Shelton New Road Extensive NDT

Project Overview

The structure known as Shelton New Road is a four span simply supported bridge carrying the B5045 dual carriageway over the A500 Trunk Road. The structure is a four span composite steel beam deck consisting of sixteen high yield steel and reinforced concrete top slab. Intermediate supports consist of reinforced concrete leaf piers supported on piled foundations. The two bankseat abutments have a reinforced concrete cross head beam supported on four columns which are founded on strip piled foundations.

The leaf pier investigations consisted of in-situ testing of the concrete (Half Cell Potential, Cover, Cement Content, Chloride Determinations, Carbonation and Resistivity), and a full delamination survey of accessible elevations. Ferroscans were also completed to determine the reinforcement layout and size of reinforcement within the leaf piers.

The deck soffit investigation consisted of in-situ testing of the concrete (Half Cell Potential, Cover, Cement Content, Chloride Determinations, Carbonation and Resistivity), and a delamination survey of the deck slab soffit, at 4 No chosen locations. Ferroscans were also completed to determine the reinforcement layout and size of reinforcement within the slab.

There were a total of 6No trial pits excavated within the deck, 1No in the northern pavement, 4No in the central reservation and 1No in the southern pavement, in order to ascertain the condition of the waterproofing, locate and plot all services and to complete in-situ testing of the deck slab concrete (Half Cell Potential, Cover, Cement Content, Chloride Determinations, Carbonation and Resistivity), and a full delamination survey where accessible.

Ferroscans were completed where access permitted. Pull-off tests were also carried out to the waterproofing to quantify the bonding at the waterproofing / concrete interface. 20No 100mm diameter cores were taken from the carriageway in order to establish the depth and makeup of the surfacing to the deck.