55th Annual Awards 2017
Merit Award—Warehouse Tilt-up
Sponsored by: The New Jersey Chapter of the American Concrete Institute
The New Jersey Concrete and Aggregate Association
“Aurobindo is the future of what our industrial warehouse concrete floor business will look like in the USA. This expanded joint floor is a successful example that it is possible to go beyond conventional joint spacing standards and ACI guidelines that are currently on the books.
The concrete contractor designed his own proprietary expanded joint floor system that performed all the below functions “in house” under one turnkey program for the general contractor and owner. No function or decision was left to outside third parties. All of the variables mentioned delivered a beautifully polished, 50-foot joint spacing (column line to column line) floor, with a 10-year performance warranty that is unheard of in this business, designed and tested for uniformly graded raw materials, flexural strength, and shrinkage beam molds.
The installation utilized 45 pounds of steel fiber per cubic yard, a slip sheet between the subgrade and installed floor, and dowel baskets at all saw joints. This included regular testing of gradations and F.M. of sand and stone to ensure the raw materials being quarried out of the ground and utilized in ready mix concrete production matched what was done in the lab.
The Aurobindo floor makes it look easy to achieve 50-foot, or longer, joint spacing. A “single” course design of steel fibers used at 45 pounds/cubic yard gives the concrete panels enough weight to hold down curling at the joint edges and maximize the loading area of the floor. This lowers the life cycle maintenance costs of the floor and handling equipment riding on it. Steel fibers have a higher modulus of elasticity than concrete and the proactive reinforcement stops micro cracking in its tracks. The total cubic yards of concrete used for this concrete floor was 19,000 yards.”