Crack Width Measurement in Reinforced Concrete Structures

AEIS performs crack width measurements as part of pre-construction surveys, ongoing monitoring, and post-event assessments. Our services include:

• Visual Crack Width Measurement using transparent crack comparator cards.
  
• Microscopic Measurement with calibrated handheld microscopes (resolution up to 0.02 mm)
  
• Tell-Tale Devices for qualitative crack movement detection.
  
• Precision Movement Measurement using Demec gauges or displacement transducers across fixed studs to detect micromovements
  
• Automated Monitoring options using crack width gauges with data loggers for long-term tracking
  

These services are suitable for:

• Existing buildings adjoining construction sites
  
• Bridges, tunnels, retaining walls
  
• Historic and sensitive structures
  
• Infrastructure subject to ground movement or vibration
  

While there is no single prescriptive standard solely for surface crack measurement, the following references apply:

ASTM International

• ASTM C823 – Standard Practice for Examination and Sampling of Hardened Concrete in Constructions
  
• ASTM C876 – Standard Test Method for Corrosion Potentials of Uncoated Reinforcing Steel in Concrete (often used in conjunction with crack assessment)
  
• ASTM E1155 – Standard Test Method for Determining FF Floor Flatness and FL Levelness Numbers (relevant for slab evaluations where cracking is observed)

ACI (American Concrete Institute)

• ACI 224R-01 – Control of Cracking in Concrete Structures
  
• ACI 201.1R – Guide for Conducting a Visual Inspection of Concrete in Service