Studying of salt diffusion behaviour in brick

Ahl, Jori; Lü, Xiaoshu

doi:10.1007/s10853-006-1005-8

Cited by 8 publications

(3 citation statements)

References 17 publications

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“…The effective diffusion coefficients are (6.44 ± 0.59 10 −10 ) m 2 /s and (3.98 ± 0.37 10 −10 ) m 2 /s, for the sand-lime brick and the red brick, respectively. The results obtained in literature [69] for bricks were found to be of the order of (4.5 × 10 −10 ) m 2 /s; they are close to our results.…”

Section: Diffusionsupporting

confidence: 92%

Non-destructive Electrical Methods for Measuring the Physical Characteristics of Porous Materials

2015

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The durability of reinforced concrete structures, built on the seafront, has been at the heart of recent concerns. Indeed, chloride transport across the porosity of concrete coating produces medium to long-term corrosion of reinforcements. This has a direct impact on the mechanical behavior and the ageing of the affected structures. The difficulty of in situ monitoring of these structures, continuously and non-destructively against infiltration of chlorides, is still topical. The work presented here aims mainly at correlating the electrical properties, i.e. electrical resistance, conductivity…, with the physical characteristics (porosity, tortuosity, ...), of granular materials using Archie's law. The recommended experimental program consists in placing, different granular materials, i.e. sand, mortar, bricks, and concretes saturated with electrolytic solutions, in a PVC cell fitted with a pair of stainless steel electrodes connected to an electrical circuit, in order to measure the electrical resistances. The results obtained allow one to determine durability factors, such as the connected porosity and the coefficient of chloride diffusion through a simple measurement of the EC, and estimate the tortuosity parameter that governs transport in porous media.

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Section: Diffusionsupporting

confidence: 92%

Non-destructive Electrical Methods for Measuring the Physical Characteristics of Porous Materials

2015

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“…1. More recent results have largely confirmed these wellestablished trends (Ahl, 2004;Ahl and Lü, 2007;Leaist and Curtis, 1999;Tang, 1999).…”

mentioning

confidence: 59%

Discussion of the Paper "Experimental Investigation into Concentration-Dependent Chloride Diffusivity in Glass Beads and Fine Sand" by K. Prabhakaran Nair, A. Praveen, and S. Chandrakaran

et al. 2009

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The article under discussion deals with the classical topic of electrolyte diffusion in porous media. Special attention is given to the concentration dependence of the effective diffusion coefficient. The findings of the article are, in many ways, rather unusual. First, a concentration dependence far exceeding that reported in the literature is found, and second, the apparent tortuosities are, in most cases, of such a magnitude that their physical meaning must be seriously questioned.

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“…The bricks are appreciated in the entire world, but regrettably many bricks suffer from severe decay, especially those classified as culture heritage. The crystallization of water soluble salts play a main role in the decay in both modern and historical buildings [1][2][3]. The crystallization of salts take place in the pores of porous materials and they increase the pressure on wall of building materials, cause to damage the building materials.…”

Section: Introductionmentioning

confidence: 99%

Electrokinetic Desalination of Compound Building Materials by Applying Electric Field

Yasir¹,

Ayyaz²,

Kamran³

et al. 2021

Adv. Sci. Eng.

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Damaging of building materials is directly connected to the salt crystallization. The present research is based on removal of NaCl from compound building materials, where a direct current (DC) electric field was applied to the mortar plus bricks system. The main objective of this work is to investigate the electrokinetic desalination methodology that can provide sufficient removal of salts. pH neutralization in the surrounding of mortar plus bricks system is crucial to obtain sufficient desalination. For this purpose, the electrodes across the brick were inserted in kaolin clay mixed with buffer agents to suppress the pH changes. Most of the experiments were performed with kaolin clay and sponge. The concentration of chloride ions and sodium ions in all the segments and clay poultice was measured using argentometric titration method and flame photometer, whereas the pH variations in the entire system was measured by using pH indicator papers. The electrokinetic desalination was found to be an efficient method as 86 % removal of chloride and 80 % removal of sodium was achieved.

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Studying of salt diffusion behaviour in brick

Cited by 8 publications

References 17 publications

Non-destructive Electrical Methods for Measuring the Physical Characteristics of Porous Materials

Non-destructive Electrical Methods for Measuring the Physical Characteristics of Porous Materials

Discussion of the Paper "Experimental Investigation into Concentration-Dependent Chloride Diffusivity in Glass Beads and Fine Sand" by K. Prabhakaran Nair, A. Praveen, and S. Chandrakaran

Electrokinetic Desalination of Compound Building Materials by Applying Electric Field

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