A: It is a patented additive added to concrete without sand. When it is cured, it is a super strong enhanced pervious concrete that can be used as parking lots, roads, sidewalks, patios and more.
A: Very similar to an asphalt application. It is raked, and puddle and then compacted with a roller screed.
A: The pavements made with EcoCrete Enhanced Pervious Concrete™, according to the University of Texas research report allow rain water to flow through it at a rate of 4” per minute or 240” per hour!
A: Under normal conditions in laboratory tests, it has the same life as conventional concrete.
A: Clogging problems are mainly issues of design. If a natural area with grass or exposed soil is allowed to drain stormwater across a pervious concrete pavement, fine material can be introduced into the system causing localized clogging. Vegetative matter can collect on the surface of the pervious concrete causing some clogging, but routine sweeping or vacuuming will restore porosity. Studies have been conducted that indicate pressure washing will restore most of the porosity of clogged pervious concrete to nearly new conditions. However, should the voids become clogged, even at 60% efficient (meaning 40% of voids are clogged), EcoCrete Enhanced Pervious Concrete™ still allows 4” of rainwater to permeate the surface per hour.
A: Typically if a soil type has sufficient percolation to support a septic tank system, it will be sufficient for pervious concrete. If a soil is truly impervious, the pervious concrete system will still be useful for detention pond requirements. Soil percolation rates are most important if you must meet stormwater quality requirements. A typical parking lot design may have 5”-8” of pervious pavement on top of a 6”-12” sub-base of #57 stone (40% voids) on a geotextile fabric. In sandy areas pervious is placed directly above the sand.
A: Pervious concrete has been placed in freeze-thaw climates for over 15 years. Applications of pervious concrete have been successful in freeze-thaw environments due to these two common design features – the cement past is air-entrained, and the pervious concrete is placed on 6-12 inches of drainable aggregate base (3/4” or larger clean gravel).
A: EcoCrete is the industry leader in compressive and flexural strengths, achieving 4,500 psi in compressive strengths and 670 psi in flexural strengths in 28 days.