What is meant by pervious concrete?
Pervious concrete (also called porous concrete, permeable concrete, no fines concrete and porous pavement) is a special type of concrete with a high porosity used for concrete flatwork applications that allows water from precipitation and other sources to pass directly through, thereby reducing the runoff from a site …
Why is pervious concrete used?
The high flow rate of water through a pervious concrete pavement allows rainfall to be captured and to percolate into the ground, reducing stormwater runoff, recharging groundwater, supporting sustainable construction, providing a solution for construction that is sensitive to environmental concerns, and helping owners …
How is pervious concrete different from normal concrete?
Pervious concrete is made from carefully controlled amounts of water and cementitious materials used to create a paste that forms a thick coating around aggregate particles. Unlike conventional concrete, the mixture contains little or no sand, creating a substantial void content – between 15 to 25 percent.
What is the strength of pervious concrete?
In general, pervious concrete has pores with sizes in the range of 2–8 mm, the void content is 18%–35% and the compressive strength is 2.8–28.0 MPa (ACI 522, 2010).
How strong is pervious concrete?
In the laboratory, pervious concrete mixtures have been found to develop compressive strengths in the range of 500 to 4000 psi (3.5 MPa to 28 MPa), which is suitable for a wide range of applications. Typical values are about 2500 psi (17 MPa).
Is pervious concrete sustainable?
Pervious concrete pavement is a unique and effective means to address important environmental issues and support green, sustainable growth. Both the low mortar content and high porosity also reduce strength compared to conventional concrete mixtures, but sufficient strength for many applications is readily achieved.
How do you increase the strength of pervious concrete?
Apart from Cement and Aggregate admixtures such as Nano-Silica and Polypropylene are used in this project to increase the Compressive strength and abrasion strength of pervious concrete. Nano silica is added in 5% to 15% weight of cement particles.
How do you strengthen pervious concrete?
The results indicate that high strength pervious concrete (32–46 MPa at 28 days depending upon the porosity) can be achieved through both SCM-modification, using silica fume (SF) and superplasticizer (SP), and polymer-modification, using polymer SJ-601.
How long does pervious concrete last?
20 to 40 years
Properly constructed parking areas utilizing pervious concrete will last 20 to 40 years, according the Southern California Ready Mixed Concrete Association. Just as standard concrete is more costly than standard asphalt, pervious concrete is typically more expensive than porous asphalt.
Does pervious concrete clog?
However, the pore structure of permeable concrete can become clogged by sediment particles and its ability to drain storm-water runoff gradually decreases (Deo et al. 2010. Permeability reduction in pervious concretes due to clogging: experiments and modeling.
What is pervious concrete?
Pervious concrete is a zero-slump, open-graded material consisting of cement, coarse aggregate, admixtures and water. Pervious concrete contains little or no fine aggregates such as sand, it is sometimes referred to as “no-fines” concrete.
What is the composition of a purepervious concrete mixtures?
Pervious concrete mixtures consist of specially formulated hydraulic cementitious materials, water, and uniform open-graded coarse aggregate (e.g., ASTM C33 Size Numbers 5, 56, 67, 8, and 89).
What is the water-to-cement ratio for pervious concrete?
Pervious concrete consists of cement, coarse aggregate and water with little to no fine aggregates. The addition of a small amount of sand will increase the strength. The mixture has a water-to-cement ratio of 0.28 to 0.40 with a void content of 15 to 25 percent. The correct quantity of water in the concrete is critical.
Can pervious concrete pavements be used in cold weather?
Pervious concrete pavement structures that incorporated frost-heave-reducing design features have been used successfully in Norway (Stenmark, 1995). Successful longer term installations of pervious concrete pavements in regions of cold weather also have been documented in North America .