Is 4 inches of concrete enough for a driveway?

As for thickness, non-reinforced pavement four inches thick is standard for passenger car driveways. For heavier vehicles, a thickness of five inches is recommended.

cement.org - Driveways - The Portland Cement Association

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A concrete driveway lends itself to a wide variety of design options that can make a dramatic difference in home landscaping and enhance property value.

Why Concrete Driveways?

Concrete is an excellent driveway material. It is versatile, preferred for durability, appearance, low maintenance, and indicates quality construction from the first glance. A concrete driveway does it all. Homeowners take great pride in the exterior of their home. The concrete driveway has become an essential part of a landscaping plan that imparts an inviting image. Concrete’s wide variety of texture, color, or patterns has elevated the driveway to the status of a landscape design element…meeting today’s homeowner’s exacting demands. Not only is concrete functional, it lends itself to a wide variety of design options, which can make a dramatic difference in home landscaping plans, as well as enhance property values. In addition to the traditional look, concrete can have the decorative appearance, feel, and color of brick, tile, slate, or stone. Exposed aggregate is another popular finish. Many other design choices are available that can complement a variety of exterior treatments of the house. Concrete driveways have long been known to give trouble-free service to homeowners. The reason is simple. Concrete is enduring with many driveways last for 30 years and longer without major maintenance. Just as with many high-quality purchases, concrete costs less in the long run. From the street to the garage, a personally designed concrete driveway not only adds visual satisfaction, but also adds long lasting quality and value to your home as well.

Planning

The quality of the completed concrete driveway always begins with good planning. Spending time at this stage can help to eliminate possible problems later on in the construction process. One of the first things to consider is the size of the driveway. The suggested width for a single-car driveway is eight to nine feet, 15 to 18 feet for double width. If the distance from the street to a two or more car garage is long enough, the initial entry approach can be of single-car width and then widened near the garage to accommodate all car stalls. If space is available, extra parking or a turn-around area can be included. Also, the planning stage is the time to consider adding that concrete patio or porch addition. As for thickness, non-reinforced pavement four inches thick is standard for passenger car driveways. For heavier vehicles, a thickness of five inches is recommended. To eliminate standing water, the driveway should be sloped towards the street a minimum of one percent, or 1/8 inch per foot, for proper drainage. Today’s concrete can be formed into practically any shape, texture, pattern, or color. It is a way of adding a new dimension of quality and elegance to your home, at a reasonable cost. Pattern stamping is an colorful way to enhance ordinary concrete paving. Essentially, the driveway is cast-in-place concrete which has been colored and imprinted with a pattern designed to look like brick, tile, cobblestone, or other various patterns. Textured finishes include bromide, swirl, or exposed aggregate.

Site Preparation

When the basic driveway design has been decided, the next step is site preparation. As an example, let’s assume that an existing asphalt driveway is being replaced with a traditional, broom-textured concrete driveway. In brief, this is how a typical site preparation works. The existing thin layer of asphalt is easily removed with a fork-lift truck and carted away. The existing gravel base is reusable, but since the new concrete driveway will be thicker, some of the gravel must be removed to maintain proper elevation. The gravel base is compacted with a vibratory plate compactor. For a new driveway, a gravel subbase is not needed, but the subgrade must be compacted in a similar manner. Lumber side forms are placed and securely nailed to stakes in the ground. These stakes should be no more than four feet apart and support each joint in the forming lumber. Measure for elevation and double check the base to insure uniform slab thickness.

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Match the new driveway level with the existing garage slab and sidewalk. An isolation joint is needed where the drive is to meet these existing pavements. Typically, contractors use 1/4 to 1/2 inch thick premolded joint material to make this joint.

Ordering Quality Concrete

Ready mixed concrete for driveways is normally specified in accordance with American Standards for Testing and Materials specification ASTM C-94. By following the correct specifications and construction methods, it will help avoid problems such as random cracking. For example: Compressive strength - 4,000 psi at 28 days is adequate strength for most climates - 4,000 psi at 28 days is adequate strength for most climates Air content - designate air content with a range of five to seven percent in all climates. In addition to improving the long term durability of the concrete, air content also improves the workability, without the need for adding water. - designate air content with a range of five to seven percent in all climates. In addition to improving the long term durability of the concrete, air content also improves the workability, without the need for adding water. Slump - be sure to designate slump. For driveway paving, specify four inch slump. Slump greater than five inches should definitely be avoided. - be sure to designate slump. For driveway paving, specify four inch slump. Slump greater than five inches should definitely be avoided. Aggregates - designate the size of the coarse aggregate. Generally, 3/4 or 1 inch is normally used. For a slightly higher fee, chert-reduced aggregate can be ordered to help prevent pop-outs. For milder climates, lower strengths and air contents may be appropriate. Consult your ready mixed concrete producer for appropriate mixes in your area.

Placing & Finishing

When placing the driveway, ready mixed concrete should be delivered and discharged as quickly as possible. One to 1½ hours is usually a reasonable time frame. The following is the sequence for placing and finishing the new driveway. Spray or brush all forms with form oil, and moisten the subgrade with water. Do not over water. There should be no puddles or standing water on the subgrade before placing the concrete. The concrete should be placed as near as possible to its finished position, either chuted directly, or into wheelbarrows and wheeled to its final location. Use of shovels is recommended to ensure complete filling along the sides of the forms. Strike off the concrete with a straight piece of lumber to smooth the surface and bring the slab to its proper elevation. Check for any low spots. Another pass with the piece of lumber provides a uniform surface for the following finishing operations. Immediately after strike off, a bullfloat is worked back and forth across the surface to remove any irregularities. Don’t overwork, or the surface may be weakened. At this point, edges can be tooled into the concrete. Surface bleed water must evaporate before proceeding with the final finishing. Properly specified concrete should allow finishing operations to begin almost immediately. A concrete broom is used for the final finish. Before brooming, the surface should be stiff enough to retain marks or grooves left by the bristles of the broom. A trowel finish is not recommended because it could leave the surface slippery and unsafe. The rougher broom finish improves traction. Snap chalk lines to indicate where joints go. Caution: Avoid prolonged contact between unhardened (wet) cement or concrete mixtures and skin surfaces. To prevent such contact, it is advisable to wear protective clothing. Skin areas that have been exposed to wet cement or concrete, either directly or through saturated clothing, should be thoroughly washed with water.

Curing

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Jointing

Curing is one of the most important and also the most often neglected phase of good concrete construction. Poorly cured concrete is more likely to crack and will not be as durable.Curing should last for a least three days, and as long as seven days, if practical. There are several methods of curing, including plastic sheets to cover the concrete, or continuous sprinkling, or applying a special curing compound. Curing should begin as soon as possible after the finishing operations. In areas experiencing colder temperatures, curing procedures may need to be adjusted. Joints in concrete pavements control the location and spread of cracks. They can be hand-tooled or saw cut, and should be made to a depth of no less than one inch for a four inch thick slab. Joints should be spaced no more than 10 feet apart for a four inch slab. Driveways that are wider, 12 feet or more, also require a joint down the center. Panels should be as square as possible, but in no case, should the long side be more than 1½ times longer than the shorter side. Jointing should begin as soon as possible after the finishing operations. If using a hand grover for jointing, proceed when the concrete sustains foot pressure with only a 1/4 inch indentation. If sawed, begin within 24 hours.

Aftercare

Two of the great advantages for using concrete is its durability and ease of care. We recommend applying a high quality sealer on all exterior concrete exposed to freeze/thaw cycles. The sealer helps protect concrete from two things: absorbing moisture and being damaged from numerous freeze/thaw cycles.While there are many brands of curing compounds, sealers and penetrating sealers, here are two examples:There are liquid, acrylic-based copolymers. They are transparent and act as a film over the surface. This type of product has been on the market for years and is widely used due to the value for the money.Penetrating sealers are clear, silane solutions that penetrate deeply and chemically react with cementitious surfaces. They offer the best protection from moisture penetration.There are many different types of sealers and can be applied by brush, roller or by using a low-pressure airless sprayer. Application should be made per manufacturer's instructions.By following these installation guidelines and combining them with good workmanship, you’ll have a concrete driveway that will make a lasting impression for many years.

The Bottom Line is Quality

The quality of a completed concrete driveway is dependent upon the workmanship of the paving contractor plus the quality of the concrete used in the project.Concrete driveways are constructed using ready mixed concrete manufactured locally from portland cement, high quality aggregates, and water.Quality ready mixed concrete, suitable for paving is available from more than over 4,000 ready mixed concrete producers throughout the United States and Canada.

Disclaimer

Portland Cement Association disclaims any and all responsibility for the applications of the principles discussed in this publication or for the accuracy of the sources other than work performed or information developed by the Association.The listing of organizations and information resources constitutes neither an endorsement nor recommendation by the Portland Cement Association (PCA). PCA disclaims any and all responsibility for the selection of organizations listed and the products they represent. PCA also assumes no responsibility for errors and omissions in this list.

cement.org - Driveways - The Portland Cement Association

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