Concrete and Welding Inspection and Testing Procedures

Concrete and Welding Inspection and Testing

Concrete Testing

Slump Test

The slump test assesses fresh concrete consistency and indirectly verifies the correct water amount. Wet concrete is placed in a cone-shaped mold and allowed to slump after the cone is removed. The vertical distance between the mold top and the slumped mixture top indicates workability.

The slump is acceptable if within the specified tolerance. If unacceptable, another test is performed immediately. If the second test also fails, the concrete is rejected.

Welding Inspection

Visual Inspection and Slag Removal

Visual inspection checks for defects like cracking, slag inclusions, porosity, and undercut. For simple welds, inspection at the start and periodically during the process may suffice.

Slag removal is typically done with manual tools (e.g., chipping hammer, wire brush) or power tools (e.g., angle grinder).

Test Results and Project Impact

A failed slump test leads to concrete rejection, causing project delays and increased costs. Slag removal is necessary as slag doesn't contribute to strength. Visual inspection ensures quality and usability, potentially increasing material costs for repairs or replacements.

Material Sampling and Laboratory Testing

Samples must represent the total quantity. The chain of custody must be maintained, documenting:

• Who took the sample and any witnesses
• What sample(s) were taken (amount/volume)
• When the sample was taken (date and time)
• Where the sample was taken (location, environment, weather)
• Why the lab testing is being conducted
• How the sample was collected

Example of Correct Material Handling: Plasterboard

Plasterboard should be delivered just before installation to minimize damage. Store it flat, dry, and off the ground on strong bearers (max. 600mm centers). Ensure adequate ventilation.