Development of technique for observing pores in hardened cement paste

Tanaka, Kyoji; Kurumisawa, Kiyofumi

doi:10.1016/s0008-8846(02)00806-2

Cited by 104 publications

(85 citation statements)

References 7 publications

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“…Before mercury intrusion test, the samples were dried in an oven at about 110 °C until constant weight to remove moisture in the pores. MIP is based on the assumption that the non-wetting liquid mercury (the contact angle between mercury and solid is greater than 90°) will only intrude in the pores of porous material under pressure 46,47 . Each pore size is quantitatively determined from the relationship between the volume of intruded mercury and the applied pressure 47 .…”

Section: Methodsmentioning

confidence: 99%

“…MIP is based on the assumption that the non-wetting liquid mercury (the contact angle between mercury and solid is greater than 90°) will only intrude in the pores of porous material under pressure 46,47 . Each pore size is quantitatively determined from the relationship between the volume of intruded mercury and the applied pressure 47 . The relationship between the pore diameter and applied pressure is generally described by Washburn equation as follows 46,47 :…”

Section: Methodsmentioning

confidence: 99%

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The effects of ZnO2 nanoparticles on properties of concrete using ground granulated blast furnace Slag as binder

Nazari

Riahi

2011

Mat. Res.

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In the present study, flexural strength together with pore structure, thermal behavior and microstructure of concrete containing ground granulated blast furnace slag with different amount of ZnO 2 nanoparticles has been investigated. Portland cement was replaced by different amounts of ground granulated blast furnace slag and the properties of concrete specimens were investigated. Although it negatively impact the properties of concrete, ground granulated blast furnace slag was found to improve the physical and mechanical properties of concrete up to 45 wt. (%). ZnO 2 nanoparticles with the average particle size of 15 nm were added partially to concrete with the optimum content of 45 wt. (%) of ground granulated blast furnace slag and physical and mechanical properties of the specimens was measured. ZnO 2 nanoparticle as a partial replacement of cement up to 3 wt. (%) could accelerate C-S-H gel formation as a result of increased crystalline Ca(OH) 2 amount at the early age of hydration and hence increase flexural strength of concrete. The increased the ZnO 2 nanoparticles' content more than 3 wt. (%), causes the reduced the flexural strength because of the decreased crystalline Ca(OH) 2 content required for C-S-H gel formation together with unsuitable dispersion of nanoparticles in the concrete matrix. ZnO 2 nanoparticles could improve the pore structure of concrete and shift the distributed pores to harmless and few-harm pores.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

The effects of ZnO2 nanoparticles on properties of concrete using ground granulated blast furnace Slag as binder

Nazari

Riahi

2011

Mat. Res.

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“…However, one should be aware of the fact that the porosity of OPC systems can be controlled through several means such as reduction in water-to-cementing materials ratio (w/cm) facilitated by the use of chemical admixtures, incorporation of other reactive ingredients and improved curing practices. The pore structure of OPC pastes provided here is only used as a point of comparison and not intended to derive quantitative conclusions regarding the pore structure of OPC systems, which can be found in several other publications [34][35][36][37]. Also, for the iron-based binder systems, the composition and curing conditions used are designed to provide the optimal microstructure and strength.…”

Section: Comparison Of the Pore Structures Of Iron Carbonate And Opc-mentioning

confidence: 99%

Pore- and micro-structural characterization of a novel structural binder based on iron carbonation

Das

Stone

Convey

et al. 2014

Materials Characterization

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The pore-and micro-structural features of a novel binding material based on the carbonation of waste metallic iron powder is reported in this paper. The binder contains metallic iron powder as the major ingredient, followed by additives containing silica and alumina to facilitate favorable reaction product formation. Compressive strengths sufficient for a majority of concrete applications are attained. The material pore structure is investigated primarily through mercury intrusion porosimetry whereas electron microscopy is used for microstructural characterization. Reduction in the overall porosity and the average pore size with an increase in carbonation duration from 1 day to 4 days are noticed. The pore structure features are used in predictive models for gas and moisture transport (water vapor diffusivity and moisture permeability) through the porous medium which dictates its long-term durability when used in structural applications. Comparisons of the pore structure with those of a Portland cement paste are also provided. The morphology of the reaction products in the iron-based binder, its elemental composition and the distribution of constituent elements in the microstructure are also reported.

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“…Mercury intrusion porosimetry (MIP) is extensively used to characterize the pore structure in porous material as a result of its simplicity, quickness and wide measuring range of pore diameter 46,47 . MIP provides information about the connectivity of pores 46 .…”

Section: Introductionmentioning

confidence: 99%

“…Before mercury intrusion test, the samples are dried in an oven at about 110 °C until constant weight to remove moisture in the pores. MIP is based on the assumption that the non-wetting liquid mercury (the contact angle between mercury and solid is greater than 90°) will only intrude in the pores of porous material under pressure 46,47 . Each pore size is quantitatively determined from the relationship between the volume of intruded mercury and the applied pressure 47 .…”

Section: Introductionmentioning

confidence: 99%

The Effects of ZnO2 nanoparticles on strength assessments and water permeability of concrete in different curing media

Nazari

Riahi

2011

Mat. Res.

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In this study, the effect of limewater on strength assessments and percentage of water absorption of concrete incorporating ZnO 2 nanoparticles has been investigated. Portland cement was partially replaced by ZnO 2 nanoparticles with the average particle size of 15 nm and the specimens were cured in water and saturated limewater for specific ages. The results indicate that ZnO 2 nanoparticles up to 2.0 weight percent could produce concrete with improved strength and water permeability when the specimens cured in saturated limewater while this content is 1.0 weight percent for the specimens cured in tap water. Although the limewater reduces the strength of concrete without nanoparticles when compared with the specimens cured in water, curing the specimens bearing ZnO 2 nanoparticles in saturated limewater results in more strengthening gel formation around nanoparticles causes improved permeability together with high strength. In addition, ZnO 2 nanoparticles are able to act as nanofillers and recover the pore structure of the specimens by decreasing harmful pores. Accelerated peak appearance in conduction calorimetry tests, more weight loss in thermogravimetric analysis and more rapid appearance of peaks related to hydrated products in X-ray diffraction results, all indicate that ZnO 2 nanoparticles could improve mechanical and physical properties of the specimens.

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Development of technique for observing pores in hardened cement paste

Cited by 104 publications

References 7 publications

The effects of ZnO2 nanoparticles on properties of concrete using ground granulated blast furnace Slag as binder

The effects of ZnO2 nanoparticles on properties of concrete using ground granulated blast furnace Slag as binder

Pore- and micro-structural characterization of a novel structural binder based on iron carbonation

The Effects of ZnO2 nanoparticles on strength assessments and water permeability of concrete in different curing media

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