Predicting the life of concrete
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- Опубликовано: 15 сен 2018
- It is popular in life cycle cost analysis of concrete to compare the cost to the life. By comparing the ratio of these values for different choices then you can compare different alternatives. This video talks about the current procedures that are used to determine the life of concrete structures. Current service life models only focus on corrosion.
A basic description is given for each model and some insight is given on what parameters the models use to determine the service life of concrete. These include the weather, chloride loading, steel properties, and concrete properties. Challenges with the service life models are also discussed. Finally, the video talks about several improvements that could be made to these models in the future.
Two popular models are:
Life 365 (free) - www.life-365.org/
Stadium ($$) - www.simcotechnologies.com/wha...
Thanks to Hailey Goodale! She edited this video and is my Director of Awesome.
My website is: www.tylerley.com
If you would like to donate to my channel please visit www.tylerley.com/giving 
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So you need a study on how concrete fares up to this day. Maybe its something for a thesis of a graduating student. Maybe its something for a masters degree.
Maybe you need to have a financed study by either the government or an institute like the ACI. So models can be worked on and put into effect for everyone to use, or maybe even be put in the local building codes, so a structure will last.
Greetings,
Jeff
Hey tyler. I'm currently working on crack healing using crystalline admixtures. I knw cracks are the kryptonite to our superman (concrete) durability so hopefully these products can prove to work. Great video. Keep t up concrete guru 😀😀😀😀
Good luck with the research! Let me know how it goes.
Hello. this is quite useful as i am currently working on analyzing the residual life of a building with the presence of cracks. it's been quite a challenge looking for applicable information and models that can be used to quantitatively determine the effects of cracks to the service life of a structure.
Hello, I would like to suggest if we can make a tool or mechanism and mix it the concrete and we can identify its present status with regards to corrosion of rebars, covering and others. this is just a crazy idea like if we can make a chip like a usb insert it and you will generate all the basis details of the building like the structural frame and its covering, we make use of the rebars to navigate a 3d view of the whole section of the building. hope this helps...thank for the videos.
Isn"t there an ASTM weatherability test using a salt spray with freeze-thaw temperature cycling with a compression test to destruction every x number of cycles enabling a guesstimate to life-cycle?
Douglas - There is ASTM C666. It is a freeze thaw test but there is not spraying. The test runs for 300 cycles but doesn't predict life. You either pass or you don't and people don't really know what that means as far as service life. There is the ASTM C672 test. This uses concrete that is ponded with salt solution and there are freeze thaw cycles that are applied to the concrete. Typically, the test is run for 50 cycles. That doesn't really relate to service life.
Is the reason for no mix standard service life testing due to the implied liabilities?
I would think a salt spray chamber with freeze-thaw cycling a great test (setup re ASTM B117) See:ruclips.net/video/mDxvmMucGfA/видео.html which eventually correlates to X cycles = Y years of service life.
I don't think so. I think we don't have enough knowledge of many of the durability mechanisms to create mathematical models to describe them. I am working on a model for freeze thaw damage but there are still issues.
Yeah but the weather is different in different environments. How much salt that is applied is also different. Also, there are so many different types of durability failures. This would just test salt spray. Think about trying to predict how a human will die. There are so many possible ways! How do we predict this? It depends on a lot of things that are so hard to predict or control.
Sir,
I have one doubt.
Can we compare the concrete by calculating their service life using existing models? For example, we have 5 different mixes of concrete and then we determined the chloride threshold values,diffusion coefficients of these concrete. Then we calculated the service life with this parameters by using existing models. So finally, we can choose the concrete mix which having longest service life. Is it possible??
Yes! That is what people do today. However, what if the failure is caused by freeze thaw, sulfate attack, ASR, or DEF. How do we deal with cracking? How do we know how much Cl will be placed on the concrete? We can measure diffusion coefficients in the lab but are we really getting that in the field? Chloride threshold levels are hard to measure and there are a lot of different parameters that impact it.
@@TylerLey Yes Sir..It will not be a realistic value...Thanks for the information.
I’m super into saving money and would consider myself a personal finance guru. The problem with humans is they look at short term costs rather than long term costs. We’re doomed.
It is hard to overcome!