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Start Over Author "Guangcheng Long" Journal journal of materials in civil engineering
7 results on '"Guangcheng Long"'

3. Effect of Packing Density According to CPM on the Rheology of Cement–Fly Ash–Slag Paste

Author

Yiming Peng, Lianshan Yu, Qingquan Xie, Guangcheng Long, Kunlin Ma, and Youjun Xie

Subjects
Cement, Materials science, Composite number, 0211 other engineering and technologies, Slag, 020101 civil engineering, 02 engineering and technology, Building and Construction, Plastic viscosity, 0201 civil engineering, Condensed Matter::Soft Condensed Matter, Sphere packing, Rheology, Mechanics of Materials, visual_art, Fly ash, 021105 building & construction, visual_art.visual_art_medium, Particle, General Materials Science, Composite material, Civil and Structural Engineering
Abstract

Particle-packing theory has been widely applied in the field of composite particle materials, and packing density (Φ) is an important parameter to evaluate the compactness of particle packi...

Published
2021
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4. Performance Evolution and Damage Constitutive Model of Thin Layer SCC under the Coupling Effect of Freeze–Thaw Cycles and Load

Author

Guangcheng Long, Kunlin Ma, Lianshan Yu, Youjun Xie, Li Shuangjie, and Qingquan Xie

Subjects
Materials science, business.industry, Constitutive equation, Thin layer, Building and Construction, Structural engineering, Track (rail transport), CRTS, Coupling effect, Mechanics of Materials, Slab, General Materials Science, business, Civil and Structural Engineering
Abstract

Self-compacting concrete (SCC) is widely used in the China Rail Track System (CRTS) III slab ballastless track filling-layer structure for high-speed railways (HSRs). In cold regions, the t...

Published
2020
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5. Properties of High-Early-Strength Aerated Concrete Incorporating Metakaolin

Author

Gao Yi, Cong Ma, Youjun Xie, and Guangcheng Long

Subjects
musculoskeletal diseases, Magnesium phosphate, Cement, Materials science, technology, industry, and agriculture, 0211 other engineering and technologies, 020101 civil engineering, 02 engineering and technology, Building and Construction, equipment and supplies, 0201 civil engineering, law.invention, Portland cement, surgical procedures, operative, Mechanics of Materials, law, 021105 building & construction, General Materials Science, Aeration, Composite material, Curing (chemistry), Metakaolin, Civil and Structural Engineering
Abstract

Conventional portland cement–based aerated concrete needs autoclaved curing in order to obtain high early-stage strength. Magnesium phosphate cement–based lightweight materials, such as aer...

Published
2019
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6. Effect of Strain Rate on Compressive Behavior and Modeling of Cement and Asphalt Mortar

Author

Youjun Xie, Guangcheng Long, Ditao Niu, Qiang Fu, and Hao Song

Subjects
Cement, Materials science, Strain (chemistry), 0211 other engineering and technologies, 02 engineering and technology, Building and Construction, Strain rate, 021001 nanoscience & nanotechnology, Mechanics of Materials, Asphalt mortar, 021105 building & construction, General Materials Science, Composite material, Mortar, 0210 nano-technology, Civil and Structural Engineering
Abstract

The compressive behavior of cement and asphalt mortar (CA mortar, including Types I and II CA mortar, namely CAI and CAII) under strain rates ranging from 10−5/s to 10−2/s was experimentall...

Published
2018
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7. Effects of Nanoalumina and Graphene Oxide on Early-Age Hydration and Mechanical Properties of Cement Paste

Author

Yan Ming Liu, Guangcheng Long, Wengui Li, Shu Jian Chen, Xiangyu Li, and Wenhui Duan

Subjects
musculoskeletal diseases, Materials science, Diffusion, 0211 other engineering and technologies, Oxide, 02 engineering and technology, Isothermal process, law.invention, chemistry.chemical_compound, Flexural strength, Electrical resistivity and conductivity, law, 021105 building & construction, General Materials Science, Tricalcium aluminate, Composite material, Civil and Structural Engineering, Cement, technology, industry, and agriculture, Building and Construction, equipment and supplies, 021001 nanoscience & nanotechnology, Portland cement, chemistry, Mechanics of Materials, 0210 nano-technology
Abstract

The effects of nanoalumina (NA) and graphene oxide (GO) on the early-age hydration and mechanical properties of portland cement pastes were investigated in this study. The hydration heat release rate and cumulative heat of cement pastes incorporating different dosages of NA and GO were evaluated using an isothermal calorimeter measurement method. Early-age electrical resistivity development was investigated by a noncontact electrical resistivity technique. The results show that both NA and GO could efficiently accelerate cement hydration. As a physical filler, NA significantly accelerates the hydration of tricalcium aluminate (CA) in cement. On the other hand, GO is able to obviously reduce the dormant period of cement hydration and shift the heat flow peaks to the left by accelerating the hydration of tricalcium silicate (CS) in cement. Compared to plain cement pastes, both the compressive and flexural strengths of cement pastes incorporating NA or GO are significantly increased. However, when NA and GO contents exceed the optimal amounts, improvements in flexural strength tend to decline, which is probably due to particle agglomeration. NA-cement paste exhibited slightly higher electrical resistivity than plain cement paste during hydration acceleration and deceleration stages. But GO-cement paste clearly showed lower electrical resistivity, which might be attributed to iron diffusion caused by GO with large surface areas.

Published
2017
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