Pore Structure and Permeability

Hearn, Nataliya; Hooton, RD; Mills, RH

doi:10.1520/stp36424s

Cited by 29 publications

(11 citation statements)

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“…The compressive strength results suggest that no significant pore refinement occurred after 7 days due to the relatively high W/C ratio. The volume of capillary pores and their connectivity significantly increase for a W/C ratio greater than 0.40 44,45 . It suggests that the pore connectivity was substantially higher at the W/C ratio of 0.60 used in the present study.…”

Section: Permeable Voidsmentioning

confidence: 97%

Properties of high-workability concrete with recycled concrete aggregate

et al. 2011

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This study presents the effects of recycled concrete aggregate (RCA) on the key fresh and hardened properties of concrete. RCA was used to produce high-workability concrete substituting 0-100% natural coarse aggregate (NCA) by weight. The slump and slump flow of fresh concretes were determined to ensure high workability. In addition, the compressive, flexural and splitting tensile strengths, modulus of elasticity, and permeable voids of hardened concretes were determined. The test results revealed that RCA significantly decreased the workability of concrete. RCA also affected the compressive strength, modulus of elasticity, and permeable voids of concrete. At the age of 28 days, the concrete with 100% RCA provided 12.2% lower compressive strength and 17.7% lesser modulus of elasticity than the control concrete. Also, 100% RCA increased the permeable voids of 28-day old concrete by 8.2%. However, no significant negative impact of RCA was observed on the flexural and splitting tensile strengths of concrete.

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Section: Permeable Voidsmentioning

confidence: 97%

Properties of high-workability concrete with recycled concrete aggregate

et al. 2011

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“…Total porosity, size of pores and their distribution, size and form of the biggest pores and the relation between the pores first of all have an effect on compressive strength. Durability depends on freeze-thaw resistance and is controlled by the volume of air entrained in the pores and spaces between the pores [15], [16].…”

Section: Resultsmentioning

confidence: 99%

The Use of Steel Cord Scrap in Concrete

Girskas¹,

Nagrockienė²

2016

Construction Science

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-Materials used for the study: Portland cement CEM I 42.5 R, 4/16 gravel, 0/4 sand. The fine aggregate in four concrete mixtures was substituted with steel cord scrap added at 1.5 %, 3.0 % and 4.5 %. Water absorption and compressive strength was measured in concrete specimens after 7 and 28 days of curing. Total, closed and open porosity was measured in the modified concrete specimens. The tests of predicted freeze-thaw cycles were done. Test results showed that the substitution of fine aggregate with steel cord scrap results in lower water absorption and higher compressive strength in the modified concrete specimens. The porosity parameters have also changed: the closed porosity has increased and consequently the freeze-thaw resistance of modified concrete has improved.

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“…Unfortunately, even at a fixed value of w/c, the measured permeability of various concretes can still vary over orders of magnitude [10]. Therefore, although knowing the w/c of the concrete used in the structure is helpful, predictions based on published data still contain uncertainty that spans orders of magnitude.…”

Section: Permeabilitymentioning

confidence: 99%

“…An approximation for the permeability can be estimated from an analytical relationship [1] that was developed from the review article by Hearn [10]:…”

Section: Permeabilitymentioning

confidence: 99%

Condition assessment of concrete nuclear structures considered for entombment

Snyder¹

2003

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This Report summarizes work to date on a project for the U.S. Nuclear Regulatory Commission to develop guidelines for the chemical and material assessment of an existing structure considered for entombment. In addition, a rational means for performing a probabilistic calculation are addressed. This report is limited to materials issues as they relate to the overall performance of the structure. Structural issues such as the presence of cracks and the location of rebars are discussed only in the context of their effect on transport.The assessment is composed of a preliminary material assessment, followed by a probabilistic calculation of the service life. The material assessment will rely heavily on both the permeability of the intact concrete and the characterization of any existing cracks. The contribution of cracks to transport is considered independently from the intact concrete, and the bulk properties (intact concrete plus cracks) are estimated by combining the two effects using a composite model. Another aspect of the condition assessment of the concrete barrier is the evaluation of nondestructive techniques (NDT) as candidates for characterizing existing cracks, and other transport pathways, in the entombment structure. This aspect will be addressed in a companion report.An important component of the effort to estimate the concrete material properties is the probability density function used to characterize the distribution in their expected values. The "tail" of the distribution has the greatest influence on the overall performance, and, therefore, it should receive attention in the analysis. A number of suitable distributions are considered for their use in characterizing various concrete material properties.iii

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Pore Structure and Permeability

Cited by 29 publications

References 0 publications

Properties of high-workability concrete with recycled concrete aggregate

Properties of high-workability concrete with recycled concrete aggregate

The Use of Steel Cord Scrap in Concrete

Condition assessment of concrete nuclear structures considered for entombment

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