60000 psi Nanopowder Concrete / Regular Concrete was 5000 psi

200 to 800 MPa Concrete Paper II - Ultra Strong Concrete

Lu and Young [3] achieved 800 MPa strengths on
compressed samples, and Richard and Cheyrezy [4]
developed Reactive Power Concretes (RPCs) ranging from
200 to 800 MPa and fracture energies up to 40 kJ m....


http://www.theconcreteportal.com/reac_pow.html


transformed in to an pdf.

 

800 MPa Concrete Paper III - Ultra Strong Concrete

Lu and Young [3] achieved 800 MPa strengths on
compressed samples, and Richard and Cheyrezy [4]
developed Reactive Power Concretes (RPCs) ranging from
200 to 800 MPa and fracture energies up to 40 kJ m....

MRS Proceedings
MRS Proceedings / Volume 245 / 1991Copyright © Materials Research Society 1992 DOI: http://dx.doi.org/10.1557/PROC-245-321 (About DOI)
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Table of Contents - Volume 245 - Symposium K – Advanced Cementitious Systems: Mechanisms and Properties Editors : F.P. Glasser, P.L. Pratt, T.O. Mason, J.F. Young, G.J. McCarthy
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Articles
Hot Pressed DSP Cement Paste
1991 MRS Fall Meeting.
Ping Lu and J. Francis Young
a1 Center for Cement Composite Materials University of Illinois at Urbana-Champaign Urbana IL 61801, U. S. A.
ABSTRACT
DSP cement paste is prepared by hot-pressing technique in this study in order to improve its particle packing and chemical composition, and to investigate the relationship between its solid phase microstructure and mechanical strength at the porosity close to zero. The addition of silica fume improves strength development, although capillary porosities are not changed significantly. Results obtained indicate that the highest compressive strength reached are 800 MPa after 28 days hydration and oven drying at 200°C. The strength has better relation with degree of hydration or the physical density of C-S-H. the silicate anion polymerization closes not appear to influence strength.
Correspondence:
p1 Department of Materials Science and Engineering, Tongji University, Shanghai 200092, China.​

 

Ultra Strong Reactive Powder Concrete 800 MPa Recipe

REACTIVE POWDER CONCRETE COMPOSITION & MANUFACTURING:

Reactive powder concrete application
Reactive powder concrete has been developed to have a strength of 200 to 800 Mpa with required ductility. It is new technique involved in the civil engineering .Reactive powder concrete in made by replacing the conventional sand and aggregate by grounded quartz less than300 micron size, silica fume, synthesized precipitated silica ,steel fibers about 1 cm in length and 180 micron in diameter .

RPC is composed of very fine powders (cement, sand, quartz powder, and silica fume), steel fibers (optional) and a super plasticizer. The super plasticizer, used at its optimal dosage, decreases the water binder ratio (w\b) while improving the workability of concrete. A very dense matrix is achieved by optimizing the granular packing of the dry fine powders. This compactness gives RPC ultra –high strength and durability .Reactive powder concretes have compressive strength ranging from 200 Mpa to 800Mpa.



Typical composition of reactive powder concrete 800 Mpa
1.
Portland cement – type V
1000 kg/m3
2.
Fine sand ( 150 – 400 micron)
5001 kg/m3
3.
Silica fume (18 m2/gm)
390 kg/m3
4.
Precipitated silica (35 m2/gm)
230 kg/m3
5.
Super plasticizer (polyacrylate)
18 kg/m3
6.
Steel fibers (length 3mm and dia.180µ)
630 kg/m3
7.
Total water
180 kg/m3
8.
Compressive strength (cylinder)
490 – 680 Mpa
9.
Flexural strength
45 – 102 Mpa
Manufacture of Reactive Powder Concrete:

Some of the general principles for developing RPC are given below":

1. Elimination of coarse aggregates for enhancement of homogeneity.

2. Utilization of the pozzolanic properties of silica fume.

3. Optimization of the granular mixture for the enhancement of compacted density.

4. Optimal usage of super plasticizer to reduce w/b and improve work ability.

5. Application of pressure (before and during setting) to improve compaction.

6. Post-set heat-treatment for the enhancement of the microstructure.

7. Addition to small-sized steel fibres to improve ductility.

 

Lu and Young [3] achieved 800 MPa strengths on
compressed samples, and Richard and Cheyrezy [4]
developed Reactive Power Concretes (RPCs) ranging from
200 to 800 MPa and fracture energies up to 40 kJ m....

Composition of reactive powder concretes
Authors: Richard, P.; Cheyrezy, M.
Source: Cement and Concrete Research, Volume 25, Number 7, October 1995, pp. 1501-1511(11)
Publisher: Elsevier

 

TANSL

Normally = Not Necessarily

Well it does normally although not necessarily.

Poida

 

Mustafa, I don't think anyone here knows anything about these super concretes, so no one will be able to tell you how much thinner you can make a ferrocement skin.

For what you want, which I believe is a 3 meter boat of some sort, I can't see where it might even be advantageous to use ferrocement.

 

Bomb Proof Iranian Concrete? Oh no. LOL

I remember when just before Gulf I all sorts of experts were on TV news all in a panic about the POSSIBILITY Saddam had a bunch of SUPER-BOMBS aka Thermometric. https://en.wikipedia.org/wiki/Thermobaric_weapon#/media/File:A-1E_1SOS_PavePat_1968.jpg

Well, we certainly had them in Viet Nam and still lost to a bunch of 3rd world farmers, so I didn't see how they could be that much of a threat.

What about these? Will they sweep across the Western world like Genghis Khan's horde? http://www.theregister.co.uk/2010/10/04/northrop_mld_and_bavar/

Defense CONtractors Grumman and Northrop says only a RAY-GUN can stop them!


Fortunately, our Japanese (now) allies have already developed a counter measure able to penetrate even Iranian-Super-Concrete. http://wrongsideoftheart.com/wp-content/gallery/posters-a/atragon_poster_03.jpg

 

Here's a reference to other ultra concretes: http://www.ipublishing.co.in/ijcserarticles/twelve/articles/voltwo/EIJCSE3083.pdf

For boat building such mixes have added attractions of possibly better resistance to salt and ability to achieve better finishes. I say "possibly" because the skills needed would be not "unskilled" labor traditionally spoken of with FC. As with anything, it takes real skill or care to do something well.

 

This is a complex question because there are lot of other considerations for a structure beside just compressible strength and thickness.

If your design is only in compression, than there would be a direct reduction in cross section based on strength, not considering if there was any change in safety factor (which sometimes happens based on usage, materials properties, reliability of construction method, redundancy, etc.).

On most structures, particularly boat hulls, you not only have compression loads, but also shear, tension, torsion and even combination loads that may require larger safety factors.

So thickness depends on more than just the compression strength. Typically the tension reinforcement (usually steel) is the limiting factor, if that is the case with this supper concrete, it would not get much thinner at all. If this materiel has very high tensile strength, it might allow you to reduce the steel and the thickness (conventional concrete has almost no tensile strength, that is why reinforcement is necessary).

so because the material is ten times stronger, it does not mean you can use a wall thickness one tenth and get the same strength.

 

It looks like the wire reinforcing they were using in the really tough mixes was nitinol memory metal wire. Kind of pricey as a bulk reinforcement. If only used to provide a bit of compression as an aid to void reduction, not too bad. But if you wanted to use a quantity sufficient to properly post tension the finished mortar (activated by the heat treatment process) then things get pretty silly. A mix with 15% of very well prepared wire bits might get to 80mpa tension in the metal. But this stuff would cost about $15000 per yard in materials, and would need quite a bit of savvy to convert into real products. So a different method of gaining some pre- or post- tension in the reinforcement would be highly desirable. Anybody got carbon fiber shrink wrap?

It seems more appropriate for parts, rather than hulls. A precast keel and frame kit might make a nice start. Not exactly easy for others to copy the technology even if they splash the shapes.

Not the sort of stuff you want to trim or fiddle into shape after it has set, though.

And for crying out load, don't drop any mud on the floor!

 

philSweet,

I want to drink what you are drinking. Trying to offer a knowledge about concrete boats where cost per yard 15000 dollars , I think you hate poor people.

Steel wires or steel fibers are abound and there is an exact seller per country costs 1 package 20 dollars or so. And there are kilograms of extremelly strong steel wires.

I gave lots of papers links , if someone is serious , invest 20 dollar per paper and learn the list whatever you need to make these concretes.

If you have no money , visit your concrete mixing factory and get their best recipes and steel fibers and go from there.

 

Concrete by itself doesn't have much of anything going for it. Alone, it's weak, heavy, expensive and bulky.

Concrete's value comes from what you can embed in it, what it can hold, the forms you can place it in and what you can add to it. Saying that it's "strong", (whatever that means) is like saying that flour tastes good. Neither is true, but each has utility in recipes that make it invaluable. And the end product of those recipes can taste very good and be very strong. But only a tiny part of that is due to the flour or the concrete.

Concrete from Home Depot, properly mixed and placed and then pre-stressed will make this latest, magic concrete look like wet cardboard. Because it's not about the concrete.

The big rage twenty years ago was adding ash to concrete. That increased it's strength (which is meaningless, just like this is) and made modern concrete as advanced as what the Romans used. They were the first to use ash. But they didn't have modern re-bar or modern batch processing.

It always pleases me when technology catches up with the Romans.

 

Jammer Six,

I dont know where did you hear concrete is expensive but here , french made 54 grade concrete is 1 dollar per 50 kilograms or 110 pounds.

Your ash story is wrong , americans went to italy and got concrete samples and found ash in it and cast it for lighthouses where sea is violent and there is only 1 hour to harden againts to giant waves. They succeeded 100 years ago not 20 years ago .

Steel fibers are extremelly cheap also.

If someone buillt a flexible , two plywood molds , they can cast that super strong concretes very thin with the help of vibration source to fill the mold completely.

No need to wire mash , dirt , hand filling the mesh.

I sent worlds smallest sailboat pictures, anyone is intelligent enough can cast that boat part by part and adhesive the parts one on other with epoxy , or epoxy pool.

I think that boat can carry immigrants from a to b in summer for mid distances.

Any one can build these parts in balcony or small room.

Umut
Istanbul

 

I said it was "the big rage" twenty years ago, not that it was invented twenty years ago.

Pointing out that Romans used ash in their concrete would seem to indicate that to most readers. They used ash in concrete two thousand years ago.

Cement is cheap. Aggregate is cheap. Water can be cheap. Wood is cheap. Labor is cheap. Steel is cheap.

Combining them into a useful concrete structure creates an expensive structure.

No less than Thomas Edison believed the same thing you do. He tried to create mass-produced, cheap concrete houses.

He failed because the act of assembling all these cheap components correctly is not cheap.

Dentists do the same thing with the (cheap) material used to fill your teeth.

 

If you want to assemble a concrete 50 inches long ocean going immigrant adventure or say travel boat in your house out of double sided plywood concrete parts mold , it is the cheapest and healthiest.

Think, if you have a small house in the big city , no garden , no park , no balcony , can you build a boat from polyester fiberglass. If you wet the glass fiber with polyester , half of hour later , police comes to door because all the apartment stinks.

You need to make plywood molds and fill it with concrete and steel fiber , ash or with other fancy stuff. No stinking , cheap and if you build from 6mm thick hull thickness , only % 35 more heavier if your polyester hull is 12mm thick.

And if you add ash , setting time is 1 hours. You can build all your parts in a day or week without irritating anyone.

Than you can invest a few liters water based epoxy and glass fibers to stitch the parts together , like plywood hull.

Making plywood hull costs enourmous money , noise , transpport fees etc and out of question.

For vibrating mold , a speaker or plasticizer acrylic are the options.