The ability of a material to resist indention by measuring its depth is what is referred to as hardness. Knoop hardness test is a mechanical testing used on thin sheets especially on materials that are brittle. This test measures material characteristics and functionality.
Procedure of Testing
Optically, the size of the indentation left by the indenter is measured. A test material of a known load is pressed for a given duration (dwell-time), and the indention measurements are taken using a microscope. A pyramid-like diamond point is pressed to create a small indentation into the polished surface of the test material. The lower the indent, the harder the material under test.
Reading the Test
Though not commonly practiced, the dwell time of the test load is at least 10 to 15 seconds. The Knoop hardness testing comprises of, the numeric hardness value (Hardness according to Knoop) denoted as “HK,” and applied test load in “kgf.”
The shallow indentation depth makes the method suitable for testing very thin layers such as aluminum foil. The long and narrow (elongated) test indent is best fit for small, and longish test specimens as well as testing very hard and brittle materials such as glass and ceramics.
To sum up, the Knoop longitudinal diagonal is around three times longer than other tests diagonal. Therefore, it provides higher measurement precision, especially in conjunction with very low test loads. The test is non-destructive, and there is only minor damage to the specimen surface.
It is high time to get started and come up with solutions for sustainability. The construction sector is committed and enthusiastic to work on sustainability. During conferences, there is a lot of talk about the possibilities for sustainability in the sector. However, the challenges are great. There is talk about the climate agreement, PFAS and nitrogen problems that arise during construction; it is therefore clear that everyone is aware of the seriousness of this situation.
Unfortunately, there are no easy and quick solutions. However, solutions have been devised that are a step in the right direction.
Don’t let machines run stationary
Many suppliers are already working on the introduction of electrical construction machines. This includes Adrighem, where we can find electric aerial work platforms. Of course we like to see this progress happen faster. And by investing in alternative fuels, we can make a contribution in the short term. We should not underestimate our behavior either. By introducing the New Turning and stopping the application of idle running a machine, we can reduce emissions. It also has financial benefits. Because these things help to apply smart construction logistics, which can further contribute to reducing emissions.
Another important and major contribution stems from making the current machine park more sustainable. Machines with old Stage III engines must be replaced by new ones equipped with Stage V. However, the industry cannot do this alone, and governments should look more into supporting the industry with sustainable solutions.
Transporting machines from construction site to construction site can also be more sustainable. If you have a project abroad, it is better to rent machines abroad. By renting you do not have to maintain the machines yourself. This saves transport costs, transport emissions and the required machines are faster at the location where you need it. Companies such as adrighem.com offer rentals, also abroad, and also arrange all logistics and maintenance.
Don’t give up
At the project level, too, various governments are prepared to look for solutions together with the sector. We welcome these improvements. These are major challenges, but we hope that the construction sector will work with the government. And get started to come up with more sustainable solutions.
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