UHPC Navy Concrete - Ferrocement

The technique of using fine wire mesh as a 
reinforcement for concrete (ferroconcrete) 
structures is already very old. This 
technique has been used above all in the 
manufacture of boat and ship hulls, simple 
construction elements and in the design 
sector.

Today, less so-called chicken wire mesh is 
used and more plastic and ceramic mesh is 
used, which exceeds the tensile strengths 
of steel several times over.

With UHPC (Ultra High Performance 
Concrete) Navy binder it is also possible to 
use very fine aggregates, which in turn make 
it possible to use very fine meshes. Modern 
high quality UHPC Navy materials are a 
multiple times superior to standard concrete 
in all technical values.


UHPC has been used in the offshore industry 
for more than 25 years as a construction 
material and as a corrosion protection material 
under the harshest environmental conditions. 
In many areas, UHPC is superior to steel and 
replaces it there.

UHPC Navy offers the professional navy 
architect, boatbuilder and shipyard a more 
than interesting alternative to steel, plastic 
and wooden constructions.
Production methods such as casting and 
spraying and the rapid development of 
strength can save enormous costs.


This new development also makes it possible 
to manufacture boats or ships in series. 
Special hulls are possible. UHPC designs for 
floating windmill systems are in production today.

 

Statement on Ferrocement	Statement on UHPC Navy
Ferrocement = Steel reinforcement plus   mortar concrete   Small dia high tensil steel rods sandwiched   between layers of wire mesh (chicken mesh)	UHPC Navy = Steel, cermic fiber or plastic fiber   reinforcement plus   Ultra High Performance Concrete   Extreme high tensil strength ceramic or glasfibre   mesh and ceramic rods
The shell structure of mortar and steel would   be sufficiently impermeable, strong and   impact resistant and with the right degree of   flexibility	The shell structure of UHPC Navy and   reinforcement would be high sufficiently   impermeable, extreme strong, very high impact   resistant and with a extreme high flexibility.
Ferrocement boats are produced in Britain,   Canada, South Africa, Hong Kong and USA	Hong Kong, Singapore, United Arabs Emirates
Ferrocement hulls do not rot, nor do such   marine animals as bores and tered worm   have any effect on the mortar	UHPC Navy hulls are absolutly sea water resistant,   absolutly restinstant against marine animals high   dense structure and extreme high corrosions   resistant
Ferrocement hulls are stronger than hull    build in wood or glassfibre	UHPC Navy hulls are much stronger than hulls in   wood or glassfibre
A partical characteristic of ferrocement,   unlike others, is that if gains strength with   age rather than loose it.	UHPC Navy already reaches more than 70% of final   strength after 48 hours and gain strength with age.
Ferrocement   Tensil strength 37 MPa   Compressive Strength 83 MPa	UHPC Navy   Tensil strength 52 MPa+ or 755 psi (depends on   reinforcement system)   Compressive strength 140 MPa+ or 2300 psi   (depends on reinforcement)
Ferrocement is high temperature resistant	UHPC Navy is very high temperature resistant. In a   special high temperature resistant version UHPC   Navy it temperature resistant up to 1200°C or   2192°F
Ferrocement has a very low thermal  conductivity	UHPC Navy has a low thermal conductivity in   combination. With special insulation aggregates   UHPC will have a extreme low thermal conductivity
Absence of maintenance cost for the hull	UHPC Navy hulls are maintenace free
A problem would be the difficulty of   achieving complete penetration of mortar   through the mesh matrix	UHPC Navy mortar, spray and castable products are   selfcompacting. The penedration through the mesh is   nearly to 100%
Portland cement, Slag cement	UHPC Navy Binder
Water/cement ratio 0,35	Water/ cement below 0,25
Aggregate: Sand which pass 3/16 in sive	Aggregate: 0 – 3 mm Quarzsand or insulation   material in the same grain size or desert sand
Mixing ratio cement : aggregates 1:2	Mixing ration UHPC Navy binder : aggregates 1:1
Density 2400	Density 2400
Admixtures: for improve workability,   durability, acclerate or retard setting and   hardening   Such admixtures are only introduced in   minute qualities to produce the desired   effect, therefor the degree of control must be   very high.	Admixtures are not necessary for UHPC Navy
Recommended mixer is that which has a   paddle attached to the inside of the drum to   keep the mortar mixing evenly.   The mixer is often referred to as a plaster´s   mixer	Pan pot mixer or shaft mixer
Min. boat size approx. 18 ft	Not known
Hull skin thickness 3/4 in	Hull skin thickness max. 3/4 in
Salary rates for mortar work very high	Labor costs much lower, installation as shotcrete,    casting and mortar possible. UHPC Navy material is   self-compacting.
No serial production possible	Series production easily possible

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