Porosity–strength relation in calcium aluminate cement pastes

Matusinović, Tomislav; Šipušić, Juraj; Vrbos, Nevenka

doi:10.1016/s0008-8846(03)00201-1

Cited by 100 publications

(41 citation statements)

References 10 publications

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“…For example, in Portland cement foam concrete, the cement binder will have (1) interlayer pores/space in calcium silicate hydrates with width smaller than 1 nm (this type of pores may be not considered in some definition), (2) gel pores between calcium silicate hydrates with width between 1 and 10 nm, and (3) capillary pores between gel clusters with width larger than 10 nm (Pinson et al, 2015), in addition to the introduced voids with width from several micrometers to 1-2 mm (Nambiar and Ramamurthy, 2007a). The total volume of pores, namely porosity, correlates with density and plays an important role that affects the compressive strength of foam concrete (Matusinović et al, 2003). In this study, the connectivity of pores refers the interaction of introduced voids, and this characteristic determines the strength and permeability of foam concrete.…”

mentioning

confidence: 99%

The Pore Characteristics of Geopolymer Foam Concrete and Their Impact on the Compressive Strength and Modulus

Zhang

Wang

2016

Front. Mater.

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The pore characteristics of geopolymer foam concretes (GFCs) manufactured in the laboratory with 0-16% foam additions were examined using image analysis (IA) and vacuum water saturation techniques. The pore size distribution, pore shape, and porosity were obtained. The IA method provides a suitable approach to obtain the information of large pores, which are more important in affecting the compressive strength of GFC. By examining the applicability of the existing models of predicting compressive strength of foam concrete, a modified Ryshkevitch's model is proposed for GFC, in which only the porosity that is contributed by the pores over a critical diameter (>100 μm) is considered. This "critical void model" is shown to have very satisfying prediction capability in the studied range of porosity. A compression-modulus model for Portland cement concrete is recommended for predicting the compression-modulus elasticity of GFC. This study confirms that GFC have similar pore structures and mechanical behavior as those Portland cement foam concrete and can be used alternatively in the industry for the construction and insulation purposes.

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confidence: 99%

The Pore Characteristics of Geopolymer Foam Concrete and Their Impact on the Compressive Strength and Modulus

Zhang

Wang

2016

Front. Mater.

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“…, where k is thermal conductivity from Equation (2), q is effective density from Equation (1), and C p from Equation (4).…”

Section: Physical Modelmentioning

confidence: 99%

“…The foamed concrete is lighter in weight for ease of transportation and of porous structure for better thermal insulation. In the past decades, this field had aroused lots of research interest [1][2][3][4][5]. Several foamed concretes have been developed, including newspaper sandwiched aerated light weight concrete [5] and fly ash based light weight foamed concrete [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of porosity on thermal properties and fire resistance of foamed concrete

Wang

Zhang

et al. 2013

Journal of Sustainable Cement-Based Materials

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The relationship between thermal insulation properties and porosity of fly ash based foam concrete was built, in which effective density, effective heat conductivity, and effective specific heat of fly ash based foam concrete were deduced as functions of porosity. Using the model, the effective heat conductivity of density of 580 kg/m 3 fly ash based foam concrete was the theoretically calculated as 0.145 W/(m K) while the experimental measured value was 0.142 W/(m K). The relative error of heat conductivity was very low at 2.1%. The effective specific heat within the model was 967.05 J/kg K and the experimental value was 920 J/kg K with a relative error of 5.1%. Then, the effective heat conductivity and specific heat models were incorporated into heat transferring model to calculate the temperature field of fly ash based foam concrete wall during a fire incident. Finally, the temperature field of fly ash based foam concrete wall and traditional dense concrete wall during fire incident were calculated and compared. Comparing the temperature field of the fly ash based foam concrete wall with the traditional concrete wall, it was found that at close to fire-side surface, the temperature in the fly ash based foam concrete wall could reach 1039°C, while the lowest temperature in the fly ash based foam concrete wall remained at 20°C for a thickness of 7 mm. In contrast, at close to fire side of surface, the temperature of traditional concrete wall was 987.2°C at 360 s and the lowest temperature in the traditional wall was 102.9°C at the opposite side-wall surface far away from the fire direction. As expected, the data demonstrated that the use of fly ash based foam concrete in wall construction adds greatly to the time for people to leave in safety.

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“…The mesopore structure of concrete has a significant influence on the macro strength and antifreezing performance [9][10][11][12]. The pore structure is composed of several parameters, such as porosity, pore surface area, area median aperture, average aperture, most probable aperture, and pore fractal dimension.…”

Section: Introductionmentioning

confidence: 99%

The Correlation between Pore Structure and Macro Durability Performance of Road Concrete under Loading and Freeze-Thaw and Drying-Wetting Cycles

Zhou

Liang

Xuan

et al. 2017

Advances in Materials Science and Engineering

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The grey correlation theory and multiple regression method are used to reveal macro performance degradation rules of road concrete under loading and freeze-thaw and drying-wetting cycles; then the correlation between mesoscopic pore structure and residual strength and antifreezing index of concrete is analyzed. Under the freeze-thaw and drying-wetting cycles with 50% loading level, the pore structure parameters that influence concrete strength show the following sequence: fractal dimension > most probable pore size > porosity > less harmful pore. The correlation between strength and pore parameters can be represented with multiple nonlinear equations. A negative correlation is shown between strength and fractal dimension and most probable pore size. Conversely, a positive correlation is shown between strength, porosity, and less harmful pore. Under the freeze-thaw and drying-wetting cycles with 80% loading level, the pore structure parameters that influence concrete strength show another sequence: fractal dimension > porosity > less harmful pore > most probable pore size. The correlation between antifreezing index and pore parameters should be described with multiple linear equations. The relative dynamic elastic modulus shows a positive correlation to most probable pore size, pore surface area, and porosity but a negative correlation to less harmful pore and pore spacing coefficient.

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Porosity–strength relation in calcium aluminate cement pastes

Cited by 100 publications

References 10 publications

The Pore Characteristics of Geopolymer Foam Concrete and Their Impact on the Compressive Strength and Modulus

The Pore Characteristics of Geopolymer Foam Concrete and Their Impact on the Compressive Strength and Modulus

Numerical simulation of porosity on thermal properties and fire resistance of foamed concrete

The Correlation between Pore Structure and Macro Durability Performance of Road Concrete under Loading and Freeze-Thaw and Drying-Wetting Cycles

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