Permeability of Concrete Subjected to Cyclic Loading

Tawfiq, Kamal; Armaghani, Jamshid; Vysyaraju, Janaki Ramprasad

doi:10.3141/1532-08

Cited by 4 publications

(5 citation statements)

References 8 publications

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“…Improved testing methods and new standards are currently available for in-situ and laboratory assessments of gas and water permeability of concrete and porous media [8][9][10][11][12]. From an experimental perspective, the degradation in concrete or rock modulus and the corresponding change in permeability, due to static and cyclic mechanical loading, has been demonstrated and documented in the literature [13][14][15][16]. Results from these different studies show that, under static loading, the permeability of concrete changes only slightly during the initial loading stages.…”

Section: Introductionmentioning

confidence: 99%

“…However, most of the previously mentioned studies relate to permeability measurements carried out on unloaded materials. The experimental techniques described in these articles, except for [15,16], consist of loading a large sample, then cut it into a smaller one in order to measure its permeability. This does not allow the crack opening effect upon permeability to be evaluated.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…In addition, normal strength concrete showed highest permeability while mortar had the lowest water permeability. The relationship between damage and the air permeability of concrete was also studied using concrete beam under flexural cyclic loading [Tawfiq et al, 1996]. Findings indicated that air permeability of concrete increased with the increase of loading levels as well as the number of cycles.…”

Section: Effects Of Cracking On Transport Properties Of Concretementioning

confidence: 99%

Interaction Between Micro-Cracking, Cracking, and Reduced Durability of Concrete: Developing Methods for Quantifying the Influence of Cumulative Damage in Life-Cycle Modeling

Yang¹,

Weiss²,

Olek³

2004

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Prepared in cooperation with the Indiana Department of Transportation and Federal Highway Administration. Abstract .It is becoming increasingly popular to utilize numerical simulation models to predict the long-term performance of concrete pavements and structures. The majority of these models have been developed using laboratory test data that considers concrete in an uncracked state. While uncracked concrete exists as the best case scenario, frequent cracking occurs in real structures that could have a profound impact on life cycle performance. Cracks from several sources may accumulate and interact thereby accelerating the deterioration of concrete. For example, the distributed cracking caused by freeze/thaw damage can substantially increases the rate of water absorption and reduces the load carrying capacity of concrete. To accurately simulate the performance of actual concrete facilities, the role of cracking and its cumulative effect on the changes of material properties should be accounted for in these models. The main goal of this investigation was to assess the influence of cumulative damage in concrete and to quantify its influence for use in life-cycle performance modeling. Samples were taken from five concrete pavement sections based on age, traffic, and overall performance to assess existing damage and to identify possible sources responsible for inducing the damage. These results were used as a baseline to assess the types of damage that merited laboratory investigation. After the field assessment, laboratory investigations were conducted to simulate the damage that may be expected in the field. After various levels of damage were introduced in laboratory specimens, durability tests (freezing and thawing and water absorption) and direct tensile test were performed to develop an understanding of how the pre-existing damage accelerated the deterioration process. Specifically, it was determined that cracks caused by freezing and thawing dramatically increase the rate and amount of water absorption while cracks caused by mechanical loading only increased the absorption in a local region. Further, freeze-thaw damage dramatically reduces the direct tensile strength and modulus of elasticity of concrete until the aggregates begin to pull out of the matrix. This results in a larger fracture process zone in the damaged concrete than in the undamaged concrete.17.

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“…Formation of cracks is a widespread phenomenon in both asphalt concrete and PCC pavements. In PCC, before application of an external load, bond cracks may occur in concrete at the mortar-aggregate interface, with negligible cracking in either the mortar or aggregate phases [85]. Cyclic loading propagates cracking, and with extension and widening of microcracks, a network of cracks may form.…”

Section: Infiltration Through Cracksmentioning

confidence: 99%

“…In asphalt concrete, mineral fillers such as rock, dust, slag dust, hydrated lime, hydraulic cement, fly ash and loess may be used to increase density and strength of asphalt concrete mixture. A laboratory study by Tawfiq et al [85] suggests that addition of mineral filler such as silica fume and fly ash reduces the extent of crack formation, and thus the hydraulic conductivity of concrete. Yet, more of the studies focus on sealing of cracks rather than preventing them.…”

Section: Infiltration Through Cracksmentioning

confidence: 99%

A Review of Roadway Water Movement for Beneficial Use of Recycled Materials

Apul¹,

Gardner²,

Eighmy³

The Handbook of Environmental Chemistry

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The purpose of this chapter is to provide a comprehensive review of water movement in roadways so that this knowledge may be used in environmental impact studies of traditional and recycled pavement materials. Long term leaching of contaminants is dictated in part by the hydrology of the roadway environment. To determine the hydraulic regimes in the field, ingress and egress routes and the hydraulic conductivity of the materials need to be known. This paper demonstrates that the major water ingress routes are along cracks, joints, and shoulders. It is shown that both saturated and unsaturated conditions in the field occur, suggesting that the contaminant leaching studies that consider saturated conditions

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Permeability of Concrete Subjected to Cyclic Loading

Cited by 4 publications

References 8 publications

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

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

Interaction Between Micro-Cracking, Cracking, and Reduced Durability of Concrete: Developing Methods for Quantifying the Influence of Cumulative Damage in Life-Cycle Modeling

A Review of Roadway Water Movement for Beneficial Use of Recycled Materials

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