize the significant impermeability and self-healing performance of SMA-ECC after unloading.
Keyword ：
engineered cementitious composites engineered cementitious composites loading level loading level self-repairing self-repairing sustained compressive loading sustained compressive loading water absorption water absorption
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| GB/T 7714 | Chen, Weihong , Han, Chunhui , Liu, Yi et al. Experimental Investigation of Cumulative Damage and Self-Healing Properties of Smart Cementitious Composite under Continuous Compression Load [J]. | MATERIALS , 2023 , 16 (18) . |
| MLA | Chen, Weihong et al. "Experimental Investigation of Cumulative Damage and Self-Healing Properties of Smart Cementitious Composite under Continuous Compression Load" . | MATERIALS 16 . 18 (2023) . |
| APA | Chen, Weihong , Han, Chunhui , Liu, Yi , Feng, Kai , Zhuang, Shusen . Experimental Investigation of Cumulative Damage and Self-Healing Properties of Smart Cementitious Composite under Continuous Compression Load . | MATERIALS , 2023 , 16 (18) . |
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This study explored the feasibility of direct coating of steel surfaces treated with a continuous-wave laser (CWL). The adhesion and corrosion resistance of Heavy-Duty Paint coatings were evaluated on CWL-treated surfaces and compared with those of surfaces treated with molten alumina blasting. The results showed that the surface texture created by CWL provided greater adhesion of the Rc-I coating than its cohesive strength. However, the presence of oxides on the CWL-treated surfaces caused a high cathodic disbondment (CD), which reduced the corrosion resistance of the coated steel in corrosive environments. Decreasing the laser head sweep speed can improve the surface roughness and area but does not address the issues of CD and corrosion creep (CC). This study concludes that, given the limitations of current commercial CWL systems, it is recommended to blast CWL-treated surfaces before coating to improve durability and corrosion resistance in corrosive environments.
Keyword ：
Cathodic disbondment Cathodic disbondment Continuous wave laser Continuous wave laser Corrosion resistance Corrosion resistance Oxide film Oxide film Surface texture Surface texture
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| GB/T 7714 | Wang, Qidi , Kainuma, Shigenobu , Zhuang, Shusen et al. Effect of continuous wave laser treatment on the adhesion and durability of Heavy-Duty Paint coated carbon steel [J]. | CASE STUDIES IN CONSTRUCTION MATERIALS , 2023 , 19 . |
| MLA | Wang, Qidi et al. "Effect of continuous wave laser treatment on the adhesion and durability of Heavy-Duty Paint coated carbon steel" . | CASE STUDIES IN CONSTRUCTION MATERIALS 19 (2023) . |
| APA | Wang, Qidi , Kainuma, Shigenobu , Zhuang, Shusen , Haraguchi, Manabu . Effect of continuous wave laser treatment on the adhesion and durability of Heavy-Duty Paint coated carbon steel . | CASE STUDIES IN CONSTRUCTION MATERIALS , 2023 , 19 . |
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