With the usage of cars today, it is safe to say that constructing a parking is no laughing matter. If anything, it should be taken seriously, as something simple as a parking lot can change lives for the better. In addition to that, with the existence of electric cars, it leaves a whole lot of place for improvement and offering something new to future clients. Step up you parking lot game by learning more about the latest trends and implementing them in the future parking lot constructions. If you are building or constructing a parking lot for the first time from scratch, these tips will come in more than handy so make sure you use them and make the most of it.
A Sustainable, Viable Parking Lot System
Parking lots built with conventional asphalt or concrete act as impervious barriers, keeping storm water from returning to the earth and causing owners the headaches of disposal and treatment of this precious resource. For this reason, many buildings require additional land for retention ponds, which can be costly and dangerous to maintain.
Pervious concrete, though not a new technology, has recently been revisited as a sustainable parking lot system that addresses storm water collection and may help a project achieve credits within the LEED rating system.
Pervious concrete is an opengraded concrete mixture which contains predominately coarse aggregate and little to no fine aggregate with a cementitious paste that coats and bonds the aggregate together. The resulting mixture typically has a total void content of 15 to 25 percent. The point-to-point contact of the aggregate gives the structure a strength similar to railroad ballast. The paste is created with hydraulic cement, which can be combined with supplementary cementitious components, such as fly ash and slag cement (previously known as Ground Granulated Blast- Furnace Slag). Chemical admixtures to entrain air, improve rheology and suspend hydration are commonly used. The resulting concrete mixture is stiff and rocky and has a low water content and a high surface area, causing it to be highly prone to early moisture loss and making proper placement and curing essential.
pervious-concrete-webWhen designing a pervious concrete section, understand the percolation rate of the native soil is important. The percolation rate determines the depth of the recharge bed, or for most clay soils if the stormwater needs to be directed out of the pavement. The recharge bed is a layer of clean, open-graded, compacted, coarse aggregate, typically 1 inch or greater, with approximately 30 to 40 percent voids. Depending on the native soil, this layer can be from 6 to 24 inches in depth. The recharge bed is designed to hold water passing through the pervious concrete wearing course until it naturally percolates into the native soil. The pervious concrete wearing course is usually designed from 4 to 10 inches, depending on the traffic load of the section.
Success in pervious concrete construction has been found using many application methods, including the use of a weighted, spinning, steel tube or roller screed to form and consolidate the placement. Pervious concrete has also been placed with slip form pavers and screeded with laser screeds. Whatever the method, the section needs to be immediately covered with thick plastic to avoid moisture loss, as the durability of pervious concrete is significantly more sensitive to curing than conventional concrete.
Pervious concrete needs to be maintained. Regular maintenance may include yearly vacuuming or power washing to insure the surface does not become clogged with debris.
Pervious concrete is gaining acceptance throughout the country. In Utah, new pervious parking lots and walks are being constructed each year. Some of the oldest pavements in Utah are three years old. Having been subject to three winters, they are all performing well. Pervious concrete systems have been used successfully in northern climates such as Minnesota, Iowa, and Wisconsin for five or more years. If the pervious concrete system is designed, constructed and maintained properly, pervious concrete pavements can be a truly sustainable paving option.