Note: A newer version of this document exists. This document was replaced by View Notes – R Guide for Design & Construction of Concrete Parking Lots from CIVE at University of Louisiana, Lafayette. ACI R Guide for. The Gold Standard for Concrete. Parking Lot Design. • Goals: 1) Why use ACI ? 2) Basic elements of ACI R 3) To magnify need to use ACI over.
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Concrete parking lots are a potentially lucrative market for concrete contractors and make good economic sense for building owners.
When you throw in the other advantages of concrete, especially the long-term costs, it is, as contractor Len Swederski says, a 330r01. A concrete parking lot is really nothing more than an exterior slab on ground or slab on grade.
Perhaps what defines it as a parking lot, and what makes it a little different to design and build, is the sloped surface for drainage, the ability to handle heavy vehicular loads, and severe environmental exposure. Concrete parking lots make sense for many applications.
Wisconsin Ready Mixed Concrete Association. Let’s look at how to design and build concrete parking lots and also why concrete parking lots are preferable to asphalt. Contractors need to understand the advantages of concrete parking lots in order to clearly justify them to their customers. While the initial cost of installing asphalt is still less than that of concrete, rising asphalt prices have narrowed the gap some.
When these factors are considered, concrete wins the race. Even structurally equivalent asphalt pavement that is designed to have the same load-carrying capacity as concrete and has an initial cost that is comparable to concrete, will still need to be resealed and resurfaced. Over its lifetime, the most expensive pavement is a typical asphalt pavement which is cheaper to build initially, but is under-designed in load-carrying capacity and ends up with high maintenance costs.
The pavement designer can use this nomograph and an iterative technique to come up with the pavement thickness based on the subbase strength and the anticipated loads. When comparing parking lots to other concrete applications, they are obviously subjected to higher loads than floors.
The loads are mostly static or low speedso flatness and smoothness are not as critical as for streets and highways.
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With a parking lot, a good subbase, proper thickness, drainage, and traction are more important. The nomograph shown here will yield a design thickness knowing the subgrade reaction kthe expected loads how heavy the vehicles will beand the xci of load repetitions expected over the year pavement life.
This pavement drains to a low trough that discharges to a drainage structure at the edge. A well-thought-out jointing pattern will prevent random cracks. Parking lots are thickened at the edges, either by excavating the subbase or with a curb, to support the loads.
When thinking about the conditions a parking lot pavement needs to withstand, imagine a parking lot in Michigan in January, or other areas that are exposed 3330r-01 freezing and thawing, deicing chemicals, and heavy loads. Any of these factors can, and will, destroy concrete that is installed with a mix that isn’t properly proportioned. The primary concern with materials should be durability. Pavement durability relies on a good surface layer, freeze-thaw resistance and overall strength.
Generally, in freeze-thaw areas where deicing salts are used, psi should be the minimum compressive strength for a parking lot. However, the real strength issue is the flexural strength rather than the 330r-10 strength, since pavements need to resist bending and cracking more than crushing.
Concrete parking lots aren’t just standard concrete anymore. Here are a few innovative alternatives:. Concrete that drains is an environmentally friendly paving alternative that allows storm water to drain through rather than run off.
Get more information on pervious parking lots. Placing a thin layer of concrete over a deteriorated asphalt pavement is only fair, since the asphalt guys are always putting asphalt on top of concrete. This has been done very successfully, typically called ultrathin whitetopping or UTW. A 3- to 4-inch-thick layer is placed over a milled asphalt surface. Joints are cut on a 3- to 4-foot grid. RCC is a great option for heavy duty pavements, such as truck parking lots, container shipping areas, and military vehicle storage.
For RCC a zero-slump concrete is placed with dump trucks and rolled with heavy 330r-10 steel rollers. These road surfaces are only for low-speed traffic and base courses. Learn more about roller compacted concrete. As with any slab, there are several ways to construct concrete parking lots.
The simplest but least precise method is to simply wet screed the concrete to the desired thickness. Setting side forms and using hand screeds, truss screeds, or other vibrating screeds is another option, and probably the most common. Slipforming is fast and produces very high-quality pavement, although the equipment is expensive and positioning the equipment is difficult except for on very large lots. Another qci is to use a Laser Screed with a 3-D attachment that can place concrete precisely and rapidly.
Broom finished thin overlays add skid resistance and upgrade a deteriorating concrete surface. A truss screed is a good way to place parking lot pavements.
Joint sealing is only necessary 330f-01 the joints are wide. Courts and Cracks, Effingham, IL. When you leave the jobsite, make sure the owner understands what needs to happen to keep the parking lot in good condition.
With concrete, it’s easy! There’s quite a bit of information on the web about concrete parking lots. Here are a few of the best places:. Concrete Parking Lots Learn the advantages of concrete parking lots and the special requirements for design and construction By Bill Palmer, ConcreteNetwork.
Walking in Acci Arbor in winter.
R Guide for Design & Construction of Concrete Parking Lots
Lack of entrained air in this concrete led to severe surface spalling. The 3-D Laser Screed 30r-01 profile concrete pavement to precise slope requirements. Poor compaction can lead to soft spots that crack the concrete. Find Decorative Concrete Contractors. Maximum distance between joints, ft.