Paving the road of the future. Part 1 of 2
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- Опубліковано 29 лис 2024
- Precast / Prestressed Concrete Pavement. Field demonstrations of FHWAs system for Precast Prestressed
Concrete Pavement used by a number of State DOTs.
The video examines the feasibility of using precast pretensioned panels for roadway segments that are assembled on-site and post-tensioned.
The essential concepts for FHWAs precast prestressed concrete pavement system can summarized as follows:
•Precasting is performed utilizing the facilities already familiar to bridge engineers.
•Stockpiling of precast panels provides for rapid delivery as needed.
•Constructability and performance are facilitated by the design features of the precast panels.
I saw prefab roads constructed in Holland (Europe) in the sixties. All laid on sand and very quickly done.
This was an interesting video. Unfortunately, with the immature comments below people don't really get a good picture of the downfalls or advantages and chemistry behind this video's subject matter. Essentially we are still stepping in the wrong direction the scientific advances that they have made in this case are still a step forward but as one of the more mature members leaving comments had noted, it is not the step in the clean energy and holistic living style that we need. IT is great that we are trying to improve this system but there are still too many holes in the system. Wonderful engineering article. Thank you.
Exactly. Even if this super green material that everyone is interested in was to be implemented, it would need a sub-base material. But again 99% of the people here on this page are not civil engineers or professionals in this field at least.
They didn’t mention the use of huge foam panels that are used as a base for hiway construction. These panels allow the road surface to last longer than old style base.
@weenorwegian Yes , but they are older. Actually , In Bombay , India , all roads are concrete and they have ingenious methods to actually increase mileage , reduce potholes , and give a smoother ride :D
Wouldn't something like this make sense for city streets where the sections could be lifted out of the way for maintenance of utilities under the street?
City streest may have funny angles of turns, or sharp changes of altitude - precast panels would be hard to fit in such environment?
there is too much expansion and contraction here in PA to use a system like this it will buckle and pop and become very wavy between each section
What we need is for those sections to be retractable so when there is a protest they open than close up with a force of about 20 tons per sq. inch and they are smashed to pulp making a beautiful color of red behind.
they talk about being able to replace sections if needed... but how does that work when multiple slabs are joined together with steel cable in all the sections and then permanently fixed... you would have to cut trough all those cables, destroying the tensioning effect... ???
Metals? If you had taken a course in engineering you would laugh at your question. But nevertheless, metals oxidize in open weather, they are expen$ive and weight too much. Plus their isn't enough production on the planet to fulfil the interstate system for example & environmental footprint is massive.
Prestressed Concrete is fantastic. Concrete is prestressed for many reasons. One being to prevent it from cracking. Without cracks and weathering inbetween those cracks, it lives on much longer.
Using Solar Roadways as our paving choice could not only improve highway construction, these precast paving blocks could produce smart thoroughfares. With energy producing paving blocks, our roads could be safer, flexible and the smart roads of the future.
I see multiple problems with that idea of road material. First: I'm not sure how the road panels will perform as a load bearing member. They will have to go through various forms of compression and elongation due to heat and contraction due to cold temperatures. When you put the panels in line with each other, I'm not entirely sure how the system will react with these loads and stresses. Specifically on the use of solar panels as a load bearing member: A normal solar cell will not be able to withstand the amount of varying, but constant force applied to the specific section. So there is one of two ways to combat this: Completely redesign the solar cell. Which is costly and time consuming, and may not even be able to yield to the forces. Or create a thick and strong glass or glass-like material that will be able to transfer the loads to the ground instead of directly on the solar cell. The problem with this is that the thicker the material, the more bending of light there is. This will result in a lower efficiency percentage to an already low efficiency of the solar cells (13%-15% I believe). The other factor is any material that will be over the clear material such as oil and tread marks. If light is not able to pass through the substance, that panel will be essentially useless. The other problem is cost and maintenance. The initial cost of installation will be extremely high, and I am not sure that the output will overcome the initial cost. On top of that, I guarantee that maintenance on the cells will be regular and costly as well. It's a great idea, I just don't see it being beneficial in any way with the current standings of solar cells. Let me know if you can answer or rebuke any of my concerns.
Your concerns are valid. As with any innovation, Solar Roadway paving blocks have many unknowns, just as there are still unknowns with precast concrete. Solar Roadways has done a preliminary demonstration project of their paving system and the system seems to have performed exemplary so far. There is a very thorough FAQ on their website at; www.solarroadways.com/faq.shtml
But what has me excited is the flexibility and adaptability of Solar Roadway’s system. They can be applied not only to roads, but to parking lots, sidewalks and many other applications that uses pavement. I would be excited to see how precast concrete could be incorporated with solar paving. This could literally “drive” our transport systems into an integrated but flexible system, for the future.
Glen Bartholomew
Oh and you need more equpment ( cranes loaders rollers flat beds fork lifts etc)
So that's why we have those bumpy roads.
How do they get these pieces of concrete to these bridges though? That is one thing that i want to know.
What about storm water run off ?
Solar Roadways is the cool thing now days.
So your one of the Pr-reps for that company? How mush you getting? And no it's not.
I'm not getting anything. Feel free to look at my channel.
additional jointed precast pavement videos please visit Rapid Roadway. com or precast pavement at Twitter.
This is good, but let's take it to the next step--for example placing an electrical grid with built in sensors for the generation of self driving vehicles that will be set in place over the next 50 + years. The same sensors could also be used for traffic law enforcement and safety measures. Often 'hardwired' is more durable than satellite technology.
so how much coconut oil is actually used per square foot?
we won't be seeing those for a long time. at least till time time oil and coal is readily available.
Can concrete paving withstand -50*C weather? ..can it withstand repeated freezing and thawing?
There are still roads and some highways built in the 1930s- 1940s that are concrete. There are different grades for light, medium and heavy travel. They have lasted FAR LONGER than asphalt. The usual failure is that the substrate is not properly prepared.
If this system works the panels can be retro fitted in the shop for heat, lighting, markings and maybe even solar collection. A WIN-WIN.
Thanks for your help. Frogs in the ponds,
not a new idea, a local roadbuilder paved 2 roads here for free to prove his idea, those roads are still in good shape 40 years later.
to view additional jointed precast pavement videos please visit Renu Materials. com or precast pavement at Twitter.
Why does it need to be Prestressed?
@rprice33 In that case neither is any other new form of roadway pavement...especially one that won't pay for itself.
That will take way to long asphalt is way faster and plus asphalt you don't need to re do the hole thing u just need to redo sections this every 10 to 15 years you need to re do the hole thing
What is the wear like on tires. I know tar is a lot softer than tires.
+Oliver o nell Tire wear? really? you will get 3 more miles when you run on tar vs concrete.. thats all
SAUKEN 15 I'm not sure about that. Tar is softer than tire rubber where's concrete is harder. a thin layer of a softer material on top may be good.
Not enough to notice a difference in your car tires.. If you were running a NASCAR 200MPH I would agree!
SAUKEN 15 Have you tested it or are you just pulling numbers out of the air?
wow.. Asphalt to concrete, you will not notice a difference in tire wear.. PERIOD! Asphalt has the same mix design as concrete.. Sand, Stone and Cement, all same things that would wear tires down, the only difference is tar is used instead of water..
Well are brains are working. Susan great idea, just a little out side the box of reality. Glass thick enough to support 250,000 pounds would be very heavy. Now with that being said, what is glass? Transformed concrete, or sand. so how do we raise the levels and reduce the frequency of fixing because of millions of pounds of constant pounding multiplied be the movement of temps ( expansion and contraction ) then doubled by the natural movement of the ground. Wow, we have helter skelter on our roads. Now back in the days of Cesar when they had made their roads, which I might say are still standing today 2000 years later. They added volcano ash, which gets harder over time. I think we need to look in that direction if we are looking to a permanent solution, to a problem that I believe is more like the light bulb. I breaks so we can keep Joe in a job!!!! With out vision for creating and moving on to something new, we will box ourselves in and life will force us on to something new.
Remember there is always 2 ways to learn
Revelation, information shared by past experience.
Or
Tribulation, paying the price of the unlearned. Touching the paint so to say.
Revelation is always the better way I think
Interesting
RIP Kirsten Stahl
This is not a new idear. Germany build roads like this back in the second world war in Denmark. The problem is the dirt under shift and cracks the road. making the road a bumpy ride.
ليتهم يتعلمون عندنا
I'd rather see Solar Roadways take over construction of our roads.
Too much dust from concrete polluting the air for drivers, not to mention noise from tyers.
Why am i watching this?
@78kalpeshgmail you can see them building a parking lot in Colorado! time is now! go solar roadways!
Nope Asphalt is not faster. It needs to be redone every 5~7 years (not 15 years). Asphalt runoffs are poisonous. Consistent asphalt is hard to get. You need as much equipment for asphalt laying.
Prestressed panels are cheaper. Smoother and very consistent. They only need replacement every ~15-20 years. They maintain their performance/quality for longer durations.
The only problem is that there are not as many prestressed panel producers, since it requires specialized and technical knowledge.
Solar roadways aren't possible in a bankrupt country.
It would be a shame to use this over solar roadways. This would be one of the biggest blunders ever and all for what? To make some oil tycoons happy.
You are not answering my question. You look a guilty liar. Me speaking from my bottom? LOL.
When all commenters are civil engineering but cannot speak proper English
These roads are rubbish.
DUMB B.S. YOU HAVE TO FIRST POUR A BASE LAYER OF CONCRETE TO PUT THIS SHIT ON. YEAH THAT WILL SAVE TIME ALRIGHT. MONEY TOO.
+TRICK-OR TREAT The concrete base does not require the long cure time. Time is saved in getting the road in use. Money is saved by the roadway being built faster. Don't call something "BUMB B.S." when you have no clue what you are talking about. It makes you look stupid.
+acoow TALK ABOUT LOOKING STUPID ! "BUMB B.S. ? DUH ! REALLY ?
TRICK-OR TREAT
I apologize for assuming that you were acting stupid. Apparently, its not an act.
STILL FEELING THE BURN ARE WE ?
+TRICK-OR TREAT You must be Palestinian. They love to claim victory in defeat.
Too expensive and unpredictable. Concrete is proven to work and is cheap.
you will never be able to level it
garbage, never happen.
I'm no engineer, not anymore than you are - however, I am onboard, but not with this concrete idea - it's old news! In my opinion, the answer is in programmable, smart grid Solar Roadways made from hexagonal sections and covered in a formulated type of glass material that allow for a weight load of 250,000 lbs and rides out earthquake movements which replaces concrete entirely. The above idea is labor intensive, heavy, old thinking. Solar Roadways pay for themselves as they collect 3x the energy the U.S. currently uses, never needs snow plowing as it can be programmed to be heated; can be reprogrammed when needed; can be used in every application from sidewalks, to driveways, to highways. It will tell you when an obstruction is ahead of you.. the road itself is a smart grid!! If a panel is damaged, just that section need be lifted up and a new one installed. NO Concrete used at all. SOLAR ROADWAYS over concrete is the KEY.
And this concept is still but a pipe dream. The storage facilities to store the energy produced doesn't exist yet. The cost to provide just the wiring of said devices would be well above the cost that any city or state could afford. The down time to put something like this in place couldn't happen with the traffic that is now using the roads. Heated? Heat kills electronics, with a sealed panel there would be no way to cool the panel. The transfer of rubber compound from tires to the surface would degrade the panels ability to produce power and would constantly require cleaning (another added cost and down time of said road section). There is no base that could support this surface and keep it in constant level status to allow these panels to remain fitted to one another, once they developed a space between them they would lose contact with one another allowing foreign material to get under them and makeint the whole thing worse. Solar over concrete? Ok what happens when the concrete states to ware out and cracks? Again no base could function for this concept with the constent weight being applied to it (millions of cars a year). We don't have solar cells effective enough to be put into a sealed cell just yet. If you do any research you'l find at the "Solar Farms" they are replacing arrays all the time due to them wearing out. The sun not only provides the requirement to make solar energy from a cell but it also causes them to wear out also.
In short this is a pipe dream that someone came up with and put it on the net, others thought is was a great idea and jumped on the band wagon. It wouldn't be cost effective, it would (if they existed) cost way too much money to implement, we don't have the storage technology as of yet, the roads would be down too long and create too many traffic jams. And like I said it would cost more then most states or citys could afford to invest.
Mikey8567 But how many roads actually have the potential to produce revenue, rather than just us it up?
Glen Bartholomew It's a nice thought and I've seen some things on it, but right now I think they're best served in areas like driveways, and small parking lots. The infrastructure needed for them is enormous and would definitely crush any costs that would be recovered from them over the next few decades. And who would get all that solar energy? The government puts in the roads and pays for them, but then do they invoice us for the use of the power generated by them?
How much per mile?
So your one of the Pr-reps for that company? How mush you getting? 10+ million.
bugger off.