Guidance for Usage of Permeable Pavement at Airports (2017) / Chapter Skim
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Pages 56-68
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From page 56... ...
56 6.1 Introduction Because the design and functionality concepts of permeable pavements are quite different from those of conventional pavements, the construction of these pavements is also quite different. In constructing a pavement that drains internally rather than by diverting the flow of water to a stormwater system, meticulous production and installation of specially designed materials are required.
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From page 57... ...
Construction Considerations 57 Activity/Component Permeable Pavement Type Porous Asphalt Pervious Concrete PICP Plans, specifications, and estimates Experienced contractors and producers Contractor certifications N/A1 Pre-construction meeting Install erosion and sediment controls Test strip construction Optional2 Subgrade preparation Excavation Finishing to design elevations and grades Soil density and infiltration testing Per specs Per specs Per specs Reservoir layer construction Geotextile for soil filtering of excavated sides Geotextile for soil filtering of underlying subgrade Geomembrane for subgrade impermeable barrier Underdrain installation Open-graded base/subbase aggregate placement Reservoir layer density and stiffness testing 3 4 Optional (per plans/specs) Optional (per plans/specs)
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From page 58... ...
58 Guidance for Usage of permeable pavement at airports also be carefully considered in the process since materials and construction quality are major determinants of performance. Material manufacturers must have experience in producing proper mix designs for porous asphalt and pervious concrete and in making materials that comply with national standards (Carlson et al.
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From page 59... ...
Construction Considerations 59 • Pervious concrete. ACI's pervious concrete pavement specification addresses contractor qualifications as follows: "The contractor shall employ no less than one NRMCA-certified pervious concrete craftsman who must be on site, overseeing each placement crew during all concrete placement, or the contractor shall employ no less than three NRMCA-certified Pervious Concrete Installers, who shall be on site working as members of each placement crew during all concrete placement, or the contractor shall employ no less than five NRMCA-certified Pervious Concrete Technicians, who shall be on site working as members of each placement crew during all concrete placement unless otherwise specified" (ACI 2013)
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From page 60... ...
60 Guidance for Usage of permeable pavement at airports pavement layers. Use of heavy equipment and equipment with narrow tires must be avoided to prevent over-compaction and permeability reduction (Caltrans 2014, Hansen 2008)
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From page 61... ...
Construction Considerations 61 6.6 Reservoir Construction The construction of the reservoir layer involves installing any geosynthetic materials and underdrains that are part of the design, placing and compacting the open-graded aggregate subbase layers, and applying a choker/base course as required. Prior to and during the construction process, continuous checks should be made to ensure that the erosion and sediment controls are in place and fully serving their purpose.
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From page 62... ...
62 Guidance for Usage of permeable pavement at airports for a partial-infiltration design, where lower-permeability soils are unable to drain the stormwater fast enough, and a portion of the water must be conveyed to a storm drain system. Underdrains are not typically required for a full-infiltration design involving high-permeability soils but may be used for overflow.
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From page 63... ...
Construction Considerations 63 Stormwater Center 2014)
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From page 64... ...
64 Guidance for Usage of permeable pavement at airports is IPRF's Stabilized and Drainable Base for Rigid Pavement (Hall et al.
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From page 65... ...
Construction Considerations 65 or nuclear density testing. There may be nondestructive testing methods that could be used to verify layer strengths, but these have not been proven.
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From page 66... ...
66 Guidance for Usage of permeable pavement at airports final compaction. Because high-frequency vibrators can seal the surface of the concrete, they should not be used.
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From page 67... ...
Construction Considerations 67 and truck traffic should not be permitted for at least 14 days following construction (ASCE 2015)
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From page 68... ...
68 Guidance for Usage of permeable pavement at airports with the former being most appropriate for small projects and the latter for larger projects due to much higher rates of installation. Pavers should be installed in the patterns and joint widths shown in the construction plans, and straight pattern lines should be maintained at all times (ASCE 2015)
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