Condition Assessment of the Deteriorated Reinforced Concrete Bridge

Gunawan Budi Wijaya, Narciso Pacuribot




Abstract


A comprehensive assessment was conducted to an old reinforced concrete bridge in Brunei Darussalam. This bridge is about 30-40 years old, and has already shown signs of concrete distresses. The main concern was the integrity of the columns, beams and deck, as signs of concrete deteriorations were readily noticeable, e.g. cracks, delaminations, exposed rebar, and concrete spalling. Both visual inspection and non-destructive tests were performed on site. For more detail evaluation, concrete core samples were extracted and sent for testing. Based on information gathered during the investigation and the results of laboratory testing, the reviewed concrete columns were found in bad condition and required immediate repair. The main cause of this concrete distress was the reinforcement corrosion. The vertical column reinforcements were badly corroded and could not function as designed. Without initiating a repair program, it should be prepared for progressive deteriorating conditions, eventually leading to a structural at-risk scenario.


Keywords


Condition assessment; concrete deteriorations; nondestructive test; laboratory testing.

References


1. ACI 364.1R-07, Guide for Evaluation of Concrete Structures before Rehabilitation, ACI Committee 364, Farmington Hills, MI., USA, 2007. [CrossRef]

ACI 228.2R-13, Report on Nondestructive Test Methods for Evaluation of Concrete in Structures, ACI Committee 228, Farmington Hills, MI, 2013. [CrossRef]

ACI 201.1R-08, Guide for Conducting a Visual Inspection of Concrete in Service, ACI Committee 201, Farmington Hills, MI., USA, 2008. [CrossRef]

ASTM D-4580, Practice for Measuring Delaminations in Concrete Bridge Decks by Sounding, ASTM International, West Conshohocken, PA., USA, 2002. [CrossRef]

ASTM C-805, Standard Test Method for Rebound Number of Hardened Concrete, ASTM International, West Conshohocken, PA., USA, 2002. [CrossRef]

ASTM C-597, Standard Test Method for Pulse Velocity through Concrete, ASTM International, West Conshohocken, PA., USA, 2002. [CrossRef]

ACI 214.4R-10, Guide of Obtaining Cores and Interpreting Compressive Strength Results, ACI Committee 214, Farmington Hills, MI., 2010. [CrossRef]

ASTM C-42, Standard Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete, ASTM International, West Conshohocken, PA., USA, 2016. [CrossRef]

ASTM C-1218M, Test Method for Water Soluble Chloride in Mortar and Concrete, ASTM International, West Conshohocken, PA., USA, 2002. [CrossRef]

ACI 222R-01, Protection of Metals in Concrete Against Corrosion, ACI Committee 222, Farmington Hills, MI., USA, 2001. [CrossRef]

ACI 224.1R-07, Causes, Evaluation, and Repair of Cracks in Concrete Structures, ACI Committee 224, Farmington Hills, MI., USA, 2007. [CrossRef]

ACI 318R-05, Building Code Requirements for Reinforced Concrete, ACI Committee 318, Farmington Hills, MI., USA, 2005. [CrossRef]


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