@53:28 Question was: "Is UHPC generally heavier than conventional concrete?" WJE materials engineer Elizabeth Nadelman gave a very enlightened answer beginning with an authoritative declaration that "the typical density of conventional concrete is 145-150 lbs per cubic YARD". I know she definitely knows what she is talking about because she then followed that up by smartly stating, "UHPC is a little bit heavier than that because of the steel fibers found in UHPC and therefore typically weighs anywhere from 155-160 lbs. per cubic YARD." WJE should be delighted to hear that Boeing Aerospace is currently in the project funding phase for development of a basalt fiber reinforced all UHPC flying luxury cruise ship that is expected (based on Ms. Nadelman's expert findings) to typically weigh less than a cubic bundle of Howard Hughes balsawood sticks.
I'm working with UHPC since 1985 (Densit a/s, a company of Aalborg Portland Denmark where Hans Henrik Bache invented the first UHPC in 1978 and used for the repair of the stilling basin in the Kinzua dam in the USA) in different areas and while I do like your presentation I have some question marks. For example a packing model was used by Bache in the 1960's. Further an UHPC is not always reinforced with fibers, not always contains only fine aggregates and not always a free flowing self compacting concrete. UHPC has been, since 1985, designed for performance in many business area's like Security Industry (bank vaults, safes, ATM's, etc. and military shelters, etc.), Wear Protection in systems to transport abrasive materials, Civil Engineering and Offshore.
Happy to see that my 1999/2000's R&D on UHPC applications led to two choices (u girder & box slabs), that are considered as being advances 20 years later ;-)
Great video. Thanks for your the information. I'm more concern about the shrinking effect if compared to conventional concrete. Could you please elaborate more on this issue?
Using for years here in France for thin bridges artistic building walls and especially in exterior furniture designs This is a huge breakthrough for steel-less designed projects
At 5 minutes 46 seconds, it's shown that water-cement ratio is less than 0.20. What about adequate cement hydration?....Hydration needs roughly a water-cement ratio of 0.23.
Извините,что вмешиваюсь, но 0,20-0,15 это нормально для гидратации. У меня на сам цемент приходится 0,15%+(1/3 воды на микрокремнезем, а его кладу 10%от цемента) , и получаю SCC. +160-180кг микро фибра стальная.
Silica flour is crystalline since it is made by finely grinding silica sand. Silica fume is amorphous (non-crystalline) and its particles are spherical. Silica fume has extremely small (1 micrometer) while silica flour particles are larger (4 to 16 micrometer). Size differences are used in particle-packing principle.
When considering the weight difference between UHPC (155-160 pcf) and NC (145-150 pcf) you need to consider that UHPC has some of the reinforcement in it already even if the application is only shrinkage. That consideration of reinforcement amount and weight would increase the pcf weight of NC by at least a little. The fact that UHPC is about 3-4x the compressive strength of NC also might bring in add'l weight for the NC when reinforcement is used on it for increased compressive strength.
Здравствуйте! Испытайте пожалуйста на прочность при попадании в плиту из uhpc бетона авиационной против бункерной бомбы (gbu 28), какая толщина Вашего бетона не пропустит её насквозь???!!??? Обязательно чтобы бетон был армирован микро стальной фиброй. Благодарю. Я тоже делаю подобный бетон, но работаю один. У Вас возможностей побольше!) А вопрос сейчас актуален как никогда. Если результат будет, то этот бетон у Вас купят для укрытия богатые люди. Мира всем и добра!
52 Lbs of superplasticizer pcy seems highly excessive. Most documentation I find suggests 1% superplasticizer at most of concrete weight, The UHPC mix in this video has superplasticizer around 4.5% the weight of the cement.
Действительно, 2,5% достаточно для водоцементное соотношение менее 0,20. Но для сообщения менее 0,15 надо уже 3-4%пластификатора. У меня получалось делать scc и при соотношении 0,11, но уже пластификатора 6%
The lack of information about the Carbon Dioxide emissions of this UHPC concrete is worrying, and throws any benefits out the window if we cannot decrease these emissions. As this is the current need for infrastructure at the moment.
Carbon dioxide issues come from the production of the portland cement from the decomposition of limestone (calcium carbonate). Concrete does not emit carbon dioxide; rather, it actually absorbs carbon dioxide when calcium oxide, a hydration by-product, combines with carbon dioxide to produce calcium carbonate, the efflorescence that is often seen on the surface of concrete.
@53:28 Question was: "Is UHPC generally heavier than conventional concrete?" WJE materials engineer Elizabeth Nadelman gave a very enlightened answer beginning with an authoritative declaration that "the typical density of conventional concrete is 145-150 lbs per cubic YARD". I know she definitely knows what she is talking about because she then followed that up by smartly stating, "UHPC is a little bit heavier than that because of the steel fibers found in UHPC and therefore typically weighs anywhere from 155-160 lbs. per cubic YARD." WJE should be delighted to hear that Boeing Aerospace is currently in the project funding phase for development of a basalt fiber reinforced all UHPC flying luxury cruise ship that is expected (based on Ms. Nadelman's expert findings) to typically weigh less than a cubic bundle of Howard Hughes balsawood sticks.
I'm working with UHPC since 1985 (Densit a/s, a company of Aalborg Portland Denmark where Hans Henrik Bache invented the first UHPC in 1978 and used for the repair of the stilling basin in the Kinzua dam in the USA) in different areas and while I do like your presentation I have some question marks. For example a packing model was used by Bache in the 1960's. Further an UHPC is not always reinforced with fibers, not always contains only fine aggregates and not always a free flowing self compacting concrete. UHPC has been, since 1985, designed for performance in many business area's like Security Industry (bank vaults, safes, ATM's, etc. and military shelters, etc.), Wear Protection in systems to transport abrasive materials, Civil Engineering and Offshore.
Bache is regarded the father of UHPC, but Cherazy 1994 development ideas of Bache for commercial usage
I need your experience and advice to help me about UHPC concrete, sand grain size in UHPC, thank you very much
I need your experience and advice to help me about UHPC concrete, sand grain size in UHPC, thank you very much
Happy to see that my 1999/2000's R&D on UHPC applications led to two choices (u girder & box slabs), that are considered as being advances 20 years later ;-)
lost+found I’m interested in making a concrete lathe and stumbled on UHPC.
ua-cam.com/video/oZWcGHnjtLg/v-deo.html
I need your experience and advice to help me about UHPC concrete, sand grain size in UHPC, thank you very much
I need your experience and advice to help me about UHPC concrete, sand grain size in UHPC, thank you very much
Very interesting. I am looking for using this technology in Bangladesh. Thanks for nice presentation.
MuCEM is in Marseille! Thanks for the video
Great video. Thanks for your the information. I'm more concern about the shrinking effect if compared to conventional concrete. Could you please elaborate more on this issue?
It shrinks and cracks
Using for years here in France for thin bridges artistic building walls and especially in exterior furniture designs
This is a huge breakthrough for steel-less designed projects
Very informative and useful information. Nice presentation. thanks for sharing.
Beautiful presentation. Learnt a lot.
Very Informative video
Well done
At 5 minutes 46 seconds, it's shown that water-cement ratio is less than 0.20. What about adequate cement hydration?....Hydration needs roughly a water-cement ratio of 0.23.
Извините,что вмешиваюсь, но 0,20-0,15 это нормально для гидратации. У меня на сам цемент приходится 0,15%+(1/3 воды на микрокремнезем, а его кладу 10%от цемента) , и получаю SCC. +160-180кг микро фибра стальная.
Could you please provide me this ptt slide?
What would be the main difference between silica flour and silica fume?
Silica flour is crystalline since it is made by finely grinding silica sand. Silica fume is amorphous (non-crystalline) and its particles are spherical. Silica fume has extremely small (1 micrometer) while silica flour particles are larger (4 to 16 micrometer). Size differences are used in particle-packing principle.
When considering the weight difference between UHPC (155-160 pcf) and NC (145-150 pcf) you need to consider that UHPC has some of the reinforcement in it already even if the application is only shrinkage. That consideration of reinforcement amount and weight would increase the pcf weight of NC by at least a little. The fact that UHPC is about 3-4x the compressive strength of NC also might bring in add'l weight for the NC when reinforcement is used on it for increased compressive strength.
I need your experience and advice to help me about UHPC concrete, sand grain size in UHPC, thank you very much
I need your experience and advice to help me about UHPC concrete, sand grain size in UHPC, thank you very much
I need your experience and advice to help me about UHPC concrete, sand grain size in UHPC, thank you very much
I need your experience and advice to help me about UHPC concrete, sand grain size in UHPC, thank you very much
Здравствуйте!
Испытайте пожалуйста на прочность при попадании в плиту из uhpc бетона авиационной против бункерной бомбы (gbu 28), какая толщина Вашего бетона не пропустит её насквозь???!!??? Обязательно чтобы бетон был армирован микро стальной фиброй. Благодарю. Я тоже делаю подобный бетон, но работаю один. У Вас возможностей побольше!) А вопрос сейчас актуален как никогда. Если результат будет, то этот бетон у Вас купят для укрытия богатые люди. Мира всем и добра!
52 Lbs of superplasticizer pcy seems highly excessive.
Most documentation I find suggests 1% superplasticizer at most of concrete weight, The UHPC mix in this video has superplasticizer around 4.5% the weight of the cement.
Действительно, 2,5% достаточно для водоцементное соотношение менее 0,20. Но для сообщения менее 0,15 надо уже 3-4%пластификатора. У меня получалось делать scc и при соотношении 0,11, но уже пластификатора 6%
how is your product better/different from this U MICH PRODUCT?
ua-cam.com/video/EfCaId0LzlE/v-deo.html
Привет! Очень интересно какую толщину uhpc пробьёт или наоборот не пробьёт (gbu 28) против бункерная авиационная бомба???!!??
what about the size of Fine Sand in UHPC
Sand sized
how do you fill pinholes and broken edges in uhpc
Obviously epoxy based repair. Come on lol
epoxy resin?? but uhpc is kind of concrete..broken edges could not be repaired by cement alone ??
How can i reduce shrinkage ?
Just don't let it shrink duh
Thank you Dr.
hi
Today is my presentation on UHPFRC topic.
I am selected this topic for Mtech Project ....
Sir, pls share the ppt of this topic . It helps me more in my project ☺️😭
Thank you so much
السلام عليكم ورحمة الله الاخ العزيز ممكن مساعدتي ماهي مقايس الخلطة ونوع الملدن بارك الله فيك
thank u very much
The lack of information about the Carbon Dioxide emissions of this UHPC concrete is worrying, and throws any benefits out the window if we cannot decrease these emissions. As this is the current need for infrastructure at the moment.
😂
No one gives af about emissions, we just want better concrete
Carbon dioxide issues come from the production of the portland cement from the decomposition of limestone (calcium carbonate). Concrete does not emit carbon dioxide; rather, it actually absorbs carbon dioxide when calcium oxide, a hydration by-product, combines with carbon dioxide to produce calcium carbonate, the efflorescence that is often seen on the surface of concrete.