Rehabilitation and CFRP strengthening of ASR affected concrete bridge piers

Due to chemical reactions between the alkali hydroxides in the concrete pore solution, Alkali-Silica Reactions (ASR) occur in concrete. These reactions cause internal expansion under certain circumstances. The swelling within the concrete can potentially result in cracking of the concrete impairing its function and shortening its service life. This paper presents the outcomes of engineering inspections, material properties investigation and strengthening design of 56 total piers and abutments of four railway bridges located on the Mildura Line in Victoria. A FE analysis is also completed to investigate the behaviour of CFRP layer in ASR affected piers. The inspection findings are discussed in detail and engineering interpretation is presented including the potential remediation options for the observed defect including steel/concrete jacketing and CFRP wrapping. The cons and pros of these methods are discussed and CFRP wrap is selected as a suitable method.