News on China's scientific and technological development.

RedMetalSeadramon

Junior Member
Registered Member
Carbon Fiber is weak in compression, strong in tension.
Concrete is strong in compression, weak in tension
Steel is good at both.

Fibers are already used in fiber enforce plastics, the most prominent use of this in major constructions are modern sewage and drainage systems where fiber reinforced polymer pipes are used.

I can see further development in carbon fiber to be used as a tensile reinforcement for reinforced concrete, but the strength, cost and reliability of steel offers strong competition.
When I was in school, a fishing rod length carbon fiber length was about 60$, my professor had one that he enthusiastically used as his pointer, the cost of steel rebar is about 0.95$ a foot.
 

sunnymaxi

Major
Registered Member
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China makes way for constructing AI application scenarios​


In a move to accelerate the application of artificial intelligence and foster a new growth point of national economy, China's Ministry of Science and Technology released a notification on Monday to support the construction of pilot AI application scenarios, with new technologies integrated and R&D cooperation strengthened between upstream and downstream.

The first batch of scenarios are related to smart application in farming, port, mining, factory, home electronics, education, autonomous driving, medical service, court and supply chain.

In autonomous driving, for example, the notification clarified pushing forward the application of core technologies in cooperative vehicle infrastructure system (CVIS), enhancing unmanned driving trial tests under complex driving conditions, and promoting the development of unmanned logistics, smart buses and autonomous valet parking.

A report by Sealand Securities said the automobile sensor is the basis of an autonomous driving intelligent system, such as a car camera, laser radar and ultrasonic radar. As the government released a variety of polices in the auto sector, China's autonomous driving is expected to step up to a new level, and the automobile sensor industry will benefit from it.

Backed by the national new generation AI innovation and development pilot zone, China will give full play to the enterprises from the open innovation platform, and continuously support the construction of AI-related scenarios, according to the Ministry of Science and Technology.
 

latenlazy

Brigadier
Carbon Fiber is weak in compression, strong in tension.
Concrete is strong in compression, weak in tension
Steel is good at both.

Fibers are already used in fiber enforce plastics, the most prominent use of this in major constructions are modern sewage and drainage systems where fiber reinforced polymer pipes are used.

I can see further development in carbon fiber to be used as a tensile reinforcement for reinforced concrete, but the strength, cost and reliability of steel offers strong competition.
I think CF is not a good bulk material, unlike steel. It would be difficult to deploy as a large scale construction material, and frankly speaking it’s not necessary because there’s really no need for stronger building materials than current technologies for most construction applications. So we’re probably going to see it more in manufacturing rather than construction. CF composites help resolve the compression issues for CF by creating a bed matrix that absorbs the compression forces. These large tow CF materials will most likely enable or make easier and cheaper the manufacturing of much larger CF parts.
 

broadsword

Brigadier
Does carbon fiber age as well as steel? Will it become brittle after thirty years? If it costs only three to five times the price of steel, maybe it is worthwhile only for the top twenty floors of a 250-story building.
 

latenlazy

Brigadier
Does carbon fiber age as well as steel? Will it become brittle after thirty years? If it costs only three to five times the price of steel, maybe it is worthwhile only for the top twenty floors of a 250-story building.
Why do you need carbon fiber for construction? You can already build 250 story buildings with concrete and steel, and China is unlikely to ever build that tall a building anyways with the new construction regulations in place.
 

RedMetalSeadramon

Junior Member
Registered Member
Does carbon fiber age as well as steel? Will it become brittle after thirty years? If it costs only three to five times the price of steel, maybe it is worthwhile only for the top twenty floors of a 250-story building.

Not so sure as carbon fiber is somewhat new for construction. In general polymer don't like UV and Carbon Fiber reinforced Polymers is no exception, hence why they're currently used for buried sewage systems. if you are thinking about weight savings the majority of weight in a building will be the concrete, and switching out steel for CF will result in a minimal amount of weight savings.
I think CF is not a good bulk material, unlike steel. It would be difficult to deploy as a large scale construction material, and frankly speaking it’s not necessary because there’s really no need for stronger building materials than current technologies for most construction applications. So we’re probably going to see it more in manufacturing rather than construction. CF composites help resolve the compression issues for CF by creating a bed matrix that absorbs the compression forces. These large tow CF materials will most likely enable or make easier and cheaper the manufacturing of much larger CF parts.

I think this is correct, CF will mostly be used manufacturing such as aircraft and light ships rather than for construction.
 

broadsword

Brigadier
Why do you need carbon fiber for construction? You can already build 250 story buildings with concrete and steel, and China is unlikely to ever build that tall a building anyways with the new construction regulations in place.

Isn't cf being discussed as a construction material? Hence I gave a hypothetical case of its application.
 
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