I love how you are pushing to improve not only the concrete itself but also find more accurate and efficient ways to test the material. You are a GREAT mind to have in the industry.
Thank you so much!!!! I am so excited to have people like you in the industry that are willing to watch videos and share them with others!!! Take care!
The variations in concrete are always a problem. For some reason this reminds me of a bridge that I replaced around 1991. It was cast in place reinforced concrete built in 1938. When I inspected the bridge, most of the lower rebar mat was exposed due to delamination of the lower concrete cover. The rebar was very corroded. I had to post the bridge, which didn't stop any trucks but relieved the town of liability. I replaced it within 6 months. I wasn't sure if the corrosion was caused by moisture from above or the stream below. A group of Civil Engineering Seniors from UCONN got to use the bridge as their senior design project. Good Luck, Rick
Thanks Rick, This might be caused by low cover on the lower reinforcing bars. Once chlorides start to reach these bars then they will start to corrode. These tests can help you design great concrete to resist the chloride penetration but we still need to make sure we have the right spacing between the rebar and surface during construction. Thanks for the comment!
@@TylerLey my brother in law is a general contractor and I am going to watch him pour a pad tomorrow and cannot believe the temperature will be in the 20° highs and single digit lows and they just a few chemicals and blankets and it will be just fine.
At the very first of the video, you said "If you want to have Great Dreamcrete, you gotta have Great Permeability .... That is the key to Durability, at least one of them." I am a little confused. From my college days, we were taught "Great" often means "More," probably from the Latin Language. May I assume this was merely a "Slip of the Tongue?". I was thinking we need Less (NOT More) Permeability to have better Durability. Does the Permeability "Decrease" as the Electrical Resistivity "increases" as measured in OHMS? The instrument pictured looked as if was based the instrument for Electrical GeoPhysical Surveys. THANK YOU for sharing this interesting Video & Information Dr. Ley.
I think that is a great idea! I will put it on the list. For a beginner, I would start with "Design of Reinforced Concrete" by Mcormac and Brown. It is about 7y old but I still think it is the best. There are few new things in the code that it doesn't talk about but it isn't a big deal.
I see that now it's time to look into the Chloride Penetration Resistance of Concrete. I have seen the so called rapid migration test (CTH test) where you apply a voltage over two electrodes to accelerate the penetration. There's more to it because the current has to be within certain intervals.
Yes! I have a student working with that test right now. We are benchmarking the test and we have a new twist on it to make it easier and more rapid. We will see how it all works out! Thanks for bringing this up!
Tyler - LOVE your work ! I'm trying to convince my lab to use some kind of release agent when making Concrete test cylinders - I don't see where the ASTM "prohibits it" - can you tell me what works for you??
We use a release agent on the inside of all of our molds. It is not prohibitive by ASTM. I have some videos on form oil and their impact on concrete. Maybe they will help! Good luck!
Sure! If you want your concrete to transfer electricity. I once tried to turn concrete into a battery. It worked, but it wasn't really strong enough to do anything with. Also, if you want your concrete to allow water and chemicals to pass through it like permeable concrete.
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I love how you are pushing to improve not only the concrete itself but also find more accurate and efficient ways to test the material.
You are a GREAT mind to have in the industry.
Thank you so much!!!!
I am so excited to have people like you in the industry that are willing to watch videos and share them with others!!!
Take care!
The variations in concrete are always a problem. For some reason this reminds me of a bridge that I replaced around 1991. It was cast in place reinforced concrete built in 1938. When I inspected the bridge, most of the lower rebar mat was exposed due to delamination of the lower concrete cover. The rebar was very corroded. I had to post the bridge, which didn't stop any trucks but relieved the town of liability. I replaced it within 6 months. I wasn't sure if the corrosion was caused by moisture from above or the stream below. A group of Civil Engineering Seniors from UCONN got to use the bridge as their senior design project. Good Luck, Rick
Thanks Rick,
This might be caused by low cover on the lower reinforcing bars. Once chlorides start to reach these bars then they will start to corrode. These tests can help you design great concrete to resist the chloride penetration but we still need to make sure we have the right spacing between the rebar and surface during construction. Thanks for the comment!
Just poured footers and foundation for our house with fox blocks and learning so much.
👍🧱🔨📐
I am glad things are going well!
@@TylerLey my brother in law is a general contractor and I am going to watch him pour a pad tomorrow and cannot believe the temperature will be in the 20° highs and single digit lows and they just a few chemicals and blankets and it will be just fine.
Amazing channel and info as well! Regards from Mexico!
Thank you!
At the very first of the video, you said "If you want to have Great Dreamcrete, you gotta have Great Permeability .... That is the key to Durability, at least one of them."
I am a little confused. From my college days, we were taught "Great" often means "More," probably from the Latin Language.
May I assume this was merely a "Slip of the Tongue?". I was thinking we need Less (NOT More) Permeability to have better Durability.
Does the Permeability "Decrease" as the Electrical Resistivity "increases" as measured in OHMS?
The instrument pictured looked as if was based the instrument for Electrical GeoPhysical Surveys.
THANK YOU for sharing this interesting Video & Information Dr. Ley.
Love the shirt Bro! Regards from Philippines!
Thank you!!!! Take care!!!
Dr tyler, can you please make a video about your favorite textbooks on reinforced concrete design. Thanks
I think that is a great idea! I will put it on the list.
For a beginner, I would start with "Design of Reinforced Concrete" by Mcormac and Brown. It is about 7y old but I still think it is the best. There are few new things in the code that it doesn't talk about but it isn't a big deal.
I see that now it's time to look into the Chloride Penetration Resistance of Concrete. I have seen the so called rapid migration test (CTH test) where you apply a voltage over two electrodes to accelerate the penetration. There's more to it because the current has to be within certain intervals.
Yes!
I have a student working with that test right now. We are benchmarking the test and we have a new twist on it to make it easier and more rapid. We will see how it all works out! Thanks for bringing this up!
Tyler - LOVE your work !
I'm trying to convince my lab to use some kind of release agent when making Concrete test cylinders -
I don't see where the ASTM "prohibits it" - can you tell me what works for you??
We use a release agent on the inside of all of our molds. It is not prohibitive by ASTM. I have some videos on form oil and their impact on concrete. Maybe they will help! Good luck!
Is there applications where having a high conductivity concrete is a good thing?
Sure! If you want your concrete to transfer electricity. I once tried to turn concrete into a battery. It worked, but it wasn't really strong enough to do anything with. Also, if you want your concrete to allow water and chemicals to pass through it like permeable concrete.
How about better compacting? Couldn't that be significant?
👍
Thanks!!!!
Is there a different type of rebar that isn't steel?
Yes - Watch my video on FRP reinforcement to learn more.
@@TylerLey Thank you sir I greatly appreciate it