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Review of Maryland SHA Specification for Portland Cement Concrete Permeable Pavement System

Review of Maryland SHA Specification for Portland Cement Concrete Permeable Pavement System. Maintenance. Freeze Thaw Durability. Abrasion Resistance. Strength. The American Concrete Institute Committee Report ACI 522R-Pervious Concrete, Chapter 7.2.2 states:

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Review of Maryland SHA Specification for Portland Cement Concrete Permeable Pavement System

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  1. Review of MarylandSHA SpecificationforPortland Cement ConcretePermeable PavementSystem

  2. Maintenance

  3. Freeze Thaw Durability

  4. Abrasion Resistance

  5. Strength The American Concrete Institute Committee Report ACI 522R-Pervious Concrete, Chapter 7.2.2 states: “Guidance for structural design of conventional concrete pavements is provided in ACI 330R for parking lots and in ACI 325.12R for streets and roads. These documents cover many different aspects of paving design. The structural design recommendations in these documents, however, are not necessarily applicable for use with pervious pavement. As there are no standardized test methods for strength of pervious concrete, design and specification by strength should be avoided”.

  6. Table 902A

  7. ACI 522R-10 RReport on Pervious Concrete

  8. Table 902A

  9. Testing Fresh DensityASTM C1688 Density and Void Content of Freshly Mixed Pervious Concrete • 0.25 ft3 measure (standard air pot) • Standard Proctor Hammer

  10. Example Portland cement…….……...600 pcy Coarse aggregate*…..…...2,670 pcy (ssd) Water………………… …..180 pcy Total Weight…………......3,450 pcy *b/b 0 = 1.00 Dry rodded unit weight = 98 pcf Design plastic unit weight = 3,450/27 = 128 pcf Acceptance 128 +/- 5 pcf Design air-free unit weight = 163 pcf Calculated void content = (163-127)/163 = 22% > 15%

  11. Fill in two equal layers 1st lift – 20 drops

  12. 2nd lift – 10 dropsRefill / 10 more drops

  13. Density = 31.95 lb / 0.25 ft3 = 128 lb/ft3

  14. Permeable Pavement System

  15. Materials

  16. Excavation

  17. The System

  18. Stone Base

  19. The Pervious Concrete

  20. Monitoring Equipment

  21. Contractor Qualifications

  22. Test Panels

  23. Thickness, Density, Infiltration

  24. ASTM C1701 Infiltration Rate as a Function of ASTM C1688 Void Content Kevern, J.T, Montgomery J

  25. Plus or minus 5

  26. ASTM C 1701 Infiltration400 per hour

  27. Measuring In Place Infiltration • ASTM C1701 • Infiltration Rate of In Place Pervious Concrete

  28. Test Equipment Infiltration Ring – 12 +/- ½ in. Scale Container – 5 gallons Stop watch Plumbers Putty Water

  29. Test Location • 3 test for up to 25,000 sft • Additional test for each 10,000 sft • Minimum 3 ft between test location • No standing water • Do not test within 25 hours of rain

  30. Questions / Comments Thank you!

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