Here’s what you’ll learn when you read this story:A newly discovered construction site in Pompeii proves out a theory of why Roman concrete has stood the test of time. The hot-mixing process of concrete creation found in the ancient city was the final evidence needed to fully understand Roman concrete processes. Roman concrete has always been remarkably durable. For decades, researchers credited a special Italian volcanic ash from Naples for the unique mix, since the Romans were the first to introduce ash to concrete. We don’t want to completely copy Roman concrete today.