Sulfate Ions Immobilization of Calcined Layered Double Hydroxides in Hardened Cement Paste and Concrete

Ma, Jianzhong; Wang, Daguang; Duan, Ping; Shi, Yanke

doi:10.1007/s11595-019-2205-9

Cited by 6 publications

(2 citation statements)

References 3 publications

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“…Wang et al modelled the aircraft hydraulic pipe; they analysed the natural frequency of the degree of hydraulic leakage fault, selected the natural frequencies of the first five orders as the characteristic value of the fault diagnosis, and conducted the fault diagnosis by using the probabilistic neural network (PNN) [7]. Ma et al analysed the reliability of the aircraft hydraulic system by using the GO method, compared the calculated result of the GO method involving a feedback loop with the calculated result of the fault tree analysis method, and verified the validity of the GO method for the reliability analysis and test evaluation of the aircraft hydraulic system [8].…”

Section: Introductionmentioning

confidence: 99%

GAN-Based Fault Diagnosis Method for Aircraft Hydraulic System Under Data Imbalance

Shen

Zhao

2023

Preprint

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In actual operating of the aircraft hydraulic system, the frequency of occurrence of the fault status is much lower than that of the normal status. The faults of the aircraft hydraulic system are very expensive to replicate, making it unrealistic to conduct a real fault simulation experiment of the aircraft hydraulic system. Hence, a large number of data samples related to the normal status of the aircraft hydraulic system is available but very few data samples related to the fault status. This causes a severe data imbalance in the fault diagnosis of the aircraft hydraulic system, that is, the data samples for the normal operation are much more numerous than the fault data samples, which will directly affect the accuracy of aircraft fault diagnosis. To solve the data imbalance in the fault diagnosis of the aircraft hydraulic system, this paper used an auxiliary classifier and gradient penalty Wasserstein generative adversarial network (ACWGAN-GP) algorithm, which can stably and accurately generate high-quality simulated fault data using a small number of fault data, and perform accurate fault diagnosis by using the imbalanced fault data. The ACWGAN-GP algorithm expands the fault data set until a balance is achieved between the normal and fault data. It was verified by simulation that the simulated fault data obtained by this algorithm were highly similar to the real fault data. Hence, the generated data can be used similar to the real fault data. In addition, multiple data-driven intelligent fault diagnosis methods were used to verify the validity of the data and improve the accuracy rate of the fault diagnosis methods. It is concluded that the accuracy level of fault diagnosis increases steadily when the number of fault data is gradually increased until it finally reaches a balance with the number of normal data. In addition, the sample generation mode of the ACWGAN-GP model can be applied to fault diagnosis in other fields.

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Section: Introductionmentioning

confidence: 99%

GAN-Based Fault Diagnosis Method for Aircraft Hydraulic System Under Data Imbalance

Shen

Zhao

2023

Preprint

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“…Chen et al [ 35 ] evaluated the compressive strength and workability of concrete mixed with a combination of LDHs and metakaolin under drying–wetting cycles of sodium sulfate solution. Ma et al [ 36 ] studied the effect of LDHs on the sulfate resistance of concrete specimens curing in a drying–wetting cycle environment by testing the expansion and compressive strength. Chen et al [ 37 ] measured the volume variation of ultra-high-performance concrete (UHPC) specimens with the addition of LDHs in Na 2 SO 4 solution.…”

Section: Introductionmentioning

confidence: 99%

Effect of Layered Double Hydroxides on the Deterioration Process of Cement Paste under Sulfate Attack

et al. 2022

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This study investigated the effect of layered double hydroxides (LDHs) on the deterioration process of cement paste in the sulfate environment. Cement pastes with the addition of original and calcined LDHs at 2.5 wt.% and 5.0 wt.% of cement were exposed to Na2SO4 solution for 360 days. The macroscopic performance of the cement paste was assessed based on mass variation, porosity, compressive strength, and content of sulfate ions. Furthermore, the microhardness, microstructures, and composition of the degraded pastes were examined using Vickers hardness (HV), mercury intrusion porosimetry (MIP), scanning electron microscope (SEM), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). The results indicate that cement paste incorporated with LDHs can mitigate the corrosion caused by sulfate effectively, especially in the case of calcined LDHs (C-LDHs), which primarily increase the adsorption of sulfate. Compared with the control specimen, the 180 d compressive strength loss ratio of specimens with 2.5 wt.% and 5.0 wt.% of C-LDHs decreased by 63.66% and 80.51%, respectively. Moreover, LDHs can reduce the amount of ettringite crystals, densify the microstructure, and refine the pore structure to mitigate the cement paste’s sulfate corrosion significantly. Compared with the control specimen, the 180 d harmful pore volume fraction of specimens laced with 2.5 wt.% and 5.0 wt.% C-LDHs decreased by 43.77% and 54.51%, respectively. In terms of the content of C-LDHs, an optimal content of C-LDHs could ensure the dominant effect of adsorption, while excessive C-LDHs could refine pores. In addition, Vickers hardness has an excellent correlation with compressive strength, which could precisely predict the compressive strength. Moreover, by combining the Vickers hardness distribution and content distribution of sulfate ions, the cross-section of the paste could be classified into four regions to evaluate the deterioration process accurately: the degraded zone, the strengthened zone, the invaded zone, and the intact zone.

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Study on the anti-corrosion and barrier ability of modified sulfoaluminate cement mortar cutoff wall against sulfate

Zhang,

Ye,

Tang

et al. 2023

Construction and Building Materials

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Sulfate Ions Immobilization of Calcined Layered Double Hydroxides in Hardened Cement Paste and Concrete

Cited by 6 publications

References 3 publications

GAN-Based Fault Diagnosis Method for Aircraft Hydraulic System Under Data Imbalance

GAN-Based Fault Diagnosis Method for Aircraft Hydraulic System Under Data Imbalance

Effect of Layered Double Hydroxides on the Deterioration Process of Cement Paste under Sulfate Attack

Study on the anti-corrosion and barrier ability of modified sulfoaluminate cement mortar cutoff wall against sulfate

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