Influence of the age on air permeability of concrete

Sanjuán, Miguel Ángel; Muñoz-Martialay, R.

doi:10.1007/bf00356701

Cited by 28 publications

(9 citation statements)

References 6 publications

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“…Many researchers used the air permeability to assess the permeability of concrete [29,30]. In this paper, the methanol method was adopted to evaluate the porosity of connected voids in the mortar specimen [31].…”

Section: Methodsmentioning

confidence: 99%

The Influence of Water/Cement Ratio and Air Entrainment on the Electric Resistivity of Ionically Conductive Mortar

et al. 2019

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Ionically-conductive mortar can be used for indoor radiant heating partition walls. In these applications, mortar blocks are soaked in electrolyte solutions of CuSO4. The surfaces of the block are coated with sealant and epoxy resin afterwards to prevent evaporation. The mortar block becomes a heating element due to ionic conduction if a voltage is applied to the electrodes in the block. Its electrical conductivity depends on the dispersion of the electrolyte, and hence on the porosity of the mortar. The test specimens in this study were divided into four groups according to the different air entrainment agents, including aluminum powder and hydrogen peroxide as well as two air-entraining agents, SJ-2 and K12. Each group was manufactured with water/cement ratios in the range of 0.5 to 0.9. The test results showed that the conductivity of the mortar was strongly influenced by the air-entrainment and the water cement ratios. The volumetric electric resistivity and the associated microstructures of the mortar were investigated. The test results showed that the specimens made with aluminum powder and a water–cement ratio of 0.65–0.75 had high porosity. The porosity of those specimens was further increased by adding two different air-entraining agents. The specimens with aluminum powder and SJ-2, along with a water–cement ratio of 0.7 appeared to be the optimum mixture. Its resistivity was 19.37 Ω·m at 28 days under 25.31% porosity. The experimental results indicate that an ionically-conductive mortar can be produced by combining different air-entrainment agents with variable water-cement ratios to meet a specified electrical heating requirement.

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Section: Methodsmentioning

confidence: 99%

The Influence of Water/Cement Ratio and Air Entrainment on the Electric Resistivity of Ionically Conductive Mortar

et al. 2019

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“…In fact the increase in permeability and porosity of material is currently accepted as providing a reliable indication of its degradation (at least on a qualitative level), whether it be of mechanical or physico-chemical origins resulting from the cement matrix being attacked by aggressive products [1,2]. Experiments have been conducted over a twenty year period [3] and have shown a consistent increase in permeability and in porosity indicative of the material degradation. Since the early 1930's the rate of water flow through concrete has been of particular interest to civil engineers in dam seepage and water retaining structures problems [4,5] ; however, the interest has shifted in the 1960's when permeability and adsorption were implemented as non-destructive indicators of the quality of concrete [6,7].…”

Section: Introductionmentioning

confidence: 96%

An experimental study of the mechanical behaviour of a mortar and of its permeability under deviatoric loading

Meziani

Skoczylas

1999

Mat. Struct.

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This study, which presents the results of numerous tests on the sensitivity of mortar permeability under conventional triaxial loading, represents tests carried out over more than a year at various confining pressures under monotonic loading or with loading-unloading cycles. Permeability is measured on a sample, dried prior to the test, by injecting argon -a neutral gas. A description of the experimental method based on applying a permanent flow is given as well as the technique of test study used. In this work, we chose to measure permeability under loading at different levels ofdeviatoric stress and strain since this corresponds more closely to the real conditions under which the works are used. Preliminary tests showed that the permeability under load was susceptible to early appearance of microcracks and began to increase noticeably towards 75/80% of the stress peak. Further tests were then carried out with loading-unloading cycles for stress levels beyond the stress peak. The authors have shown that permeability increases very rapidly, starting from this peak. This is irreversible as the measurements taken after unloading the sample prove. The different tests also prove that the damage level is insufficient to allow for a description of variation in permeability, as it clearly depends on the degree to which the microcracks have opened. Such a claim is supported by results where this variation is presented in relation to lateral strain. R I~S U M I 5

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“…The permeability was measured for all cement samples after curing for 24 h at 292 F and 3000 psi on cylindrical samples with a diameter of 3.81 cm and a length of 1.52 cm following the procedures explained by Sanjuán and Muñoz-Martialay 55 through the use of the Hagen–Poiseuille law, which is commonly used for estimating the porous media permeability using a compressible fluid (mostly a gas) injected under steady-state and laminar flow conditions. 56 Nitrogen gas was used for permeability measurement; it was injected through the cement cylindrical samples at 1200 psi while applying a backpressure of 500 psi.…”

Section: Materials and Methodologymentioning

confidence: 99%

Improving Saudi Class G Oil-Well Cement Properties Using the Tire Waste Material

et al. 2020

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After oil and gas well drilling, they should be cased and cemented to ensure the stability of the wellbore and to isolate the trouble zones. To achieve these jobs, several additives are incorporated into the cement slurry to improve the cement matrix durability, especially at temperatures above 230 F. The tire waste material is an industrial waste that comes from automobile tires. The purpose of this work is to investigate the prospect of utilizing tire waste in oil-well cement under high-temperature and high-pressure conditions of 292 F and 3000 psi. Three cement samples with different concentrations of the tire waste material were prepared. The effects of tire waste on the cement rheological properties, elastic and failure parameters, and permeability were examined. The results showed that adding 0.3% by weight of cement (BWOC) of the tire waste material considerably improved the cement to the cement slurry and cement matrix properties, and it decreased the cement plastic viscosity by 53.1% and increased its yield point by 142.4% compared to the base cement. The cement samples with 0.3% BWOC of tire waste have Young’s modulus which is 10.8% less than that of the base cement and Poisson’s ratio of 14.3% greater than that of the base cement. By incorporating 0.3% of the tire waste, both compressive and tensile strengths of the cement increased by 48.3 and 11.7%, respectively, compared with those of the base cement. The cement permeability was decreased by 66.0% after adding 0.3% of the tire waste. Besides the improvement in the properties of cement, the use of the tire waste material has other economical and environmental advantages because these are very cheap materials dominant in our life.

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Influence of the age on air permeability of concrete

Cited by 28 publications

References 6 publications

The Influence of Water/Cement Ratio and Air Entrainment on the Electric Resistivity of Ionically Conductive Mortar

The Influence of Water/Cement Ratio and Air Entrainment on the Electric Resistivity of Ionically Conductive Mortar

An experimental study of the mechanical behaviour of a mortar and of its permeability under deviatoric loading

Improving Saudi Class G Oil-Well Cement Properties Using the Tire Waste Material

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