Ground Penetrating Radar (GPR) to Concrete Column

Cold Joint in a Concrete Column

LDM Scanning was instructed to undertake a Ground Penetrating Radar (GPR) survey of a concrete column.  The purpose of the investigation was to establish any evidence of significant voiding and honeycombing could be detected in the immediate vicinity of a known cold joint in a concrete column.

A GSSI SIR 3000 and 4000 Ground Penetrating Radar systems were used with 2.6GHz, 1.5GHz  and 900MHz antennas.

GPR scans can be conducted using antennas with different central frequencies.  A higher frequency antenna provides better resolution and more detail, however penetration depth is limited.  For this survey two different antennas were used giving a range of penetration depths and resolutions.  the 2.6GHz antenna would typically penetrate to a depth of 300mm in concrete and was considered the most appropriate  for detecting honeycombing, albeit at a relatively shallow depth, while the 1.5GHz antenna would typically penetrate to a depth of 400mm in concrete, thus resolving slightly deeper features.

Voiding and Honeycombing within concrete column

Ground Penetrating Radar (GPR) using GSSI SIR4000 Radar System

GSSI SIR 4000

GSSI SIR 4000 Ground penetrating system

Ground penetrating radar to column

Non intrusive testing to column to determine voiding and honeycombing

Concrete investigation

Cold joint in a concrete column

Ground penetrating radar to column

cold joint in a concrete column

  , ,