Case Study of Remaining Service Life Assessment of a Cooling Water Intake Concrete Structure in Indonesia

M Sigit Darmawan,N A Husin,Ridho Bayuaji,R B Anugraha

doi:10.1155/2014/970393

M Sigit Darmawan, N A Husin + Show 2 more

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https://doi.org/10.1155/2014/970393

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Abstract

This paper deals with the assessment of remaining service life of a cooling water intake concrete structure (CWICS) subjected to corrosion due to chloride attacks. Field and laboratory tests were performed to determine the current existing condition of the structure. Both destructive and nondestructive tests were employed to obtain the parameter needed for the assessment. Based on the current condition and test results, structural analysis was carried out and the remaining safety factor of CWICS was determined. From the analysis, it was found that most concrete elements of CWICS had safety factor greater than unity and might fulfil its intended service life up to the year 2033. However, fewer elements require immediate strengthening to extend their service life.

Highlights

Corrosion of reinforcing steel due to chloride attack is considered to be the primary cause of concrete deterioration of reinforced concrete structure [1]
This paper presents a study of remaining life assessment [4] of cooling water intake concrete structure (CWICS) at Indonesia
(i) From field and laboratory tests, no significant corrosion activity has been found at CWICS

Summary

Introduction

Corrosion of reinforcing steel due to chloride attack is considered to be the primary cause of concrete deterioration of reinforced concrete structure [1]. This factor combined with poor practice in detail design, bad supervision, and bad construction execution lead to early deterioration of concrete structures. Theoretical foundation of chloride penetration in concrete structure was not yet fully developed and well understood at that time. This lack of knowledge and understanding on concrete deterioration mechanism lead to nonintended faulty concrete practices. It is not surprising that older concrete structures often has durability problem before their design life has expired

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