Post-Tensioning Special Inspection on 3 Span Bridge

Infrastruct AMS with a well-known civil engineering contractor recently completed a Phase 3 Post-Tensioned Special Inspection (PTSI) on a large three span bridge in the West of Ireland.

Combining the techniques of Ground Penetrating Radar (GPR), Impact Echo and Linear Polarisation Resistance (LPR) we were able to plot the post-tensioning duct profiles in each beam, non-destructively assess if voiding was present in the ducts and measure the rate of corrosion on the embedded reinforcing bars.

Duct and tendon exposures at selected locations confirmed the Impact Echo test results showing fully grouted sections as well as partially or fully voided sections in the ducts.

The pictures below show the marked-up duct profiles on the beams, the Impact Echo testing and a duct and tendon exposure in a fully voided section of post-tensioning duct.

For more information on any of the specialist testing described above or indeed any structural testing and investigations please contact Dr Thomas Callanan in Infrastruct Asset Management Services Limited.


Special Inspection of Reinforced Concrete Tanks

Special Inspection of Reinforced Concrete Tanks
In late 2014, Infrastruct AMS Limited carried out Special Inspections on 3 no. reinforced concrete tanks in a large wastewater treatment facility in Co Dublin. The tanks were out of service for several months and a brief inspection revealed chemical deterioration present on the internal surfaces. Confined spaces trained teams from Infrastruct AMS Limited completed the following works:

1. Hi-pressure water jetting of all structural elements to enable a detailed visual inspection of the internal surfaces;
2. Ground Penetrating Radar (GPR) survey to examine the integrity of the concrete and confirm the location and layout of the embedded reinforcement;
3. Corrosion assessment to confirm corrosion activity and determine the rate of corrosion in the concrete;
4. Crack mapping and measurement, including the depth of cracking on the internal surfaces;
5. Concrete sampling and laboratory testing to determine the properties of the concrete and conclusively establish the source of deterioration in the concrete. All Special Inspection work was under the supervision of our in-house Chartered Engineer.

A detailed technical report was prepared for the Client with recommendations on the most appropriate repair strategy for the three structures.


Concrete Testing on Reinforced Concrete Berthing Structure

Concrete Testing on Reinforced Concrete Structure - Infrastruct
During the spring of 2015, an engineering team from Infrastruct AMS Limited working with a large contracting firm carried out concrete testing and material investigations on a reinforced concrete deepwater structure to determine the following:

1. Location and layout of reinforcement in the structural beams supporting the deck slab;
2. The reinforcement properties to enable a comprehensive structural assessment to be carried out;
3. The condition of the embedded reinforcement to assess the severity of corrosion;
4. Compressive strength of the concrete by removing cores from the structure;
5. Determine the ingress of aggressive chloride ions in the concrete.
6. The results of the testing and investigation works were compiled and a detailed report issued on the findings.