Concrete is one of the most compact and durable materials you can use to construct structures around your home. With a concrete slab, you will stay lest assured that you will have a mind-blowing structure in your American home for many decades to come.

In the world we are in, even the legendary human beings of all times such as Mother Teresa had their own flaws. Nothing created by nature or man comes without its set of drawbacks. Even with its astounding capability to stay for long, a concrete slab is prone to cracking. Most homeowners who have invested in it will get annoyed and start causing their contractors for a shoddy job when the slab starts to develop visible cracks with time.

The question commonly asked is; why does a concrete slab crack? Actually, it is not always because of a shoddy job or lack of skills. It is because of either of the following reasons.

Having excess water in the mix

Even the best concrete contractor in America will tell you that concrete does not require a lot of water in order to achieve its maximum strength. However, most contractors add a lot of it while laying concrete slabs because their dream is not to achieve strength, but to make it easier to install, finish the job fast, and secure a new contract. This is a dangerous move.

A concrete slab with excess water will dry, harden, and shrink hence causing visible cracks. To avoid this, make sure you choose a reputable concrete contractor, who will have enough manpower and skill to stir a stiff mix and build you the home of your dreams. Most importantly, have the knowledge about how much water can be poured into concrete, information that is readily available over the internet, and then go for a contractor who will dedicate all the time for your project.

Rapid drying of the concrete

For a concrete slab to realize its maximum strength, it must be allowed ample time to dry. If you are in haste to put up your structure, you might end up using a concrete slab that has rapidly dried, which increases the possibility of cracking within a short time. To avoid this, make sure you give the slab adequate time to completely cure.

Pouring concrete with improper strength poured

Concrete comes with different strengths. A concrete slab that will come with an improper strength is prone to cracking, thus you should verify its strength before pouring.

Pouring concrete on frozen ground

This is another cause of cracks in concrete. If you pour it on frozen ground, it will absorb excess water, thus making it weak. As it dries, massive shrinkage occurs which is a major cause of cracking.

Lack of control joints

Control joints will help the concrete slab crack where you want it to. If you don’t install them, your slab will crack at will and you might end up spending a lot on repair and maintenance.

These are some of the factors that cause your concrete slab crack. You don’t have to always blame it on your concrete contractor!

From time to time, our house’s concrete pathways, walls or patios may encounter minor damages, and instead of calling on a professional to fix it, we can always do the job on our own as long as we have the right materials and knowledge. Listed below are the step by step procedures in repairing or fixing minor damages either in a concrete floor, pathway or wall. These concrete repair tips from AAA Concreting should help you fix your own minor repair jobs.

  1. Before starting any cement-related job, always wear eye protection and waterproof gloves. Always start with a clean concrete, remove any dirt, dust or oil on the surface of the concrete. If there are parts of the concrete which are flaky, remove these with the use of a hammer and a chisel. It is also advised to scrub the area that needs repair with a brush and then rinse.
  2. Prepare your vinyl concrete patcher by mixing 5 pounds of the vinyl concrete patcher in 10 ounces of water. Take note that in order to facilitate better mixing, the patcher must be added to the water and not otherwise. Make sure not to add too much water because this will make the vinyl concrete patcher weak.
  3. With the use of a margin trowel, mix the vinyl concrete patcher for 3 to 5 minutes until lumps are no longer visible. Let the mixture stand for 5 minutes undisturbed.
  4. Before applying the vinyl concrete patcher, remix the mixture and add small amounts of water until you achieve a putty consistency. Once the mixture has begun to set, stop adding water.
  5. Before applying the mixture, saturate the repair area by dampening it with enough water. Take note that any excess water must be removed because this will affect the efficacy of the vinyl concrete patcher.
  6. Using a margin trowel again, apply the vinyl concrete patcher in layers. The first amount of the mixture that is applied must be firmly pressed in the repair area. Once the first layer was applied properly, make sure that its surface is smooth so that the vinyl concrete patcher is leveled with the surrounding concrete.
  7. After applying the mixture, the repair area must be left undisturbed for a maximum of 3 days.
  8. In cases of smaller aesthetic concrete repairs, and if the temperature is between 50 to 90 degrees, a concrete patching compound may be used. Prepare this by simply stirring the concrete patching compound with a margin trowel or a putty knife.
  9. Apply and spread the concrete patching compound properly in the repair area making sure that it is even with the concrete surrounding it. If the cracks you are repairing are more than ¼ thick, the concrete patching compound must be applied in layers. Let the first layer dry before applying the next layer. You may also wet the margin trowel to have a smooth finish of the repair.
  10. Unlike the vinyl concrete patcher, the concrete patching compound will begin to dry for about 20 to 40 minutes and it will harden completely after 1 to 2 hours.

For bigger damage we always recommend that you call an expert concrete contractor, such as AAA Concreting.

A lot of people have never had to hire a garage door repair company before. Because of this, many people are clueless as to what they should look for.

However, if you take the time to look at a Garage Door Experts ABC review, you will see exactly what a skilled repair company should offer. You will learn why this company is the ideal choice for your garage door repair job.

garage door repair

1. They Work Quickly

A broken garage door can be a huge source of frustration. You won’t want to wait weeks to get it fixed.

If you look at a few reviews, you’ll see that Garage Door Experts ABC works very quickly. Once you call them, they’ll come out right away and get your door taken care of. Your problems will be resolved in no time at all. You’ll be able to use your garage normally again.

2. Their Prices Are Affordable

There are some garage door repair companies that charge a lot of money. They know that people are often desperate when they hire repair companies, and are willing to pay premium rates in order to get the problem resolved.

Thankfully, if you look at reviews for Garage Door Experts ABC, you will see that their prices are very fair. They don’t overcharge for their services. They make sure that their rates are affordable to customers. More importantly, they ensure that their customers get their money’s worth when they hire them.

3. They’re Easy To Work With

There are some companies out there that do excellent work, but are a challenge to work with. They may not show up when they say they will arrive, or they may not provide customers with the kind of paperwork they need. Working with a company like this can be a huge headache.

Garage Door Experts ABC wants to make the repair process painless for customers. They are reliable and are always willing to answer questions. If you work with them, you will have a positive experience from start to finish.

4. You Don’t Have To Worry

A lot of people feel sick when it comes time to hire a repair company. They think about everything that could go wrong as the problem is being resolved.

If you read a Garage Door Experts ABC review, you will know that you don’t have to worry. Other customers love working with them, and you will love to work with them to.

It’s nice to be able to feel confident about the companies that you work with. Don’t hire someone that has a poor reputation; hire someone that you can really count on.

As you can see, reading reviews can really be beneficial to you. If you’re worried about your garage door, read a few reviews for one of the best companies in the business. From there, call up Garage Door Experts ABC and have them take care of your garage door. They will get the problem resolved right away.

A state of the art Smartphone such as the iPhone 4 or Samsung Galaxy S2 is loaded with various sensors, such as motion sensors and accelerometers, a gyro, a camera (or two), a microphone, WiFi and Bluetooth radios (which can be used both for communication and for sensing RF signals), Near Field Communication (NFC), a touch screen, etc.

In addition, they are increasingly equipped with high performance processors, such as the 1.2 GHz dual core Cortex-A9 processor of the Galaxy S2. And of course, these phones run a fully-fledged operating system and modern developing languages such as Java. All this comes with a price tag of $500-$900.

Compare this with modern mote sensing nodes, having a memory of a few Megabytes, a terribly slow processor, and running a special purpose OS like tinyOS, which requires unique programming skills and development environments, while priced at $100-$150, with each sensor costing an extra few bucks. Given the economy of scale of smartphones and the tough competition in this market, their prices are likely to be halves within a year, as new models come in. Moreover, when cellular communication in not important, one can settle for the Galaxy S WiFi for around $400.

Given the cost of programmers, with the exception of extremely large deployments, it is cheaper to use smartphones than sensor nodes. In terms of lifetime, sensors can typically survive longer than smartphones. Yet with an extra battery, one can dramatically prolong the latters’ capabilities as well and still be affordable.

Even more interesting is the ability to utilize smartphones for crowdsourcing sensor networks. Consider for example earthquakes. When an earth quake occurs, naturally all phones in the area will shake.

Hence, by having all phones that shake beyond some threshold report to a cloud server both the magnitude and nature of the shaking as well as their position, either over their data channel  or by SMS, the server could compute whether an earth quake is happening and what its magnitude is. Based on this, warnings can be sent out to other areas to prepare for the earthquake, e.g., by shutting elevators and power plants, securing hard disks of important computers, and the likes.

Similarly, mobile phones can be crowd-sourced to detect noise hazards, excessive RF radiation, etc. One company that already does something along these lines is Waze, which crowd-source mobile phones to detect traffic jams. I am sure others will soon follow.

It seems to be bon-ton these days to talk about the end of Moore’s law. While originally stated for the number of transistors stored on a given area of silicon, it has been quickly extended to CPU clock speed and performance as well.

In general, for a long time, the number of transistors in a CPU and its clock speed used to double every 1.5 to 2 years. All this was going on until around 5 years ago. Due to laws of physics, the heat and energy grow roughly cubically in the clock speed and so increasing the clock speed above 3 GHz seemed impractical.

As a result, rather than increasing the clock speed, chip manufacturers opted for increasing the number of cores in a CPU, thereby increasing the theoretical performance by adding parallelism rather than by increasing the clock speed.
Yet, even this trend may soon be put to a serious challenge, as the distances between transistors quickly become smaller than the minimal required by CMOS technology.

All this is great news for computer science in my opinion. For a long time, people got used to being lazy. If computers become twice as fast every 1.5 to 2 years, there is no point in investing much efforts in writing efficient code.

If something does not run fast enough, simply wait for the next generation of Intel x86 and everything will be resolved. In particular, CPUs became fast enough that traditional programming languages and efficient data structures and algorithms were being abandoned in favor of high level scripting languages whose most sophisticated data structure is an associative array. Suddenly, every Joe-hoe could become a programmer developing sophisticated Web applications with no effort  – no need for hard earned computer science degrees anymore.

All these could change back with the end of Moore’s law. As CPUs become parallel, programmers need to learn how to write parallel code and deal with all the intricacies of concurrent execution. They need to understand how the system executes their code, dealing with memory consistency issues, avoiding synchronization in order to facilitate parallelism etc.

There is suddenly great demand for innovation in compiler technology for automatically parallelizing sequential programs. Programming models are suddenly an important topic again. Data structure libraries need to be parallelized in an efficient and scalable manner. Operating systems must be redesigned and re-architected to make an effective use of the many cores that are put at their dispense.

Moreover, as the number of transistors might be reaching a limit, this means that even the number of cores on a CPU will likely be limited. Also, given Ahmdel’s law, the maximal benefit from parallelism is in any case quite limited. Hence, writing efficient code will suddenly become important again. For this, strong background in computer science is a must!

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