Concrete compliance by strength grade
See whether the concrete of a project complies with its strength grade in GeotechOS Lab, from the 28-day strengths of its samples (AS 1379).
Applies toWindows and macOSWeb browser
Lab judges the concrete of a project against its strength grade, for example N32, from the 28-day compressive strength of each sample (AS 1379).
Open concrete compliance
- Click Reports › Concrete compliance.
- Click the project. The list shows how many concrete samples it has.
Read the assessment
Each strength grade shows its verdict:
- Complies or Does not comply.
- Investigate if requested.
- Not assessed: no 28-day strength yet, until the first 28-day cylinder is broken and approved.
With fewer than three samples, Lab judges each sample against 0.85 f′c and f′c. With three or more, it uses the moving average of three consecutive samples against f′c.
Under the grade, each sample shows its cylinders, for example Cylinder 1 · 7 days · 25.5 MPa (provisional) and Cylinder 2 · 28 days · Due 8 Nov 2026. A strength is provisional until its test is approved.