Traffic bearing structure with permeable pavement
AssigneeVulcan Materials Company
InventorGerald Krzyzak
Life of this patent
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Abstract
A traffic bearing structure with a permeable pavement includes a subgrade, a base positioned on top of the subgrade, and a wear surface positioned on top of the base. The base includes aggregate compacted in a single lift, where the aggregate in the base includes different sized particles mixed together. The wear surface includes a permeable pavement. The particle size distribution of the aggregate in the base is selected to provide adequate stability and permeability for the permeable pavement.
Claims33
A method for installing a traffic bearing structure comprising:
- (a) preparing a subgrade;
- (b) installing a loose aggregate over the subgrade, where 90 to 100% of the aggregate passes through a 25 millimeter screen, 60 to 90% of the aggregate passes through a 12.5 millimeter screen, 30 to 70% of the aggregate passes through a 4.75 millimeter screen, and 7 to 40% of the aggregate passes through a 1.18 millimeter screen;
- (c) compacting the aggregate into a single lift;
- and
- (d) covering the aggregate with a permeable pavement such that the permeable pavement directly contacts the aggregate.
A method for installing a traffic bearing structure comprising:
- (a) preparing a subgrade;
- (b) placing an aggregate over the subgrade;
- (c) compacting the aggregate into a single lift to a California Bearing Ratio (CBR) stability of at least 25 as measured by the ASTM D 1883 (07) test and a permeability of at least 8,500 millimeters per day as measured by the ASTM D 2434 (06) test;
- and
- (d) covering the aggregate with a permeable pavement.
A traffic bearing structure comprising:
- a subgrade;
- a base including a single lift positioned on top of the subgrade, where the lift includes an aggregate, where 90 to 100% of the aggregate passes through a 25 millimeter screen, 60 to 90% of the aggregate passes through a 12.5 millimeter screen, 30 to 70% of the aggregate passes through a 4.75 millimeter screen, and 7 to 40% of the aggregate passes through a 1.18 millimeter screen;
- and
- a wear surface positioned on top of the lift, where the wear surface includes a permeable pavement selected from the group consisting of block pavers, porous asphalt, and porous concrete.
A traffic bearing structure comprising:
- a subgrade;
- a base including a single lift positioned on top of the subgrade, were the lift includes an aggregate compacted to a permeability of at least 8,500 millimeters per day as measured by the ASTM D 2434 (06) test and a California Bearing Ratio (CBR) stability of at least 25 as measured by the ASTM D 1883 (07) test;
- and
- a permeable pavement positioned on top of the lift.
A traffic bearing structure comprising:
- a subgrade;
- a base positioned on top of the subgrade, where the base includes a top lift compacted to between 90 and 95% as measured by the ASTM D 698 (07) test, where the top lift includes aggregate having varying particle sizes such that essentially all the particles will pass through a 37.5 millimeter screen, some of the particles will not pass through a 12 millimeter screen, and some of the particles will pass through a 5 millimeter screen, and where the particle size distribution is selected such that the top lift has a permeability of at least 30,000 millimeters per day as measured by the ASTM D 2434 (06) test and a California Bearing Ratio (CBR) stability of at least 40 as measured by the ASTM D 1883 (07) test;
- and
- a wear surface including a permeable pavement positioned on top of the top lift.
Dependencies are inferred from the claim text.