The influence of different drying methods on cement paste microstructures as reflected by gas adsorption: Comparison between freeze-drying (F-drying), D-drying, P-drying and oven-drying methods

Korpa, Arjan; Trettin, R.

doi:10.1016/j.cemconres.2005.11.021

Cited by 176 publications

(75 citation statements)

References 19 publications

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“…Previous studies have pointed out that the capillary pressure due to surface tension of the removed water caused by oven-drying at high temperature causes the collapse of small pores such as gel pores in C-S-H (Juenger et al 2001;Korpa et al 2006;Snoeck et al 2014). Compared with other drying methods, the oven drying method causes the specific surface area decrease owing to the collapse of small pores as the result of capillary pressure.…”

Section: Specific Surface Area Of Cement Pastementioning

confidence: 99%

Relation between Chemical Composition and Physical Properties of C-S-H Generated from Cementitious Materials

Suda

Saeki

Saito

2015

ACT

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Calcium silicate hydrate (C-S-H) is a dominant hydration product of cementitious materials. Therefore, its chemical composition and physical properties affect the performance of concrete. The purpose of this study is to investigate the chemical composition (CaO/SiO 2 molar ratio (Ca/Si ratio), and H 2 O/SiO 2 molar ratio (H 2 O/Si ratio)) and physical properties, such as density and specific surface area, of C-S-H. These factors are measured using synthesized C-S-H samples and C-S-H generated from various cementitious materials. Experimental results show that the H 2 O/Si ratio of C-S-H is proportional to the Ca/Si ratio independent of the mix proportion, curing temperature and type of binder. The density and specific surface area of C-S-H are affected by its Ca/Si ratio. A linear relationship is observed between the Ca/Si ratio and density of C-S-H independent of the mix proportion, curing temperature and type of binder. An inversely proportional relationship is found between the Ca/Si ratio and specific surface area of C-S-H.

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Section: Specific Surface Area Of Cement Pastementioning

confidence: 99%

Relation between Chemical Composition and Physical Properties of C-S-H Generated from Cementitious Materials

Suda

Saeki

Saito

2015

ACT

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“…The samples were flash frozen in glass tubes in liquid nitrogen and then freeze dried using a vacuum system at liquid nitrogen temperatures in order to maintain their morphology for SEM examination. This method has been shown to best preserve sample morphology during drying 25,26 . Fourteen to sixteen different grains were then imaged for each sample time at 1.2 kV accelerating voltages, 2.8 mm working distance and 7 μA using a FEG-SEM.…”

Section: Methodsmentioning

confidence: 99%

Growth of Cement Hydration Products on Single‐Walled Carbon Nanotubes

Makar

Chan

2009

Journal of the American Ceramic Society

323

112

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1111/j. 1551-2916.2009.03055.x Journal of the American Ceramic Society, 92, 6, pp. 1303Society, 92, 6, pp. -1310Society, 92, 6, pp. , 2009 Growth of cement hydration products on single walled carbon nanotubes Makar, J. M.; Chan, G. W. The material in this document is covered by the provisions of the Copyright Act, by Canadian laws, policies, regulations and international agreements. Such provisions serve to identify the information source and, in specific instances, to prohibit reproduction of materials without written permission. For more information visit http://laws.justice.gc.ca/en/showtdm/cs/C-42Les renseignements dans ce document sont protégés par la Loi sur le droit d'auteur, par les lois, les politiques et les règlements du Canada et des accords internationaux. Ces dispositions permettent d'identifier la source de l'information et, dans certains cas, d'interdire la copie de documents sans permission écrite. Pour obtenir de plus amples renseignements : http://lois.justice.gc.ca/fr/showtdm/cs/C-42 Growth of Cement Hydration Products on Single Walled Carbon Nanotubes AbstractSingle walled carbon nanotubes (SWCNT) were distributed on the surface of ordinary Portland cement (OPC) grains. The OPC/SWCNT composite was then hydrated at a 0.5 w/c ratio. The effects of the SWCNT on the early hydration process were studied using isothermal conduction calorimetry, high resolution scanning electron microscopy and thermogravimetric analysis. The observed behaviour of the composite samples was compared to both OPC sonicated without SWCNT and previously published data on as-delivered OPC. The SWCNT were found to accelerate the hydration reaction of the C 3 S in the OPC. The morphology of both the initial C 3 A and the C 3 S hydration products were found to be affected by the presence of the SWCNT. In particular, the nanotubes appeared to act as nucleating sites for the hydration products, with the nanotubes becoming rapidly coated with C-S-H. The resulting structures remained on the surface of the cement grains while those in the sonicated and as-delivered OPC samples grew out from the grain surfaces to form typical C-S-H clusters. Classical evidence of reinforcing behaviour, in the form of fiber pullout of the SWCNT bundles, was observed by 24 hours of hydration.

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“…6, Top) were of type H3 according to the IUPAC classification [20]. Since there was no indication of plateau at high P/P 0 , the isotherms should not be classified as Type IV, but as Type IIb [20,44]. This kind of isotherms are the result of interparticle capillary condensation, suggesting materials composed of aggregates of particles giving rise to slit-shaped pores [20,45], which copes well with the morphology of our materials as shown in Fig.…”

Section: Porosity At the Nanoscale: Characterization By Nitrogen Sorpmentioning

confidence: 87%

“…No change in the microstructure was observed by SEM after drying. While it is true that the drying step has been shown to have an impact on pore structure in some cementitious materials that contain a gel-like phase, like Portland cement [44], the situation is expected to be rather different in the CPCs analysed in this work, where the drying step at 100ºC is expected to cause only the loss of the surface-bound water in the calcium deficient hydroxyapatite obtained as the reaction product [46,47].…”

Section: Porosity At the Nanoscale: Characterization By Nitrogen Sorpmentioning

confidence: 97%

Multiple characterization study on porosity and pore structure of calcium phosphate cements

2015

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Being able to thoroughly characterize the intricate pore structure of calcium phosphate cements is a key step to successfully link the structural properties of these synthetic bone grafts with their most relevant properties, such as in vitro or in vivo behaviour, drug loading and release properties or degradation over time. This is a challenging task, due to the wide range of pore sizes compared to most other ceramic biomaterials. This work provides a critical assessment of three different techniques based on different physical phenomena, namely Mercury Intrusion Porosimetry (MIP), Nitrogen sorption and Thermoporometry (TPM) for the detailed characterization of four calcium phosphate cements with different textural properties, in terms of total porosity, Pore Size Distribution (PSD) and Pore Entrance Size Distribution (PESD). MIP had the advantage of covering a much wider size range than TPM and Nitrogen sorption, offering a more comprehensive information at the micrometric level. TPM, and specially Nitrogen sorption, besides being non-destructive techniques, and although covering a limited size range, provided complementary information regarding pore structure associated to crystal shape at the nanoscale, recording both PSD and PESD in a single experiment. MIP tended to register smaller sizes, especially at low L/P ratios, due to the network effect, that has a strong influence on the outcome of this technique.¡

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The influence of different drying methods on cement paste microstructures as reflected by gas adsorption: Comparison between freeze-drying (F-drying), D-drying, P-drying and oven-drying methods

Cited by 176 publications

References 19 publications

Relation between Chemical Composition and Physical Properties of C-S-H Generated from Cementitious Materials

Relation between Chemical Composition and Physical Properties of C-S-H Generated from Cementitious Materials

Growth of Cement Hydration Products on Single‐Walled Carbon Nanotubes

Multiple characterization study on porosity and pore structure of calcium phosphate cements

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