Approximate migration coefficient of interfacial transition zone and the effect of aggregate content on the migration coefficient of mortar

Yang, Chih-Chyau; Su, J.K

doi:10.1016/s0008-8846(02)00832-3

Cited by 173 publications

(57 citation statements)

References 24 publications

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“…Moreover, adequate strength can be achieved in a short time. EŠects of some in‰uential factors i.e., water content, cement content, curing time, and compaction energy on the engineering characteristics of cement stabilized soils have been extensively researched (Terashi et al, 1979(Terashi et al, , 1980 Many researchers in concrete technology (Owens, 1979;Mitsui, et al, 1994;Ollivier and Massat, 1996;Igarashi, et al, 1996;Yang and Su, 2002;Chindaprasirt et al, 2004; and others) have attempted to use waste pozzolanic materials from industries to reduce the input of cement. Pozzolanic material generally consists of silica, alumina, ferric oxide etc.…”

Section: Introductionmentioning

confidence: 99%

Role of Fly Ash on Strength and Microstructure Development in Blended Cement Stabilized Silty Clay

Horpibulsuk

Rachan

Raksachon

2009

Soils and Foundations

223

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Section: Introductionmentioning

confidence: 99%

Role of Fly Ash on Strength and Microstructure Development in Blended Cement Stabilized Silty Clay

Horpibulsuk

Rachan

Raksachon

2009

Soils and Foundations

223

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“…Considering the aggregate is relatively impermeable and a linear parallel chloride ion flow exists, the migration coefficient of three-phase materials can be expressed as D nssm = D 0 (1-V agg ), where D 0 is the migration coefficient of paste and V agg is aggregate volume fraction (Garboczi and Bentz 1998;Yang and Cho 2005;Yang and Su 2002). The aggregates block the flow paths, reducing the permeable area in a cross-section of specimens.…”

Section: Effect Of Itz On Chloride Migrationmentioning

confidence: 99%

“…Combining the ITZ effect with dilution and tortuosity effects D 0 (1-V agg ) 3/2 , the migration coefficient of mortar was expressed as (Yang and Su, 2002):…”

Section: Chloride Migration Through Itzmentioning

confidence: 99%

Influence of the Interfacial Transition Zone and Interconnection on Chloride Migration of Portland Cement Mortar

Schutter

et al. 2015

ACT

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Available experimental studies on the effect of the interfacial transition zone (ITZ) on transport properties of cement-based composite materials appear to be ambiguous. The main objective of this work was to enhance the understanding of the relationship between ITZ and transport properties of Portland cement-based materials by using both a rapid chloride migration test and theoretical calculations. A densification factor which is related to aggregate volume content was introduced to further determine the transport properties of ITZ. Results indicate that the overall porosity decreased with increasing aggregate volume content due to the dilution effect by impermeable aggregates. The porosity was above the theoretical dilution line obtained from P 0 ×(1-V agg ) for mortars with more than 20% of aggregate, which can be attributed to the presence of high porous ITZ. On the other hand, more porous ITZ was expected to be accompanied by a denser bulk cement matrix, which leaded to a decrease in the porosity of mortar with less than 35% of aggregate. The ITZ effect would dominate the blocking aggregate, densification and tortuosity of bulk paste when aggregate volume content exceeded 0.35. The ratio between the migration coefficient of the ITZ and that of the matrix (D ITZ /D matrix ) increased with aggregate volume content and assumed ITZ thickness. In addition, the influence of ITZ increased with increasing the degree of interconnection slightly until 1.0. Beyond this value, a sudden increase in D ITZ /D matrix ratio was observed indicating the negative percolation effect when the adjacent ITZ start to interconnect.

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“…(12) If Va and N v represent the total volume and total number of aggregate per unit volume concrete, respectively, V′ ITZ can be got by Eq.7, Eq.9 and Eq.11 as follows: (13) Eq.13 can also be approximated as: (14) Based on Eq.3, Eq.10 and Eq.13, the relationship betweenβand Va is shown in Fig.3 for the Fuller gradation. Fig.3(a) and Fig.3(b) represent the aggregate sizes ranging from 0.15 to 5 millimeter and from 0.15 to 20 millimeter, respectively.…”

Section: The Quantitative Characterizationmentioning

confidence: 99%

“…While the ITZ thickness mainly depends on the median size of the cement grains, which is about 10 μm to 30 μm for conventional cements, and not on the aggregate size [11] . The particular microstructure indicates that the ITZ in concrete could have a significant influence, especially, on the transport [12][13][14][15][16][17] and mechanical properties [18,19] of concrete.…”

Section: Introductionmentioning

confidence: 99%

Quantitative analysis and affecting factors of the overlapping degree of interfacial transition zone between neighboring aggregates in concrete

Sun

Zhang

et al. 2011

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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Based on the nearest surface function formula, a quantitative formula to measure the overlapping degree between the interfacial transition zone (ITZ) of neighboring aggregate particles was put forward. The formula was further deduced to quantitatively analyze the influence of the volume fraction of aggregate, ITZ thickness and the maximum aggregate diameter on the overlapping degree between neighboring ITZ. The volume of ITZ was quantitatively calculated in actual concrete by comparing the nearest surface function formula with an approximate method, that is the surface area of the aggregates multiplied by the uniform thickness of the ITZ layers. The results showed that the influencing order of these three factors on the overlapping degree between neighboring ITZ in turn was the interface thickness, aggregate volume fraction and the maximum aggregate diameter; As long as the interface thickness ＜50 μm and the aggregate volume fraction ＜50%, the calculated error between two methods mentioned above is about 10 %.

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Approximate migration coefficient of interfacial transition zone and the effect of aggregate content on the migration coefficient of mortar

Cited by 173 publications

References 24 publications

Role of Fly Ash on Strength and Microstructure Development in Blended Cement Stabilized Silty Clay

Role of Fly Ash on Strength and Microstructure Development in Blended Cement Stabilized Silty Clay

Influence of the Interfacial Transition Zone and Interconnection on Chloride Migration of Portland Cement Mortar

Quantitative analysis and affecting factors of the overlapping degree of interfacial transition zone between neighboring aggregates in concrete

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