COMBINED DETERIORATION PROBLEMS IN A COASTAL BRIDGE IN NSW, AUSTRALIA

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SHAYAN A.; MORRIS H.

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Journal Paper

Paper Information

Journal: ASIAN JOURNAL OF CIVIL ENGINEERING (BUILDING AND HOUSING) Year:2005 | Volume:6 | Issue:6 Page(s): 477-493

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Information Journal Paper

Title

COMBINED DETERIORATION PROBLEMS IN A COASTAL BRIDGE IN NSW, AUSTRALIA

Author(s)

SHAYAN A. | MORRIS H. | Issue Writer Certificate

Keywords

AAR

CORROSION

DEF

CONCRETE DURABILITY

THERMAL EXPANSION

Abstract

Deep Creek Bridge was built in 1981 and is in the coastal area of the Northern NSW and subject to tidal salt water. The bridge has shown signs of premature deterioration, less than 20 years after construction, in the form of vertical cracking in the pier columns. Based on visual observations, it was suspected that alkali-aggregate reaction (AAR) and CORROSION of reinforcement could be the two major probable causes of the cracking. Eight concrete cores were examined from the cracked pier columns of the bridge, and AAR has been confirmed in the concrete, caused by reactive quartz gravel of a gneissic origin. AAR is considered to be the major cause of the observed cracking, and reduction in the strength properties of the concrete. The large in-situ cast pier columns (950 mm diameter) may have been subjected to temperature rises to or beyond 80 °C, as a result of cement hydration, causing delayed ettringite formation. However, this would probably have had a minor contribution to the observed cracking. Temperature-induced cracking did not appear to have played a significant role in the cracking. Chloride-induced CORROSION has also been identified, and may have been exacerbated by the AAR microcracking. The pier columns may require cathodic protection (CP) to arrest the progress of steel CORROSION and damage to the structure. The adverse interaction of CP currents and AAR would need careful assessment as part of the rehabilitation of the structure, for which jacketing of columns with reinforced concrete is being considered.

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APA: Copy

SHAYAN, A., & MORRIS, H.. (2005). COMBINED DETERIORATION PROBLEMS IN A COASTAL BRIDGE IN NSW, AUSTRALIA. ASIAN JOURNAL OF CIVIL ENGINEERING (BUILDING AND HOUSING), 6(6), 477-493. SID. https://sid.ir/paper/298594/en

Vancouver: Copy

SHAYAN A., MORRIS H.. COMBINED DETERIORATION PROBLEMS IN A COASTAL BRIDGE IN NSW, AUSTRALIA. ASIAN JOURNAL OF CIVIL ENGINEERING (BUILDING AND HOUSING)[Internet]. 2005;6(6):477-493. Available from: https://sid.ir/paper/298594/en

IEEE: Copy

A. SHAYAN, and H. MORRIS, “COMBINED DETERIORATION PROBLEMS IN A COASTAL BRIDGE IN NSW, AUSTRALIA,” ASIAN JOURNAL OF CIVIL ENGINEERING (BUILDING AND HOUSING), vol. 6, no. 6, pp. 477–493, 2005, [Online]. Available: https://sid.ir/paper/298594/en

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