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Appraising the potential of calcium sulfoaluminate cement-based grouts in simulated permafrost environments

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 5,   Pages 722-731 doi: 10.1007/s11709-023-0950-5

Abstract: The hydration and performance of CSA cement-based grouts cured in cold environments (10, 0, and −10 °Meanwhile, results of the TGA and XRD tests show the generation of a significant quantity of hydrationproducts, which indicates the rapid hydration of CSA cement-based grouts at the early stage at low temperatures

Keywords： permafrost     low temperatures     calcium sulfoaluminate cement-based grouts     hydration reaction     compressive    

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Extending blending proportions of ordinary Portland cement and calcium sulfoaluminate cement blends: Its effects on setting, workability, and strength development

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 5,   Pages 1249-1260 doi: 10.1007/s11709-021-0770-4

Abstract: This study extended blending proportion range of ordinary Portland cement (OPC) and calcium sulfoaluminate (CSA) cement blends, and investigated effects of proportions on setting time, workability, and strength development of OPC-CSA blend-based mixtures. Thermogravimetric analysis (TGA) and X-ray diffraction (XRD) were conducted to help understand the performance of OPC-CSA blend-based mixtures. The setting time of the OPC-CSA blends was extended, and the workability was improved with increase of OPC content. Although the early-age strength decreased with increase of OPC content, the strength development was still very fast when the OPC content was lower than 60% due to the rapid formation and accumulation of ettringite. At 2 h, the OPC-CSA blend-based mortars with OPC contents of 0%, 20%, 40%, and 60% achieved the unconfined compressive strength (UCS) of 17.5, 13.9, 9.6, and 5.0 MPa, respectively. The OPC content had a negligible influence on long-term strength. At 90 d, the average UCS of the OPC-CSA blend-based mortars was 39.2 ± 1.7 MPa.

Keywords： calcium sulfoaluminate cement     cement blends     hydration reaction     setting     workability     compressive strength    

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Thermodynamic analysis of ethanol synthesis from hydration of ethylene coupled with a sequential reaction

Jie Gao, Zhikai Li, Mei Dong, Weibin Fan, Jianguo Wang

Frontiers of Chemical Science and Engineering 2020, Volume 14, Issue 5,   Pages 847-856 doi: 10.1007/s11705-019-1848-6

Abstract: Coal-based ethanol production by hydration of ethylene is limited by the low equilibrium ethylene conversionTo improve ethylene conversion, coupling hydration of ethylene with a potential ethanol consumption reaction

Keywords： ethylene     ethanol     thermodynamics     coupling    

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A general framework for modeling long-term behavior of earth and concrete dams

Bernhard A. SCHREFLER, Francesco PESAVENTO, Lorenzo SANAVIA, Giuseppe SCIUME, Stefano SECCHI, Luciano SIMONI

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 1,   Pages 41-52 doi: 10.1007/s11709-010-0070-x

Abstract: They range from hydraulic fracturing to alkali-silica reaction (ASR) and to repair work in concrete dams

Keywords： earth dams     concrete dams     multiphase porous materials     coupled problems     hydraulic fracture     concrete hydration     alkali-silica reaction (ASR)     finite element method    

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Quantification of hydration products in cementitious materials incorporating silica nanoparticles

L. P. SINGH,A. GOEL,S. K. BHATTACHARYYA,G. MISHRA

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 2,   Pages 162-167 doi: 10.1007/s11709-015-0315-9

Abstract: silica nanoparticles (30-70nm) were supplemented into cement paste to study their influence on degree of hydrationAs the hydration time proceeds, the degree of hydration reach to 76% in nano-modified cement paste whereasAn influence of degree of hydration on the porosity was also determined.is ~35 % only, it revealed that silica nanoparticles refines the pore structure due to accelerated hydrationThese studies reveal that the hydration mechanism of the cement can be tuned with the incorporation of

Keywords： degree of hydration     porosity     calcium-silicate-hydrate (C-S-H)     silica nanoparticles    

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Hydration, microstructure and autogenous shrinkage behaviors of cement mortars by addition of superabsorbent

Beibei SUN, Hao WU, Weimin SONG, Zhe LI, Jia YU

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 5,   Pages 1274-1284 doi: 10.1007/s11709-020-0656-x

Abstract: The present study systematically and quantitively investigated the effect of SAP on hydration, autogenousInfluences of SAP on hydration heat and autogenous shrinkage were studied by utilizing TAM AIR technologyAlthough SAP decreased the peak rate of hydration heat and retarded the hydration, it significantly increasedthe cumulative heat, indicating SAP helps promote the hydration.Hydration promotion caused by SAP mainly occurred in the deceleration period and attenuation period.

Keywords： Superabsorbent Polymer     mechanical properties     hydration heat     autogenous shrinkage     microstructure    

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Analysis and control of hydration heat of cast-in-place diaphragm of segmental precast box girder

Chen Yang,Zhong Yao,Zheng Kaiqi,Shen Bin,Meng Shaoping

Strategic Study of CAE 2013, Volume 15, Issue 8,   Pages 99-103

Abstract: Considering the volume of the diaphragm, it belongs to massive concrete,in which concrete hydration heatfield theory, numerical simulation with ANSYS was performed, to investigate the distribution law of hydrationto lead to concrete cracking, longitudinal micro-cracks along the webs is also observed during the hydration

Keywords： concrete box girder     hydration heat     temperature field     stress field     cracks    

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Thermodynamic analysis of reaction pathways and equilibrium yields for catalytic pyrolysis of naphtha

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 12,   Pages 1700-1712 doi: 10.1007/s11705-022-2207-6

Abstract: Herein, for a better catalyst design and operation parameters optimization, the reaction pathways andThe results revealed that the thermodynamically favorable reaction pathways for n/iso-paraffinsThe results are thus useful as a direction for future catalyst improvements, facilitating superior reaction

Keywords： naphtha     catalytic pyrolysis     reaction pathway     equilibrium yield    

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Effect of a commercial dispersion of multi walled carbon nanotubes on the hydration of an oil well cementing

Ocar Aurelio MENDOZA REALES,William C.PEARL Jr,Maria D. M. PAIVA,CristianeR. MIRANDA,Romildo Dias TOLEDO FILHO

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 2,   Pages 174-179 doi: 10.1007/s11709-015-0324-8

Abstract: work studies the influence of a commercial dispersion of multi wall carbon nanotubes (MWCNT) on the hydrationIsothermal calorimetry results showed a clear retardation of the hydration of cement caused by the surfactantNevertheless, thermogravimetric evaluations showed that once the hydration reaction resumed, the retardationeffect of the surfactant did not have a negative impact on the amount of hydration products precipitated

Keywords： carbon nanotubes     surfactant     retardation     combined water     C-S-H    

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Hydration Characteristics and Microstructure of Alkali-Activated Slag Concrete: A Review Review

Qiang Fu,Mengxin Bu,Zhaorui Zhang,Wenrui Xu,Qiang Yuan,Ditao Niu

Engineering 2023, Volume 20, Issue 1,   Pages 162-179 doi: 10.1016/j.eng.2021.07.026

Abstract: The progress of the research on the hydration characteristics, microstructure, interfacial transitionthe slag composition, the type and dosage of the alkali activator, and the curing conditions on the hydration

Keywords： Alkali-activated slag concrete     hydration characteristics     pore structure     interfacial transition zone     Microstructure    

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Compressive behavior and microstructure of concrete mixed with natural seawater and sea sand

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 6,   Pages 1347-1357 doi: 10.1007/s11709-021-0780-2

Abstract: (SEM) and X-ray powder diffraction (XRD) methods were applied to understand the microstructure and hydration

Keywords： seawater and sea sand concrete     compressive strength     strain field     microstructure     hydration products    

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Concrete crack and control

Miao Changwen,Liu Jianzhong,Tian Qian

Strategic Study of CAE 2013, Volume 15, Issue 4,   Pages 30-35

Abstract: Based on the regulation of early age hydration of cement,  a new technology was introduced for impro-ving

Keywords： concrete     crack     shrinkage     hydration heat     toughness    

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Advance in FCC Process Reaction Chemistry

Xu Youhao and Wang Xieqing

Strategic Study of CAE 2007, Volume 9, Issue 8,   Pages 6-14

Abstract: style="text-align: justify;">Faced the stringent challenge of FCC process,  the multi-dimensional reactionstructure was proposed for FCC process reaction chemistry. The multi-dimension reaction structure mode was established on the basis of hydrocarbon reaction FCC process with multi-dimensional reaction structure has more production modes. The multi-dimensional reaction structure was used to successfully develop MIP process aiming at

Keywords： catalytic cracking     reaction chemistry     catalyst     two different reaction zones     multi--dimensional reaction    

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Heterogeneous reaction mechanism of gaseous HNO

Nan ZHAO,Qingzhu ZHANG,Wenxing WANG

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 5, doi: 10.1007/s11783-016-0836-z

Abstract: We studied the heterogeneous reaction mechanism of gaseous HNO with solid NaCl.Water molecules induce surface reconstruction of NaCl to facilitate the reaction.This paper aimed at the heterogeneous reaction between gaseous HNO and solid NaCl.imply that water molecules induce the surface reconstruction, which is essential for the heterogeneous reaction

Keywords： Seasalt particles     NaCl     HNO3     Heterogeneous reaction     Reaction mechanism     Density functional theory    

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Dual-reaction-center catalytic process continues Fenton’s story

Chao Lu, Kanglan Deng, Chun Hu, Lai Lyu

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 5, doi: 10.1007/s11783-020-1261-x

Abstract: Abstract • Dual-reaction-center (DRC) system breaks through bottleneck of Fenton reaction. • UtilizationHowever, both heterogeneous and homogeneous Fenton/Fenton-like technologies follow the classical reactionSo even after a century of development, this reaction still suffers from its inherent bottlenecks inbeen focusing on studying a novel heterogeneous Fenton catalytic process, and we developed the dual-reaction-centerThe construction of the DRC and its performance in the pollutant degradation and interfacial reaction

Keywords： Dual reaction centers     Fenton     Pollutant utilization     Electron transfer    

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Title Author Date Type Operation

Appraising the potential of calcium sulfoaluminate cement-based grouts in simulated permafrost environments

Journal Article

Extending blending proportions of ordinary Portland cement and calcium sulfoaluminate cement blends: Its effects on setting, workability, and strength development

Journal Article

Thermodynamic analysis of ethanol synthesis from hydration of ethylene coupled with a sequential reaction

Jie Gao, Zhikai Li, Mei Dong, Weibin Fan, Jianguo Wang

Journal Article

A general framework for modeling long-term behavior of earth and concrete dams

Bernhard A. SCHREFLER, Francesco PESAVENTO, Lorenzo SANAVIA, Giuseppe SCIUME, Stefano SECCHI, Luciano SIMONI

Journal Article

Quantification of hydration products in cementitious materials incorporating silica nanoparticles

L. P. SINGH,A. GOEL,S. K. BHATTACHARYYA,G. MISHRA

Journal Article

Hydration, microstructure and autogenous shrinkage behaviors of cement mortars by addition of superabsorbent

Beibei SUN, Hao WU, Weimin SONG, Zhe LI, Jia YU

Journal Article

Analysis and control of hydration heat of cast-in-place diaphragm of segmental precast box girder

Chen Yang,Zhong Yao,Zheng Kaiqi,Shen Bin,Meng Shaoping

Journal Article

Thermodynamic analysis of reaction pathways and equilibrium yields for catalytic pyrolysis of naphtha

Journal Article

Effect of a commercial dispersion of multi walled carbon nanotubes on the hydration of an oil well cementing

Ocar Aurelio MENDOZA REALES,William C.PEARL Jr,Maria D. M. PAIVA,CristianeR. MIRANDA,Romildo Dias TOLEDO FILHO

Journal Article

Hydration Characteristics and Microstructure of Alkali-Activated Slag Concrete: A Review

Qiang Fu,Mengxin Bu,Zhaorui Zhang,Wenrui Xu,Qiang Yuan,Ditao Niu

Journal Article

Compressive behavior and microstructure of concrete mixed with natural seawater and sea sand

Journal Article

Concrete crack and control

Miao Changwen,Liu Jianzhong,Tian Qian

Journal Article

Advance in FCC Process Reaction Chemistry

Xu Youhao and Wang Xieqing

Journal Article

Heterogeneous reaction mechanism of gaseous HNO

Nan ZHAO,Qingzhu ZHANG,Wenxing WANG

Journal Article

Dual-reaction-center catalytic process continues Fenton’s story

Chao Lu, Kanglan Deng, Chun Hu, Lai Lyu

Journal Article