Construction of Pervious Concrete Pavements Construction of Pervious Concrete Pavements From the Pervious

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  • Construction of Pervious Concrete Pavements

    From the Pervious Concrete Certification Program

  • SITE PREPARATION

    Duraport Parking Lot, Bayonne, NJ Placed October 2007

  • Site Preparation – Cut and Fill

    Site can be graded flat to maximize storage of stormwater

  • Recharge Bed Preparation

    Place and compact stone to desired depth

    Keep stone clean Remove all dirt and debris that may clog recharge bed

  • Site Preparation - Compaction

    Compact subgrade to 92% of modified proctor Compact aggregate base to 95% of modified proctor

    Don’t over compact, subgrade must remain permeable

  • Filter Fabric

    Non-woven geotextile fabric is specified to prevent migration of fines into recharge bed

  • Setting Forms

    Use string lines to set form elevation

    Wood or steel forms can be used

  • Crew Duties – 8 Man Crew + 1

    1 handles chute & hose

    3 rake and level

    2 strike-off/compact (run screed)

    2 finish (side roller), joint, edge and cure (plastic)

    1 to oversee all

  • Finishing: The Typical Process

    Spreading Strike-off Compacting Jointing/Edging Curing

    1

    2

    3

    4

    5

  • Spreading 1

  • Moistened Base 1

  • Proper Water Content

    When concrete arrives on site, check for quality

    “Squeeze test” grab a handful, squeeze for 5 seconds, release Half of your hand should be coated with paste

    1

  • How Do You Know Its Right? 1

    Look for ‘wet metallic sheen’

  • Recharge Bed Preparation

    Rake out tire tracks

  • Mixer Discharge 1

    Hang no chutes

    Use only one chute section

  • Pervious Concrete Placement 1

  • Edges

    Tamp the edges (approx 3’-6”) for durability

    1

  • Edges

    Place the edges first, then work toward the middle

    1

  • Edges

    Place the edges in lifts, tamp, and continue to top of form

    1

  • Strike-off 2

  • Pervious Concrete Finishing

    Smooth and compact pervious concrete ½” +/- to desired final grade

    Hydraulic roller steel screed recommended – 10 psi down pressure recommended

    2

  • Pervious Concrete Finishing 2

  • Small Jobs - Sidewalks 2

  • Compacting 3

  • Delaying compaction may cause raveling on a pervious concrete pavement Compaction takes place in top ½ inch of surface Compaction sets aggregate and smoothes the surface

    3Compaction

  • Compacting the Edges 3

  • Cross Rolling 3

  • Edges

    Use an edging tool to round-off edges Tamp tool – do not slide tool

    3

  • Surface Texture

    Important to keep the voids open Do NOT use trowels Do NOT seal the surface No roller marks

    3

  • Jointing 4

  • Joints 4

  • Joints

    Cut joints with a special “jointing” tool with a radius machined at the flange

    Joints should be cut at least ¼ the thickness of the slab

    4

  • Jointing Technique 4

  • Curing 5

  • Curing

    • Cure with 6 mil plastic for at least 7 days

    • Cover within 20 minutes

    5

  • Properly Secured Curing 5

    Hold plastic down by nailing to forms or placing wood or rebar over plastic – do not use dirt

  • Thank You