Concrete specifications for new jerssy barrier

Here are some common concrete specifications for a New Jersey-style barrier:

General Requirements

• The barrier shall be constructed of concrete with a minimum compressive strength of 4,000 psi (pounds per square inch) at 28 days.
• The concrete shall be mixed and placed in accordance with the American Concrete Institute (ACI) 318-14, Building Code Requirements for Structural Concrete.
• The barrier shall be designed and constructed to withstand the following loads:
  • Dead load: the weight of the concrete and any permanent attachments.
  • Live load: the weight of vehicles, snow, and other temporary loads.
  • Wind load: the force exerted by wind on the barrier.
  • Seismic load: the force exerted by earthquakes on the barrier.

Concrete Mix Design

• The concrete mix design shall be as follows:
  • Cement: Type I or Type II, 600-700 pounds per cubic yard.
  • Aggregates: 1/2-inch to 3/4-inch crushed stone or gravel, 1,200-1,400 pounds per cubic yard.
  • Sand: 300-400 pounds per cubic yard.
  • Water: 150-200 gallons per cubic yard.
  • Air entrainment: 5-7% by volume.
  • Retarding admixture: 1-2% by weight of cement.

Barrier Design

• The barrier shall be designed as a reinforced concrete wall with a minimum thickness of 12 inches.
• The wall shall be constructed with a minimum of 2 inches of concrete cover over the reinforcement.
• The reinforcement shall consist of a minimum of 1/2-inch diameter rebar, spaced at 12 inches on center.
• The top of the barrier shall be designed to resist a minimum of 1,500 pounds per linear foot of wind load.
• The barrier shall be designed to resist a minimum of 1,000 pounds per square foot of seismic load.

Construction Requirements

• The concrete shall be placed in layers not exceeding 12 inches in depth.
• Each layer shall be finished with a trowel or screed board to achieve a smooth, even surface.
• The concrete shall be cured with a minimum of 3 days of wet curing, followed by 7 days of dry curing.
• The barrier shall be constructed in accordance with the New Jersey Department of Transportation (NJDOT) Standard Specifications for Road and Bridge Construction.

Testing and Inspection

• The concrete shall be tested for compressive strength at 7 and 28 days.
• The barrier shall be inspected at regular intervals during construction to ensure compliance with the specifications.
• The NJDOT shall conduct a final inspection and testing of the barrier before it is accepted for use.

Special Requirements

• The barrier shall be designed and constructed to resist the impact of vehicles traveling at a minimum speed of 65 miles per hour.
• The barrier shall be designed and constructed to resist the effects of salt and de-icing chemicals.
• The barrier shall be designed and constructed to resist the effects of freeze-thaw cycles.

Please note that these specifications are general guidelines and may need to be modified to suit specific project requirements. It is recommended that you consult with a structural engineer or a concrete expert to ensure that your barrier design meets the necessary specifications and regulations.