When you look at a concrete test report is your eye drawn immediately to the bottom line--cylinder strength? If so, you may miss valuable information.

REPORTS REFLECT QUALITY OF TESTING

If a report doesn't contain the required information, strength test results may be of little value. For instance, failure to include the results of slump, air, and temperature tests may show that the person making the cylinders wasn't properly equipped or trained. The reported information and the way it's reported also help you evaluate the concrete and the quality of sampling and testing.

MEASURING TEST VARIABILITY

Two cylinders taken from the same sample of concrete should have about the same 28-day strength. Testing control isn't good if the difference between strengths of cylinders from the same batch is consistently high. This indicates problems in control of the way cylinders are made, handled, or tested.