Examination of three methods for studying ion diffusion in cement pastes, mortars and concrete

Buenfeld, N.R.; Newman, John B.

doi:10.1007/bf02472720

Cited by 76 publications

(22 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In the last years, research work on the chloride penetration into concrete has shown that neither the diffusion coefficient nor the surface chloride concentration remain constant over time [10][11][12][13][14]. Therefore, if constant D and Cs are used, gross errors can be made by using Equation (2) for long term predictions.…”

Section: Chloride Penetrationmentioning

confidence: 99%

Chloride penetration into concrete in marine environment—Part I: Main parameters affecting chloride penetration

1999

View full text Add to dashboard Cite

A B ST R ACT R (_--S U MThe durability of concrete structures exposed to marine environment depends mainly on the ability of concrete to resist to chloride ingress. This complex phenomenon depends on many parameters related to the concrete properties and to the micro-environmental characteristics. This paper presents the results of an experimental study where fifty four 1.0 x 0.5 x 0.12 m concrete panels were exposed to marine environment for three to five years. A study of three concrete mixes in five different exposure conditions was conducted and the results show that the chloride penetration is strongly dependent on both the concrete quality and the exposure conditions. Both the diffusion coefficients D and the surface chloride concentration Cs derived from the chloride profiles show a clear time dependence. This effect has serious implications for long term predictions of chloride penetration, therefore if constant values of D and Cs are assumed gross errors can be made. La durabilitd des structures en bdton soumises a l'envi-

show abstract

Section: Chloride Penetrationmentioning

confidence: 99%

Chloride penetration into concrete in marine environment—Part I: Main parameters affecting chloride penetration

1999

View full text Add to dashboard Cite

show abstract

“…Parameters C 1 and n were obtained by applying equation (3) to the experimental results presented in [8]. Table 2 shows the values of C 1 and n for the various concrete mixes and exposure conditions.…”

Section: Time Dependence Of the Chloride Diffusion Coefficientsmentioning

confidence: 99%

“…However recent experimental studies [3][4][5][6][7] have shown that these parameters are strongly time dependent. Thus, it is very important to study the relation between such parameters and time for different exposure conditions in order to obtain more precise models.…”

Section: Introductionmentioning

confidence: 98%

Chloride penetration into concrete in marine environment-Part II: Prediction of long term chloride penetration

1999

View full text Add to dashboard Cite

A B S T R A C T R I~ S U M I~The development of chloride penetration models is essential for the assessment of the service life of concrete structures exposed to marine environment. Simple models derived from Pick's second law of diffusion are at present the best way to predict the chloride penetration in practical situations. However these models need to be calibrated with experimental results. This paper presents an experimental study where the parameters used in the penetration model were calibrated to allow the prediction of long wrm chloride content in concrete. The results showed that both the concrete cover and concrete quality requirements stated in the present codes need to be increased so that an acceptable service life can be achieved. Le ddveloppement de modules sur la pdndtration des chlo-

show abstract

“…McCarter et al (2000) reported that the electrical conductivity and permeability and the diffusion coefficient of mortar showed a good correlation, which shows the relationship between the electrical conductivity and other properties of cement-based materials. In addition, there have been many studies investigating the correlation between the electrical conductivity and other properties of concrete (Andrade 1993;Streicher and Alexander 1995;Sánchez et al 2011;Ortega et al 2012;Shi et al 1999;Díaz et al 2006;Mercado et al 2012;Buenfeld and Newman 1987;Shane et al 2000;Vedalakshmi et al 2008;Neithalath and Jain 2010;Minagawa et al 2010). However, most studies have investigated limited ranges of water to cement ratios (W/C 0.4-0.6), and the relationship between the porosity and conductivity of mortar or concrete, which includes the effect of the interfacial transition zone (ITZ), was established as shown in Table 1.…”

Section: Introductionmentioning

confidence: 99%

Electrical Conductivity and Chloride Ingress in Hardened Cement Paste

Kurumisawa

Nawa

2016

ACT

View full text Add to dashboard Cite

The transport properties of hardened cement paste (HCP) have been investigated in many studies; the AC impedance method (ACI) is a non-destructive technique employed for this purpose and has been used in investigations of the electrical characteristic and mass transport properties of HCP. However, there are relatively fewer studies investigating chloride ingress in HCP and using the ACI. In this study, the relationship between the electrical conductivity measured by the ACI and chloride ingress was investigated. Backscattered electron image analysis and mercury intrusion porosimetry and water porosity were used to measure the pore structure of HCP, and the chloride ingress depth was measured by an electron probe microanalyzer. There was a high correlation between the porosity and conductivity and between the conductivity and diffusion coefficient of the chloride ions in HCP. This implies that the diffusion coefficient of chloride ions could be estimated by the conductivity measurements.

show abstract

Examination of three methods for studying ion diffusion in cement pastes, mortars and concrete

Cited by 76 publications

References 5 publications

Chloride penetration into concrete in marine environment—Part I: Main parameters affecting chloride penetration

Chloride penetration into concrete in marine environment—Part I: Main parameters affecting chloride penetration

Chloride penetration into concrete in marine environment-Part II: Prediction of long term chloride penetration

Electrical Conductivity and Chloride Ingress in Hardened Cement Paste

Contact Info

Product

Resources

About