A durability performance-index for concrete: developments in a novel test method

McCarter, William John; Chrisp, T. M.; Starrs, G.; Basheer, Pam; Srinivasan, Srikant; Magee, Bryan

doi:10.1504/ijstructe.2015.067966

Cited by 9 publications

(3 citation statements)

References 16 publications

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“…A fully saturated condition is difficult to reach and, hence, the samples were immersed for 50 days (leaving one surface exposed to surface) and the resistance was measured to obtain Ro. For the value of 'm', it is generally in the range of 1.5 to 3 [23] and a middle value, 2, was used in this case. Figure 6 shows the saturation degree for the different conditions, viz.…”

Section: Requirements To Obtain Reliable Water Permeability Resultsmentioning

confidence: 99%

Effectiveness of two field methods of saturating near surface concrete on the water permeability of in situ concrete

Yang¹,

Basheer²,

Nanukuttan³

et al. 2019

MATEC Web Conf.

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Determining the water permeability of concrete in structures remains a challenge because of difficulties in removing the influence of its moisture content. Saturating concrete with water could be one option, but this is not easy to achieve on site. This paper reports a testing programme carried out to assess the reliability and effectiveness of two field saturation methods, viz. vacuum saturation and ponding. The water permeability test results after applying the vacuum saturation and ponding were compared with that obtained after incremental immersion. It was found that ponding was unable to remove the influence of moisture, whilst vacuum saturation was effective for wet concretes. The results obtained from the electrical resistance measurements after incremental immersion suggested that the water permeability of concretes can be accurately determined by carrying out in situ permeability tests if the near surface region up to a depth of 25 mm is fully saturated.

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Section: Requirements To Obtain Reliable Water Permeability Resultsmentioning

confidence: 99%

Effectiveness of two field methods of saturating near surface concrete on the water permeability of in situ concrete

Yang¹,

Basheer²,

Nanukuttan³

et al. 2019

MATEC Web Conf.

Self Cite

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show abstract

“…To provide a further direct measure of the ability of the concrete mixes to resist chloride ingress, the diffusivity of the concretes is discussed. As the solid phase in the concrete can be regarded as non-conductive in comparison to that of the pore-fluid, diffusivity and ionic conductivity of a saturated porous material are connected through the Nernst-Einstein relationship (Lu 1997;Tumidajski et al 1996;McCarter et al 2015c);…”

Section: Formation Factor and Diffusionmentioning

confidence: 99%

“…For clarity, Fig. 12(a displays the relationship between the instantaneous and the effective diffusion coefficient, D i and D eff , respectively, which can be related through the following relationship (Pack et al 2010;McCarter et al 2015c…”

Section: Formation Factor and Diffusionmentioning

confidence: 99%

Assessing the Performance and Transport Properties of Concrete using Electrical Property Measurements

Suryanto

Kim

McCarter

et al. 2020

ACT

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The electrical properties of porous systems are intimately linked to mass transport and flow processes such as diffusion and permeability and offer a simple testing methodology for assessing those properties which are responsible for the durability and long-term performance of construction materials. In the current study, electrical impedance spectra for concretes containing both plain and blended Portland cement binders were obtained over a period of 360 days. In-situ impedance measurements were used to accurately identify the bulk resistance (hence evaluation of resistivity) of the concretes and the optimum frequency range for bulk resistance measurements. The bulk resistivity was normalised by that of the pore-fluid resistivity obtained from computer simulations and the results indicated that the pore-fluid resistivity decreased only marginally with time once the hydration process had advanced beyond 28 days. It is shown that the normalised resistivity-termed the Formation Factor-displayed a continual increase with time, highlighting ongoing hydration/pozzolanic reaction and pore structure refinement over the entire test period. This was particularly evident for the slag concretes. Using the normalisation process, a simple approach is presented to evaluate the effective diffusion coefficient of the concretes and a durability/performance classification system, based on the Formation Factor, is presented.

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Electrochemical aspects of the steel‐concrete system. A review

Nóvoa

2016

J Solid State Electrochem

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A durability performance-index for concrete: developments in a novel test method

Cited by 9 publications

References 16 publications

Effectiveness of two field methods of saturating near surface concrete on the water permeability of in situ concrete

Effectiveness of two field methods of saturating near surface concrete on the water permeability of in situ concrete

Assessing the Performance and Transport Properties of Concrete using Electrical Property Measurements

Electrochemical aspects of the steel‐concrete system. A review

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