Xiang Hu
Hunan University
MortarConductivityCuring (chemistry)IonComposite materialShrinkageMixing (process engineering)MetallurgyMaterials scienceAlkali metalCorrosionEquivalent circuitChlorideCementitiousCalcium silicate hydratePortland cementCement pasteCompressive strengthChemical engineeringCementThermogravimetric analysisPorosityZeta potentialFly ashMicrostructureSlag
34Publications
11H-index
390Citations
Publications 28
Newest
#2Xiang HuH-Index: 11
Last. Deju ZhuH-Index: 27
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#1Bao Lu (Hunan University)H-Index: 5
#2Pingping He (Hunan University)
Last. Xiang Hu (Hunan University)H-Index: 11
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Abstract null null Understanding the effect of formed calcium carbonate and highly polymerization of silicates on the microstructure of cement paste exposed to early CO2 curing and further hydration process is crucial to comprehend the mechanisms of CO2 curing. In this paper, the cement pastes were further cured in water after CO2 curing under two CO2 concentrations (3% and 20%) and the carbonation depth, compressive strength, composition and morphology of the formed products were characterized....
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#1Yue Wang (Hunan University)
#2Bao Lu (Hunan University)H-Index: 5
Last. Moncef L. Nehdi (UWO: University of Western Ontario)H-Index: 51
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Abstract null null Permeability is an important indicator of the durability of cement-based materials. Surface treatments are effective in reducing permeability, and thus improving durability. In this study, CO2 surface treatment, as a new method, was investigated explore the efficiency on cement-fly ash-slag ternary concrete. The results show that the CO2 surface treatment densified surface microstructure and reduced both air and water permeability of concrete. With increase in fly ash and slag...
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#1Yifan Zhao (Hunan University)
#2Xiang Hu (Hunan University)H-Index: 11
Last. Deju Zhu (Hunan University)H-Index: 27
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Abstract Extensive studies have been conducted on seawater sea-sand concrete (SSSC) in recent years due to the shortage of freshwater and river-sand in many coastal areas. This paper reviews the properties of seawater and sea-sand and their effects on hydration, microstructure and properties of concrete. The relationship between mixture proportion and the hardening properties and durability of SSSC is discussed and optimization of mixture proportion for better performance of SSSC is studied. The...
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#1Walid Tahri (Hunan University)
#2Xiang Hu (Hunan University)H-Index: 11
Last. Zuhua Zhang (Hunan University)H-Index: 39
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Abstract Reinforcement corrosion reduces the service life of concrete buildings and infrastructures, resulting in significant worldwide economic losses every year. Alkali-activated materials (AAMs) has been widely considered as a type of greener alternative to Portland cement due to its comparable mechanical properties and much lower energy and resource consumption and emissions. The high alkalinity of pore solution and unique microstructure endow AAM a very promising materials to manufacture st...
1 CitationsSource
#1Baixing Song (University of South China)H-Index: 1
#2Caijun Shi (Hunan University)H-Index: 71
Last. Guojun Ke (University of South China)
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Abstract Early CO2 curing has attracted a lot of attentions due to sequestration of carbon dioxide and rapid strength development for cement-based materials. This study investigates the chloride transport and binding properties of fly ash-blended cement-based materials with and without early CO2 curing. A comparison is made between the specimens exposed to early CO2 curing followed by subsequent water curing and those continuously cured in water. Results show that early CO2 curing decreases the ...
1 CitationsSource
#1Xiang Hu (Hunan University)H-Index: 11
#2Caijun Shi (UBC: University of British Columbia)H-Index: 71
Last. Zemei Wu (Hunan University)H-Index: 21
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Abstract This paper investigates the influences of supplementary cementitious materials (SCMs) on the compressive strength and chloride ion permeability of cement mortar with ultra-low water to binder ratio. The applicable of rapid chloride migration (RCM) test on the evaluation of chloride penetration resistance is studied. Test results show that with the decreased specimen thickness and extended standing time during water saturation process, the chloride migration coefficient of cement mortars...
2 CitationsSource
#1Xiang Hu (Hunan University)H-Index: 11
#2Caijun Shi (Hunan University)H-Index: 71
Last. Zuhua Zhang (Hunan University)H-Index: 39
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Abstract In this study, electrical impedance spectroscopy (EIS) is applied to investigate the effect of alkali dosage on the microstructural evolution of the alkali-activated slag (AAS) system during the curing process. Pore solution chemistry and pore structure of the paste samples were also determined to get auxiliary interpretation of the EIS results. It is shown by equivalent circuit analysis that the resistance attributed to continuous (R1) and discontinuous pores (R2) increases with curing...
1 CitationsSource
#1Xiang Hu (Hunan University)H-Index: 11
#2Caijun Shi (Hunan University)H-Index: 71
Last. Geert De Schutter (UGent: Ghent University)H-Index: 38
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Abstract In this paper, the characteristics of AC impedance spectroscopy of cement paste immersed in chloride solution were measured and analyzed with a proposed equivalent circuit model. The elements in the proposed equivalent circuit, including the resistance of interface between electrode and specimens, resistance of continuous and discontinuous pore, capacitance of solid phase and electrical double layer (EDL) were discussed. The results showed that the resistance of interface between electr...
3 CitationsSource
#1Xiang Hu (Hunan University)H-Index: 11
#2Caijun Shi (Hunan University)H-Index: 71
Last. Geert De Schutter (UGent: Ghent University)H-Index: 38
view all 5 authors...
Abstract Pore solution expression is a widely accepted approach to extract pore solution of cement-based materials by appllying high pressure. In this study, the variations of pore solution distribution and chloride content in cement pastes before and after pore solution expression were examined. The results showed that the value of chloride concentration index Nc were mostly higher than 1.0 for cement pastes immersed in NaCl solution, and decreased with the chloride concentration of soaking sol...
5 CitationsSource