What are Typical Concrete Requirements for Around the House Flatwork Patios, Walkways and Driveways?
Curing is a chemical reaction between cement and water makes concrete strong and durable. The purpose of curing is to make sure that little or no water is lost from the concrete during the early stages of this chemical reaction.
The newly placed concrete should be covered or sprayed with a material that will retain the moisture within the mix. Membrane curing compounds sprayed on the surface are the materials most commonly used. They are very convenient but they must be applied immediately after the concrete is given its final finish and care must be taken apply them thoroughly and uniformly. Coverings used to cure concrete include wet burlap, plastic sheets and Kraft paper. If burlap is used it must be kept continuously wet. The curing process should be continued for at least 72 hours and twice as long if the temperature is below 50 degrees F.
It is up to the contractor to cover the concrete and start the curing process. But it is usually up to the homeowner to follow through from there and make sure that curing proceeds uninterrupted for the required time period.
Ready-mix concrete is a type of concrete that is manufactured in a factory or batching plant, according to a set recipe, and then delivered to a worksite, by mixing truck . This results in a precise mixture, allowing specialty concrete mixtures to be developed and implemented on construction sites.
Some advantages of Ready Mixed concrete are:
• A better and more consistent quality concrete is produced.
• Elimination of storage space for basic materials at site.
• Elimination of procurement / hiring of plant and machinery
• Wastage of basic materials is avoided.
• Labor associated with production of concrete is eliminated.
• Time required is greatly reduced.
• Noise and dust pollution at site is reduced.
There are several basic requirements for good quality concrete:
• Good materials-cement, aggregate admixtures and water
• Proper proportioning of these materials
• Thorough mixing
• Skilful placing and finishing
• Proper curing
All of these requirements are important, and failure to satisfy any one of them will often result in a reduction in quality. The materials used by Central Valley Concrete are always of the highest caliber; and are from local sources. Multiple tests are conducted to verify that the materials we use meet and exceed applicable specifications required by state agencies.
Another key to having excellent concrete is proportioning the right mixture. Proportioning simply put, is how much of each ingredient is put in each load. A temptation to use too much water generally results from an effort to make placing operations easier for the contractor. Overly wet concrete flows into the forms more readily, is easier to compact and to strike off; making it attractive to work with.
The problem with overly wet concrete resides in durability issues in the long run. With too much water in the mixture, the cement in the concrete batch will become diluted and will not be able to properly bind with the aggregate.
Simply because excessive water makes a more dilute cement paste. Not all of the water in any concrete reacts with cement and when there is an excessive amount of water it leaves small voids in the hardened paste. This makes the concrete weaker, more porous and less durable.
The contractor should provide the ready mix producer with the following basic information: Maximum size of coarse aggregate.
Slump of the concrete. Slump is a measure of how readily a concrete flows. Slump values are determined by test. Increasing the water content increases slump, and a slump that is too high indicates that too much water may have been added to the concrete. A 4 to 5-inch slump will give a good, workable mix. A stiffer mix (lower slump) will usually be more difficult to place and a wetter, soupy mix won't be as strong and durable.
Strength required. In severe climates where concrete will be exposed to freezing and thawing, a compressive strength of about 4000 pounds per square inch (psi) is a common specification. Strength is measured on standard test cylinders cured under standard conditions. A strength of 3000 to 3500 psi at 28 days is adequate for nearly all concrete not exposed to numerous freezing and thawing cycles or to deicing salts.
Air-entrainment. Entrained air is air that is purposely incorporated into a concrete mix, primarily to make the concrete resistant to deterioration caused by freezing and thawing and the use of deicing salts. To be effective for this purpose the air content should be about 6 percent. The air bubbles also make the concrete easier to work because they act as a lubricant. For this reason some builders prefer to use air-entrained concrete for most flatwork around the home, whether or not the flatwork will be exposed to freezing and thawing.
First of all, don't pick him entirely on the basis of cost. In concrete work, as in any business, you get what you pay for. Cost should be a consideration, but it should not be the only consideration. Knowledge, competence, integrity and experience are the qualities to seek in a contractor. To obtain the names of qualified contractors, talk to the dispatchers or friends and family. Then take a look at a few of the contractors' completed jobs, particularly some that were done several years ago. If you like what you see, you can feel easier about seeking bids from them, knowing that they do good quality work.
Good quality concrete-properly proportioned, mixed, placed, finished and cured-will give maintenance-free service for many years. Concrete work, properly done, will usually last much longer than the need for which it was originally installed.
Much of that depends on what the concrete is being used for. In most cases, Fibermesh is an excellent no-hassle solution to providing additional strength. We also suggest using rebar or wire depending on the use.
When you have measured the length and distance of the area you are interested in pouring, free free to use our calculator located on our web site. It can be found here. If you still need additional support or are unsure about an area feel free to call our dispatch center and they will provide an exact measurement for your project.