Evaluation of chloride and water penetration in concrete with cement containing limestone and IPA

Ibrahim, Mustapha; Issa, Mohsen A.

doi:10.1016/j.conbuildmat.2016.10.085

Cited by 14 publications

(14 citation statements)

References 15 publications

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“…The concrete permeability test results obtained using a syringe pump at a constant level of hydraulic head were taken as reference values. The values found are comparable to those of other studies, despite some variations [ 7 , 35 ]. A direct relationship between porosity and permeability has been introduced by some researchers [ 4 , 38 , 52 , 53 , 54 , 55 , 56 , 57 , 58 ].…”

Section: Discussionsupporting

confidence: 90%

“…It is believed that in non-saturated medium (partially saturated concrete), the water penetration under external hydraulic pressure is associated with sorptivity and unsteady flow [ 7 , 8 , 35 , 36 ]. Thus, this method can quantify the transport under pressure gradient and can possibly assess permeability (in the non-stationary regime).…”

Section: Research Materials and Testing Methodsmentioning

confidence: 99%

“…Hedegaard and Hansen [ 37 ] expressed d as the maximum penetration depth. Ibrahim and Issa [ 35 ] proposed to estimate the penetration coefficient based on the average depth instead of the maximum depth of penetration. Then, Equation (1) can be expressed as follows:

where C is the ratio of the d avg to d max .…”

Section: Research Materials and Testing Methodsmentioning

confidence: 99%

“…Then, Equation (1) can be expressed as follows:

where C is the ratio of the d avg to d max . The average depth of penetration d avg is calculated by first measuring the area A w and maximum width w max of the wetted region for the two split sections using CAD software [ 35 ]. Then, d avg is taken as the average of the A w divided by w max for each half.…”

Section: Research Materials and Testing Methodsmentioning

confidence: 99%

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An Experimental Assessment of the Water Permeability of Concrete with a Superplasticizer and Admixtures

2020

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This study presents a flow pump technique usually used for evaluating the permeability of soils, which was, for first time, applied to measure the water permeability of concrete. Additionally, a new easy-to-apply method to determine permeability is proposed, based on a modification of Valenta’s formula. In the calculations, the apparent air content of concrete mixes was taken into account. An additional purpose of the conducted research was to determine the influence of a new generation of polycarboxylate superplasticizer and chemically active admixtures on the permeability, compressive strength, and other properties of concrete. The following four types of concrete were tested: concrete without admixtures, concrete with an admixture to increase the compressive strength, concrete with a superplasticizer, and concrete containing two admixtures simultaneously. The results showed that the proposed method allows to obtain reliable measurements within a very short period of time. The obtained results confirmed that new method may be very useful in engineering practice, particularly in terms of the watertightness of hydrotechnical concretes and the properties of the concretes used in bridge construction, underground parts of office buildings, or sealed tanks.

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Section: Discussionsupporting

confidence: 90%

Section: Research Materials and Testing Methodsmentioning

confidence: 99%

where C is the ratio of the d avg to d max .…”

Section: Research Materials and Testing Methodsmentioning

confidence: 99%

“…Then, Equation (1) can be expressed as follows:

Section: Research Materials and Testing Methodsmentioning

confidence: 99%

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An Experimental Assessment of the Water Permeability of Concrete with a Superplasticizer and Admixtures

2020

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“… 14 – 16 In clinic, precipitation of calcium carbonate was shown to promote catheter colonization, active infection and interspecies interactions. 8 , 10 , 11 In this context it is important to note that diffusion of simple small molecules in calcite is reduced by several orders of magnitude compared with their diffusion in a polysaccharide gels and fibers, 17 – 20 and this is very likely to be true also for antibiotics. Therefore, development of sensitive and accurate methods to measure 3D distribution of calcium carbonate in biofilms in their natural setting is of high importance, and may allow to predict the efficacy of antibiotic penetration and the success of antibiotic treatment.…”

Section: Introductionmentioning

confidence: 99%

Micro-CT X-ray imaging exposes structured diffusion barriers within biofilms

Keren-Paz

Brumfeld

Oppenheimer-Shaanan

et al. 2018

npj Biofilms Microbiomes

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In nature, bacteria predominantly exist as highly structured biofilms, which are held together by extracellular polymeric substance and protect their residents from environmental insults, such as antibiotics. The mechanisms supporting this phenotypic resistance are poorly understood. Recently, we identified a new mechanism maintaining biofilms - an active production of calcite minerals. In this work, a high-resolution and robust µCT technique is used to study the mineralized areas within intact bacterial biofilms. µCT is a vital tool for visualizing bacterial communities that can provide insights into the relationship between bacterial biofilm structure and function. Our results imply that dense and structured calcium carbonate lamina forms a diffusion barrier sheltering the inner cell mass of the biofilm colony. Therefore, µCT can be employed in clinical settings to predict the permeability of the biofilms. It is demonstrated that chemical interference with urease, a key enzyme in biomineralization, inhibits the assembly of complex bacterial structures, prevents the formation of mineral diffusion barriers and increases biofilm permeability. Therefore, biomineralization enzymes emerge as novel therapeutic targets for highly resistant infections.

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Influence of Pumice and Metakaolin on Compressive Strength and Durability of Concrete in Acidic Media and on Chloride Resistance under Immersion and Tidal Conditions

Samimi

Farahani²,

Pakan

et al. 2021

Iran J Sci Technol Trans Civ Eng

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Evaluation of chloride and water penetration in concrete with cement containing limestone and IPA

Cited by 14 publications

References 15 publications

An Experimental Assessment of the Water Permeability of Concrete with a Superplasticizer and Admixtures

An Experimental Assessment of the Water Permeability of Concrete with a Superplasticizer and Admixtures

Micro-CT X-ray imaging exposes structured diffusion barriers within biofilms

Influence of Pumice and Metakaolin on Compressive Strength and Durability of Concrete in Acidic Media and on Chloride Resistance under Immersion and Tidal Conditions

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