Internal sulfate attack on concrete caused by gypsum-bearing aggregates

Zhishui Xing; Min Deng; Aiguo Wang; Kaiwei Liu

doi:10.3969/j.issn.1007-9629.2014.01.006

Internal sulfate attack on concrete caused by gypsum-bearing aggregates

Zhishui Xing, Min Deng, Aiguo Wang, Kaiwei Liu

College of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

Some concrete samples taken from Shiziya tunnel in Hubei province were analyzed by XRD, SEM/EDS, BSEM/EDS, optical microscope and micro-hardness device. It is shown that deterioration of concrete in the form of cracking, and decrease of cohesion and strength are caused by the internal sulfate attack caused by gypsum-bearing dolomite coarse aggregates. Ettringite and thaumasite are formed in the interface transition zone between gypsum in the coarse aggregate and mortars. Therefore, the structures of the interface transition zone and the matrix are loose and porous, the micro-hardness is reduced.

Original language	English
Pages (from-to)	30-34+41
Journal	Jianzhu Cailiao Xuebao/Journal of Building Materials
Volume	17
Issue number	1
DOIs	https://doi.org/10.3969/j.issn.1007-9629.2014.01.006
State	Published - 2014

Keywords

Aggregate
Concrete
Ettringite
Gypsum
Sulfate attack
Thaumasite

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10.3969/j.issn.1007-9629.2014.01.006

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title = "Internal sulfate attack on concrete caused by gypsum-bearing aggregates",

abstract = "Some concrete samples taken from Shiziya tunnel in Hubei province were analyzed by XRD, SEM/EDS, BSEM/EDS, optical microscope and micro-hardness device. It is shown that deterioration of concrete in the form of cracking, and decrease of cohesion and strength are caused by the internal sulfate attack caused by gypsum-bearing dolomite coarse aggregates. Ettringite and thaumasite are formed in the interface transition zone between gypsum in the coarse aggregate and mortars. Therefore, the structures of the interface transition zone and the matrix are loose and porous, the micro-hardness is reduced.",

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author = "Zhishui Xing and Min Deng and Aiguo Wang and Kaiwei Liu",

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TY - JOUR

T1 - Internal sulfate attack on concrete caused by gypsum-bearing aggregates

AU - Xing, Zhishui

AU - Deng, Min

AU - Wang, Aiguo

AU - Liu, Kaiwei

PY - 2014

Y1 - 2014

N2 - Some concrete samples taken from Shiziya tunnel in Hubei province were analyzed by XRD, SEM/EDS, BSEM/EDS, optical microscope and micro-hardness device. It is shown that deterioration of concrete in the form of cracking, and decrease of cohesion and strength are caused by the internal sulfate attack caused by gypsum-bearing dolomite coarse aggregates. Ettringite and thaumasite are formed in the interface transition zone between gypsum in the coarse aggregate and mortars. Therefore, the structures of the interface transition zone and the matrix are loose and porous, the micro-hardness is reduced.

AB - Some concrete samples taken from Shiziya tunnel in Hubei province were analyzed by XRD, SEM/EDS, BSEM/EDS, optical microscope and micro-hardness device. It is shown that deterioration of concrete in the form of cracking, and decrease of cohesion and strength are caused by the internal sulfate attack caused by gypsum-bearing dolomite coarse aggregates. Ettringite and thaumasite are formed in the interface transition zone between gypsum in the coarse aggregate and mortars. Therefore, the structures of the interface transition zone and the matrix are loose and porous, the micro-hardness is reduced.

KW - Aggregate

KW - Concrete

KW - Ettringite

KW - Gypsum

KW - Sulfate attack

KW - Thaumasite

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DO - 10.3969/j.issn.1007-9629.2014.01.006

M3 - 文章

AN - SCOPUS:84897149033

SN - 1007-9629

VL - 17

SP - 30-34+41

JO - Jianzhu Cailiao Xuebao/Journal of Building Materials

JF - Jianzhu Cailiao Xuebao/Journal of Building Materials

IS - 1

ER -

Internal sulfate attack on concrete caused by gypsum-bearing aggregates

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