Permeability and pore structure of OPC paste

Cui, Lu; Cahyadi, Jong Herman

doi:10.1016/s0008-8846(00)00474-9

Cited by 193 publications

(74 citation statements)

References 20 publications

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“…10 shows that the general effective media model (GEM) is not suitable for a porous material (this study) but it appears to be a suitable tool for cementitious materials with low porosity (Cui and Cahyadi, 2001). Note that for this study, the procedure employing the GEM model, as proposed by Cui and Cahyadi (2001), was also used to calculate the foamed concrete permeability. Capillary porosities (a difference between the total porosity and the added foam) of 9.23%, 11.23% and 12.13% for FC3, FC6 and FC9, respectively were adopted.…”

Section: Air Permeabilitymentioning

confidence: 94%

“…The authors claimed that in the case of foamed concrete the air voids that are entrained can be considered as an aggregate and their inclusion might reduce the permeability not only by obstructing flow but also because of the absence of microcraking at the interface between air voids and the mortar. In a study of the pore structure of ordinary Portland cement paste, Cui and Cahyadi (2001), defined a critical pore diameter (l c ) as the pore diameter above which a connected path could form throughout a sample and added that the smaller the l c , the finer the pore structure. Yen (2007) listed some of the models used to predict the permeability of concrete as follows: the KozenyCarmen theory, the Katz-Thompson theory (developed for porous stone), statistical modelling, computer network model and composite model theory (also known as general effective media, GEM).…”

Section: Introductionmentioning

confidence: 99%

“…Yen (2007) listed some of the models used to predict the permeability of concrete as follows: the KozenyCarmen theory, the Katz-Thompson theory (developed for porous stone), statistical modelling, computer network model and composite model theory (also known as general effective media, GEM). Cui and Cahyadi (2001) found that the difference in pore structure between stone and cement paste is due to the existence of gel pores in the latter. When the cement paste is very porous, capillary pores form a continuous network throughout the whole material.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Pore Structure and Permeation Characteristics of Foamed Concrete

Hilal

Thom

Dawson

2014

ACT

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A study has been undertaken to investigate the pore structure characteristics, porosity and critical pore diameter of preformed foamed concrete with a density between 1300 and 1900 kg/m 3 , and its effect on the permeation characteristics, water absorption and permeability. Different measured and calculated methods were adopted to determine the above properties and a comparison between them was done. Porosity was measured by apparent, total vacuum saturation and mercury intrusion porosimetry (MIP) methods, while permeability was measured (by constant and falling head methods) and calculated (by the Katz and Thompson model). Total porosity and dry density are found to be clearly related. The critical pore diameter (from the MIP test) and the pore diameter size (>200nm) are found to be closely related to the permeability of foamed concrete.

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Section: Air Permeabilitymentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pore Structure and Permeation Characteristics of Foamed Concrete

Hilal

Thom

Dawson

2014

ACT

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“…The CLDH-modified sample, M-NC-1-180d, showed much lower intrudable porosity than the unmodified sample M-NC-0-180d, and only slightly higher than that of M-NS-0-180d. Table 2 shows the fraction of gel pores (\ 10 nm) [61] within the total intrudable porosities. Based on the results reported in Fig.…”

Section: Pore Structure (Mip)mentioning

confidence: 99%

“…The mobility of ionic species in gel pores (\ 10 nm) is much slower than that in mesopores/macropores, and often considered insignificant for influencing the permeability of gas molecules and ionic species through the samples [61,65]. A higher percentage of permeable pores could result in higher chloride transport parameters [66].…”

Section: Compressive Strengthmentioning

confidence: 99%

Chloride binding and mobility in sodium carbonate-activated slag pastes and mortars

Bernal

Hussein

et al. 2017

Mater Struct

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This study evaluates the chloride binding capacity and the migration of chloride in sodium carbonate-activated slag cements and mortars. The effect on chloride mobility and binding of adding a calcined layered double hydroxide (CLDH) to the binder mix was also assessed. Significantly improved durability characteristics can be achieved for sodium carbonate-activated slag mortars by the addition of small fractions of CLDH, as a consequence of a higher degree of reaction, higher chloride binding capacity, and the refined pore structures present in these modified materials, in comparison with alkali-activated cements produced without CLDH. The addition of CLDH enables the production of sodium carbonateactivated slag cements with notably reduced chloride ingress compared to silicate activated slag cements.

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Experimental analysis on the relationship between pore structure and capillary water absorption characteristics of cement‐based materials

Zhao

Ding

Huang

et al. 2019

Structural Concrete

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Capillary absorption capacity has an important influence on the durability of concrete and is closely related to pore structure. In this study, the pore structure and capillary water absorption of samples were determined by low-field nuclear magnetic resonance spectroscopy and the gravimetric method, respectively. The test results show that the most probable pore diameter and equivalent pore diameter of cement-based materials increase with increasing water to cement ratio (w/c) and fly ash (FA) content and decrease with increasing curing age and cement to sand ratio (c/s). The porosity of cement-based materials increases with increasing w/c and c/s, decreases with increasing curing age, and first decreases and then increases with increasing FA content. The curves for the amount of capillary water absorption per unit area in specimens with the square root of time for cement-based material under different influence factors are similar and show obvious linear and stable stages.The capillary absorption coefficient is nearly linearly related to w/c or c/s, and nonlinearly related to curing age or FA content, observation that are well correlated with the porosity and square root of the equivalent pore radius. A modified model is proposed for the capillary absorption coefficient with consideration of the pore structure, and the theoretical results of the model are in good agreement with the test results. K E Y W O R D Scapillary absorption coefficient, cement-based materials, equivalent pore radius, low-field nuclear magnetic resonance spectroscopy, modified model, porosity Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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Permeability and pore structure of OPC paste

Cited by 193 publications

References 20 publications

Pore Structure and Permeation Characteristics of Foamed Concrete

Pore Structure and Permeation Characteristics of Foamed Concrete

Chloride binding and mobility in sodium carbonate-activated slag pastes and mortars

Experimental analysis on the relationship between pore structure and capillary water absorption characteristics of cement‐based materials

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