Correlation between porosity, permeability and ultrasonic parameters of mortar with variable water / cement ratio and water content

Lafhaj, Zoubeir; Goueygou, M.; Djerbi, Assia; Kaczmarek, Mariusz

doi:10.1016/j.cemconres.2005.11.009

Cited by 287 publications

(117 citation statements)

References 20 publications

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“…The kinetics of reaction of concrete with those agents, hence its durability, is essentially determined by the transfer properties of the cover, i.e. the first few centimeters below the surface of the structure (Goueygou et al, 2009;Lafhaj et al, 2006). The theoretical relationship between ultrasonic propagation and material durability parameters is based on a simple model proposed by .…”

Section: Upv and Porosity Permeability And Densitymentioning

confidence: 99%

“…The ultrasonic test has been used for nondestructive durability assessment to chloride ion penetration (Shkolnik et al, 1997;Udegbunam et al, 1999;Lafhaj et al, 2006). Three ranges of saturation were considered: full saturation (FS) when the water content is more than 85% of the fully saturated specimen; partial saturation (PS) when it is in between 45% and 55%; dry (D) when the saturation is less than 10%.…”

Section: Upv and Porosity Permeability And Densitymentioning

confidence: 99%

See 1 more Smart Citation

Ultrasonic Pulse Velocity Evaluation of Cementitious Materials

Panzera¹,

Christofóro²,

Cota³

et al. 2011

Advances in Composite Materials - Analysis of Natural and Man-Made Materials

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Section: Upv and Porosity Permeability And Densitymentioning

confidence: 99%

Section: Upv and Porosity Permeability And Densitymentioning

confidence: 99%

Ultrasonic Pulse Velocity Evaluation of Cementitious Materials

Panzera¹,

Christofóro²,

Cota³

et al. 2011

Advances in Composite Materials - Analysis of Natural and Man-Made Materials

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“…According to this diagram, the emanation coefficient increases as the water-to-binder ratio increases. In general, the total porosity of concrete increases with the increase of the waterto-binder ratio (Neville, 1995;Lafhaj et al, 2006, Volz et al, 2012. However, increased total porosity does not necessarily imply that radon emanation increases (Ulbak et al, 1984) as the radon emanation is mainly affected by nanoporosity of the prepared concrete (Sas et al, 2015b).…”

Section: Exhalation Measurementmentioning

confidence: 99%

Radiological and material characterization of high volume fly ash concrete

Ignjatović

Sas

Dragaš

et al. 2017

Journal of Environmental Radioactivity

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The main goal of research presented in this paper was the material and radiological characterization of high volume fly ash concrete (HVFAC) in terms of determination of natural radionuclide content and radon emanation and exhalation coefficients. All concrete samples were made with a fly ash content between 50% and 70% of the total amount of cementitious materials from one coal burning power plant in Serbia. Physical (fresh and hardened concrete density) and mechanical properties (compressive strength, splitting tensile strength and modulus of elasticity) of concrete were tested. The radionuclide content ( 226 Ra, 232 Th and 40 K) and radon massic exhalation of HVFAC samples were determined using gamma spectrometry.Determination of massic exhalation rates of HVFAC and its components using radon accumulation chamber techniques combined with a radon monitor was performed. The results show a beneficial effect of pozzolanic activity since the increase in fly ash content resulted in an increase in compressive strength of HVFAC by approximately 20% for the same mass of cement used in the mixtures. On the basis of the obtained radionuclide content of concrete components the I-indexes of different HVFAC samples were calculated and compared with measured values (0.27 -0.32), which were significantly below the recommended 1.0 index value. The prediction was relatively close to the measured values as the ratio between the calculated and measured I-index ranged between 0.89 and 1.14. Collected results of mechanical and radiological properties and performed calculations clearly prove that all 10 designed concretes with a certain type of fly ash are suitable for structural and non-structural applications both from a material and radiological point of view. KeywordsFly ash, Concrete, NORM, I-index, Radon exhalation 1. Introduction BackgroundThe building industry has one of the largest environmental impacts among all human activities:an annual consumption of 10 -11 billion tons of aggregate (Meyer, 2002) and 4.18 billion tons of cement (USGS, 2015). Apart from extremely high resource and energy consumption, cement production is a significant source of CO2 emissions, accounting for approximately 4.4% of global CO2 emissions from industry in 2007(Boden et al., 2010.There are many ideas that have been proposed to make concrete "greener" and more sustainable but they are all based on two principles: reuse and reduce. Concepts based on the "reduce" principle are oriented towards decreasing cement production based on natural materials and result in a reduction in CO2 emissions. With respect to the requirements for concrete as the world's most used man-made material, a lower production of Ordinary Portland cement must be compensated with alternative sources of binders in concrete production. There are several industrial sectors which produce significant amounts of residues such as fly ash (FA), bottom ash, red mud, steel slag, nonferrous slag, etc. which can be used for that purpose (Shi et al., 2006).Millions of tons of FA,...

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“…Addition of a 20 high proportion of glass fibres to the mortar matrix (3% − 5% by weight of mortar) improves the mechanical properties of the elements formed with this material, specially the toughness and ductility. This composite has an important role in non-steel reinforced pre-cast concrete elements such as sheets, panels and other slim shapes usually employed in building engineering and architecture, and also in cast-in-situ sprayed-on surfaces [1,2].…”

Section: Introductionmentioning

confidence: 99%