Capillary transport in mortars and concrete

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WebOct 9, 2013 · Water is often added to concrete placing for easy workability and finishability in construction site. The additional mixing water can help easy mixing and workability but causes increased porosity, which yields degradation of durability and structural performances. In this paper, cement mortar samples with 0.45 of W/C (water to cement) … WebMay 1, 1997 · Transport processes are foremost controlled by the material's porosity. Cementitious materials, such as concrete and mortars, exhibit distinct changes in …

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WebFeb 26, 2003 · Martys N S and Ferraris C F 1997 Capillary transport in mortars and concrete Cement Concrete Res. 27 747-60. Crossref; Google Scholar McCarter W J, Ezirim H and Emerson M 1996 Properties of concrete in the cover zone: water penetration, sorptivity and ionic ingress Magazine Concrete Res. 48 149-56. Crossref; Google Scholar WebSep 24, 2024 · The durability of mortar/concrete is strongly influenced by its aptitude to transport aggressive agents through the connected porosities (Mobili et al. 2016). ... by different mortars and the capillary water absorption coefficient (C). A significant variation in capillary water absorption is recorded only in 100% glass cullet mortars where the ... sky\u0027s the limit challenge ct 2022

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WebIn mortar (and concrete) samples, gypsum also forms in the interfacial transition zone between paste bulk and aggregates. At 1 mm depth the phase composition in the exposed sample is similar to that of the reference sample (stored in pore solution) (shown at the centre of Fig. 6 (f)) and indicates the depth of penetration of the sulfate ... WebMay 1, 2006 · Compared with the diffusion of aggressive ions within a saturated solution driven by the ionic concentration gradients, water transport induced by capillary or hydraulic force can allow for much ... WebAug 9, 2024 · In actual engineering, most concrete structures are unsaturated, and the transport of harmful media in concrete highly depends on its saturation degree. In this … sky\u0027s the limit ct

Influence of Pore Structure on Compressive Strength of Cement Mortar

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WebJan 1, 2011 · Many aspects of concrete durability and performance are influenced by moisture conditions in concrete. Although the importance of moisture effect on concrete pavement has been widely recognized, moisture deformations and stresses were usually ignored in pavement analysis because of a lack of comprehensive understanding of … WebMay 22, 2024 · Capillary transport in mortars and concretes, Cem.Concr.Res, 27:747-760. 16. Neville, A. M. (1995). ... Samples taken from various mortar, pure paste and … sky\u0027s the limit elizabethtownWebCapillary Transport in Mortars and Concrete. where S is the sorptivity.. For the case of a vertical tube in a gravitational field the meniscus will reach an equilibrium height, h ∞, given by h ∞ = 2 γ ab cosθ / (r ρ g) where g is the gravitational constant. For a tube of radius 1 micrometer (a typical size of the larger capillary pores in many concretes), and γ ab ≈ … sky\u0027s the limit challenge ct

"WebNov 4, 2016 · We investigated the effects of hydrogen-rich water (HRW) on the strength and durability of Portland cement mortars. We comparatively assessed the performances of HRW-based mortars (HWMs) with respect to cement mortars fabricated from control water (CWM). The results indicate that the use of HRW significantly improves the compressive, … " - Capillary transport in mortars and concrete

Capillary transport in mortars and concrete

WebResults are presented of a study concerning capillary transport of water in concretes and mortars as a function of water/cement ratio, sand size distribution, and curing. Our studies indicate that the capillary sorption (1) of water in concrete exhibits a … WebMay 1, 2006 · Compared with the diffusion of aggressive ions within a saturated solution driven by the ionic concentration gradients, water transport induced by capillary or …

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WebJan 1, 2010 · Because conventional concrete is brittle and tends to crack easily under mechanical and environmental loads, there are concerns with durability. ... Martys N. S., and Ferraris C. F. Capillary Transport in Mortars and Concrete. Cement and Concrete Research, Vol. 27, No. 5, 1997, pp. 747–760. Crossref. WebJun 26, 2024 · Hanžič et al. obtained the capillary coefficient of concrete using NR and calculated the ratio between S and k, however, it is only an experiment result and a …

WebJan 1, 1997 · Abstract. Results are presented of a study concerning capillary transport of water in concretes and mortars as a function of water/cement ratio, sand size … WebJul 20, 2024 · This chapter covers the transport properties of mortar and concrete, starting with the basic hard core soft shell microstructure model, and then building up to …

http://ciks.cbt.nist.gov/~garbocz/captrans/node9.html WebAir permeability measurements according to the Hagen–Poiseuille equation, Scanning Electron Microscopy (SEM) and mercury intrusion porosimetry (MIP) tests were …

WebDec 6, 2024 · This study intends to access the influence of the capillary action on electrical property of the concrete containing the coal gangue ceramsite. For this purpose, four kinds of concrete samples were prepared; the coal gangue ceramsite was adopted at four volume ratios of 0%, 30%, 60%, and 100%, respectively. The …

The capillary absorption of water in unsaturated concrete plays a critical role … An improved formula for the dependence of diffusivity on pore humidity is proposed. … ELSEVIER Journal of Chromatography A, 707 (1995) 35-43 JOURNAL OF … Read the latest articles of Cement and Concrete Research at … sky\u0027s the limit hallmark ornament seriesWebThe capillary water absorption was modeled using the Richard's equation and proper initial and boundary conditions. It was considered that all surfaces in contact with free water … sky\u0027s the limit lyricsWebdiffusion numerical model of chloride transport was constructed. 2 Theory of chloride transport in unsaturated cement-based materials Chloride transport in unsaturated cement-based mate-rials includes two parts: (1) diffusion by the concen-tration gradient and (2) convection by the capillary suction effect [34, 35]. The chloride transport ﬂux in sky\u0027s the limit diner tyler txWebResults in this section concerning capillary transport in a tube were taken from A.W. Adamson, Physical Chemistry of of Surfaces, second edition, Interscience Publishers, … sky\u0027s the limit etownWebNevertheless, for conditions where concrete is not fully immersed in water, the sorptivity (and not the permeability) characterizes the transport of water in porous materials by capillary suction forces and (since non-swelling soils are present) the general Darcy's law can be simplified to the Richard's equation taking into account the mass ... sky\u0027s the limit hiking challenge 2022WebJun 11, 2024 · Results are presented of a study concerning capillary transport of water in concretes and mortars as a function of water/cement ratio, sand size distribution, and curing. Our studies indicate that the capillary sorption (1) of water in concrete exhibits a complex time dependence. At early times, of the order of one hour, the total water uptake … sky\u0027s the limit marketing reviewsWebNov 11, 2024 · The mortar usually used in Venice is a mixture of lime, water, and fine aggregates (such as sand and minced marble) as well as other additives in proportion, to eventually guarantee the workability and mechanical resistance. ... the scope was to investigate one of the principal mechanisms of moisture transport in porous materials: … sky\u0027s the limit mark ambor chords