Armed with this new information, John's company was able to reject the subpar aggregates and switch to a new supplier. The quality of their concrete improved dramatically, and they were able to avoid costly repairs down the line.

It was a sunny day in late summer when John, a materials engineer at a construction company, received a call from his boss. "John, we have a problem," his boss said. "One of our suppliers has been providing us with subpar concrete aggregates, and we need to figure out what's going on."

Armed with this knowledge, John and his team retested the aggregates using the procedures outlined in ASTM D7012-14. They carefully prepared the rock core specimens, ensuring that they were properly trimmed and polished. They then subjected the specimens to varying states of stress and temperature, measuring the compressive strength and elastic properties.

The results were striking. The compressive strength of the aggregates was significantly lower than what the supplier had claimed. In fact, the results showed that the aggregates were not suitable for use in concrete.

The company's quality control team had been conducting tests on the aggregates, but they weren't sure if they were doing it right. That's when they remembered that ASTM International, a globally recognized leader in the development and delivery of voluntary consensus standards, had published a standard for determining the compressive strength of rock.

The standard, ASTM D7012-14, "Standard Test Methods for Compressive Strength and Elastic Properties of Intact Rock Core Specimens under Varying States of Stress and Temperatures," provided a detailed methodology for testing the compressive strength of rock.

John decided to download the PDF of ASTM D7012-14 and study it carefully. He realized that the standard specified the equipment, test procedures, and calculations required to determine the compressive strength of rock.

John knew that the company had been using these aggregates for a while, but recently, they had started to notice some inconsistencies in the quality of their concrete. The compressive strength was lower than expected, and there were visible signs of deterioration.