Surface fractal dimension: An indicator to characterize the microstructure of cement-based porous materials

Zeng, Qiang; Luo, Mingyong; Pang, Xiaoyun; Li, Le; Li, Kefei

doi:10.1016/j.apsusc.2013.05.123

Cited by 181 publications

(85 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The repeating 3 nm globules give a self-similar property to calcium-silicate-hydrate structure for the size range 3-30 nm (Jennings, 2008). This statement has been confirmed by Zeng et al (2010), and the corresponding fractal dimension was determined for HCP with different binder types (Zeng et al, 2013a).…”

Section: Introductionmentioning

confidence: 88%

Pore structure of cement pastes through NAD and MIP analysis

Zeng

Fen‐Chong

et al. 2016

Advances in Cement Research

Self Cite

View full text Add to dashboard Cite

Two cement pastes (water to cement ratio, w/c = 0·5, 0·3) were investigated through mercury intrusion porosimetry (MIP) and nitrogen adsorption/desorption (NAD) methods at different hardening ages. The pore structure is characterised by specific surface area, pore volume and pore size distribution. The results show that: (a) the pore structure has strong scale dependence and NAD-MIP joint measurement helps to identify the different pore structure patterns; (b) MIP total pore volume captures the global process of the hydrates filling process with curing age, the mesopore (2-70 nm) volume is dominated by hydrates filling for w/c = 0·5 but countered by high-density calcium-silicate-hydrate growth for w/c = 0·3; (c) specific surface area is sensitive to calcium-silicate-hydrate growth and specific surface area values are likely to confirm that high w/c (0·5) favours low-density calcium-silicate-hydrate growth whereas low w/c (0·3) facilitates high-density calcium-silicate-hydrate formation.

show abstract

Section: Introductionmentioning

confidence: 88%

Pore structure of cement pastes through NAD and MIP analysis

Zeng

Fen‐Chong

et al. 2016

Advances in Cement Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…The exponent is respectively in the interval 3 < n < 4. Thus, by the slope of log-log linear segments of the SANS dependencies it is possible to determine the scattering objects of a particular fractal type (volume or surface) and the fractal dimension [17][18][19].…”

Section: Methodsmentioning

confidence: 99%

Technogenic resources for nanotechnologies in construction

2017

View full text Add to dashboard Cite

Abstract.A large group of industrial wastes from water purification, treatment and softening has been considered. The reference is made to the fact that slurries are a unique man-made product technologically ready for use and constantly restocking. Slurries have been classified by conditions of the formation, composition, chemical and physical properties. The nanoscale structural parameters of the slurry particles (the size distribution and fractal dimension) have been determined by the neutron small-angle scattering method. The conducted researches allow slurries to be considered a nanotechnogenic raw material. The use of slurries as additives in the building material production process reduces the harmful influence of industrial wastes on the environment and creates a significant reserve of material and energy resources in the construction industry.

show abstract

“…We assumed a uniform hydrophilic surface for the pores of the CBPM. This assumption maybe too coarse to capture the hydrophilicity of the surfaces of the CBPMs, which are composed of multi hydrates and have extremely complex microstructures (Zeng et al , 2013b. The third limitation of the method used in the present study is the assumption of the cylindrical pores for the cement-based specimens.…”

Section: Freezing Strainmentioning

confidence: 98%

What affects the freezing behaviors of cement-based porous materials: The role of the unfrozen liquid-like layer

Zeng¹,

Xu²

2015

Proceedings of the Second International Conference on Performance-Based and Life-Cycle Structural Engineering (PLSE 2015)

View full text Add to dashboard Cite

A key factor that affects freeze-thaw damages of cement-based porous materials (CBPMs) is the amount of the freezable water confined in the pores that generate large internal pressures during freezing. Taking account of an unfrozen liquid-like layer (ULLL) between ice crystals and pore wall, this paper investigates deformations of a saturated CBPM specimen under freezing with different thickness values of the ULLL. To bridge the macro strains and the local pressure exerted on the pore wall of the material, the thermodynamic equilibrium between the water and ice, and a poroelastic approach were adopted. The hydraulic pressure by volume change as phase transition takes place in the pores, the fusion pressure by energy change as ice forms and penetrates through the thin pores and the hydrothermal pressure by TEC discrepancies between the pore fluids and solid substrate dominate the internal freezing stress. The obtained results reveal that the ULLL plays an important role on the estimation of the amount of ice crystals confined in the pores, and thus influences the pore pressures and deformations of the CBPM specimen used. Appropriate model of the ULLL helps to decrease the deviations between the predicted strains and the experimental data.

show abstract

Surface fractal dimension: An indicator to characterize the microstructure of cement-based porous materials

Cited by 181 publications

References 21 publications

Pore structure of cement pastes through NAD and MIP analysis

Pore structure of cement pastes through NAD and MIP analysis

Technogenic resources for nanotechnologies in construction

What affects the freezing behaviors of cement-based porous materials: The role of the unfrozen liquid-like layer

Contact Info

Product

Resources

About