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18 results on '"Shao, H.Y."'

4. The review of early hydration of cement-based materials by electrical methods

Author

Tang, S.W., Cai, X.H., He, Z., Zhou, W., Shao, H.Y., Li, Z.J., Wu, T., and Chen, E.

Subjects
Porosity -- Analysis, Electrical conductivity -- Analysis, Shrinkage (Materials) -- Analysis, Cements (Building materials) -- Electric properties -- Mechanical properties -- Analysis, Business, Construction and materials industries
Abstract

ABSTRACT This paper reviews the evaluation of hydration of cement-based materials by means of electrical methods from the view point of direct and alternative current methods. The merits, demerits and [...]

Published
2017
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5. Volume and surface fractal dimensions of pore structure by NAD and LT-DSC in calcium sulfoaluminate cement pastes

Author

Tang, S.W., He, Z., Cai, X.H., Cai, R.J., Zhou, W., Li, Z.J., Shao, H.Y., Wu, T., and Chen, E.

Subjects
Calorimetry -- Usage -- Analysis, Porosity -- Analysis, Superplasticizers -- Mechanical properties -- Chemical properties -- Analysis, Cements (Building materials) -- Mechanical properties -- Chemical properties -- Analysis, Business, Construction and materials industries
Abstract

ABSTRACT This paper presents a preliminary work to evaluate influences of water to cement ratio, hydration age and content of superplasticizer on porosity, volume and surface fractal dimensions of pore [...]

Published
2017
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6. The review of pore structure evaluation in cementitious materials by electrical methods

Author

Tang, S.W., Cai, X.H., He, Z., Zhou, W., Shao, H.Y., Li, Z.J., Wu, T., and Chen, E.

Subjects
Concrete -- Analysis -- Mechanical properties, Cement -- Analysis -- Mechanical properties, Business, Construction and materials industries
Abstract

ABSTRACT This paper reviews the evaluation of pore structure in cementitious materials by means of electrical impedance methods from the view point of direct and alternative current tests with or [...]

Published
2016
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7. In-situ and continuous monitoring of pore evolution of calcium sulfoaluminate cement at early age by electrical impedance measurement

Author

Tang, S.W., Cai, X.H., Zhou, W., Shao, H.Y., He, Z., Li, Z.J., Ji, W.M., and Chen, E.

Subjects
Raman spectroscopy -- Usage, Porosity -- Analysis, Adsorption -- Analysis -- Measurement, Cement -- Analysis -- Mechanical properties, Business, Construction and materials industries
Abstract

ABSTRACT This paper investigates the microstructure evolution of CSA cement pastes with different water to cement ratios in various hydration stages. Microstructure information, such as porosity, cumulative and incremental pore [...]

Published
2016
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8. Hydration process of fly ash blended cement pastes by impedance measurement

Author

Tang, S.W., Cai, X.H., He, Z., Shao, H.Y., Li, Z.J., and Chen, E.

Subjects
Zeolites -- Analysis -- Measurement, Cement -- Analysis -- Measurement, Business, Construction and materials industries
Abstract

ABSTRACT This study focuses on the early-age hydration development in fly ash blended cement pastes. The characteristic features in different hydration stages and the evolution of zeolites phase, viz., gismondine, [...]

Published
2016
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9. Hydration stage identification and phase transformation of calcium sulfoaluminate cement at early age

Author

Tang, S.W., Zhu, H.G., Li, Z.J., Chen, E., and Shao, H.Y.

Subjects
Infrared spectroscopy -- Analysis, Hydration (Chemistry) -- Analysis, Atomic force microscopy -- Analysis, Cement -- Analysis -- Properties, Business, Construction and materials industries
Abstract

ABSTRACT This paper studies hydration stages and phase transformation mechanism of fresh calcium sulfoaluminate (CSA) cement. Features of different hydration stages of CSA cement paste are identified by non-contact impedance [...]

Published
2015
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10. A fractal approach to determine thermal conductivity in cement pastes

Author

Tang, S.W., Chen, E., Shao, H.Y., and Li, Z.J.

Subjects
Fly ash -- Analysis -- Thermal properties, Cement -- Analysis -- Thermal properties, Business, Construction and materials industries
Abstract

ABSTRACT This paper presents a preliminary work to evaluate the thermal conductivity performance in pure and blended cement pastes with fly ash, slag and silica fume. The thermal conductivity of [...]

Published
2015
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11. Characterization of early-age hydration process of cement pastes based on impedance measurement

Author

Tang, S.W., Li, Z.J., Shao, H.Y., and Chen, E.

Subjects
Infrared spectroscopy -- Chemical properties -- Measurement -- Analysis, Calorimetry -- Chemical properties -- Measurement -- Analysis, Cement -- Chemical properties -- Measurement -- Analysis, Business, Construction and materials industries
Abstract

ABSTRACT This paper investigates the hydration process of cement pastes using an isothermal calorimetry, Fourier transforms infrared spectroscopy (FTIR), X-ray diffraction (XRD) analysis and non-contact impedance measurement (NCIM). The reliability [...]

Published
2014
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12. Permeability interpretation for young cement paste based on impedance measurement

Author

Tang, S.W., Li, Z.J., Zhu, H.G., Shao, H.Y., and Chen, E.

Subjects
Porosity -- Analysis -- Measurement, Permeability -- Analysis -- Measurement, Cement -- Analysis -- Measurement -- Properties -- Models, Business, Construction and materials industries
Abstract

ABSTRACT This paper evaluates the permeability assessment of young cement pastes using innovative Non-Contact Impedance Measurement (NCIM). A fractal permeability model based on NCIM is proposed in this work. The [...]

Published
2014
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13. Impedance measurement to characterize the pore structure in Portland cement paste

Author

Tang, S.W., Li, Z.J., Chen, E., and Shao, H.Y.

Subjects
Portland cement -- Analysis -- Electric properties, Business, Construction and materials industries
Abstract

ABSTRACT This paper proposes an alternative way to characterize the pore structure in cement pastes using an innovative non-contact impedance measurement. This methodology is based on the pore fractal theory: [...]

Published
2014
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15. Non-steady state migration of chloride ions in cement pastes at early age

Author

Tang, S.W., Li, Zongjin, Chen, E., Shao, H.Y., Tang, S.W., Li, Zongjin, Chen, E., and Shao, H.Y.

Abstract

This paper proposes preliminary work to study the diffusion and migration of chloride ions in cement pastes at early age. The non-steady state ion migration coefficients of cement pastes are evaluated from three aspects: (1) electrical rapid ion migration test; (2) non-contact impedance measurement (NCIM) based on a fractal model; and (3) a corresponding simulation of an "I" shape fractal network. The experimental results from electrical rapid ion migration tests and NCIM have good agreement. The influences of water to cement ratio, curing hydration age and addition of mineral admixtures on the performance of ion diffusion/migration in cement pastes are investigated.

Published
2014

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