Seven alumni from the University of Arizona's mining and geological engineering program competed in the alumni division, coming in second place. The competition commemorates the 91 miners who died in the 1972 Sunshine mine disaster and continues to honor all miners who have lost their lives while on the job.
Place concrete at a minimum thickness of 4 inches. Increasing the thickness from 4 inches to 5 inches will add approximately 20% to your concrete cost, but will also boost your driveway's load-carrying capacity nearly 50% , according to the Tennessee Concrete Association.lace concrete at a minimum thickness of 4 inches. Increasing the thickness from 4 inches to 5 inches will add approximately 20% to your concrete cost, but will also boost your driveway's load-carrying capacity nearly 50% , according to the Tennessee Concrete Association.
In order for your concrete driveway to last for years and years, the first steps in preparing the subgrade are critical. Your subgrade should be evenly compacted. A standard driveway is 4â thick of concrete. It should be 4â thick throughout and should not vary 3-4â. 1â deep joint should be created in the concrete in a 4â thick driveway. There is also proper spacing that should be followed for the joint placement. On a 4â thick driveway, joints should be spaced no farther than 8â-12â apart.