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RISS 인기검색어
- 검색키워드
- 저자 : Hongqiang Chu (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Modeling of damage in cement paste subject to external sulfate attack
Chuansheng Xiong,Linhua Jiang,Yan Zhang,Hongqiang Chu 사단법인 한국계산역학회 2015 Computers and Concrete, An International Journal Vol.16 No.6
This study aimed to develop models of sulfate diffusion and ettringite content profile in cement paste for the predication of the damage behavior in cement paste subject to external sulfate. In the models, multiphase reaction equilibrium between ions in pore solution and solid calcium aluminates phases and the microstructure changes in different positions of cement paste were taken into account. The distributions of expansive volume strain and expansion stress in cement paste were calculated based on the ettringite content profile model. In addition, more sulfate diffusion tests and SEM analyses were determined to verify the reliability and veracity of the models. As the results shown, there was a good correlation between the numerical simulation results and experimental evidences. The results indicated that the water to cement ratio (w/c) had a significant influence on the diffusion of sulfate ions, ettringite concentration profile and expansion properties in cement paste specimens. The cracking points caused by ettringite growth in cement paste specimens were predicted through numerical methods. According to the simulation results, the fracture of cement paste would be accelerated when the specimens were prepared with higher w/c or when they were exposed to sulfate solution with higher concentration.
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Zijian Song,Huanchun Cai,Qingyang Liu,Linhua Jiang,Hongqiang Chu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-
In this study, an ultrasound-assisted enzymatic extraction (UEE) method was proposed to augment theanti-corrosion performance of the green inhibitor extracted from waste Platanus acerifolia leaves. Chemical compositions and anticorrosive properties of UEE extract were characterized via multiple technologies. The adsorption film on the steel surface was characterized via X-ray photoelectron spectroscopy(XPS). The surface information of corroded steel was also analyzed. Results showed that, compared withthe ultrasound-assisted alkali extraction (UAE), UEE increased the utilization rate of raw plant materialsby 22%39%. After optimized via response surface methodology, the maximum yield of UEE extract couldreach 27.081 mg/g. Electrochemical results showed, compared with 3% UAE extract, the inhibition efficiencyof 3% UEE extract after 72 h in 0.5 M NaCl was increased by 22% while the extraction time wassaved by 90%. Microscopic observations also proved that UEE extract can effectively mitigate the corrosiondegree where the roughness of steel surface decreased by 63.67%. XPS results revealed that a carbonaceousprotecting layer was formed on steel surfaces. The inhibition mechanism analysis suggestedthat flavonoids and their derivatives were apt to adsorb on the steel surface via chelation and surfacephysical adsorption, which could block the pathway of chloride attack.
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A state-of-the-art review of self-healing stimuli-responsive microcapsules in cementitious materials
Zilang Huang,Zijian Song,Yunsheng Zhang,Saddick Donkor,Linhua Jiang,Hongqiang Chu 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.119 No.-
Cracking is a recurring defect that typically arises during the construction and service periods of cementitiousmaterials. Self-healing based on stimuli-responsive microcapsules has shown to be a cutting-edgetechnology to make cementitious materials sustainable. Despite the reported implementation of microcapsulesin various fields, the strategies toward self-healing of cementitious materials via embeddingmicrocapsules remain a significant challenge. Given this, a review concentrating on the healing explorationof cementitious materials assisted by self-healing stimuli-responsive microcapsules is conductedto bridge the gap. Special attention is given to the encapsulation designs and preparation processes, followedby capsules’ response mechanisms and healing processes. In particular, application scenarios, challengesand future prospects of self-healing stimuli-responsive microcapsules for cementitious materialsare summarized and proposed in detail for the first time. This review attempts to better grasp the futureresearch direction of this field, which provides new perspectives for addressing the cracking issue ofcementitious materials.
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