AGGREGATE AND CONCRETE INDUSTRY
Up to the late 1800's the mining of crushed stone was
done by man and mules. Mines employed men to use sledge hammers using
their muscles to work the quarries. Wagons pulled by animals would send
the stone to market. It was a slow and back breaking job. Today modern
machinery with power and capacity can move the largest boulders and rip
into the surface of the Earth with ease.
We usually donít think about roads as a major technological
accomplishment requiring its own industry. Nor do we look at stone or
concrete building as a marvel of human knowledge. But they are!