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Pervious Concrete and Rebar
The document discusses the use of rebar in pervious concrete and its impact on structural integrity. It highlights that while rebar can aid in crack control, it may not be necessary for slabs on grade (SOG) if proper design and techniques are employed. Alternative reinforcement methods, such as macro fibers, may offer better performance without the complications associated with rebar.
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Pervious Concrete and Rebar
- 1. Pervious Concrete andRebar David Liguori Pervious in Paradise 2014 Technical Services Division
- 2. Don’t you Loveit when someone asks…. BAPC Technical Services Division
- 3. • You putrebar in pervious concrete, right? Don’t you Love it when someone asks…. BAPC Technical Services Division
- 4. • You canput rebar in pervious concrete, right? • Don’t All high quality slabs have rebar? Don’t you Love it when someone asks…. BAPC Technical Services Division
- 5. • You canput rebar in pervious concrete, right? • Don’t All high quality slabs have rebar? • What will stop the slab from falling apart without rebar? Don’t you Love it when someone asks…. BAPC Technical Services Division
- 6. • You canput rebar in pervious concrete, right? • Don’t All high quality slabs have rebar? • What will stop the slab from falling apart without rebar? • You need rebar to prevent vertical displacement, don’t you? Don’t you Love it when someone asks…. BAPC Technical Services Division
- 7. Function of rebarin slabs on grade (SOG) • Crack control • Minimize vertical displacement Rebar in SOG is considered secondary reinforcement as it does not increase the compressive or flexural strength of the slab BAPC Technical Services Division
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- 15. STRUCTURAL INTEGRITY OFEPOXY-COATED BARS *Quality and consolidation of the surrounding concrete had an important influence on the corrosion of epoxy- coated bars. More corrosion was observed at surfaces surrounded by less dense, very porous concrete with more and larger voids. *CORROSION PERFORMANCE OF EPOXY-COATED REINFORCEMENT–MACROCELL TESTS CORROSION PERFORMANCE OF EPOXY-COATED REINFORCEMENT–MACROCELL TESTS by Khaled Z. Kahhaleh, Enrique Vaca-Cortés, James O. Jirsa, Harovel G. Wheat, and Ramón L. Carrasquillo Texas Dept of Transportation Nov 1998 BAPC Technical Services Division
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- 18. Will pervious concreteflow around rebar? BAPC Technical Services Division
- 19. • Will perviousconcrete flow around rebar? • No, it must be hand packed BAPC Technical Services Division
- 20. • Will perviousconcrete flow around rebar? • No, it must be hand packed • Is that possible? BAPC Technical Services Division
- 21. • Will perviousconcrete flow around rebar? • No, it must be hand packed • Is that possible? • If so is it practical? BAPC Technical Services Division
- 22. BAPC Technical Services Division 70x70~ 5,000sqft ~ 6,500 lin ft rebar
- 23. • Will perviousconcrete flow around rebar? • No, it must be hand packed • Is that possible? • If so is it practical? • Is it effective? BAPC Technical Services Division
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- 26. Air pockets dueto lack of consolidation around the bars may actually weaken the slab, Exactly the opposite of rebars intended purpose BAPC Technical Services Division
- 27. Successful hand packingaround rebar… • Requires two lifts • Is highly Labor intensive and time consuming • Significantly increases the amount of time the slab is exposed All of which dramatically increase the cost of the installation as well as the risk of failure BAPC Technical Services Division
- 29. Getting the concrete whereyou need it… …how many chutes do you use? BAPC Technical Services Division
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- 32. Is Rebar EvenNecessary in SOG ? • Steel reinforcement actually increases the number of cracks by restraining shrinkage and creating additional stress forces within the slab. • ACI 330R-08 Guide for the Design and Construction of Concrete Parking Lots: “Reinforcing steel is not required or recommended for rigid pavements” • San Francisco prohibits the use of rebar in city sidewalks BAPC Technical Services Division
- 33. For slabs ongrade with a properly prepared subgrade and base, proper control joint design, proper mix design and section thickness, proper placement, finishing, and curing… will do more to achieve good performance from the slab than rebar of any type . Is Rebar Even Necessary in SOG ? BAPC Technical Services Division
- 34. Is Rebar Necessary InPervious Concrete ? • Less water along with aggregate to aggregate contact means less shrinkage, and therefore less shrinkage cracks • Adequate Sub base thickness is critical to performance of any SOG • Pervious concrete typically has a better prepared, thicker sub base section, which results in more structural stability • Aggregate interlock more effective due to course nature of pervious concrete BAPC Technical Services Division
- 35. Alternative Reinforcement Method; MacroFibers BAPC Technical Services Division
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