ON ATTACK PRODUCT AND CORROSION MECHANISM OF HYDRAULIC CONCRETE AFTER LONG-TERM EXPOSURE  TO NATURAL ENVIRONMENT IN WESTERN CHINA

J Chin Soc Corr Pro

2005, Vol. 25

Issue (5): 299-302 DOI:

Research Report

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ON ATTACK PRODUCT AND CORROSION MECHANISM OF HYDRAULIC CONCRETE AFTER LONG-TERM EXPOSURE TO NATURAL ENVIRONMENT IN WESTERN CHINA

Xiaojian Gao;Baoguo Ma;

武汉理工大学硅酸盐材料工程教育部重点实验室

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Abstract A site investigation was made on one deteriorated concrete with 6 year s age,and this concrete component was located in one tunnel of one concrete dam in Western China.Some samples were taken from the attacked concrete and were a nalyzed with XRD,SEM-EDAX and Laser Raman Spectroscopy methods.As a result,it is shown that a mushy mixture consisting of thaumasite,ettringite,gypsum and calcite occurs in the residual concrete exposed to low temperature,high humidit y,sulfate and carbonate for a long time.It is validated that the thaumasite fo rm of sulfate attack may occur in hydraulic concrete structures in Western China .In addition,the corrosion mechanism is also discussed.

Key words: concrete dam sulfate carbonate thaumasite form of sulfate attack Western China

Received: 26 March 2004

ZTFLH:

TU528

Corresponding Authors: Xiaojian Gao E-mail: xjgao2002@yahoo.com.cn

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Xiaojian Gao; Baoguo Ma. ON ATTACK PRODUCT AND CORROSION MECHANISM OF HYDRAULIC CONCRETE AFTER LONG-TERM EXPOSURE TO NATURAL ENVIRONMENT IN WESTERN CHINA. J Chin Soc Corr Pro, 2005, 25(5): 299-302 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2005/V25/I5/299

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