The load rate is 35 +/- 7 psi / second. A cylinder that breaks at 4800 psi would take ~2:30 to break at this rate vs 50 psi/minute where it would take ~1.5 hours to break.
This is veeeeeeery interesting … never found such explanation showing relation between moist level and strength ➡️ I subscribe right now and check all your vids 👍🏽👍🏽👍🏽👍🏽
And seriously I think your vid gave me a real scientific opinion about shaolin or JC van damme punching a whole pile of bricks and bursting the one in the middle… I didn’t expect strengthes would spread this way, and more than that I didn’t expect that tool hitting concrete (hydraulic press shaft eg) would create friction force holding the surface together… that’s really amazing 👍🏽👍🏽👍🏽
Thanks alot I wonder how can I be a good engineer with concrete have I memories the all chemical equations or just spent time to understand it and learn more about it and don't care about memories the pages it's real convince me
Great explanation! In the oilfield we use cubes instead. I wonder why that is? Also, compressive strength testing via a UCA (ultrasonic cement analyzer) is more common. With this machine strength is determined by measuring the change in velocity of an ultrasonic signal transmitted through the cement specimen as it hardens. As the strength of the cement specimen increases, the ultrasonic signal’s transit time through the sample decreases. Using proprietary algorithms that have been proven throughout the industry, the relative strength is calculated. We crush samples too but the problem with that is that it does not give us a graphical representation of the strength development like a UCA does as we are interested in more than just long term strength values. For instance, we are often interested in the initial set strength (50 psi). This is good to know for when the rig must tag cement plugs. If cementing conductor offshore (riser-less operations) then the rig will want to know when they can release conductor pipe as the rig will be holding the conductor casing as the cement sets. Typically cement can support pipe when it has achieved 100 psi of compressive strength. Some people will even say that 75 psi is good. The rig will also want to know when they can drill out the tail cement after cementing surface and intermediate casings for example. The drill-out value is recommended as 500 psi. So it’s clear to see that in the oilfield we are interested in more than just the final strength value. Do you ever use a UCA for concrete or would the coarse aggregate affect the test results? In the oilfield if we want to test compressive strength of foam cement we crush test as the dispersed bubbles of air inside the cement will not give reliable results if tested with a UCA. Bubbles in the foam attenuate the acoustic signal, resulting in poor signal quality.
Cubes are also used in the concrete world when you are testing paste. When you add aggregates then you need a larger volume. Strength testing for concrete in Europe is also done with cubes but they are very large. Ultrasonic tests are great if you have a homogeneous material. Once you start to add aggregates then concrete is no longer homogenous. That doesn't mean that you can't use this test. However, it means that it is very difficult to use this test to directly predict mechanical properties. For example, if I use a granite aggregate in one mixture and a limestone in another mixture then these aggregates can make up about 50% of the volume of the mixture. Also, these aggregates have very different properties and so the travel time and speed is also very different. If you want to non-destructively predict the strength gain of concrete then you should use the maturity method. In the laboratory you build a curve where you measure temperature over time and gather compressive strength. In the field, you can then just measure the temperature change of the concrete and then predict the strength. This is very reliable and used where strength gain is very important. There are many projects where this is not a concern.
@@TylerLey can not wait. I've spent two months trying to make light brick. but all my attempts failed. light brick that I made type clc. add lime cement sand and a little gypsum, but still have poor compressive strength. also not floating in water. I don't know what kind of chemicals I have to add to get good quality brick light.
Tyler my name is jim huntley with ChemTec intl. Would you consider looking at our website and the results we have on Astm c672 and 666 as well as 642 and 779 and let me know what you think?
The load rate is 35 +/- 7 psi / second. A cylinder that breaks at 4800 psi would take ~2:30 to break at this rate vs 50 psi/minute where it would take ~1.5 hours to break.
Well, i have watched this thrice. I'm gonna finish watching all of your videos. Deeply thank you, sir.
I am glad you like them!!! Thanks so much.
This is veeeeeeery interesting … never found such explanation showing relation between moist level and strength ➡️ I subscribe right now and check all your vids 👍🏽👍🏽👍🏽👍🏽
great video! loads of information that I needed to know, thanks!
Thanks sir your effort is deeply appreciated ...
I got great knowledges from your videos, thanks
Thanks a bunch!!!
Very Much Thank You!!
And seriously I think your vid gave me a real scientific opinion about shaolin or JC van damme punching a whole pile of bricks and bursting the one in the middle… I didn’t expect strengthes would spread this way, and more than that I didn’t expect that tool hitting concrete (hydraulic press shaft eg) would create friction force holding the surface together… that’s really amazing 👍🏽👍🏽👍🏽
If concrete had good flexural strength without any reinforcement would that be useful and in what ways could it be useful?
Load rate of 20-50 psi/min seemed to be very slow. Is it not 20-50 psi/sec?
Thanks alot I wonder how can I be a good engineer with concrete have I memories the all chemical equations or just spent time to understand it and learn more about it and don't care about memories the pages it's real convince me
Great explanation! In the oilfield we use cubes instead. I wonder why that is? Also, compressive strength testing via a UCA (ultrasonic cement analyzer) is more common. With this machine strength is determined by measuring the change in velocity of an ultrasonic signal transmitted through the cement specimen as it hardens. As the strength of the cement specimen increases, the ultrasonic signal’s transit time through the sample decreases. Using proprietary algorithms that have been proven throughout the industry, the relative strength is calculated. We crush samples too but the problem with that is that it does not give us a graphical representation of the strength development like a UCA does as we are interested in more than just long term strength values. For instance, we are often interested in the initial set strength (50 psi). This is good to know for when the rig must tag cement plugs. If cementing conductor offshore (riser-less operations) then the rig will want to know when they can release conductor pipe as the rig will be holding the conductor casing as the cement sets. Typically cement can support pipe when it has achieved 100 psi of compressive strength. Some people will even say that 75 psi is good. The rig will also want to know when they can drill out the tail cement after cementing surface and intermediate casings for example. The drill-out value is recommended as 500 psi. So it’s clear to see that in the oilfield we are interested in more than just the final strength value. Do you ever use a UCA for concrete or would the coarse aggregate affect the test results? In the oilfield if we want to test compressive strength of foam cement we crush test as the dispersed bubbles of air inside the cement will not give reliable results if tested with a UCA. Bubbles in the foam attenuate the acoustic signal, resulting in poor signal quality.
Cubes are also used in the concrete world when you are testing paste. When you add aggregates then you need a larger volume. Strength testing for concrete in Europe is also done with cubes but they are very large.
Ultrasonic tests are great if you have a homogeneous material. Once you start to add aggregates then concrete is no longer homogenous. That doesn't mean that you can't use this test. However, it means that it is very difficult to use this test to directly predict mechanical properties. For example, if I use a granite aggregate in one mixture and a limestone in another mixture then these aggregates can make up about 50% of the volume of the mixture. Also, these aggregates have very different properties and so the travel time and speed is also very different.
If you want to non-destructively predict the strength gain of concrete then you should use the maturity method. In the laboratory you build a curve where you measure temperature over time and gather compressive strength. In the field, you can then just measure the temperature change of the concrete and then predict the strength. This is very reliable and used where strength gain is very important. There are many projects where this is not a concern.
Tyler Ley thanks for the info, makes sense.
Can you give me a recipe for making high quality cellular lightweight concrete? what chemicals should I add?
Thanks for the question. I am going to make a video about cellular concrete soon.
@@TylerLey can not wait. I've spent two months trying to make light brick. but all my attempts failed. light brick that I made type clc. add lime cement sand and a little gypsum, but still have poor compressive strength. also not floating in water. I don't know what kind of chemicals I have to add to get good quality brick light.
Tyler my name is jim huntley with ChemTec intl. Would you consider looking at our website and the results we have on Astm c672 and 666 as well as 642 and 779 and let me know what you think?
Oops! its 20 to 50 psi/second