Non-steady-state chloride diffusion coefficients obtained from migration and natural diffusion tests. Part I: Comparison between several methods of calculation

Andrade, Carmen; Castellote, Marta; Alonso, C.; González, Carlos E.

doi:10.1007/bf02481692

Cited by 48 publications

(18 citation statements)

References 8 publications

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“…Prior to all permeation testing, initial conditions of samples must satisfy certain requirements as specified in classical theories [14,15]. Drying is an unavoidable preconditioning procedure for gas permeability [11,16], gas adsorption [17], gas diffusion [18] and water absorption [19,20].…”

Section: Introductionmentioning

confidence: 99%

Establishment of a preconditioning regime for air permeability and sorptivity of alkali-activated slag concrete

Yang

Chen

Magee

et al. 2016

Cement and Concrete Composites

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This study reports an experimental investigation designed to assess the influence of near-surface moisture contents on permeation properties of alkali-activated slag concrete (AASC). Five different drying periods (5, 10, 15, 20 and 25 days) and three AASC and normal concretes with compressive strength grades ranging from C30 to C60 were considered. Assessment of moisture distribution was achieved using 100 mm diameter cores with drilled cavities. Results indicate that air permeability of AASC is very sensitive to the moisture content and its spatial distribution, especially at relative humidity above 65%. To control the influence of moisture on permeation testing, the recommendation of this paper is that AASC specimens should be dried in controlled conditions at 40 o C for 10 days prior to testing. It was also concluded from this study that AASC tends to perform less well, in terms of air permeability and sorptivity, than normal concrete for a given strength grade. This conclusion reinforces the need to further examine AASC properties prior to its widespread practical use.

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Section: Introductionmentioning

confidence: 99%

Establishment of a preconditioning regime for air permeability and sorptivity of alkali-activated slag concrete

Yang

Chen

Magee

et al. 2016

Cement and Concrete Composites

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“…In part I of this paper [1], results corresponding to natural diffusion tests in non-steady state, D-NS, in different experimental conditions and for several dosages were presented. Compositions of the concretes named as A, B and J are given again in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…Three series of natural diffusion tests in non-steadystate, D-NS, varying the testing time and the chloride concentration respectively, were carried out (collected in Table 2): 1) In concretes A, B and J, a series of natural diffusion tests was performed. The experimental conditions were: 0.5 M NaC1 during 90 days and 3 M NaC1 during 35 days.…”

Section: Natural Diffusion In Different Conditionsmentioning

confidence: 99%

“…In part I of this paper [1], the need of clarification and modeling the penetration of chlorides was proposed, as it was shown that, even when only natural diffusion is involved, different experimental conditions in nonsteady state lead to different diffusion coefficients. When migration experiments (with applied electrical field) are used, additional complexity is introduced, which makes the problem of obtaining realistic values, very difficult to be solved.…”

Section: Introductionmentioning

confidence: 99%

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Non-steady-state chloride diffusion coefficients obtained from migration and natural diffusion tests. Part II: Different experimental conditions. Joint relations

2001

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A B S T R A C T R I~ S U M !~The complexity of the process of chloride penetration in concrete makes it difficult to define a standard procedure in order to calculate diffusion coefficients. In this paper, an attempt to find joint relations between coefficients calculated from different procedures is made. As a first step, an empirical relation, that allows the conversion of a diffusion coefficient calculated from any experimental conditions to a reference condition (0.5 M NaC1 and 90 days of duration of the test), has been developed and validated with different natural diffusion tests. This relation enables the comparison between different non-steady-state diffusion coefficients. As a second step, the equivalence between migration and natural diffusion tests has been undertaken from different series of migration tests, in steady and nonsteady-state, conditions. The final results have been presented in a graphical form in order to facilitate their application. La complexitd des procedures de pdndtration des chlorures clans le b&on rend di~cile la d~finition d'une proce-

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“…Furthermore several test methods for obtaining chloride (C1-) diffusion coefficients in nonsteady-state conditions are based on fitting the experimental C1-content profile to a particular equation [1].…”

Section: Introductionmentioning

confidence: 99%

Bit shape geometric considerations when sampling by dry drilling for obtaining chloride profiles in concrete

Climent¹,

Almenar²,

Viqueira³

2001

Mat. Struct.

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When obtaining dust concrete samples by dry drilling to determine chloride content profiles, the common conical shape of the bit tip induces some problems for assigning the analyzed C1-content of each sample to a fixed depth from surface, (which is necessary for applying C1-transport models): the amount of concrete removed is not the same throughout the length of a single drilling step, and concrete coming from depths lower than the nominal drilling step is also obtained. It is proposed that each C1-concentration in the profile should be assigned to the gravity centre of the solid sample really removed in each drilling step, instead of assigning it to the centre of the nominal drilling step. A simple method for calculating the gravity centre of each sample obtained by dry drilling, has been developed. The calculated values of C1-diffusion coefficients from a C1-content profile may be appreciably lower if the centres of gravity of the samples, instead of the centres of the nominal drilling steps, are used for the calculations.

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Non-steady-state chloride diffusion coefficients obtained from migration and natural diffusion tests. Part I: Comparison between several methods of calculation

Cited by 48 publications

References 8 publications

Establishment of a preconditioning regime for air permeability and sorptivity of alkali-activated slag concrete

Establishment of a preconditioning regime for air permeability and sorptivity of alkali-activated slag concrete

Non-steady-state chloride diffusion coefficients obtained from migration and natural diffusion tests. Part II: Different experimental conditions. Joint relations

Bit shape geometric considerations when sampling by dry drilling for obtaining chloride profiles in concrete

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