ABSTRACT
The Porous Concrete Paving Industry................................................................ 418 Advantages and Disadvantages of Porous Concrete .......................................... 421
Cost of Porous Concrete ........................................................................ 421 Hydrology of Porous Concrete .......................................................................... 422
Runoff .................................................................................................... 424 Water Quality.......................................................................................... 425 Surface Clogging and Rehabilitation .................................................... 426
Constituents of Porous Concrete ........................................................................ 426 Aggregate................................................................................................ 427 Portland Cement and Its Supplements .................................................. 428 Reinforcement ........................................................................................ 429 Admixtures ............................................................................................ 429
Construction of Porous Concrete Pavements .................................................... 430 Slab and Subbase.................................................................................... 430 Subgrade Compaction and Its Alternatives ............................................ 431
Joints in Porous Concrete .................................................................................. 432 Control Joints.......................................................................................... 432 Expansion Joints .................................................................................... 434
Care Required in Porous Concrete Installation .................................................. 435 Installer’s Qualifications ........................................................................ 435 Proportioning of Mixture........................................................................ 436 Placement and Curing ............................................................................ 437 Testing for Quality Control .................................................................... 438
Porous Concrete in Successful and Unsuccessful Installations ........................ 439 834 East Ocean Boulevard, Stuart, Florida ............................................ 439 827 S.E. Fifth Street, Stuart, Florida ...................................................... 440
Further Installations on Sandy Subgrades .......................................................... 441 Hobe Sound Sprinklers, Hobe Sound, Florida ...................................... 441 Council on Aging of Martin County, Stuart, Florida ............................ 442 Jones Ecological Research Center, Newton, Georgia ............................ 443
Porous Concrete on Fine-Textured Subgrades .................................................. 444 Southface Institute, Atlanta, Georgia...................................................... 444 Webb Bridge Park, Alpharetta, Georgia ................................................ 447
Porous Concrete on the West Coast .................................................................. 448 Toward Porous Concrete in Cold Climates ........................................................ 450 Trademarks ........................................................................................................ 452 Acknowledgments .............................................................................................. 452 References .......................................................................................................... 453
Porous concrete is made by binding open-graded aggregate with Portland cement. Most of the volume of concrete is aggregate; the cement binds the aggregate particles together. Porous concrete is chemically identical to dense concrete; the defining difference is that porous concrete is made with open-graded aggregate, which creates the voids in the concrete structure.
