Good point! Are fiberglass stirrups available?

​@@ChristianWagner888In Germany WE already had some projects with Fiber Glass stirrups, but Not many. So it isn't really mainstream Up to now.

​​@@ChristianWagner888 He could have used steel stirrups in the both the fibre glass and steel-reinforced samples, to test the difference in bending strength due to the material used for reinforcement.

Do you know of a better demo / explanation of the pros and cons of rebar?

Wouldn’t this test be a good indicator for use in driveways?

BS. Fiber rebars decompose in concrete due to alkaline

@@juanmatus5708 alkaline didnt decompose my gfrp.

@@juanmatus5708 - That's not accurate. Most FRP rebar has a coating to resist high-pH (anyone spec'ing FRP would assure this) and the lifetime of FRP rebar with pH-degradation would be similar to steel in a best-case environment, while obviously much more resilient in a corrosive environment.

@@InspiredScience You basically just let me know to not cut the FRP rebar, being that most people do because of size of project.

@@williamnunez9609 - Thank you. As with all reinforcing bar, ideally you want to have it shipped and use it in the maximum possible length for economy. Every time you have a cut/seam, it requires substantial overlap, plus the small bit of labor which adds-up as well. When it was suggested that FRP corrodes, that is not an issue to be concerned with, regarding cutting. The simplest way to think about it is to check what environment you're using the rebar in, then confirm the resins used and whether there is any issue. I don't know of any reputable FRP rebar resellers who are selling FRP rebar where there would be an issue; however, it cannot hurt to double-check. BTW - I spec a lot of coastal work in Florida; you wouldn't happen to work there, would you?

Ahí sin duda las varillas de fibra de vidrio arrasan frente a la varilla de acero. Obviously the GFRP doesn't suffer corrosion, so the result could be even better for the GFRP concrete against de steel reinforced one.

​@@enekojobajuria3397😅😅😊😊😅

Home depot sells it now. I'd stick with steel.

Can concrete with fiber glass potentially be hazardous for your health? When inhaling the dust?

@@lem8304 Cement by itself is already harmful to your health when inhaling the dust. Adding the fiberglass won't really make it much worse.

The concrete by itself can produce silicosis in the long term, adding chopped glass fiber is thge same, but in a gfrp the glass fiber goes incapsulated by a polymer. El propio hormigón contiene arena de sílice y el polvo que produce puede generar silicosis a largo plazo, añadir fibra de vidrio cortada no lo empeora mucho más, ahora bien, con las varillas corrugadas de fibra de vidrio no hay ese problema ya que van encapsuladas en un polímero, eso sí, al cortarlas desprenden polvo tóxico por inhalación.

The chopped AR fiber glass in concrete is mainly used for flooring. El hormigón reforzado con fibra de vidrio cortada del tipo Álcali Resistente se usa mayoritariamente para soleras, no para forjados, vigas o pilares, los cuales suelen ir armados.

Coated rebar bad

Horse hair and lime in plaster or something like that

Pretty sure hair and other fiber is for resisting cracking when portland cement is not involved

How does pinkbar compare to steel? Pouring a slab in 2 days

Yeah... and here I'm sitting in a house built in 1956 using A0 steel rebars - unless they had insufficient concrete cover all those bars suffered very little corrosion and surface only. It's very different in things like bridges or foundations - where there's plenty of water during the lifetime. And yet there are bridges made by nazis (up to 1945) with little to no degradation of rebars. And same goes to bunkers etc. As with everything - it depends. It depends how fast pH of concrete will drop below ~10.8, it depends how often water would penetrate concrete, it depends how much chlorium will sink into a concrete etc. etc.

Depends on the quality of rebar

Like why the heck would you perform a test that is no representative of real life construction methods

I live in the Dominican Republic. Retired American. No experience in construction. I live about 2 mi from the Caribbean. Presumably there is some salt content in the air here. I see a lot of failed concrete around with rusted swelled rebar literally blowing the concrete apart. I am fascinated with the idea of replacing iron rebar with fiber reinforcing in some applications. The best roofs around are flat poured concrete with rebar. This can also be the flloor of a second story, etc. A lot of labor goes into building the plywood forms and supporting the forms with beams and a forest of posts underneath. I have a yearning to build a very different kind of roof. I imagine a roof poured in strips in the form of a downward-arching catenary shape. I understand that a catenary puts the shape under pure tension. There would need to be some kind of sling (a sort of hammock) to support the cement while setting. When set, the catenary shape would be flipped over (arch upwards) which should put the material under pure compression. I'm imagining eliminating the iron and just using fiber. Multiple abutting strips would form the roof. No good for second floor, but a pleasant arched ceiling indoors. Does anything make sense here? Does anyone want to talk about this? Peter. prx555 at gmail

Interesting point

@@mythocrat 근데 재료값이 올라감 ㅋㅋ

exactly, GFRP has low midulus of elasticity hence it requires more surface area

About 350

My guess is that steel rebar is better anchored in the concrete than the fiberglass, since no rebar was broken. Ofcourse, since no stirrups were used, the ultimate limit state was achieved by shear force, not the moment, and therefore rebar didnt reach the maximum tensile force. Still, a good test for youtube :)

Are you smoking man? Did you seriously say that and mean it? You're telling me something that is less than half the weight of the steel is only marginally weaker because the weight wasn't taken into account in the amount of material used. If he used the number of bars of fiber glass that would weigh the same as the steel it wouldn't budge.

I agree with you 100%. That looked like they used 3 inch crushed stone. Should have used no bigger than 3/4 inch. 33% sand, 33% 3/4 inch crushed stone and either a 60-80 lbs bag of cement. And properly mixed, felt like it wasn't even mixed right either.

I really hope you're right about that because thousands of concrete buildings have people who work or live in it. Also concrete houses are cheaper in my country and I am interested to buy one but I read some very alarming things about concrete that I hesitate a lot.

Yet America waits on Chinese steel. I remember when America had a backbone of industrial might, sadly its cheaper to pay someone overseas rather than paying a fallow countryman a living wage. Its not about being fair it's about the freedom to do business Reagan reckoned, how's that going? Dont hate educate.