When it comes down to construction sites, it’s needless to say that voids can be extremely dangerous. That’s because one crack or void can cause destruction of the entire building, which can lead to loss of money as well as people. For this purpose, machines like void scanners are used because they help locate the voids. If you want to know more about it, we have the details!
What Is a Void Scanner?
This is a specialized instrument, which has been integrated with a time-of-flight laser measurement. This measurement is used for mapping the shape, spatial locations, and position of the voids. This way, it can help improve the safety of personnel working at the construction sites. For this reason, it’s used at underground sites.
To ensure more productive and profitable mineral extraction, Void Scanner+ data is used. You may more effectively track development, enhance planning, cut down on waste, increase extraction, and shorten project timelines using precise, current site maps.
Boost Project Capacity
The Void Scanner software now allows you to scan from many locations and view the resulting scans together in real time for an accurate 3D representation of the site. This is known as multi-station project capability.
Reduce The Dangers To Safety
Operators can withdraw to a safe location and yet examine findings during scanning thanks to flexible deployment choices of a void scanner and wireless transmission to the PC provided by the optional Wi-Fi box.
Enhancing Site Management
By comparing the scanned stop with the design data, Void Scanner data may be used to more effectively monitor and manage ore loss and dilution. In order to aid in decision-making, scans also give a record of daily productivity.
Quick setup and simple operation are essential for those who use Void Scanner+ for daily void volume calculations. Ten minutes is all it takes to unpack the system, connect cables, mount the boom, and ready the software.
Speed Up Decision-Making
Each Void Scanner+ data point has XYZ coordinates to allow accurate geo-referencing with the mine’s coordinate system. This means that scans can be stitched together in real time through a void scanner for an instant visual of the site.
Reduce Scanning Times
With a 200 points per second scan rate, a horizontal scan extent of 360°, and a vertical scan extent of 270°, the Void Scanner+ enables you to complete a detailed scan of 1˚ increments in under 12 minutes.
Tips To Achieve A Smooth Concrete Surface
It is possible to fix those surface voids with a void scanner to get a smooth concrete surface finish, but this is costly, and we think it is better to prevent this problem. We want to assist you in this, and we have listed some tips that can help you get a smooth concrete surface. There are various variables that affect the surface finish, so keep in mind that the following tips that are given may not ensure the full elimination of surface voids.
Surface voids such as pinholes and air bubbles are caused when air is entrapped during the curing of the concrete. Changes to the concrete mix design may be required to ensure the correct viscosity for the application. The type of product/mold/compaction will have a direct impact on the mix viscosity required.
Increase the time that is spent on mixing the concrete through the void scanner. When the mixing time is extended, air and water break up in the process. As a result, the concrete mix will be more consistent.
Tip # 3
The vibration of the concrete has an influence on the elimination of surface voids. By vibrating the concrete either inside or outside of the mold, the vibration moves residual water and air to the surface of the concrete. You can even keep an eye on the void scanner.
Use aggregate that does not have irregular pieces in your concrete mix. When the aggregate is more uniform, the concrete will become more fluid, so the chance that water and air can get trapped decreases.
Use the correct method of placement and you can use the void scanner for help. Sometimes, slowing the placement method can stop extra air from being trapped in the concrete as the formwork is being filled. Some forms like columns may be better filled either by pumping from below or with the use of a tremie pipe. Sometimes, filling a form too fast can also cause the concrete to segregate, which can cause more surface voids.
Use the correct release agent for the removal of the concrete from the molds after you’ve checked it on the void scanner. This needs to be applied in the correct manner, otherwise, puddling will occur. These puddles can entrap air and water, stopping them from being removed by the vibration process. The application of the release agent needs to be done very accurately and as thin as possible. If it’s your first time using a void scanner, you can hire a professional to help you.
Usually, a thinner coating of release agent will ensure that air can easily migrate along the formwork to the surface of the concrete. Thicker oils will sometimes cause air to become trapped against the concrete surface and the formwork, causing surface voids.
Different Ways to Detect Voids in the Surface?
To find out where and how big holes are under concrete slabs, different NDT methods can be used. In this part, we’ll talk about how these NDT methods can be used to find possible holes in addition to a void scanner.
1. GPR (Ground Penetrating Radar)
A popular way to find holes under concrete slabs is with ground-penetrating radar (GPR). This is different from a void scanner because GPR is an easy and inexpensive way to quickly screen big slabs of concrete. The test is usually short, and you don’t need to do much to prepare. The GPR can tell you a lot about where possible holes (sinkholes) might be under the concrete blocks or pavement system.
To get a good scan on GPR rather than a void scanner, you should carefully look at a few factors, such as the amount of moisture on the surface, the unevenness of the concrete, and the high heat (especially if the scan is being done outside during the warm months).
2. Impulse-Response Method
The impulse response method is a quick, cheap, and non-destructive way to check the state of structures that look like plates made of concrete. The test tells us a lot about how likely it is that something will break and helps make sure that the quality of concrete repair and recovery is high.
Stress waves are used in the Impulse Response test method to check the state of concrete slabs, pavements, bridge decks, walls, and other structures that look like plates. It can also be used to figure out where and how big problems are under the slab.
3. Ultrasound Pulse-Echo Tomography
Ultrasonic Pulse Echo is a non-destructive testing (NDT) method for looking for targets below the surface of concrete. Acoustic stress waves are used by UPE methods to study the properties of layers below the surface. Any change in the acoustical impedance that is not normal for concrete is used to find flaws.
You can use UPE to check the state of concrete slabs and pavements, especially to find holes or signs of wear and tear below the surface. The information helps in figuring out how bad the damage is, finding possible weak spots, and making choices about how to maintain or fix things.
It is suggested that more research be done, like coring or visual inspection, to prove the results and make sure there are voids. These techniques can help confirm the GPR readings and give a fuller picture of the voids.
Why Are There Voids On The Surface?
There are a lot of different factors that can influence how the surface of your concrete turns out. Entrapped air, the inappropriate application of release agents, and excess water within the concrete mix are the three primary culprits most frequently responsible for surface voids.
When air is trapped within the concrete mix, it can cause problems in the form of blowholes and air bubbles in the finished product. Void spaces will appear on the surface of your concrete because air does not combine well with water and cannot escape the concrete mixture once it has been added.
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Release agents in concrete are another factor that might lead to voids on the surface. The lower ends of the molds can fill with puddles of oil when release agents are not applied correctly, or the release agent may not be designed for the application. This results in the surface of the concrete having holes in it.
A similar problem may arise whenever there is a buildup of moisture in the mold. During the curing process for concrete, some of the water can evaporate. This is particularly common in concretes with a greater water-to-cement ratio.
Preventing Voids in Concrete Surfaces
Voids are extremely common when it comes down to concrete surfaces and it’s needless to say that they can ruin the floor’s look. That’s because they look like air bubbles (some people call them pinholes, so make your choice). For this reason, you must prevent voids because they damage the aesthetics and have a negative influence on sturdiness as well. So, let’s check out some ways to prevent voids!
Take Note Of Changes To The Concrete Mix
For concrete gaps to form, air must be trapped inside the concrete while it cures. Any changes you make to the concrete mix can change how thick or thin the concrete is. It is important to know about these changes so that you can get the right thickness when you are applying. If you have the right viscosity, air will be much less likely to get stuck during the curing process.
Adding More Time to Mix Concrete Mold
Increasing the mixing times helps break up any bubbles that form and stops the concrete from getting too airy. Since the mixing time has been lengthened, the air and water in the mixture can separate. The concrete mix will be more even in the end than it would be if it was mixed for less time. Doing any of these things lowers the chance of having to fix holes in concrete.
Using Sound Waves
It is possible for vibrations to stop surface gaps from forming. If you shake the mold, any extra water or air will rise to the top of the concrete mix. Because of this, vibrations are a great way to keep the concrete from getting surface voids. This saves time and money because you don’t have to fill the concrete spaces, which would take more work.
Using the Aggregate
When you use more regular aggregate, the concrete has a smoother texture. Because the structure has changed for the better, there is much less chance that air or water will get stuck in the concrete mix. When you mix concrete, it’s important to use gravel that doesn’t have pieces that aren’t supposed to be there. If you do this step, you will never have to fill in concrete holes again, which can be expensive.
Use the Right Way to Use Concrete
When putting down concrete, this process can easily lead to holes in the concrete. Putting down concrete the right way is very helpful because it greatly reduces the chance of any holes appearing. By moving more slowly, you can keep any extra air from getting trapped in the concrete while the placement method is going on. When you speed up the process of putting down concrete, it can split, which makes more holes in the surface. If you use the right method for placement, you can be sure that surface gaps won’t affect the concrete surface.
Pick the Right Release Agent
To remove concrete from the molds that make the concrete, it’s important to use the right release agent. Puddling can happen in the concrete if this isn’t done right. Any air and water that get trapped by paddling can’t be cleared during the vibration process we talked about above. For the best results, the release agent needs to be used carefully and in a thin layer. When it is sprayed thinly, it lets air escape from the concrete and stops air bubbles from forming.
This lowers the chance of having to use a concrete crack filler or void scanner by preventing holes in the concrete. Taking these precautions ahead of time is the best way to make sure that you won’t have to fill concrete holes. This is the best way to put down the concrete and make it work well.